OMB APPROVAL OMB Number: 3235-0578 Expires: April 30, 2010 Estimated average burden hours per response..... 10.5 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM N-Q CERTIFIED SHAREHOLDER REPORT OF REGISTERED MANAGEMENT INVESTMENT COMPANIES Investment Company Act file number 811-21043 Pioneer High Income Trust (Exact name of registrant as specified in charter) 60 State Street, Boston, MA 02109 (Address of principal executive offices) (ZIP code) Dorothy E. Bourassa, Pioneer Investment Management, Inc., 60 State Street, Boston, MA 02109 (Name and address of agent for service) Registrant's telephone number, including area code: (617) 742-7825 Date of fiscal year end: March 31 Date of reporting period: June 30, 2008 Form N-Q is to be used by management investment companies, other than small business investment companies registered on Form N-5 (239.24 and 274.5 of this chapter), to file reports with the Commission, not later than 60 days after close of the first and third fiscal quarters, pursuant to Rule 30b1-5under the Investment Company Act of 1940 (17 CFR 270.30b-5). The Commission may use the information provided on Form N-Q in its regulatory, disclosure review, inspection, and policymaking roles. A registrant is required to disclose the information specified by Form N-Q, and the Commission will make this information public. A registrant is not required to respond to the collection of information contained in Form N-Q unless the Form displays a currently valid Office of Management and Budget ("OMB") control number. Please direct comments concerning the accuracy of the information collection burden estimate and any suggestions for reducing the burden to Secretary, Securities and Exchange Commission, 450 Fifth Street, NW, Washington, DC 20549-0609. The OMB has reviewed this collection of information under the clearance requirements of 44 U.S.C. ss. 3507. ITEM 1. Schedule of Investments. Pioneer High Income Trust SCHEDULE OF Investments 6/30/08 (unaudited) Principal Amount USD ($) Value ($) ASSET BACKED SECURITIES - 2.0% Transportation - 0.3% Airlines - 0.3% 792,554 (m)American Airlines, Inc., 7.379%, 11/23/17 507,235 691,667 Continental Airlines, Inc., Series B, 8.499%, 636,334 Total Transportation 1,143,569 Banks - 0.1% Thrifts & Mortgage Finance - 0.1% 531,443 (a)ACE Securities Corp., 3.083%, 12/25/34 427,506 Total Banks 427,506 Utilities - 1.6% Electric Utilities - 1.1% 4,110,220 Ormat Funding Corp., 8.25%, 12/30/20 4,048,566 Multi - Utilities - 0.5% 2,175,000 (a)Power Contract Financing III LLC, 1.332%, 2/5/11,881,375 Total Utilities 5,929,941 TOTAL ASSET BACKED SECURITIES (Cost $7,815,854) 7,501,016 COLLATERALIZED MORTAGE BACKED SECURITIES - 1.3% Consumer Services - 0.3% Restaurants - 0.3% 1,245,000 DB Master Finance LLC, 8.285%, 6/20/31 (144A) 1,104,589 Total Consumer Services 1,104,589 Banks - 1.0% Thrifts & Mortgage Finance - 1.0% 440,000 (a)Carrington Mortgage Loan Trust, 2.583%, 10/25/3419,118 1,504,000 (a)Carrington Mortgage Loan Trust, 2.683%, 2/25/371,337,702 1,790,514 (a)Luminent Mortgage Trust, 2.743%, 7/25/36 705,236 1,086,021 (a)WaMu Mortgage Pass Through Certificates, 2.713%853,347 3,315,403 Diversified Financials - 0.0% Other Diversified Financial Services - 0.0% 174,192 (a)First Franklin Mortgage Loan Asset Backed Certi165,098 Total Banks 3,480,501 TOTAL COLLATERALIZED MORTGAGE OBLIGATIONS (Cost $4,742,711) 4,585,090 CORPORATE BONDS & NOTES - 114.8% Energy - 14.2% Oil & Gas Drilling - 3.9% 3,924,838 DDI Holding AS, 9.3%, 1/19/12 (144A) 3,905,214 2,500,000 Norse Energy Corp. ASA, 6.5%, 7/14/11 (144A) 2,050,000 NOK 3,000,000 Norse Energy Corp. ASA, 10.0%, 7/13/10 556,597 NOK 11,500,000 Norwegian Energy Co. AS, 11.0%, 7/13/10 (144A) 2,167,490 NOK 11,500,000 Petrojack AS, 11.0%, 4/19/10 2,280,380 3,500,000 Skeie Drilling & Production ASA, 11.25%, 3/8/133,237,500 14,197,181 Oil & Gas Equipment & Services - 1.1% 600,000 (a)DP Producer AS, 8.673%, 12/5/11 (144A) 534,000 1,100,000 Nexus 1 Pte, Ltd., 10.5%, 3/7/12 (144A) 990,000 500,000 (a)PetroProd, Ltd., 8.71%, 1/12/12 (144A) 470,000 2,000,000 Sevan Marine ASA, 9.25%, 12/20/11 (144A) 2,000,000 3,994,000 Oil & Gas Exploration & Production - 6.8% 6,584,000 Baytex Energy, Ltd., 9.625%, 7/15/10 6,715,680 3,200,000 Biofuel Energy ASA, 10.0%, 6/7/12 2,656,000 4,500,000 Methanex Corp., 8.75%, 8/15/12 4,758,750 1,610,000 Parallel Petroleum Corp., 10.25%, 8/1/14 1,614,025 5,300,000 PetroQuest