OMB APPROVAL OMB Number: 3235-0578 Expires: May 31, 2007 Estimated average burden hours per response..... 21.09 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: December 31, 2006 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 12/31/06 (unaudited) Principal Amount USD ($) Value ASSET BACKED SECURITIES -0.4% 2,175,000 (aPower Contract Financing III LLC, 2.222% $ 1,726,406 TOTAL ASSET BACKED SECURITIES (Cost $1,742,965) $ 1,726,406 COLLATERIZED MORTGAGE OBLIGATIONS - 0.1% of Net Assets Diversified Financials - 0.1% 425,000 DB Master Finance LLC, 8.285%, 6/20/31 ( $ 432,191 TOTAL COLLATERIZED MORTGAGE OBLIGATIONS (Cost $424,991) $ 432,191 CORPORATE BONDS & NOTES - 118.6% of Net Assets Aerospace - 1.0% 4,500,000 AGY Holding Corp., 11.0%, 11/15/14 (144A $ 4,500,000 Energy - 11.5% Oil & Gas Drilling - 1.5% 4,400,000 DDI Holding AS, 9.3%, 1/19/12 (144A) $ 4,609,000 2,500,000 Norse Energy Corp. ASA, 6.5%, 7/14/11 (1 1,987,500 $ 6,596,500 Oil & Gas Equipment & Services - 1.5% 2,100,000 (aPipe Acquisition Finance Plc, 11.604%, 1 $ 2,147,250 2,380,000 SemGroup L.P., 8.75%, 11/15/15 (144A) 2,391,900 2,000,000 Sevan Marine ASA, 9.25%, 12/20/11 (144A) 2,015,000 $ 6,554,150 Integrated Oil & Gas - 0.2% 815,000 Tristan Oil, Ltd., 10.5%, 1/1/12 (144A) $ 831,300 Oil & Gas Exploration & Production - 8.1% 6,584,000 Baytex Energy, Ltd., 9.625%, 7/15/10 $ 6,863,820 4,080,000 Clayton William Energy, 7.75%, 8/1/13 3,763,800 5,000,000 Energy Partners, Ltd., 8.75%, 8/1/10 5,137,500 1,250,000 Hilcorp Energy I, LP, 9.0%, 6/1/16 (144A 1,321,875 4,500,000 Methanex Corp., 8.75%, 8/15/12 4,893,750 500,000 (aPetroProd, Ltd., 11.364%, 1/12/12 507,500 5,300,000 PetroQuest Energy, Inc., 10.375%, 5/15/1 5,578,250 3,135,000 Stone Energy Corp., 6.75%, 12/15/14 2,993,925 4,280,000 VeraSun Energy Corp., 9.875%, 12/15/12 4,536,800 $ 35,597,220 Oil & Gas Storage & Transportation - 0.2% 820,000 Targa Resources, Inc., 8.5%, 11/1/13 (14 $ 826,150 Total Energy $ 50,405,320 Materials - 26.4% Commodity Chemicals - 3.5% 4,635,000 ARCO Chemical Co., 9.8%, 2/1/20 $ 5,353,425 2,210,000 Georgia Gulf Corp., 9.5%, 10/15/14 (144A 2,154,750 2,650,000 Georgia Gulf Corp., 10.75%, 10/15/16 (14 2,544,000 5,000,000 Invista, 9.25%, 5/1/12 (144A) 5,362,500 $ 15,414,675 Diversified Chemicals - 6.4% 3,200,000 Basell Finance Co., 8.1%, 3/15/27 (144A) $ 3,040,000 2,200,000 Braskem SA, 11.75%, 1/22/14 2,767,600 6,060,000 (bCrystal U.S. Holdings, 0.0%, 10/1/14 5,211,600 3,000,000 Hexion US Finance Corp./Hexion Nova Scot 3,041,250 EURO 3,588,720 Huntsman International LLC, 10.125%, 7/1 4,803,258 2,000,000 Ineos Group Holdings Plc., 8.5%, 2/15/16 1,910,000 EURO 1,190,000 Nell AF S.a.r.l., 8.375%, 8/15/15 (144A) 1,682,963 EURO 3,904,000 Rhodia SA, 9.25%, 6/1/11 5,447,325 $ 