UNITEDSTATES
SECURITIESANDEXCHANGECOMMISSION
Washington,D.C.20549

FORM N-Q

QUARTERLY SCHEDULE OF PORTFOLIO HOLDINGS OF REGISTERED
MANAGEMENT INVESTMENT COMPANY

Investment Company Act file number 811-21972

Name of Fund: BlackRock Credit Allocation Income Trust IV (BTZ)

Fund Address: 100 Bellevue Parkway, Wilmington, DE 19809

Name and address of agent for service: Anne F. Ackerley, Chief Executive Officer, BlackRock
Credit Allocation Income Trust IV, 55 East 52 nd Street, New York, NY 10055.

Registrant’s telephone number, including area code: (800) 882-0052, Option 4

Date of fiscal year end: 10/31/2010

Date of reporting period: 07/31/2010

Item 1 – Schedule of Investments



Schedule of Investments July 31, 2010 (Unaudited)

BlackRock Credit Allocation Income Trust IV (BTZ)
(Percentages shown are based on Net Assets)

Common Stocks   Shares   Value  
Commercial Banks — 0.8%      
Citizens Banking Corp. (a)   6,406,596   $ 5,792,844  
Total Common Stocks – 0.8%     5,792,844  
  Par    
Corporate Bonds   (000)    
Aerospace & Defense — 2.7%      
BE Aerospace, Inc., 8.50%,      
7/01/18   $ 3,575   3,887,813  
Bombardier, Inc., 7.75%,      
3/15/20 (b)   4,500   4,848,750  
United Technologies Corp., 5.70%,      
4/15/40   10,000   11,180,590  
    19,917,153  
Airlines — 0.7%      
Continental Airlines Pass-Through      
Certificates, Series 2009-2,      
Class B, 9.25%, 5/10/17   2,225   2,341,812  
Delta Air Lines, Inc., Series 02G1,      
6.72%, 7/02/24   2,461   2,356,274  
    4,698,086  
Auto Components — 0.6%      
Icahn Enterprises LP:      
7.75%, 1/15/16   1,700   1,704,250  
8.00%, 1/15/18   2,500   2,493,750  
    4,198,000  
Beverages — 0.5%      
Constellation Brands, Inc., 7.25%,      
5/15/17   3,230   3,359,200  

 

Building Products — 0.2%      
Building Materials Corp. of      
America, 7.00%, 2/15/20 (b)   1,100   1,108,250  
Capital Markets — 1.8%      
Ameriprise Financial, Inc., 5.30%,      
3/15/20   4,500   4,812,637  
The Goldman Sachs Group, Inc.,      
7.50%, 2/15/19   6,850   7,959,159  
Lehman Brothers Holdings, Inc. (a)(c):      
3.95%, 11/10/09   105   22,313  
4.38%, 11/30/10   325   69,062  
    12,863,171  
Chemicals — 0.3%      
CF Industries, Inc., 7.13%,      
5/01/20   1,850   1,974,875  
Commercial Banks — 0.1%      
Kazkommerts Finance 2 BV,      
9.20% (d)(e)   500   395,000  

 

  Par    
Corporate Bonds   (000)   Value  
Commercial Services &      
Supplies — 2.5%      
Browning-Ferris Industries, Inc.,      
7.40%, 9/15/35   $ 4,420   $ 5,290,974  
Clean Harbors, Inc., 7.63%, 8/15/16   2,500   2,581,250  
Corrections Corp. of America,      
7.75%, 6/01/17   4,835   5,161,363  
Waste Management, Inc., 6.13%,      
11/30/39   4,750   5,085,179  
    18,118,766  
Communications Equipment —      
0.8%      
Brocade Communications Systems,      
Inc., 6.88%, 1/15/20 (b)   3,580   3,660,550  
CC Holdings GS V LLC, 7.75%,      
5/01/17 (b)   1,725   1,884,563  
    5,545,113  
Consumer Finance — 3.0%      
Capital One Bank USA NA, 8.80%,      
7/15/19   3,950   5,028,022  
Inmarsat Finance Plc, 7.38%,      
12/01/17 (b)   2,975   3,049,375  
SLM Corp., 4.00%, 7/25/14 (e)   15,852   13,410,475  
    21,487,872  
Containers & Packaging — 1.1%      
Ball Corp.:      
7.13%, 9/01/16   2,000   2,150,000  
6.75%, 9/15/20   3,575   3,753,750  
Owens-Brockway Glass Container,      
Inc., 6.75%, 12/01/14   1,110   1,129,425  
Rock-Tenn Co., 9.25%, 3/15/16   800   869,000  
    7,902,175  