Energy, Inc., 10.375%, 5/15/12 5,512,000 710,000 (a)SandRidge Energy, Inc., 6.323%, 4/1/14 (144A) 696,757 1,070,000 (b)SandRidge Energy, Inc., 8.625%, 4/1/15 (144A) 1,096,750 2,070,000 Tristan Oil, Ltd., 10.5%, 1/1/12 (144A) 2,028,600 25,078,562 Oil & Gas Refining & Marketing - 2.4% 5,075,000 (m)Aventine Renewable Energy Holdings, Inc., 10.0%3,146,500 1,275,000 (a)Ohio Air Quality Development Authority Revenue,828,750 2,370,000 (m)VeraSun Energy Corp., 9.375%, 6/1/17 1,220,550 4,280,000 (m)VeraSun Energy Corp., 9.875%, 12/15/12 3,761,050 8,956,850 Total Energy 52,226,593 Materials - 18.9% Commodity Chemicals - 2.9% 4,635,000 ARCO Chemical Co., 9.8%, 2/1/20 3,684,825 2,000,000 (m)Georgia Gulf Corp., 9.5%, 10/15/14 1,495,000 2,860,000 (m)Georgia Gulf Corp., 10.75%, 10/15/16 1,716,000 3,000,000 Hexion US Finance Corp./Hexion Nova Scotia Fina2,715,000 1,000,000 Invista, 9.25%, 5/1/12 (144A) 1,022,500 10,633,325 Diversified Chemicals - 1.3% 4,750,000 Basell Finance Co., 8.1%, 3/15/27 (144A) 2,850,000 EURO 350,000 Ineos Group Holdings Plc, 7.875%, 2/15/16 (144A357,058 1,500,000 (m)Ineos Group Holdings Plc, 8.5%, 2/15/16 (144A) 986,250 EURO 540,000 Nell AF S.a.r.l., 8.375%, 8/15/15 (144A) 550,890 4,744,198 Specialty Chemicals - 0.5% 2,250,000 Tronox Worldwide LLC, 9.5%, 12/1/12 1,833,750 Construction Materials - 2.0% 4,500,000 AGY Holding Corp., 11.0%, 11/15/14 (144A) 4,196,250 1,500,000 (m)Panolam Industries International, 10.75%, 10/1/1,185,000 2,185,000 U.S. Concrete, Inc., 8.375%, 4/1/14 1,939,188 7,320,438 Paper Packaging - 3.8% 5,450,000 Exopack Holding Corp., 11.25%, 2/1/14 5,054,875 2,255,000 Graham Packaging Co., 9.875%, 10/15/14 1,995,675 5,540,000 (m)Graphic Packaging International, Inc., 9.5%, 8/5,290,700 2,150,000 U.S. Corrugated, Inc., 10.0%, 6/1/13 1,569,500 13,910,750 Aluminum - 1.7% 2,535,000 (m)Aleris International, Inc., 10.0%, 12/15/16 1,856,888 1,200,000 Asia Aluminum Holdings, Ltd., 8.0%, 12/23/11 (11,140,000 3,180,000 Indalex Holding Corp., 11.5%, 2/1/14 1,868,250 705,000 (a)Noranda Aluminum Acquisition Corp., 6.828%, 5/1608,063 800,000 (a)Noranda Aluminum Holdings Corp., 8.578%, 11/15/656,000 6,129,201 Diversified Metals & Mining - 4.3% 3,300,000 American Rock Salt Co. LLC, 9.5%, 3/15/14 3,465,000 3,000,000 FMG Finance Pty., Ltd., 10.625%, 9/1/16 (144A) 3,495,000 2,440,000 Industrias Metalurgicas Pescarmona SA, 11.25%, 2,196,000 3,975,000 PNA Group, Inc., 10.75%, 9/1/16 4,670,625 1,870,000 (a)PNA Intermediate Holding Corp., 9.676%, 2/15/131,860,650 15,687,275 Steel - 2.0% 4,205,000 Algoma Acquisition Corp., 9.875%, 6/15/15 (144A3,994,750 825,000 Blaze Recycling & Metals LLC, 10.875%, 7/15/12 808,500 2,400,000 CSN Islands VIII Corp., 9.75%, 12/16/13 (144A) 2,742,000 7,545,250 Forest Products - 0.4% 1,645,000 Mandra Forestry Holdings, Ltd., 12.0%, 5/15/13 1,529,850 Total Materials 69,334,037 Capital Goods - 7.2% Building Products - 0.5% 2,500,000 (m) Industrias Unidas SA de CV, 11.5%, 11/15/16 (11,625,000 Electrical Components & Equipment - 0.6% 2,220,000 (c)Rede Empresas de Energia Electrica SA, (144A) 2,175,600 Heavy Electrical Equipment - 2.4% 4,790,000 Altra Industrial Motion, 9.0%, 12/1/11 4,885,800 3,975,000 Hawk Corp., 8.75%, 11/1/14 4,029,656 8,915,456 Construction & Farm Machinery & Heavy Truck - 3.7% 4,900,000 (m)Accuride Corp., 8.5%, 2/1/15 3,601,500 1,855,000 (b)Allison Transmission Inc., 11.25%, 11/1/15 (1441,595,300 3,250,000 Commercial Vehicle Group, Inc., 8.0%, 7/1/13 2,819,375 1,500,000 (d)Stanadyne Corp., 0.0%, 2/15/15 1,140,000 4,690,000 Stanadyne Corp., 10.0%, 8/15/14 4,549,300 13,705,475 Total Capital Goods 26,421,531 Commercial Services & Supplies - 6.2% Trading Companies & Distributors - 0.0% 200,000 United Rentals North America, 6.5%, 2/15/12 180,000 Diversified Commercial & Professional Services - 3.4% 3,500,000 Allied Security Escrow, 11.375%, 7/15/11 3,010,000 9,000,000 NCO Group, Inc., 11.875%, 11/15/14 7,380,000 2,515,000 Park-Ohio Industries, Inc., 8.375%, 11/15/14 2,012,000 12,402,000 Environmental & Facilities Services - 2.8% 4,088,000 Clean Harbors, Inc., 11.25%, 7/15/12 4,328,170 5,800,000 Waste Services, Inc., 9.5%, 4/15/14 5,858,000 10,186,170 Total Commercial Services & Supplies 22,768,170 Transportation - 2.1% Air Freight & Logistics - 1.0% 2,000,000 CEVA Group Plc, 10.0%, 9/1/14 (144A) 2,055,000 EURO 1,545,000 CEVA Group Plc, 10.0%, 12/1/16 (144A) 1,722,211 3,777,211 Marine - 0.6% 2,160,000 