27,903,996 Specialty Chemicals - 0.8% 3,300,000 Tronox Worldwide LLC, 9.5%, 12/1/12 $ 3,473,250 Construction Materials - 1.3% 1,500,000 Panolam Industries International, Inc., 1,578,750 4,185,000 U.S. Concrete, Inc., 8.375%, 4/1/14 4,090,838 $ 5,669,588 Metal & Glass Containers - 1.0% 3,985,000 Vitro Envases, 10.75%, 7/23/11 (144A) $ 4,363,575 Paper Packaging - 2.7% 3,085,000 (jGraham Packaging Co., L.P., 9.875%, 10/1 $ 3,115,850 5,540,000 (jGraphic Packaging International, Inc., 9 5,844,700 EURO 2,000,000 MDP Acquisitions Plc, 10.125%, 10/1/12 2,848,289 $ 11,808,839 Aluminum - 1.5% 2,035,000 Aleris International, Inc., 10.0%, 12/15 $ 2,040,087 1,200,000 Asia Aluminum Holdings, Ltd., 8.0%, 12/2 1,197,000 3,180,000 Indalex Holding Corp., 11.5%, 2/1/14 (14 3,323,100 $ 6,560,187 Diversified Metals & Mining - 4.0% 3,300,000 American Rock Salt Co., LLC, 9.5%, 3/15/ $ 3,399,000 3,000,000 FMG Finance Pty., Ltd., 10.625%, 9/1/16 3,217,500 4,600,000 Freeport-McMoRan Copper & Gold, Inc., 10 4,835,750 2,599,000 OM Group, Inc., 9.25%, 12/15/11 2,719,204 3,050,000 PNA Group, Inc., 10.75%, 9/1/16 (144A) 3,152,938 $ 17,324,392 Steel - 1.5% 2,900,000 CSN Islands VIII Corp., 9.75%, 12/16/13 $ 3,285,700 630,000 CSN Islands IX Corp., 10.5%, 1/15/15 (14 733,950 2,485,000 Edgen Acquisition Corp., 9.875%, 2/1/11 2,534,700 $ 6,554,350 Forest Products - 0.3% 1,645,000 Mandra Forestry Holdings, Ltd., 12.0%, 5 $ 1,316,000 Paper Products - 1.3% 5,450,000 Exopack Holding Corp., 11.25%, 2/1/14 (1 $ 5,736,125 Total Materials $ 115,737,477 Capital Goods - 8.3% Building Materials - 0.6% 2,500,000 Industrias Unidas SA de CV, 11.5%, 11/15 $ 2,625,000 Building Products - 1.9% 6,135,000 (aBuilders FirstSource, Inc., 9.624%, 2/15 $ 6,035,306 1,520,000 Esco Corp., 8.625%, 12/15/13 (144A) 1,561,800 875,000 Interline Brands, Inc., 8.125%, 6/15/14 899,062 $ 8,496,168 Heavy Electrical Equipment - 2.0% 4,790,000 Altra Industrial Motion, 9.0%, 12/1/11 $ 4,885,800 3,975,000 Hawk Corp., 8.75%, 11/1/14 3,965,062 $ 8,850,862 Construction & Farm Machinery & Heavy Truck - 3.5% 2,900,000 Accuride Corp., 8.5%, 2/1/15 $ 2,791,250 5,250,000 Commercial Vehicle Group, Inc., 8.0%, 7/ 5,131,875 1,750,000 Greenbrier Companies, Inc., 8.375%, 5/15 1,780,625 1,000,000 (bStanadyne Corp., 0.0%, 2/15/15 680,000 4,690,000 Stanadyne Corp., 10.0%, 8/15/14 4,818,975 $ 15,202,725 Industrial Machinery - 0.3% 1,217,000 Manitowac Co., Inc., 10.5%, 8/1/12 $ 1,306,754 Total Capital Goods $ 36,481,509 Commercial Services & Supplies - 8.7% Diversified Commercial & Professional Services - 5.1% 3,500,000 Allied Security Escrow, 11.375%, 7/15/11 $ 3,587,500 1,850,000 Brickman Group, Ltd., Series B, 11.75%, 1,965,625 EURO 1,500,000 (aFS Funding AS, 10.212%, 5/15/16 (144A) 2,017,538 1,050,000 