 

Diversified Financial      
Services — 1.7%      
GMAC, Inc., 8.30%, 2/12/15 (b)   3,700   3,894,250  
ING Groep NV, 5.78% (d)(e)   10,000   8,150,000  
Stan IV Ltd., 2.48%, 7/20/11 (e)   283   240,550  
    12,284,800  
Diversified Telecommunication      
Services — 3.3%      
AT&T Inc., 6.30%, 1/15/38   5,000   5,565,325  
New Communications Holdings,      
Inc., 8.50%, 4/15/20 (b)   4,500   4,803,750  
Qwest Corp., 8.38%, 5/01/16   3,285   3,736,687  
Verizon Communications, Inc.,      
7.35%, 4/01/39   4,700   5,932,796  
Windstream Corp.:      
8.63%, 8/01/16   1,250   1,303,125  
7.88%, 11/01/17   2,700   2,747,250  
    24,088,933  

 

Portfolio Abbreviations

To simplify the listings of portfolio holdings in the Schedule of Investments, the names and descriptions of many of the securities have been abbreviated
according to the following list:

GO

General Obligation Bonds

RB

Revenue Bonds

BLACKROCK CREDIT ALLOCATION INCOME TRUST IV

JULY 31, 2010

1



Schedule of Investments (continued)

BlackRock Credit Allocation Income Trust IV (BTZ)
(Percentages shown are based on Net Assets)

  Par    
Corporate Bonds   (000)   Value  
Electric Utilities — 1.4%      
Progress Energy Inc., 7.00%,      
10/30/31   $ 5,000   $ 6,077,375  
Southern California Edison Co.,      
5.50%, 3/15/40   3,850   4,210,707  
    10,288,082  
Electronic Equipment, Instruments      
& Components — 0.3%      
Jabil Circuit Inc., 8.25%, 3/15/18   2,000   2,180,000  
Energy Equipment &      
Services — 4.8%      
Compagnie Generale de      
Geophysique-Veritas, 7.75%,      
5/15/17   2,500   2,437,500  
Halliburton Co., 7.45%, 9/15/39   13,076   16,664,551  
Hornbeck Offshore Services, Inc.,      
Series B, 6.13%, 12/01/14   2,750   2,468,125  
Transocean, Inc., 6.00%, 3/15/18   14,400   13,473,648  
    35,043,824  
Food & Staples Retailing — 4.4%      
CVS Caremark Corp.:      
4.75%, 5/18/20   10,000   10,412,670  
6.30%, 6/01/62 (e)   7,800   7,176,000  
Wal-Mart Stores, Inc.:      
5.25%, 9/01/35   2,650   2,759,477  
6.20%, 4/15/38   10,000   11,720,850  
    32,068,997  
Food Products — 0.8%      
Kraft Foods, Inc.:      
6.50%, 8/11/17   1,985   2,340,758  
6.13%, 8/23/18   1,990   2,314,336  
Smithfield Foods, Inc., 10.00%,      
7/15/14 (b)   1,250   1,396,875  
    6,051,969  
Gas Utilities — 0.7%      
Nisource Finance Corp., 6.13%,      
3/01/22   4,750   5,228,282  
Health Care Equipment &      
Supplies — 1.9%      
Fresenius US Finance II, Inc.,      
9.00%, 7/15/15 (b)   4,250   4,760,000  
Medtronic, Inc.:      
6.50%, 3/15/39   1,050   1,291,970  
5.55%, 3/15/40   7,058   7,853,712  
    13,905,682  
Health Care Providers &      
Services — 2.7%      
Aetna, Inc., 6.75%, 12/15/37   4,075   4,619,958  
HCA, Inc.:      
8.50%, 4/15/19   2,000   2,210,000  
7.25%, 9/15/20   3,600   3,807,000  
Tenet Healthcare Corp. (b):      
10.00%, 5/01/18   2,175   2,471,344  
8.88%, 7/01/19   1,825   2,007,500  
UnitedHealth Group, Inc., 6.88%,      
2/15/38   4,075   4,729,828  
    19,845,630  