Trailer Bridge, Inc., 9.25%, 11/15/11 1,992,600 Railroads - 0.5% 1,750,000 Kansas City Southern de Mexico, 9.375%, 5/1/12 1,820,000 Total Transportation 7,589,811 Automobiles & Components - 1.7% Auto Parts & Equipment - 1.7% 5,965,000 (m)Cooper-Standard Automotive, Inc., 8.375%, 12/154,384,275 2,500,000 Lear Corp., 8.75%, 12/1/16 1,950,000 Total Automobiles & Components 6,334,275 Consumer Durables & Apparel - 1.4% Homebuilding - 0.7% 3,060,000 Meritage Homes Corp., 6.25%, 3/15/15 2,448,000 Household Products - 0.7% 2,665,000 Yankee Acquisition Corp., 8.5%, 2/15/15 2,078,700 735,000 (m)Yankee Acquisition Corp., 9.75%, 2/15/17 529,200 2,607,900 Total Consumer Durables & Apparel 5,055,900 Consumer Services - 4.0% Casinos & Gaming - 3.5% 1,650,000 Buffalo Thunder Development Authority, 9.375%, 1,105,500 655,000 FireKeepers Development Authority, 13.875%, 5/1640,263 2,050,000 Fontainebleau Las Vegas Holdings LLC/Fontainebl1,332,500 630,000 Galaxy Entertainment Finance Co., Ltd., 9.875%,611,888 4,500,000 Little Traverse Bay Bands of Odawa Indians, 10.4,207,500 530,000 Mashantucket Western Pequot Tribe, 8.5%, 11/15/467,725 1,585,000 Pokagon Gaming Authority, 10.375%, 6/15/14 (1441,699,913 1,750,000 Shingle Springs Tribal Gaming Authority, 9.375%1,421,875 2,450,000 (m)Trump Entertainment Resorts, Inc., 8.5%, 6/1/151,525,125 13,012,289 Hotels, Resorts & Cruise Lines - 0.5% 2,000,000 (a)HRP Myrtle Beach Operations LLC, 7.383%, 4/1/121,720,000 Total Consumer Services 14,732,289 Media - 6.5% Broadcasting & Cable Television - 3.4% 3,200,000 (m)CCH I Holdings LLC, 11.0%, 10/1/15 2,372,000 1,500,000 (m)CCH II Holdings LLC, 10.25%, 9/15/10 1,447,500 EURO 3,750,000 Kabel Deutschland GMBH, 10.75%, 7/1/14 5,893,532 3,865,000 (b)Univision Communications, 9.75%, 3/15/15 (144A)2,821,450 12,534,482 Publishing - 3.1% 2,508,672 (b)American Achievement Group Holding Corp., 14.752,209,705 4,835,000 Sheridan Acquisition Corp., 10.25%, 8/15/11 4,448,200 1,400,000 TL Acquisitions, Inc., 10.5%, 1/15/15 (144A) 1,211,000 3,700,000 (d)Visant Holding Corp., 0.0%, 12/1/13 3,589,000 11,457,905 Total Media 23,992,387 Retailing - 2.8% Distributors - 1.2% 4,735,000 Intcomex, Inc., 11.75%, 1/15/11 4,237,825 General Mechandise Store - 0.2% 1,000,000 (m)Central Garden & Pet Co., 9.125%, 2/1/13 870,000 Home Improvement Retail - 0.2% 820,000 KAR Holdings, Inc., 10.0%, 5/1/15 (144A) 688,800 Specialty Stores - 1.2% 4,615,000 (m)Sally Holdings LLC, 10.5%, 11/15/16 4,395,787 Total Retailing 10,192,412 Food & Staples Retailing - 0.8% Drug Retail - 0.8% 3,350,000 (m)Duane Reade, Inc., 9.75%, 8/1/11 2,998,250 Total Food & Staples Retailing 2,998,250 Food, Beverage & Tobacco - 3.0% Brewers - 1.9% 5,885,000 Cia Brasileira de Bebida, 10.5%, 12/15/11 6,723,612 Agricultural Products - 0.1% 500,000 Marfrig Overseas, Ltd., 9.625%, 11/16/16 (144A)480,000 Packaged Foods & Meats - 0.8% 775,000 Bertin, Ltd., 10.25%, 10/5/16 (144A) 798,250 2,410,000 Minerva Overseas, Ltd., 9.5%, 2/1/17 (144A) 2,241,300 3,039,550 Tobacco - 0.2% 150,000 Alliance One International, Inc., 8.5%, 5/15/12 141,000 605,000 Alliance One International, Inc., 11.0%, 5/15/ 623,150 764,150 Total Food, Beverage & Tobacco 11,007,312 Health Care Equipment & Services - 8.2% Health Care Equipment & Services - 2.1% 2,875,000 (m)Accellent, Inc., 10.5%, 12/1/13 2,630,625 3,195,000 (m)Angiotech Pharmaceuticals, Inc., 7.75%, 4/1/14 2,364,300 2,570,000 (b)Biomet, Inc., 10.375%, 10/15/17 2,724,200 7,719,125 Health Care Supplies - 1.1% 3,800,000 Hanger Orthopedic Group, Inc., 10.25%, 6/1/14 3,904,500 Health Care Services - 1.6% 2,160,000 AMR HoldCo/Emcare HoldCo, 10.0%, 2/15/15 2,289,600 4,055,000 Rural/Metro Corp., 9.875%, 3/15/15 3,710,325 5,999,925 Health Care Facilities - 1.5% 2,555,000 (b)HCA Inc., 9.625%, 11/15/16 2,631,650 3,725,000 Surgical Care Affiliates, Inc., 10.0%, 7/15/17 2,905,500 5,537,150 Managed Health Care - 1.9% 2,900,000 (a)Medical Services Co., 10.213%, 10/15/11 2,675,250 4,400,000 Multiplan, Inc., 10.375%, 4/15/16 (144A) 4,312,000 6,987,250 Total Health Care Equipment & Services 30,147,950 Pharmaceuticals & Biotechnology & Life Sciences - 2.6% Pharmaceuticals - 2.6% 2,000,000 Phibro Animal Health Corp., 10.0%, 8/1/13 (144A2,020,000 3,000,000 Phibro Animal Health Corp., 13.0%, 8/1/14 (144A3,000,000 4,317,000 Warner Chilcott Corp., 8.75%, 2/1/15 4,381,755 Total Pharmaceuticals & Biotechnology & Life Sc9,401,755 Banks - 0.4% Diversified