This is the accessible text file for GAO report number GAO-09-91R 
entitled 'Applying Agreed-Upon Procedures: Fiscal Year 2008 Highway 
Trust Fund Excise Taxes' which was released on November 3, 2008. 

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November 3, 2008: 

The Honorable Calvin L. Scovel III: Inspector General:
Department of Transportation: 

Subject: Applying Agreed-Upon Procedures: Fiscal Year 2008 Highway 
Trust Fund Excise Taxes: 

Dear Mr. Scovel: 

We have performed the procedures described in the enclosure to this 
letter, which we agreed to perform and with which you concurred, solely 
to assist your office in ascertaining whether the net excise tax 
revenue distributed to the Highway Trust Fund (HTF) for the fiscal year 
ended September 30, 2008, is supported by the underlying records. As 
agreed with your office, we evaluated fiscal year 2008 activity 
affecting distributions to the HTF. 

We conducted the engagement in accordance with U.S. generally accepted 
government auditing standards, which incorporate financial audit and 
attestation standards established by the American Institute of 
Certified Public Accountants. You are responsible for the adequacy of 
these agreed-upon procedures to meet your objectives, and we make no 
representation in that respect. The procedures we agreed to perform 
were related to (1) transactions that represent the underlying basis of 
amounts distributed to the HTF during fiscal year 2008, (2) the 
Internal Revenue Service's (IRS) quarterly HTF receipt certifications 
during fiscal year 2008, (3) the Department of the Treasury's Financial 
Management Service adjustments to the HTF during fiscal year 2008, (4) 
the Department of the Treasury's Office of Tax Analysis's (OTA) process 
for estimating excise tax amounts to be distributed to the HTF for the 
fourth quarter of fiscal year 2008, (5) adjustments to the HTF for tax 
on kerosene used in aviation during fiscal year 2008, and (6) the 
amount of net excise taxes distributed to the HTF during fiscal year 
2008. The enclosure provides more detail on the agreed-upon procedures 
and our results. 

We were not engaged to perform, and did not perform, an examination, 
the objective of which would have been to express an opinion on the 
amount of net excise taxes distributed to the HTF during fiscal year 
2008. Accordingly, we do not express such an opinion. Had we performed 
additional procedures, other matters might have come to our attention 
that we would have reported to you. We completed the agreed-upon 
procedures on October 27, 2008. 

We provided a draft of this letter, along with the enclosure, to IRS 
and OTA officials for review and comment. IRS agreed with the results 
and findings presented in the enclosure. OTA agreed with the results 
and findings presented in the enclosure relating to its 
responsibilities, that is, the procedures performed in the estimation 
process for the quarter ended September 30, 2008. 

This report is intended solely for the use of the Office of Inspector 
General of the Department of Transportation and should not be used by 
those who have not agreed to the procedures or have not taken 
responsibility for the sufficiency of the procedures for their 
purposes. However, the report is a matter of public record, and its 
distribution is not limited; thus, we will post the report on our Web 
site at [hyperlink, http://www.gao.gov] and provide copies upon 
request. 

If you have any questions, please call me at (202) 512-3406. Contact 
points for our Offices of Congressional Relations and Public Affairs 
may be found on the last page of this report. 

Sincerely yours, 

Signed by: 

Steven J. Sebastian: 
Director: 
Financial Management and Assurance: 

Enclosure: 

[End of section] 

Enclosure: 

Highway Trust Fund Excise Tax Procedures and Results: 

I. Procedures on transactions that represent the underlying basis of 
amounts distributed to the Highway Trust Fund (HTF) in fiscal year 
2008: 

A. Nonstatistical selection of tax returns from the quarters ended June 
30, 2007[Footnote 1], and September 30, 20[Footnote 2]07: 

1. For each of the quarters ending June 30, 2007, and September 30, 
2007, select the 30 largest excise tax returns containing excise taxes 
related primarily to the HTF and the Airport and Airway Trust Fund 
(AATF) on the basis of total tax liability amount[Footnote 3] from the 
Internal Revenue Service's (IRS) master file.[Footnote 4] 

Description of findings and results: 

We selected the 30 largest excise tax returns related primarily to the 
HTF and the AATF from each of the two quarters for testing. The 
selection was based on the total tax liability amount and type of taxes 
owed for each return from IRS's master file. 

The total tax liability amount related to the 30 returns from the 
quarter ended June 30, 2007, was approximately $10 billion or 71 
percent of the total tax liability amount of $14.1 billion for all 
excise tax returns for the quarter. Of these 30 returns, 20 contained 
primarily HTF-related taxes and 10 contained primarily AATF taxes. 