 

  Par    
Corporate Bonds   (000)   Value  
Household Durables — 0.6%      
Cemex Espana Luxembourg,      
9.25%, 5/12/20 (b)   $ 4,947   $ 4,439,933  
IT Services — 0.7%      
International Business Machines      
Corp., 5.60%, 11/30/39   4,400   4,883,569  
Insurance — 3.3%      
Liberty Mutual Group, Inc., 6.70%,      
8/15/16 (b)   1,495   1,559,219  
Lincoln National Corp., 6.25%,      
2/15/20   4,075   4,348,673  
Northwestern Mutual Life      
Insurance, 6.06%, 3/30/40 (b)   5,500   6,126,120  
Principal Financial Group, Inc.,      
8.88%, 5/15/19   1,145   1,430,188  
Prudential Financial, Inc., 6.63%,      
12/01/37   4,075   4,368,718  
QBE Insurance Group Ltd., 9.75%,      
3/14/14 (b)   4,973   6,028,405  
    23,861,323  
Life Sciences Tools &      
Services — 1.5%      
Bio-Rad Laboratories, Inc., 8.00%,      
9/15/16   5,480   5,863,600  
Life Technologies Corp., 6.00%,      
3/01/20   4,800   5,292,034  
    11,155,634  
Machinery — 1.3%      
Ingersoll-Rand Global Holding Co.,      
Ltd., 9.50%, 4/15/14   4,075   5,033,497  
Navistar International Corp.,      
8.25%, 11/01/21   3,975   4,203,563  
    9,237,060  
Media — 6.2%      
CSC Holdings LLC:      
8.50%, 6/15/15   2,300   2,475,375  
8.63%, 2/15/19   1,950   2,130,375  
Comcast Corp., 6.30%, 11/15/17   4,075   4,715,403  
Cox Communications, Inc., 8.38%,      
3/01/39 (b)   4,075   5,459,579  
DISH DBS Corp.:      
7.00%, 10/01/13   1,950   2,028,000  
7.88%, 9/01/19   1,850   1,965,625  
Gannett Co., Inc., 9.38%,      
11/15/17 (b)   3,100   3,363,500  
Intelsat Corp., 9.25%, 6/15/16   2,000   2,135,000  
News America, Inc., 6.15%,      
3/01/37   4,850   5,105,503  
Time Warner Cable, Inc., 6.75%,      
6/15/39   4,675   5,324,231  
Time Warner, Inc., 7.70%,      
5/01/32   4,900   5,987,839  
UPC Germany GmbH, 8.13%,      
12/01/17 (b)   1,225   1,252,562  
Virgin Media Secured Finance Plc,      
6.50%, 1/15/18 (b)   3,175   3,286,125  
    45,229,117  

 

2 BLACKROCK CREDIT ALLOCATION INCOME TRUST IV

JULY 31, 2010



Schedule of Investments (continued)  

 

BlackRock Credit Allocation Income Trust IV (BTZ)
(Percentages shown are based on Net Assets)