Mobile Services Group, Inc., 9.75%, 8/1/ 1,097,250 9,000,000 NCO Group, Inc., 11.875%, 11/15/14 (144A 9,112,500 2,195,000 Park-Ohio Industries, Inc., 8.375%, 11/1 2,046,837 2,595,000 (jUnited Rentals North America, Inc., 7.75 2,604,731 $ 22,431,981 Environmental & Facilities Services - 3.6% 4,088,000 Clean Harbors, Inc., 11.25%, 7/15/12 $ 4,550,430 5,020,000 Hydrochem Industrial Services, Inc., 9.2 5,045,100 5,800,000 Waste Services, Inc., 9.5%, 4/15/14 6,046,500 $ 15,642,030 Total Commercial Services & Supplies $ 38,074,011 Transportation - 4.8% Airlines - 0.7% 1,019,764 American Airlines, Inc., 7.379%, 11/23/1 $ 989,171 887,677 Continental Airlines, Inc., Series B, 8. 903,212 1,000,000 GOL Finance, 8.75%, 4/29/49 (144A) 970,000 $ 2,862,383 Marine - 3.6% 600,000 (aDP Producer AS, 11.366%, 12/5/11 (144A) $ 610,500 3,899,000 (bH-Lines Finance Holding, 0.0%, 4/1/13 3,626,070 8,000,000 Seabulk International, Inc., 9.5%, 8/15/ 8,660,000 2,900,000 Trailer Bridge, Inc., 9.25%, 11/15/11 2,990,625 $ 15,887,195 Railroads - 0.5% 2,250,000 Grupo Transportacion Ferroviaria Mexicana, SA de CV, 9.375%, 5/1/12 $ 2,401,875 Total Transportation $ 21,151,453 Automobiles & Components - 1.6% Auto Parts & Equipment - 1.6% 5,965,000 (jCooper-Standard Automotive, Inc., 8.375% $ 4,697,437 2,000,000 UGS Corp., 10.0%, 6/1/12 2,180,000 Total Automobiles & Components $ 6,877,437 Consumer Durable & Apparel - 1.3% Homebuilding - 1.3% 2,000,000 Meritage Homes Corp., 6.25%, 3/15/15 $ 1,900,000 1,100,000 (jWCI Communities, Inc., 7.875%, 10/1/13 984,500 3,200,000 (jWilliam Lyon Homes, Inc., 7.625%, 12/15/ 2,728,000 Total Consumer Durable & Apparel $ 5,612,500 Consumer Services - 4.9% Casinos & Gaming - 4.5% 1,000,000 Buffalo Thunder Development Authority, 9 $ 1,015,000 1,675,000 Galaxy Entertainment Finance Co., Ltd., 1,794,344 4,500,000 Little Traverse Bay Bands of Odawa India 4,522,500 1,700,000 Pokagon Gaming Authority, 10.375%, 6/15/ 1,861,500 3,550,000 Trump Entertainment Resorts, Inc., 8.5%, 3,532,250 6,800,000 Wimar Opco LLC, 9.625%, 12/15/14 (144A) 6,732,000 $ 19,457,594 Hotels, Resorts & Cruise Lines - 0.4% 1,980,000 (aHRP Myrtle Beach Operations LLC, 10.12%, $ 1,980,000 Total Consumer Services $ 21,437,594 Media - 6.0% Broadcasting & Cable TV - 3.0% 2,170,000 Cablemas SA de CV, 9.375%, 11/15/15 (144 $ 2,387,000 3,200,000 CCH I Holdings LLC, 11.0%, 10/1/15 3,284,000 1,500,000 CCH II Holdings LLC, 10.25%, 9/15/10 1,565,625 EURO 3,750,000 Kabel Deutschland GMBH, 10.75%, 7/1/14 5,723,775 $ 12,960,400 Movies & Entertainment - 0.7% 3,000,000 LodgeNet Entertainment Corp., 9.5%, 6/15 $ 3,232,500 Publishing - 2.3% 1,604,643 (cAAC Group Holding Corp., 12.75%, 10/1/12 $ 1,708,945 4,835,000 Sheridan Acquisition Corp., 10.25%, 8/15 5,028,400 3,700,000 (bVisant Holding Corp., 0.0%, 12/1/13 3,265,250 $ 10,002,595 Total Media $ 26,195,495 Retailing - 3.0% Distributors - 1.1% 4,735,000 Intcomex, Inc., 11.75%, 1/15/11 $ 4,687,650 Department Stores - 0.9% 3,800,000 J.C. Penney Co., Inc., 8.125%, 4/1/27 $ 3,907,380 Specialty Retail - 1.0% 4,315,000 Sally Holdings LLC, 10.5%, 11/15/16 (144 $ 4,401,300 Total Retailing $ 12,996,330 Food & Staples Retailing - 2.2% Drug Retail - 0.7% 3,350,000 Duane Reade, Inc., 9.75%, 8/1/11 $ 3,107,125 Food Distributors - 0.7% 3,380,000 Wornick Co., 10.875%, 7/15/11 $ 3,025,100 Food Retail - 0.8% 3,180,000 Nutro Products, Inc., 10.75%, 4/15/14 (1 $ 3,474,150 Total Food & Staples Retailing $ 9,606,375 Food, Beverage & Tobacco - 2.2% Brewers - 1.6% 5,885,000 Cia Brasileira de Bebida, 10.5%, 12/15/1 $ 7,120,850 Agricultural Products - 0.4% 2,000,000 Cosan SA Industria e Comercio, 8.25%, 2/ $ 1,945,000 Packaged Foods & Meats - 0.2% 775,000 Bertin, Ltd., 10.25%, 10/5/16 (144A) $ 817,625 Total Food, Beverage & Tobacco $ 9,883,475 Health Care Equipment & Services - 7.0% Health Care Equipment & Services - 0.7% 2,875,000 Accellent, Inc., 10.5%, 12/1/13 $ 2,982,813 Health Care Supplies - 1.2% 2,000,000 Phibro Animal Health Corp., 10.0%, 8/1/1 2,075,000 3,000,000 Phibro Animal Health Corp., 13.0%, 8/1/1 3,037,500 $ 5,112,500 Health Care Services - 1.5% 2,160,000 AMR HoldCo/Emcare HoldCo, 10.0%, 2/15/15 $ 2,338,200 4,055,000 Rural/Metro Corp., 9.875%, 3/15/15 4,217,200 $ 6,555,400 Health Care Facilities - 2.0% 3,800,000 Hanger Orthopedic Group, Inc., 10.25%, 6 $ 3,923,500 2,555,000 (cHCA, Inc., 10.375%, 11/15/16 (144A) 2,746,625 2,130,000 Psychiatric Solutions, Inc., 7.75%, 7/15 2,124,675 $ 8,794,800 Managed Health Care - 1.6% 2,900,000 (aMedical Services Co., 12.874%, 10/15/11 $ 2,747,750 4,400,000 Multiplan, Inc., 10.375%, 4/15/16 (144A) 4,378,000 $ 7,125,750 Total Health Care Equipment & Services $ 30,571,263 Pharmaceuticals & Biotechnology & Life Sciences - 1.7% Biotechnology - 0.7% 3,500,000 Angiotech Pharmaceuticals, Inc., 7.75%, $ 3,045,000 Pharmaceuticals - 1.0% 4,317,000 Warner Chilcott Corp., 8.75%, 2/1/15 $ 4,424,925 Total Pharmaceuticals & Biotechnology & $ 7,469,925 Diversified Financials - 4.9% Diversified Financial Services - 0.5% EURO 1,545,000 Louis No. 1 Plc, 10.0%, 12/1/16 (144A) $ 2,118,811 Specialized Finance - 1.9% 7,950,000 GATX Financial Corp., 8.875%, 6/1/09 $ 8,536,448 Consumer Finance - 2.5% 4,770,000 ACE Cash Express, Inc., 10.25%, 10/1/14 $ 4,829,625 3,000,000 Ford Motor Credit Co., 7.875%, 6/15/10 3,024,918 3,000,000 (aFord Motor Credit Co., 9.824%, 4/15/12 3,179,220 $ 11,033,763 Total Diversified Financials $ 21,689,022 Insurance - 2.5% Life & Health Insurance - 1.2% 5,725,000 Presidential Life Corp., 7.875%, 2/15/09 $ 5,467,375 Multi-Line Insurance - 1.3% 5,300,000 Allmerica Financial Corp., 7.625%, 10/15 $ 5,679,883 Total Insurance $ 11,147,258 Software & Services - 1.0% Data Processing & Outsourced Services - 0.9% 3,750,000 Compucom Systems, Inc., 12.0%, 11/1/14 ( $ 3,862,500 Data Processing & Outsourced Services - 0.1% 640,000 iPayment, Inc., 9.75%, 5/15/14 $ 657,600 Total Software & Services $ 4,520,100 Technology Hardware & Equipment - 2.7% Office Electronics - 2.7% 11,830,000 Xerox Capital Trust I, 8.0%, 2/1/27 $ 12,081,388 Total Technology Hardware & Equipment $ 12,081,388 Semiconductors & Semiconductor Equipment - 0.5% Semiconductors - 0.5% 2,300,000 (aFreescale Semiconductor, Inc., 9.244%, 1 $ 2,279,875 Total Semiconductors & Semiconductor Equ $ 2,279,875 Telecommunication Services - 16.3% Integrated Telecommunication Services - 2.7% 7,149,000 Eschelon Operating Co., 8.375%, 3/15/10 $ 6,898,785 4,025,000 GCI, Inc., 7.25%, 2/15/14 3,994,812 691,000 Tele Norte Leste Participacoes SA, 8.0%, 734,188 $ 11,627,785 Wireless Telecommunication Services - 13.6% 3,100,000 Broadview Networks Holdings, Inc., 11.37 $ 3,231,750 1,625,000 Cell C Property, Ltd., 11.0%, 7/1/15 (14 1,523,437 2,855,000 (aCleveland Unlimited, Inc., 13.61%, 12/15 3,083,400 6,900,000 Cricket Communications, Inc., 9.375%, 11 7,279,500 1,500,000 Digicel, Ltd., 9.25%, 9/1/12 (144A) 1,601,250 2,500,000 (aHellas Telecommunications Luxembourg II, 2,509,375 3,900,000 Horizon PCS, Inc., 11.375%, 7/15/12 4,348,500 5,000,000 Hughes Network Systems LLC/HNS Finance C 5,218,750 2,200,000 (bInmarsat Finance II Plc, 0.0%, 11/15/12 2,026,750 3,200,000 (bIntelsat Intermediate Holding Co., Ltd., 2,432,000 5,150,000 Mobifon Holdings BV, 12.5%, 7/31/10 5,690,822 1,975,000 (bMobile Satellite Venture, 0.0%, 4/1/13 ( 1,323,250 3,230,000 Mobile Telesystems, 9.75%, 1/30/08 (144A 3,343,050 3,000,000 (aRural Cellular Corp., 11.121%, 11/1/12 3,127,500 4,200,000 Stratos Global Corp., 9.875%, 2/15/13 4,053,000 3,020,000 True Move Co, Ltd., 10.75%, 12/16/13 (14 2,952,050 5,525,000 UbiquiTel Operating Co., 9.875%, 3/1/11 5,967,000 $ 59,711,384 Total Telecommunication Services $ 71,339,169 Utilities - 1.9% Electric Utilities - 1.9% 2,000,000 Aes Chivor SA ESP, 9.75%, 12/30/14 (144A $ 2,280,000 1,500,000 Mirant JPSCo. Finance, Ltd., 11.0%, 7/6/ 1,537,500 4,561,339 Ormat Funding Corp., 8.25%, 12/30/20 4,652,566 Total Utilities $ 8,470,066 TOTAL CORPORATE BONDS & NOTES (Cost $489,534,019) $ 520,640,948 CONVERTIBLE BONDS & NOTES - 1.3% of Net Assets Capital Goods - 0.9% Electrical Components & Equipment - 0.9% 4,000,000 SCI Systems, Inc., 3.0%, 3/15/07 $ 3,975,000 Total Capital Goods $ 3,975,000 Software & Services - 0.4% Systems Software - 0.4% 1,400,000 Macrovision Corp., 2.625%, 8/15/11 (144A $ 1,694,000 Total Software & Services $ 1,694,000 TOTAL CONVERTIBLE BONDS & NOTES (Cost $5,347,776) $ 5,669,000 MUNICIPAL BONDS - 8.3% of Net Assets Indiana - 2.1% 1,650,000 East Chicago Industrial Pollution Ctl. R $ 1,748,554 3,000,000 East Chicago Industrial Pollution Ctl. R 3,027,090 4,250,000 Indiana Dev. Fin. Auth. Rev., 5.75%, 10/ 4,410,353 $ 9,185,997 Michigan - 0.5% 3,000,000 (dWayne Charter County, Spl. Arpt. Facs. R $ 2,444,370 New Jersey - 2.2% 4,525,000 New Jersey Economic Dev. Auth. Rev., 7.0 $ 4,841,162 4,000,000 Tobacco Settlement Financing Corp., 7.0% 4,638,200 $ 9,479,362 New York - 0.9% 3,475,000 New York City Ind. Dev. Agcy., British A $ 3,901,660 North Carolina - 1.6% 4,800,000 Charlotte, Spl. Facs. Rev., Charlotte/Do $ 4,852,080 2,000,000 Charlotte, Spl. Facs. Rev., Charlotte/Do 2,137,320 $ 6,989,400 Texas - 1.0% 3,200,000 (eSan Antonio, Texas, Electric & Gas, RIB, $ 4,308,192 TOTAL MUNICIPAL BONDS (Cost $27,887,839) $ 36,308,981 SOVEREIGN DEBT OBLIGATIONS - 2.0% of Net Assets Brazil - 0.8% ITL 4,800,000,000(bBanco Nacional de Desenvolimento Bndes, $ 3,602,354 Ecuador - 0.6% 3,515,000 (bFederal Republic of Ecuador, 10.0%, 8/15 $ 2,601,100 Russia - 0.6% 2,320,000 (bRussian Federation, 5.0%, 3/31/30 $ 2,619,048 TOTAL SOVEREIGN DEBT OBLIGATIONS (Cost $6,100,205) $ 8,822,502 SENIOR SECURED FLOATING RATE LOAN INTERESTS - 0.1% of Net Assets(f) Capital Goods - 0.1% Construction & Farm Machinery & Heavy Truck - 0.1% 500,000 Rental Service Corp., Second Lien Term L $ 502,917 Total Capital Goods $ 502,917 TOTAL SENIOR SECURED FLOATING RATE LOAN INTERESTS (Cost $500,000) $ 502,917 Shares COMMON STOCKS - 0.1% of Net Assets Pharmaceuticals & Biotechnology & Life Sciences - 0.1% Pharmaceuticals - 0.1% 17,818 Teva Pharmaceutical Industries, Ltd. $ 553,783 Total Pharmaceuticals & Biotechnology & $ 553,783 TOTAL COMMON STOCKS (Cost $752,276) $ 553,783 WARRANTS - 0.1% of Net Assets (g) Materials - 0.0% Forest Products - 0.0% 1,645 Mandra Forestry Holdings, Ltd. - CW13, E $ - Total Materials $ - Energy - 0.1% Oil & Gas Drilling - 0.1% NOK 2,500,000 Norse Energy Corp. ASA - CW11, Expires 7 $ 562,127 Total Energy $ 562,127 Transportation - 0.0% Railroads - 0.0% 4,525 Atlantic Express Transportation Corp., E $ 9,050 Total Transportation $ 9,050 TOTAL WARRANTS (Cost $523,408) $ 571,177 Principal Amount USD ($) TEMPORARY CASH INVESTMENTS - 3.6% of Net Assets Repurchase Agreement - 0.5% 2,200,000 JPMorgan Chase & Co., 4.75%, dated 12/29/06, repurchase price of $2,200,000 plus accrued interest on 1/2/07 collateralized by $2,226,000 U.S. Treasury Notes, 4.625%, 3/31/08 $ 2,200,000 Shares Security Lending Collateral - 3.1% 13,387,897 Securities Lending Investment Fund, 5.26 $ 13,387,897 TOTAL TEMPORARY CASH