The total tax liability amount related to the 30 returns from the 
quarter ended September 30, 2007, was approximately $9.9 billion or 71 
percent of the total tax liability amount of $14 billion for all excise 
tax returns for the quarter. Of these 30 returns, 20 contained 
primarily HTF-related taxes and 10 contained primarily AATF taxes. 

2. For each of the 40 returns related primarily to the HTF from the 
quarters ended June 30, 2007, and September 30, 2007, we performed the 
following procedures, which encompassed approximately $14.7 billion in 
prorated collections[Footnote 5] affecting fiscal year 2008 
distributions to the HTF: 

(a) Compare the assessment amounts for abstracts[Footnote 6] 60 and 62 
from the tax return to IRS's master file for agreement. 

Description of findings and results: 

The assessment amounts for abstracts 60 and 62 on the tax return agreed 
with the master file for all 40 returns. 

(b) Calculate the assessment amounts on the tax return for the selected 
abstracts to determine whether they are mathematically correct. 

Description of findings and results: 

The assessment amounts for the selected abstracts were mathematically 
correct on all 40 returns. 

(c) Calculate the prorated collection amount for the selected abstracts 
based on information from the master file and compare this amount to 
the amount in the Collection Certification System audit files[Footnote 
7] for agreement. 

Description of findings and results: 

The independently calculated prorated collection amounts for the 
selected abstracts agreed with amounts in the Collection Certification 
System audit files for all 40 returns. 

B. Statistical selection of attribute and monetary unit samples (MUS) 
from the quarters ended December 31, 2007, and March 31, 2008: 

1. Sampling and other procedures: 

(a) Compare excise tax collections from the master file with excise tax 
collections from the Collection Certification System audit files for 
the first two quarters of fiscal year 2008 to determine if they 
materially agree.[Footnote 8] 

Description of findings and results: 

Excise tax collections from the master file materially agreed with the 
Collection Certification System for the first two quarters of fiscal 
year 2008. 

(b) Compare excise tax collections from the master file with excise tax 
collections from IRS's general ledger for the first 9 months of fiscal 
year 2008 to determine if they materially agree.[Footnote 9] 

Description of findings and results: 

Excise tax collections from the master file materially agreed with 
IRS's general ledger for the first 9 months of fiscal year 2008. 

(c) Select a random attribute sample of 78 excise tax returns from the 
master file.[Footnote 10] Compare assessment and receipt information 
for each return from the master file to the Collection Certification 
System. 

Description of findings and results: 

For all 78 returns, assessment and receipt information from the master 
file was contained in the Collection Certification System. 

(d) Sum the prorated collections for selected abstracts[Footnote 11] 
from the audit files and compare these amounts to amounts in the Report 
of Excise Tax Collection[Footnote 12] to determine if the Collection 
Certification System properly summarized the prorated collections. 

Description of findings and results: 

The Collection Certification System properly summarized the prorated 
collections for all of the selected abstracts. Prorated collections 
from the audit files for the selected abstracts agreed with the 
corresponding amounts in the Report of Excise Tax Collection. 

(e) Separate the total population of prorated collections from the 
audit files into the following distinct populations: (1) HTF, (2) AATF, 
and (3) other excise tax abstracts. Use MUS to select a sample of 
prorated excise tax collections from the HTF population using a 
confidence level of 80 percent, a tolerable misstatement of $391 
million, and an expected aggregate error amount of $117 million. 

Description of findings and results: 

Use of MUS with a confidence level of 80 percent, a tolerable 
misstatement of $391 million, and an expected aggregate error amount of 
$117 million resulted in a sample of 91[Footnote 13] prorated 
collections for the HTF for the first two quarters of fiscal year 2008. 

(f) Select samples of prorated excise tax collections from the two non-
HTF populations. Use MUS to select a sample of prorated excise tax 
collections from the AATF population using a confidence level of 80 
percent, a tolerable misstatement of $119 million, and an expected 
aggregate error amount of $36 million. Select a random attribute sample 
of 45 items from the population of prorated tax collections related to 
all excise taxes other than the HTF and the AATF.[Footnote 14] 

Description of findings and results: 

Use of MUS with a confidence level of 80 percent, a tolerable 
misstatement of $119 million, and an expected aggregate error amount of 
$36 million resulted in a sample of 65[Footnote 15] prorated 
collections for the AATF for the first two quarters of fiscal year 
2008. 