    Par    
Corporate Bonds     (000)   Value  
Metals & Mining — 1.3%        
AK Steel Corp., 7.63%, 5/15/20   $ 2,250   $ 2,258,438  
Aleris International, Inc., 10.00%,        
12/15/16 (a)(c)     5,000   2,000  
Phelps Dodge Corp., 7.13%, 11/01/27   3,500   3,790,139  
Teck Resources Ltd., 10.75%, 5/15/19   2,000   2,497,600  
United States Steel Corp., 7.38%,        
4/01/20     550   551,375  
      9,099,552  
Multi-Utilities — 2.6%        
CenterPoint Energy, Inc.:        
5.95%, 2/01/17     3,600   3,900,082  
6.50%, 5/01/18     3,950   4,445,610  
Dominion Resources, Inc., 8.88%,        
1/15/19     8,000   10,665,288  
      19,010,980  
Multiline Retail — 3.1%        
Dollar General Corp., 10.63%, 7/15/15   4,225   4,647,500  
J.C. Penney Co., Inc., 5.65%,        
6/01/20     17,700   17,788,500  
      22,436,000  
Oil, Gas & Consumable        
Fuels — 3.4%        
BP Capital Markets Plc, 3.88%,        
3/10/15     3,085   2,949,133  
Chesapeake Energy Corp., 6.25%,        
1/15/18     2,200   2,249,500  
Enbridge Energy Partners LP,        
9.88%, 3/01/19     2,425   3,259,857  
Enterprise Products Operating LLC,        
6.65%, 4/15/18     4,800   5,567,117  
Kinder Morgan Energy Partners LP,        
6.85%, 2/15/20     4,800   5,686,805  
ONEOK Partners LP, 8.63%,        
3/01/19     4,075   5,223,857  
      24,936,269  
Paper & Forest Products — 2.4%        
Georgia-Pacific LLC, 8.25%,        
5/01/16 (b)     3,955   4,291,175  
International Paper Co.:        
7.50%, 8/15/21     3,950   4,738,452  
8.70%, 6/15/38     3,100   4,080,893  
7.30%, 11/15/39     4,075   4,670,357  
      17,780,877  
Pharmaceuticals — 8.9%        
Abbott Laboratories:        
6.15%, 11/30/37     942   1,110,246  
6.00%, 4/01/39     9,405   10,923,945  
Bristol-Myers Squibb Co.:        
5.88%, 11/15/36     8,015   9,021,139  
6.13%, 5/01/38     2,353   2,747,676  
Eli Lilly & Co., 5.95%, 11/15/37     2,353   2,694,039  
GlaxoSmithKline Capital, Inc.,        
6.38%, 5/15/38     10,100   12,154,815  
Merck & Co., Inc., 6.50%,        
12/01/33     2,885   3,523,592  
Pfizer, Inc., 7.20%, 3/15/39     10,000   13,422,820  
Schering-Plough Corp., 6.55%,        
9/15/37     6,945   8,681,805  
      64,280,077  

 

  Par    
Corporate Bonds   (000)   Value  
Real Estate Investment Trusts      
(REITs) — 1.8%      
AvalonBay Communities, Inc.,      
6.10%, 3/15/20   $ 4,075   $ 4,610,500  
ERP Operating LP:      
5.38%, 8/01/16   3,925   4,261,494  
5.75%, 6/15/17   4,080   4,510,056  
    13,382,050  
Semiconductors & Semiconductor      
Equipment — 3.3%      
Advanced Micro Devices, Inc.,      
7.75%, 8/01/20 (b)(f)   1,300   1,313,000  
KLA-Tencor Corp., 6.90%, 5/01/18   2,208   2,471,041  
National Semiconductor Corp.:      
3.95%, 4/15/15   16,750   17,248,848  
6.60%, 6/15/17   2,770   3,125,372  
    24,158,261  
Specialty Retail — 0.8%      
AutoNation, Inc., 6.75%, 4/15/18   2,775   2,795,812  
AutoZone, Inc., 7.13%, 8/01/18   1,550   1,842,344  
Limited Brands, Inc., 7.00%,      
5/01/20   1,370   1,414,525  
    6,052,681  
Tobacco — 2.9%      
Altria Group, Inc.:      
9.70%, 11/10/18   4,075   5,338,894  
9.25%, 8/06/19   3,950   5,082,180  
10.20%, 2/06/39   7,400   10,451,612  
    20,872,686  
Wireless Telecommunication      
Services — 3.6%      
Cricket Communications, Inc.,      
7.75%, 5/15/16   780   807,300  
Nextel Communications, Inc.,      
Series E, 6.88%, 10/31/13   2,890   2,875,550  
SBA Tower Trust, 5.10%,      
4/15/42 (b)   21,250   22,732,207  
    26,415,057  
Total Corporate Bonds – 84.0%     609,784,986  
Investment Companies   Shares    
ProShares UltraShort Real Estate   30,000   707,400  
Total Investment Companies – 0.1%     707,400  
Preferred Securities      
  Par    
Capital Trusts   (000)    
Capital Markets — 2.8%      
Credit Suisse Guernsey Ltd.,      
5.86% (d)(e)   $ 1,050   955,500  