Banks - 0.4% 1,750,000 (a)ALB Finance BV, 9.375% 1,101,118 400,000 (a)Banco Macro SA, 10.75%, 6/7/12 264,500 Total Banks 1,365,618 Diversified Financials - 4.6% Specialized Finance - 2.2% 7,950,000 GATX Financial Corp., 8.875%, 6/1/09 8,178,666 Consumer Finance - 2.4% 3,770,000 ACE Cash Express, Inc., 10.25%, 10/1/14 (144A) 2,827,500 495,000 (m)AmeriCredit Corp., 8.5%, 7/1/15 396,000 3,000,000 (a)Ford Motor Credit Co., 7.163%, 4/15/12 2,811,726 3,000,000 Ford Motor Credit Co., 7.875%, 6/15/10 2,589,471 8,624,697 Total Diversified Financials 16,803,363 Insurance - 6.3% Insurance Brokers - 1.9% 2,640,000 Alliant Holdings I, Inc., 11.0%, 5/1/15 (144A) 2,296,800 3,765,000 HUB International Holdings, Inc., 10.25%, 6/15/3,087,300 900,000 (a)U.S.I. Holdings Corp., 6.551%, 11/15/14 (144A) 751,500 885,000 U.S.I. Holdings Corp., 9.75%, 5/15/15 (144A) 761,100 6,896,700 Life & Health Insurance - 1.5% 5,725,000 Presidential Life Corp., 7.875%, 2/15/09 5,710,687 Multi-Line Insurance - 2.2% 5,300,000 Allmerica Financial Corp., 7.625%, 10/15/25 4,590,197 2,600,000 (a)Liberty Mutual Group, Inc., 10.75%, 6/15/58 (142,489,500 2,410,000 (a)MBIA Insurance Co., 14.0% 1/15/33 (144A) 1,000,150 8,079,847 Property & Casualty Insurance - 0.1% 375,000 (a)Blue Fin, Ltd., 7.128% 4/10/12 (144A) 369,038 Reinsurance - 0.6% EURO 275,000 (a)Atlas Reinsurance Plc, 14.981%, 1/10/11 (144A) 443,024 750,000 (a)Foundation Re, Ltd.,6.795%, 11/24/08 (144A) 731,925 250,000 (a)Residential Reinsurance 2006, 12.682%, 6/5/09 (248,675 350,000 (a)Residential Reinsurance 2008, 14.149%, 6/6/11 (348,985 500,000 (a)Successor II, Ltd., 27.672%, 4/6/10 (144A) 488,550 2,261,159 Total Insurance 23,317,431 Real Estate - 0.0% Real Estate Management & Development - 0.0% 225,000 (a)Alto Palermo SA, 11.0%, 6/11/12 (144A) 179,719 Total Real Estate 179,719 Software & Services - 5.1% IT Consulting & Other Services - 1.3% 4,450 (e)MSX International UK/MXS International Business Services FR/MXS International GmBH, 12.5%, 4/1/12 (13,426,500 1,705,000 Vangent, Inc., 9.625%, 2/15/15 1,483,350 4,909,850 Data Processing & Outsourced Services - 3.0% 7,015,000 First Data Corp., 9.875%, 9/24/15 (144A) 6,103,050 640,000 iPayment, Inc., 9.75%, 5/15/14 540,800 5,745,000 Pegasus Solutions, Inc., 10.5%, 4/15/15 (144A) 4,308,750 10,952,600 Application Software - 0.8% 2,790,000 Activant Solutions, Inc., 9.5%, 5/1/16 2,204,100 810,000 Open Solutions, Inc., 9.75%, 2/1/15 (144A) 660,150 2,864,250 Total Software & Services 18,726,700 Technology Hardware & Equipment - 3.2% Office Electronics - 3.2% 11,830,000 Xerox Capital Trust I, 8.0%, 2/1/27 11,546,802 Total Technology Hardware & Equipment 11,546,802 Semiconductors & Semiconductor Equipment - 0.6% Semiconductors - 0.6% 2,000,000 (a)Freescale Semiconductor, Inc., 9.125%, 12/15/141,555,000 750,000 (m)Freescale Semiconductor, Inc., 10.125%, 12/15/1571,875 Total Semiconductors & Semiconductor Equipment 2,126,875 Telecommunication Services - 11.6% Integrated Telecommunication Services - 5.0% 4,165,000 Broadview Networks Holdings, Inc., 11.375%, 9/13,738,087 4,070,000 (m)GC Impsat Holdings I Plc, 9.875%, 2/15/17 (144A3,718,962 2,810,000 GCI, Inc., 7.25%, 2/15/14 2,416,600 1,000,000 Intelsat Subsidiary Holdings, 8.5%, 1/15/13 (14975,000 3,565,000 PAETEC Holding Corp., 9.5%, 7/15/15 3,288,712 3,200,000 Stratos Global Corp., 9.875%, 2/15/13 3,384,000 691,000 Tele Norte Leste Participacoes SA, 8.0%, 12/18/714,321 18,235,682 Wireless Telecommunication Services - 6.6% 1,625,000 (m)Cell C Property, Ltd., 11.0%, 7/1/15 (144A) 1,665,625 6,400,000 Cricket Communications, Inc., 9.375%, 11/1/14 6,160,000 1,500,000 Digicel, Ltd., 9.25%, 9/1/12 (144A) 1,543,125 2,500,000 (a)Hellas Telecommunications Luxembourg II, 8.463%1,900,000 5,000,000 Hughes Network Systems LLC, 9.5%, 4/15/14 5,056,250 2,200,000 (d)Inmarsat Finance II Plc, 0.0%, 11/15/12 2,222,000 3,000,000 (a)Rural Cellular Corp., 8.623%, 11/1/12 3,022,500 3,020,000 True Move Co, Ltd., 10.75%, 12/16/13 (144A) 2,631,175 24,200,675 Total Telecommunication Services 42,436,357 Utilities - 3.4% Electric Utilities - 2.1% 2,000,000 Aes Chivor SA ESP, 9.75%, 12/30/14 (144A) 2,276,200 3,800,000 Intergen NV, 9.0%, 6/30/17 (144A) 3,933,000 1,500,000 Mirant JPSCo. Finance, Ltd., 11.0%, 7/6/16 (1441,582,500 7,791,700 Multi - Utilities - 0.1% 485,000 PNM Resources, Inc., 9.25%, 5/15/15 500,763 Independent Power Producers & Energy Traders - 1.2% 4,345,000 