A random attribute sample of 45 items was selected from the population 
of prorated tax collections related to all excise taxes other than the 
HTF and the AATF. 

2. Procedures on transactions: 

(a) For each prorated excise tax collection sampled from the HTF 
population: 

* Compare the assessment amount for the sampled item from the tax 
return to IRS's master file for agreement. 

Description of findings and results: 

The assessment amount on the tax return agreed with the master file for 
all of the sampled items. 

* Calculate the assessment amount on the tax return for the sampled 
item to determine whether it is mathematically correct. 

Description of findings and results: 

The assessment amount on the tax return was mathematically correct for 
all of the sampled items. 

* Calculate the prorated collection amount for the sampled item based 
on information from the master file and compare this amount to the 
amount in the Collection Certification System audit files for 
agreement.[Footnote 16] 

Description of findings and results: 

The independently calculated prorated collection amount agreed with the 
amount in the Collection Certification System audit files for all of 
the sampled items. 

(b) Inspect the tax returns and master file information for the two 
samples of prorated collections from the non-HTF populations to 
determine if they contain any HTF excise tax collections. 

Description of findings and results: 

The two samples of prorated collections from the non-HTF populations 
did not contain any HTF excise tax collections. 

(c) Evaluate the results of conducting steps (a) and (b). 

Description of findings and results: 

For the first two quarters of fiscal year 2008, the net most likely 
error is $0 with an upper error limit of $234 million at the 80 percent 
confidence level. 

II. Procedures on IRS's quarterly HTF receipt certifications: 

Perform the following procedures on IRS's HTF receipt certifications 
for the quarters ended September 30, 2007, December 31, 2007, March 31, 
2008, and June 30, 2008: 

A. Inspect the certification letters[Footnote 17] for authorizing 
signatures. 

Description of findings and results: 

The certification letters for all four quarters had authorizing 
signatures. 

B. Inspect the certification letters and supporting worksheets to 
determine if evidence exists that they were reviewed by the supervisor 
or another analyst. 

Description of findings and results: 

There was evidence that the supervisor or another analyst reviewed the 
certification letters and supporting worksheets for all four quarters. 

C. Calculate the totals on the certification letters to determine if 
they are mathematically correct. 

Description of findings and results: 

The totals on the certification letters for all four quarters were 
mathematically correct. 

D. Trace the certified amounts for diesel fuel tax (abstract 60) and 
gasoline tax (abstract 62)[Footnote 18] from the certification letters 
back to the Report of Excise Tax Collection[Footnote 19] and the 
Treasury 90 Report[Footnote 20] for agreement. 

Description of findings and results: 

The certified amounts for diesel fuel tax (abstract 60) and gasoline 
tax (abstract 62) from the certification letters agreed with the 
related Report of Excise Tax Collection and the Treasury 90 Report for 
all four quarters. 

E. Compare the distribution rates used by IRS for diesel fuel tax 
(abstract 60) and gasoline tax (abstract 62) for agreement with the 
applicable laws. 

Description of findings and results: 

The distribution rates used by IRS for diesel fuel tax (abstract 60) 
and gasoline tax (abstract 62) agreed with the applicable laws in 
effect during all four quarters. 

F. Inspect the Report of Excise Tax Collection used in the 
certification to determine if it contains significant[Footnote 21] 
collections from prior quarters. 

Description of findings and results: 

The Report of Excise Tax Collection used in the certification for all 
four quarters did not contain significant collections from prior 
quarters. 

G. Trace heavy vehicle use tax amounts from the Highway Account 
certification letters to the master file and Treasury 90 
Report.[Footnote 22] 

Description of findings and results: 

The heavy vehicle use tax amounts from the Highway Account 
certification letters agreed with the master file and Treasury 90 
Report for the quarters ended September 30, 2007, and June 30, 2008. 
For the quarters ended December 31, 2007, and March 31, 2008, the heavy 
vehicle use tax amounts from the Highway Account certification letters 
agreed with the master file but not with the Treasury 90 Report. The 
heavy vehicle use tax amounts from the Highway Account certification 
letters for both quarters were not reduced for related credits totaling 
approximately $3.5 million from the Treasury 90 Report. As a result, 
IRS overstated certified receipts to the Highway Account for the 
quarters ended December 31, 2007, and March 31, 2008, by approximately 
$3.5 million. After we brought this to the attention of IRS officials, 
IRS corrected the errors in a revised certification to the Highway 
Account for the quarter ended March 31, 2008. Since the corrections 
were made prior to the end of the fiscal year, the errors did not have 
an effect on fiscal year 2008 distributions to the HTF. 