 

BLACKROCK CREDIT ALLOCATION INCOME TRUST IV

JULY 31, 2010

3



Schedule of Investments (continued)

BlackRock Credit Allocation Income Trust IV (BTZ)
(Percentages shown are based on Net Assets)

  Par    
Capital Trusts   (000)   Value  
Capital Markets — (concluded)      
State Street Capital Trust III,      
8.25% (d)(e)   $ 1,740   $ 1,766,013  
State Street Capital Trust IV,      
1.54%, 6/01/67 (e)   25,245   17,528,790  
    20,250,303  
Commercial Banks — 12.0%      
BB&T Capital Trust IV, 6.82%,      
6/12/77 (e)   15,300   14,764,500  
Barclays Bank Plc (b)(d)(e):      
5.93%   4,000   3,370,000  
6.86%   11,500   9,890,000  
Commonwealth Bank of Australia,      
6.02% (b)(d)(e)   20,000   18,983,320  
HSBC Capital Funding      
LP/Jersey Channel Islands,      
10.18% (b)(d)(e)   7,000   8,715,000  
National City Preferred Capital      
Trust I, 12.00% (d)(e)   3,713   4,126,257  
Shinsei Finance II (Cayman) Ltd.,      
7.16% (b)(d)(e)   1,005   658,903  
Standard Chartered Bank,      
7.01% (b)(d)(e)   5,000   4,710,645  
USB Capital XIII Trust, 6.63%,      
12/15/39   4,100   4,293,848  
Wells Fargo & Co., Series K,      
7.98% (d)(e)   12,985   13,374,550  
Wells Fargo Capital XIII,      
Series GMTN, 7.70% (d)(e)   3,900   3,997,500  
    86,884,523  
Consumer Finance — 0.8%      
Capital One Capital V, 10.25%,      
8/15/39   5,460   5,910,450  
Diversified Financial      
Services — 3.4%      
JPMorgan Chase Capital XXI,      
Series U, 1.42%, 1/15/87 (e)   12,875   9,502,497  
JPMorgan Chase Capital XXIII,      
1.44%, 5/15/77 (e)   20,695   14,808,059  
    24,310,556  
Electric Utilities — 0.5%      
PPL Capital Funding, 6.70%,      
3/30/67 (e)   3,900   3,480,750  
Insurance — 9.3%      
AXA SA, 6.46% (b)(d)(e)   12,000   9,480,000  
Ace Capital Trust II, 9.70%,      
4/01/30   4,000   4,859,744  
The Allstate Corp., 6.50%,      
5/15/67 (e)   4,000   3,660,000  
Aon Corp., 8.21%, 1/01/27   4,000   4,202,000  
Chubb Corp., 6.38%, 3/29/67 (e)   4,000   3,900,000  
Liberty Mutual Group, Inc.,      
10.75%, 6/15/88 (b)(e)   4,000   4,380,000  
Lincoln National Corp., 7.00%,      
5/17/66 (e)   4,255   3,848,222  
MetLife, Inc., 6.40%, 12/15/66   4,550   4,220,125  
Nationwide Life Global Funding I,      
6.75%, 5/15/67   4,000   3,207,600  
Reinsurance Group of America,      
6.75%, 12/15/65 (e)   15,000   12,654,510  