Texas Computer Electric Hold LLC, 10.25%, 11/1/4,258,100 Total Utilities 12,550,563 TOTAL CORPORATE BONDS & NOTES (Cost $445,150,899) 421,256,100 CONVERTIBLE BONDS & NOTES - 0.3% of Net Assets Transportation - 0.3% Marine - 0.3% 1,415,000 Horizon Lines, Inc., 4.25%, 8/15/12 1,098,394 TOTAL CONVERTIBLE BONDS & NOTES 1,098,394 (Cost $1,083,449) MUNICIPAL BONDS - 5.9% of Net Assets Indiana - 1.6% 1,650,000 East Chicago Industrial Pollution Control Reven1,688,726 4,250,000 Indiana Development Finance Authority Revenue, 4,301,000 5,989,726 New Jersey - 1.0% 4,525,000 New Jersey Economic Development Authority Reven3,659,051 New York - 0.8% 3,475,000 New York City Industrial Development Agency, Br2,988,639 North Carolina - 1.4% 4,800,000 Charlotte, Special Facilities Revenue, Charlott3,327,024 2,000,000 Charlotte, Special Facilities Revenue, Charlott1,771,500 5,098,524 Texas - 1.1% 3,200,000 (f)San Antonio, Texas, Electric & Gas, RIB,10.343%4,035,424 TOTAL MUNICIPAL BONDS (Cost $19,494,943) 21,771,364 MUNICIPAL COLLATERALIZED DEBT OBLIGATION - 0.9% 3,300,000 (g)Non-Profit Preferred Funding Trust I, 12.5%, 9/3,152,985 TOTAL MUNICIPAL COLLATERALIZED DEBT OBLIGATION (Cost $3,293,400) 3,152,985 SOVEREIGN DEBT OBLIGATIONS - 2.3% Brazil - 1.1% ITL 4,800,000,0(d)Banco Nacional de Desenvolimento Bndes, 8.0%, 44,019,045 Ecuador - 0.5% 2,015,000 (d)Federal Republic of Ecuador, 10.0%, 8/15/30 (141,964,625 Russia - 0.7% 2,285,200 (d)Russia Government International Bond, 7.5%, 3/32,563,743 TOTAL SOVEREIGN DEBT OBLIGATIONS (Cost $5,361,520) 8,547,413 FLOATING RATE LOAN INTERESTS - 5.3% (h) Energy - 0.2% Oil & Gas Exploration & Production - 0.2% 600,000 Venoco, Inc., Second Lien Term Loan, 6.688%, 9/585,000 Total Energy 585,000 Materials - 0.5% Steel - 0.5% 2,277,000 Niagara Corp., Term Loan, 7.386%, 6/29/14 2,026,530 Total Materials 2,026,530 Capital Goods - 1.6% Aerospace & Defense - 0.9% 3,600,000 Aeroflex, Inc., Senior Unsecured Bridge Loan, 63,330,000 Building Products - 0.6% 229,418 Custom Building Products, Inc., First Lien Term200,741 2,250,000 Custom Building Products, Inc., Second Lien Ter1,822,500 2,023,241 Construction & Farm Machinery & Heavy Trucks - 0.1% 397,920 Rental Service Corp., Second Lien Initial Term 339,476 Total Capital Goods 5,692,717 Consumer Durables & Apparel - 0.1% Homebuilding - 0.1% 2,850,000 (i)LandSource Communities Development LLC, Second 534,375 Total Consumer Durables & Apparel 534,375 Consumer Services - 0.5% Casinos & Gaming - 0.5% 2,500,000 Gateway Casinos & Entertainment, Advance Second1,725,000 Total Consumer Services 1,725,000 Health Care Equipment & Services - 0.4% 1,492,424 Talecris Biotherapeutics Holdings Corp., First 1,376,761 Total Health Care Equipment & Services 1,376,761 Diversified Financials - 0.9% Logistics - 0.9% EURO 2,274,035 (b)Louis Topco, Ltd., Term Loan, 12.134%, 6/1/17 3,421,621 Total Diversified Financials 3,421,621 Insurance - 0.5% Insurance Brokers - 0.4% 2,250,000 AmWins Group, Inc., Second Lien Initial Term Lo1,473,750 Multi-Line Insurance - 0.1% 249,372 AmWins Group, Inc., Initial Term Loan 4.98% - 209,472 Total Insurance 1,683,222 Telecommunication Services - 0.6% Integrated Telecommunication Services - 0.6% 2,500,000 Intelsat, Ltd., Senior Notes Backstop Loan, 9.22,337,500 Total Telecommunication Services 2,337,500 TOTAL FLOATING RATE LOAN INTERESTS (Cost $23,541,511) 19,382,726 Shares COMMON STOCKS - 0.3% Transportation - 0.1% Airlines - 0.1% 73,808 (j)Northwest Airlines Corp. 491,561 Total Transportation Pharmaceuticals & Biotechnology & Life Sciences - 0.2% Pharmaceuticals - 0.2% 17,818 Teva Pharmaceutical Industries, Ltd. (A.D.R.) 816,064 Total Pharmaceuticals & Biotechnology & Life Sciences TOTAL COMMON STOCKS (Cost $2,886,220) 1,307,625 WARRANTS - 0.6% of Net Assets Energy - 0.5% Oil & Gas Drilling - 0.5% 2,500,000 (j)Norse Energy Corp. ASA - CW11, Expires 7/14/11 1,791,517 Oil & Gas Exploration & Production - 0.0% 150,592 (j)Biofuel Energy ASA, Expires 6/7/12 0 Total Energy 1,791,517 Materials - 0.1% Forest Products - 0.1% 1,645 (j)Mandra Forestry Holdings, Ltd. - CW13, Expires 213,850 Total Materials 213,850 TOTAL WARRANTS (Cost $523,408) 2,005,367 Principal Amount USD ($) TEMPORARY CASH INVESTMENTS - 19.1% Repurchase Agreement - 5.4% 3,990,000 Bank of America Corp., 2.44%, dated 6/30/08, re3,990,000 plus accrued interest on 7/1/08 collateralized by $10,777,524 Federal National Mortgage