INVESTMENTS (Cost $15,587,897) $ 15,587,897 TOTAL INVESTMENTS IN SECURITIES - 134.2% (Cost $546,658,411) (h) (i) $ 589,089,396 OTHER ASSETS AND LIABILITIES - 0.2% $ 916,517 PREFERRED SHARES AT REDEMPTION VALUE, INCLUDING DIVIDENDS PAYABLE - (34.4)% $ (151,096,775) NET ASSETS APPLICABLE TO COMMON SHAREOWNERS - 100.0% $ 438,909,138 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 December 31, 2006, the value of these securities amounted to $194,079,657 or 44.2% of total net assets applicable to common shareowners. (a) Floating rate note. The rate shown is the rate at December 31, 2006. (b) Debt obligation initially issued at one coupon which converts to a higher coupon at a specific date. The rate shown is the rate at December 31, 2006. (c) Represents a pay-in-kind security which may pay interest in additional principal. (d) Security is in default and is non-income producing. (e) The interest rate is subject to change periodically and inversely based upon prevailing market rates. The rate shown is the rate at December 31, 2006. (f) Senior secured 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 or (iv) other base lending rates used by commercial lenders. The rate shown is the coupon rate at December 31, 2006. (g) Non-income producing. (h) At December 31, 2006, the net unrealized gain on investments based on cost for federal income tax purposes of $547,002,455 was as follows: Aggregate gross unrealized gain for all investments in which there is an excess of value over tax cos $ 44,928,881 Aggregate gross unrealized loss for all investments in which there is an excess of tax cost over valu (2,841,940) Net unrealized gain $ 42,086,941 For financial reporting purposes net unrealized gain was $42,430,985 and cost of investments aggregated $546,658,411. (j) At December 31, 2006, the following securities were out on loan: Principal Market Amount Description Value 5,905,350 Cooper-Standard Automotive, Inc., 8.375% $ 4,650,463 3,054,150 Graham Packaging Co., L.P., 9.875%, 10/1 3,084,692 1,564,000 Graphic Packaging International, Inc., 9 1,650,020 0 William Lyon Homes, Inc., 7.625%, 12/15/ - 8,000 United Rentals North America, Inc., 7.75 6,820 1,089,000 WCI Communities, Inc., 7.875%, 10/1/13 974,655 2,569,050 William Lyon Homes, Inc., 7.625%, 12/15/ 2,578,684 $ 12,945,334 Note: Principal amounts are denominated in U.S. dollars unless otherwise denoted. EURO Euro ITL Italian Lira NOK Norwegian Krone RIB Residual Interest Bonds 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 March 1, 2007 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 March 1, 2007 By (Signature and Title)* /s/ Vincent Nave Vincent Nave, Treasurer Date March 1, 2007 * Print the name and title of each signing officer under his or her signature.