 

  Par    
Capital Trusts   (000)   Value  
Insurance (concluded)      
Swiss Re Capital I LP,      
6.85% (b)(d)(e)   $ 3,000   $ 2,599,098  
The Travelers Cos., Inc., 6.25%,      
3/15/67 (e)   4,000   3,790,956  
White Mountains Re Group Ltd.,      
7.51% (b)(d)(e)   4,400   3,504,160  
ZFS Finance (USA) (b)(e):      
Trust IV, 5.88%, 5/09/32   599   533,038  
Trust V, 6.50%, 5/09/67   3,331   3,031,210  
    67,870,663  
Multi-Utilities — 0.2%      
Puget Sound Energy, Inc., Series A,      
6.97%, 6/01/67 (e)   1,575   1,466,797  
Oil, Gas & Consumable      
Fuels — 1.1%      
Enterprise Products Operating      
LLC, 8.38%, 8/01/66 (e)   4,500   4,584,375  
TransCanada PipeLines Ltd.,      
6.35%, 5/15/67 (e)   4,000   3,640,000  
    8,224,375  
Real Estate Investment Trusts      
(REITs) — 1.5%      
Sovereign Real Estate Investment      
Corp., 12.00% (b)(d)   10   10,950,000  
Total Capital Trusts – 31.6%     229,348,417  
Preferred Stocks   Shares    
Diversified Financial      
Services — 0.8%      
Falcons Funding Trust I, 8.88% (b)   5,650   5,808,906  
Insurance — 2.1%      
Aspen Insurance Holdings Ltd.,      
7.40%   487,487   10,870,960  
Axis Capital Holdings Ltd., Series B,      
7.50%   51,200   4,416,000  
    15,286,960  
Wireless Telecommunication      
Services — 1.4%      
Centaur Funding Corp., 9.08%   10,000   10,575,000  
Total Preferred Stocks – 4.3%     31,670,866  
Trust Preferreds      
Insurance — 0.2%      
W.R. Berkley Capital Trust II,      
6.75%, 7/26/45 (g)   60,755   1,462,087  
Total Trust Preferreds – 0.2%     1,462,087  
Total Preferred Securities – 36.1%     262,481,370  

 

4 BLACKROCK CREDIT ALLOCATION INCOME TRUST IV

JULY 31, 2010



Schedule of Investments (continued)

BlackRock Credit Allocation Income Trust IV (BTZ)
(Percentages shown are based on Net Assets)

    Par    
Taxable Municipal Bonds     (000)   Value  
City of Chicago Illinois, RB, Build        
America Bonds, 6.85%,        
1/01/38   $ 5,000   $ 5,162,350  
Metropolitan Transportation        
Authority, RB, Build America        
Bonds, 6.55%, 11/15/31     4,075   4,195,987  
State of California, GO, Build        
America Bonds, 7.35%,        
11/01/39     2,050   2,151,168  
State of Illinois, GO, Pension,        
5.10%, 6/01/33     4,075   3,323,855  
Total Taxable Municipal Bonds – 2.0%     14,833,360  
U.S. Treasury Obligations        
U.S. Treasury Notes (h):        
1.75%, 7/31/15     60,000   60,440,400  
4.63%, 2/15/40     75,000   83,402,325  
Total U.S. Treasury Obligations – 19.8%     143,842,725  
Total Long-Term Investments        
(Cost – $1,044,380,796) – 142.8%     1,037,442,685  
Short-Term Securities     Shares    
BlackRock Liquidity Funds,        
TempFund, Institutional Class,        
0.23% (i)(j)     2,100,903   2,100,903  
Total Short-Term Securities        
(Cost – $2,100,903) – 0.3%       2,100,903  
Total Investments        
(Cost – $1,046,481,699*) – 143.1%     1,039,543,588  
Preferred Shares at Redemption Value – (31.8)%   (231,064,276)  
Liabilities in Excess of Other Assets – (11.3)%   (82,202,679)  
Net Assets Applicable to Common Shares – 100.0%   $ 726,276,633  
* The cost and unrealized appreciation (depreciation) of investments as  
of July 31, 2010, as computed for federal income tax purposes, were as  
Aggregate follows: cost       $ 1,059,627,737  
Gross unrealized appreciation       $ 45,860,572  
Net Gross unrealized unrealized depreciation depreciation       $ (20,084,149) (65,944,721)  
(a) Non-income producing security.      