Association, 5.5%, 6/1/33 3,990,000 Barclays Plc, 2.4%, dated 6/30/08, repurchase p3,990,000 plus accrued interest on 7/1/08 collateralized by the following: $2,425,677 Federal Home Loan Mortgage Corp., 4.171% - 6.27%, 12/1/34 - 10/1/37 $2,492,527 Federal National Mortgage Association (ARM), 5.024% - 6.082%, 8/1/36 - 2/1/48 3,995,000 Deutsche Bank AG, 2.7%, dated 6/30/08, repurcha3,995,000 plus accrued interest on 7/1/08 collateralized by the following: $944,287 Federal Home Loan Mortgage Corp., 4.703% - 4.704%, 5/1/35 - 12/1/35 $1,245,301 Federal National Mortgage Association (ARM), 4.708% - 5.887%, 12/1/13 - 8/1/37 $3,881,778 Freddie Mac Giant, 4.5% - 7.0%, 10/1/34 - 5/1/38 $7,864,933 U.S. Treasury Strip, 0.0%, 8/15/22 3,990,000 JPMorgan Chase & Co., 2.65%, dated 6/30/08, rep 3,990,000 plus accrued interest on 7/1/08 collateralized by $4,436,742 Federal National Mortgage Association, 4.5% - 6.5%, 3/1/23 - 5/1/38 3,990,000 Merrill Lynch & Co., 2.5%, dated 6/30/08,repurc 3,990,000 plus accrued interest on 7/1/08 collateralized by $4,964,724 Federal Home Loan Mortgage Corp., 5.065% - 5.985%, 9/1/36 - 4/1/38 19,955,000 Security Lending Collateral - 13.7% Certificates of Deposit: 1,027,980 American Express, 2.72%, 8/8/08 1,027,980 277,074 Banco Santander NY, 2.8%, 10/7/08 277,074 770,220 Banco Santander NY, 3.09%, 12/22/08 770,220 1,154,181 Bank Bovespa NY, 2.705%, 8/8/08 1,154,181 769,446 Bank of America, 2.88%, 8/11/08 769,446 769,187 Bank of Nova Scotia, 3.18%, 5/5/09 769,187 461,668 Bank of Scotland NY, 2.7%, 8/1/08 461,668 384,723 Bank of Scotland NY, 2.72%, 8/15/08 384,723 384,723 Bank of Scotland NY, 2.73%, 7/11/08 384,723 276,691 Bank of Scotland NY, 2.89%, 11/4/08 276,691 461,992 Bank of Scotland NY, 2.96%, 11/3/08 461,992 384,469 Bank of Scotland NY, 3.03%, 9/26/08 384,469 1,385,002 Barclay's Bank, 3.18%, 5/27/09 1,385,002 769,446 BNP Paribas NY, 2.88%, 7/23/08 769,446 646,335 Calyon NY, 2.64%, 9/29/08 646,335 244,044 Calyon NY, 2.69%, 1/16/09 244,044 461,675 Calyon NY, 2.85%, 8/25/08 461,675 769,446 Citibank, 2.85%, 7/29/08 769,446 638,640 Commonwealth Bank of Australia NY, 2.63%, 7/11/638,640 646,335 Deutsche Bank Financial, 2.72%, 7/30/08 646,335 307,807 Deutsche Bank Financial, 2.72%, 8/4/08 307,807 153,880 Dexia Bank NY, 2.65%, 8/12/08 153,880 630,949 Dexia Bank NY, 2.69%, 8/7/08 630,949 570,144 Dexia Bank NY, 3.37%, 9/29/08 570,144 1,385,003 DNB NOR Bank ASA NY, 2.9%, 6/8/09 1,385,003 66,096 Fortis, 3.11%, 9/30/08 66,096 1,409,626 Intesa SanPaolo S.p.A., 2.72%, 5/22/09 1,409,626 670,957 Lloyds Bank, 2.61%, 7/11/08 670,957 384,723 Lloyds Bank, 2.61%, 8/18/08 384,723 523,224 Natixis, 2.83%, 8/4/08 523,224 88,907 NORDEA NY, 2.72%, 4/9/09 88,907 73,741 NORDEA NY, 2.73%, 12/1/08 73,741 769,446 NORDEA NY, 2.81%, 8/29/08 769,446 123,085 Rabobank Nederland NY, 2.37%, 8/29/08 123,085 384,723 Royal Bank of Canada NY, 2.57%, 7/15/08 384,723 769,460 Royal Bank of Canada NY, 2.6%, 9/5/08 769,460 297,008 Skandinavian Enskilda Bank NY, 2.7%, 7/17/08 297,008 153,513 Skandinavian Enskilda Bank NY, 3.06%, 2/13/09 153,513 89,188 Skandinavian Enskilda Bank NY, 3.18%, 9/22/08 89,188 638,640 Svenska Bank NY, 2.55%, 7/11/08 638,640 307,780 Svenska Bank NY, 2.7%, 7/17/08 307,780 461,668 Toronto Dominion Bank NY, 2.75%, 11/5/08 461,668 969,502 Toronto Dominion Bank NY, 2.77%, 9/5/08 969,502 153,554 Wachovia Bank, 3.62%, 10/28/08 153,554 24,065,901 Commercial Paper: 146,393 Bank Bovespa NY, 2.79%, 3/12/09 146,393 306,874 Bank of America, 2.6%, 8/11/08 306,874 236,493 Bank of America, 2.7%, 8/26/08 236,493 230,662 CBA, 2.7%, 7/11/08 230,662 613,415 CBA, 2.88%, 8/18/08 613,415 153,803 Deutsche Bank Financial, 2.72%, 7/9/08 153,803 692,344 General Electric Capital Corp., 2.77%, 1/5/09 692,344 769,162 General Electric Capital Corp., 2.82%, 3/16/09 769,162 764,464 HSBC, 2.88%, 9/29/08 764,464 153,644 HSBC, 2.89%, 7/21/08 153,644 284,546 IBM, 3.18%, 2/13/09 284,546 769,446 IBM, 3.18%, 6/26/09 769,446 613,649 ING Funding, 2.7%, 8/13/08 613,649 1,385,003 Met Life Global Funding, 3.16%, 6/12/09 1,385,003 230,669 Natixis, 2.87%, 7/10/08 230,669 230,446 Natixis, 2.87%, 7/21/08 230,446 189,629 PARFIN, 3.18%, 8/1/08 189,629 304,944 Royal Bank of Scotland, 2.66%, 10/21/08 304,944 383,821 Societe Generale, 2.93%, 7/30/08 383,821 153,877 Societe Generale, 2.98%, 7/2/08 153,877 306,908 Societe Generale, 3.18%, 8/5/08 306,908 613,227 Societe Generale, 3.18%, 8/22/08 613,227 306,872 SVSS NY, 3.18%, 8/11/08 306,872 1,308,059 WestPac, 3.18%, 6/1/09 1,308,059 11,148,350 Shares Mutual Funds: 923,336 BlackRock Liquidity Money Market Fund, 3.18% 923,336 1,200,798 Dreyfus Preferred Money Market Fund, 3.18% 1,200,798 2,124,134 Principal Amount USD ($) Tri-party Repurchase Agreements: 3,272,870 Deutsche Bank, 2.5% 7/1/08 3,272,870 9,233,355 Lehman Brothers, 2.65% 7/1/08 9,233,355 12,506,225 Other: 382,655 ABS CFAT 2008-A A1, 3.005%, 4/27/09 382,655 Total Security Lending Collateral 50,227,265 TOTAL TEMPORARY CASH INVESTMENTS (Cost $70,182,265) 70,182,265 TOTAL INVESTMENTS IN SECURITIES - 152.8% (Cost $584,076,180) (k)(l) 560,790,345 OTHER ASSETS AND LIABILITIES - (11.6)% (42,773,873) PREFERRED SHARES AT REDEMPTION VALUE, INCLUDING DIVIDENDS PAYABLE - (41.2)% (151,114,435) NET ASSETS APPLICABLE TO COMMON SHAREOWNERS - 1366,902,037 NR Security not rated by S&P or Moody's. (144A) Security is exempt from registration under Rule 144A of the Securities Act of 1933. Such securities may be resold normally to qualified institutional buyers in a transaction exempt from registration. At June 30, 2008, the value of these securities amounted to $156,091,435 or 42.5% of total net assets applicable to common shareowners. (a) Floating rate note. The rate shown is the coupon rate at June 30, 2008. (b) Payment-in Kind (PIK) security which may pay interest in additional principal amount. (c) Security is a perpetual bond and has no definite maturity date. (d) Debt obligation initially issued at one coupon which converts to a higher coupon at a specific date. The rate shown is the rate at June 30, 2008. (e) Security is priced as a unit. (f) The interest rate is subject to change periodically and inversely based upon prevailing market rates. The rate shown is the rate at June 30, 2008. (g) Indicates a security that has been deemed illiquid. The aggregate cost of illiquid securities is $3,293,400. The aggregate value $3,152,985 represents 0.9% of the net assets. (h) Floating rate loan interests in which the Trust invests generally pay interest at rates that are periodically redetermined by reference to a base lending rate plus a premium. These base lending rates are generally (i) the lending rate offered by one or more major European banks, such as LIBOR (London InterBank Offered Rate), (ii) the prime rate offered by one or more major United States banks, (iii) the certificate of deposit (iv) other base lending rates used by commercial lenders. The interest rate shown is the rate accruing at June 30, 2008. (i) Security is in default and is non-income producing. (ij Non-income producing. (k) At June 30, 2008, the net unrealized loss on investments based on cost for federal income tax purposes of $584,663,625 was as follows: Aggregate gross unrealized gain for all investments in which there is an excess of value over tax cost 21,711,370 Aggregate gross unrealized loss for all investments in which there is an excess of tax cost over value (45,584,650) Net unrealized loss (23,873,280) For financial reporting purposes net unrealized loss was $23,285,835 and cost of investments aggregated $584,076,180. (l) Distribution of investments by country of issue, as a percentage of total holdings, is as follows: United States 76.8% Canada 4.0 Norway 3.8 Brazil 2.7 United Kingdom 2.6 Netherlands 1.4 Cayman Islands 1.3 Germany 1.0 Mexico 1.0 Virgin Islands 0.8 Australia 0.6 Bermuda 0.5 Argentina 0.5 Thailand 0.5 Russia 0.4 Luxembourg 0.4 Colombia 0.4 Ecuador 0.3 South Africa 0.3 Jamaica 0.3 Singapore 0.2 Israel 0.1 Ireland 0.1 100.0 (m) At June 30, 2008, the following securities were out on loan: Principal Amount USD($) Description Market Value($) 1,450,000 Accellent, Inc., 10.5%, 12/1/13 1,139,014 4,820,000 Accuride Corp., 8.5%, 2/1/15 3,700,222 2,500,000 Aleris International, Inc., 10.0%, 12/15/16 1,829,168 792,554 American Airlines, Inc., 7.379%, 11/23/17 245,930 456,000 AmeriCredit Corp., 8.5%, 7/1/15* 384,072 2,500,000 Angiotech Pharmaceuticals, Inc., 7.75%, 4/1/14 1,897,900 1,592,000 Aventine Renewable Energy Holdings, Inc., 10.0%1,018,437 3,168,000 CCH I Holdings LLC, 11.0%, 10/1/15 2,430,471 500,000 CCH II Holdings LLC, 10.25%, 9/15/10 499,948 1,600,000 Cell C Property, Ltd., 11.0%, 7/1/15 (144A) 1,735,510 990,000 Central Garden & Pet Co., 9.125%, 2/1/13 898,689 1,000,000 Cooper-Standard Automotive, Inc., 8.375%, 12/15733,490 3,316,000 Duane Reade, Inc., 9.75%, 