 

(b) Security exempt from registration under Rule 144A of the Securities Act  
of 1933. These securities may be resold in transactions exempt from  
registration to qualified institutional investors.    
(c) Issuer filed for bankruptcy and/or is in default of interest payments.  
(d) Security is perpetual in nature and has no stated maturity date.  
(e) Variable rate security. Rate shown is as of report date.    
(f) When-issued security. Unsettled when-issued transactions were as  
follows:      
    Unrealized  
Counterparty   Value   Appreciation  
JPMorgan Securities, Inc.   $ 1,313,000 $   13,000  

 

(g) Convertible security.        
(h) All or a portion of security has been pledged as collateral in connection  
  with open reverse repurchase agreements.      
(i)   Investments in companies considered to be an affiliate of the Fund  
  during the period, for purposes of Section 2(a)(3) of the Investment  
  Company Act of 1940, as amended, are as follows:    
    Shares Held     Shares Held    
    at October   Net   at July 31,    
  Affiliate   31, 2009   Activity   2010   Income  
  BlackRock          
  Liquidity Funds,          
  TempFund,          
  Institutional          
  Class     267,832,781                    (265,731,878)   2,100,903   $170,352  
(j)   Represents the current yield as of report date.      

 

• For Fund compliance purposes, the Fund's industry classifications refer to
any one or more of the industry sub-classifications used by one or more
widely recognized market indexes or rating group indexes, and/or as
defined by Fund management. This definition may not apply for purposes
of this report, which may combine such industry sub-classifications for
reporting ease.

• Reverse repurchase agreements outstanding as of July 31, 2010 were
as follows:

Counter-   Interest   Trade   Maturity   Net Closing   Face  
party   Rate   Date   Date   Amount   Amount  
Credit            
Suisse            
International    0.21%   7/30/10   Open   $60,151,053    $ 60,150,000  
JPMorgan            
Securities,            
Inc.   0.22%   7/30/10     8/02/10         $54,180,993   54,180,000  
Total         $ 114,330,000  

 

• Financial futures contracts purchased as of July 31, 2010 were as follows:

    Expiration   Face   Unrealized  
Contracts   Issue   Date   Value   Appreciation  
357   10-Year U.S.   September      
  Treasury Bonds   2010   $ 43,275,879    $ 925,184  
29   30-Year U.S.   September      
  Treasury Bond   2010   $ 3,607,107   125,736  
Total       $ 1,050,920  

 

  Credit default swaps on single-name issues - buy protection outstanding as of July 31, 2010  
  were as follows:          
        Notional       
    Pay     Amount        Unrealized  
  Issuer   Rate   Counterparty   Expiration                          (000)   Depreciation  
  Nordstrom, Inc.   5.20%   Deutsche Bank AG   June 2014                        $ 4,000    $ (640,819)  

 

BLACKROCK CREDIT ALLOCATION INCOME TRUST IV

JULY 31, 2010

5



Schedule of Investments (concluded)

BlackRock Credit Allocation Income Trust IV (BTZ)

•Fair Value Measurements - Various inputs are used in determining the fair value of investments and
derivatives, which are as follows:

•Level 1 — price quotations in active markets/exchanges for identical assets and liabilities

•Level 2 — other observable inputs (including, but not limited to: quoted prices for similar assets or
liabilities in markets that are active, quoted prices for identical or similar assets or liabilities in
markets that are not active, inputs other than quoted prices that are observable for the assets or
liabilities (such as interest rates, yield curves, volatilities, prepayment speeds, loss severities, credit
risks and default rates) or other market-corroborated inputs)

•Level 3 — unobservable inputs based on the best information available in the circumstances, to the
extent observable inputs are not available (including the Fund's own assumptions used in
determining the fair value of investments and derivatives)

The inputs or methodologies used for valuing securities are not necessarily an indication of the risk
associated with investing in those securities. For information about the Fund's policy regarding valuation
of investments and other significant accounting policies, please refer to the Fund’s most recent financial
statements as contained in its annual report.