8/1/11 3,085,054 492,500 Freescale Semiconductor, Inc., 10.125%, 12/15/1377,609 1,005,000 GC Impsat Holdings I Plc, 9.875%, 2/15/17 (144A954,708 1,803,000 Georgia Gulf Corp., 9.5%, 10/15/14 1,387,935 2,831,000 Georgia Gulf Corp., 10.75%, 10/15/16 1,767,541 5,000,000 Graphic Packaging International, Inc., 9.5%, 8/4,928,125 2,000,000 Industrias Unidas SA de CV, 11.5%, 11/15/16 (141,336,834 1,485,000 Ineos Group Holdings Plc, 8.5%, 2/15/16 (144A) 1,042,284 1,485,000 Panolam Industries International, 10.75%, 10/1/1,211,286 4,568,000 Sally Holdings LLC, 10.5%, 11/15/16 4,422,395 2,420,000 Trump Entertainment Resorts, Inc., 8.5%, 6/1/151,510,920 3,825,000 Univision Communications, 9.75%, 3/15/15 (144A)2,910,588 4,230,000 VeraSun Energy Corp., 9.875%, 12/15/12 3,708,082 2,000,000 VeraSun Energy Corp., 9.375%, 6/1/17 1,035,104 2,638,000 Yankee Acquisition Corp., 8.5%, 2/15/15 2,141,726 Shares 73,000 Northwest Airlines Corp. 460,630 48,793,672 *Awaiting pending sales, portion not part of portfolio at period end. Note: Principal amounts are denominated in U.S. dollars unless otherwise denoted. EURO Euro ITL Italian Lira NOK Norwegian Krone Glossary of Terms: (A.D.R.) American Depositary Receipt RIB Residual Interest Bonds FAS 157 Footnote Disclosures Various inputs are used in determining the value of the Fund's investments. These inputs are summarized in the three broad levels listed below. Highest priority is given to Level 1 inputs and lowest priority is given to Level 3. Level 1 - quoted prices in active markets for identical securities Level 2 - other significant observable inputs (including quoted prices for similar securities, interest rates, prepayment speeds, credit risk, etc.) Level 3 - significant unobservable inputs (including the Fund's own assumptions in determining fair value of investments) The following is a summary of the inputs used as of June 30, 2008, in valuing the Fund's assets: Valuation Inputs Investments in Securities Level 1 - Quoted Prices 3,099,142 Level 2 - Other Significant Observable Inputs 557,691,203 Level 3 - Significant Unobservable Inputs - Total 560,790,345 ITEM 2. CONTROLS AND PROCEDURES. (a) Disclose the conclusions of the registrant's principal executive officer or officers and principal financial officer or officers, or persons performing similar functions, about the effectiveness of the registrant's disclosure controls and procedures (as defined in Rule 30a-3(c) under the Act (17 CFR 270.30a-3(c))) as of a date within 90 days of the filing date of the report that includes the disclosure required by this paragraph, based on their evaluation of these controls and procedures required by Rule 30a-3(b) under the Act (17 CFR270.30a-3(b))) and Rule 13a-15(b) or 15d-15(b) under the Exchange Act (17 CFR240.13a-15(b) or 240.15d-15(b)). The registrant's principal executive officer and principal financial officer have concluded that the registrant's disclosure controls and procedures are effective based on their evaluation of these controls and procedures as of a date within 90 days of the filing date of this report. (b) Disclose any change in the registrant's internal controls over financial reporting (as defined in Rule 30a-3(d) under the Act (17 CFR270.30a-3(d)) that occurred during the registrant's last fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting. There were no significant changes in the registrant's internal control over financial reporting that occurred during the second fiscal quarter of the period covered by this report that have materially affected, or are reasonably likely to materially affect, the registrant's internal control over financial reporting. ITEM 3. EXHIBITS. (a) A separate certification for each principal executive officer and principal financial officer of the registrant as required by Rule 30a-2 under the Act (17 CFR 270.30a-2). Filed herewith. SIGNATURES [See General Instruction F] Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. (Registrant) Pioneer High Income Trust By (Signature and Title)* /s/ John F. Cogan, Jr. John F. Cogan, Jr, President Date August 29, 2008 Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated. By (Signature and Title)* /s/ John F. Cogan, Jr. John F. Cogan, Jr., President Date August 29, 2008 By (Signature and Title)* /s/ Mark Bradley Mark Bradley, Treasurer Date August 29, 2008 * Print the name and title of each signing officer under his or her signature.