The following tables summarize the inputs used as of July 31, 2010 in determining the fair valuation of
the Fund's investments and derivatives:

Valuation Inputs       Level 1   Level 2     Level 3   Total  
Assets:                
Investments in Securities:              
Long-Term Investments:              
Common Stocks     $ 5,792,844         $ 5,792,844  
Corporate Bonds     —         $ 609,544,436   $ 240,550   609,784,986  
Investment Companies     707,400         707,400  
Preferred Securities     12,333,047   250,148,323       262,481,370  
Taxable Municipal Bonds       14,833,360       14,833,360  
U.S. Treasury Obligations       143,842,725       143,842,725  
Short-Term Securities     2,100,903         2,100,903  
Total     $ 20,934,194   $ 1,018,368,844   $ 240,550   $ 1,039,543,588  
      Derivative Financial Instruments 1      
Valuation Inputs   Level 1                    Level 2   Level 3   Total  
Assets:                
Interest rate                
contracts   $ 1,050,920         $ 1,050,920  
Liabilities:                
Credit contracts       —    (640,819)       (640,819)  
Total   $ 1,050,920   $ (640,819)       $ 410,101  

 

1 Derivative financial instruments are financial futures contracts and swaps, which are shown at the
unrealized appreciation/depreciation on the instrument.

The following table is a reconciliation of Level 3 investments for which
significant unobservable inputs were used in determining fair value:

  Corporate  
  Bonds  
Assets:    
Balance, as of October 31, 2009   $ 240,550  
Accrued discounts/premiums   (574)  
Net realized gain (loss)    
Net change in unrealized appreciation/depreciation   574  
Purchases    
Sales    
Transfers in 2    
Transfers out 2    
Balance, as of July 31, 2010   $ 240,550  

 

2 The change in unrealized appreciation/depreciation on securities still held at July 31,
2010 was $574.

6 BLACKROCK CREDIT ALLOCATION INCOME TRUST IV

JULY 31, 2010



Item 2 – Controls and Procedures

2(a) – The registrant's principal executive and principal financial officers or persons performing
similar functions have concluded that the registrant's disclosure controls and procedures (as
defined in Rule 30a-3(c) under the Investment Company Act of 1940, as amended (the
“1940 Act”)) are effective as of a date within 90 days of the filing of this report based on the
evaluation of these controls and procedures required by Rule 30a-3(b) under the 1940 Act
and Rule 13a-15(b) under the Securities Exchange Act of 1934, as amended.

2(b) – There were no changes in the registrant's internal control over financial reporting (as defined
in Rule 30a-3(d) under the 1940 Act) that occurred during the registrant's last fiscal quarter
that have materially affected, or are reasonably likely to materially affect, the registrant's
internal control over financial reporting.

Item 3 – Exhibits

Certifications – Attached hereto

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.

BlackRock Credit Allocation Income Trust IV

By: /s/ Anne F. Ackerley
Anne F. Ackerley
Chief Executive Officer of
BlackRock Credit Allocation Income Trust IV

Date: September 27, 2010

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: /s/ Anne F. Ackerley
Anne F. Ackerley
Chief Executive Officer (principal executive officer) of
BlackRock Credit Allocation Income Trust IV

Date: September 27, 2010

By: /s/ Neal J. Andrews
Neal J. Andrews
Chief Financial Officer (principal financial officer) of
BlackRock Credit Allocation Income Trust IV

Date: September 27, 2010


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