III. Procedures on Financial Management Service adjustments: 

Perform the following procedures on Financial Management Service (FMS) 
adjustments to HTF excise tax distributions for the quarters ended 
September 30, 2007, December 31, 2007, March 31, 2008, and June 30, 
2008: 

A. Calculate the FMS adjustment amounts based on the Office of Tax 
Analysis (OTA) transfer form[Footnote 23]s and IRS certification 
letters to determine if they are mathematically correct. 

Description of findings and results: 

The FMS adjustment amounts for all four quarters were mathematically 
correct. For the Highway Account, the adjustment amounts were[Footnote 
24]: 

* ($46,681,000) for the quarter ended September 30, 2007; 

* ($782,653,000) for the quarter ended December 31, 2007; 

* ($631,189,000) for the quarter ended March 31, 2008; and: 

* ($152,952,000) for the quarter ended June 30, 2008. 

For the Mass Transit Account, the adjustment amounts were: 

* $44,674,000 for the quarter ended September 30, 2007; 

* ($46,913,000) for the quarter ended December 31, 2007; 

* ($42,373,000) for the quarter ended March 31, 2008; and: 

* ($12,479,000) for the quarter ended June 30, 2008. 

IV. Procedures on excise tax distributions to the HTF for the quarter 
ended September 30, 2008: 

A. Determine if OTA's process for identifying and incorporating the 
effect of new legislation on excise tax receipts into its trust fund 
estimates[Footnote 25] was in place during the quarter ended September 
30, 2008. 

Description of findings and results: 

OTA's process for identifying and incorporating into its trust fund 
estimates the effect of new legislation on excise tax receipts was in 
place during the quarter ended September 30, 2008. OTA prepares a tax 
rate table to capture information relating to legislation that affects 
tax rates, tax basis, accounts, and deposit rules in effect during the 
quarter. 

B. Inspect the transfer forms and supporting schedules to determine if 
there is evidence of review. 

Description of findings and results: 

There was evidence that another OTA economist reviewed the transfer 
forms and supporting schedules affecting distributions to the HTF for 
the quarter ended September 30, 2008. 

C. Calculate the totals on the transfer forms to determine if they are 
mathematically correct. 

Description of findings and results: 

The totals on the transfer forms affecting distributions to the HTF for 
the quarter ended September 30, 2008, were mathematically correct. 

D. Trace the transfer amounts for diesel fuel tax (abstract 60), 
gasoline tax (abstract 62), and heavy vehicle use tax[Footnote 26] from 
the transfer forms back to the related source documents[Footnote 27] 
for agreement. 

Description of findings and results: 

The transfer amounts for diesel fuel tax (abstract 60), gasoline tax 
(abstract 62), and heavy vehicle use tax from the transfer forms agreed 
with the related source documents for the quarter ended September 30, 
2008. 

V. Other procedures: 

A. Determine if adjustments to the HTF for tax on kerosene used in 
aviation were made during fiscal year 2008 and calculate the adjustment 
amounts to determine if they are mathematically correct[Footnote 28].: 

Description of findings and results: 

Adjustments to the HTF for tax on kerosene used in aviation were made 
during fiscal year 2008 and were mathematically correct. For the 
Highway Account, the adjustment amounts were[Footnote 29] 

* ($197,258,000) for the quarter ended September 30, 2007; 

* ($181,940,000) for the quarter ended December 31, 2007; 

* ($162,108,000) for the quarter ended March 31, 2008; 

* ($164,202,000) for the quarter ended June 30, 2008; and: 

* ($172,346,000) for the quarter ended September 30, 2008. 

For the Mass Transit Account, the adjustment amounts were: 

* ($26,315,000) for the quarter ended September 30, 2007; 

* ($24,271,000) for the quarter ended December 31, 2007; 

* ($21,626,000) for the quarter ended March 31, 2008; 

* ($21,904,000) for the quarter ended June 30, 2008; and: 

* ($22,991,000) for the quarter ended September 30, 2008. 

B. Using IRS's quarterly certifications, OTA's estimated distributions, 
and any adjustments, compile and report the amount of net excise taxes 
distributed to the HTF in fiscal year 2008. 

Description of findings and results: 

Based on a compilation of IRS's quarterly certifications, OTA's 
estimations, and adjustments, the amount of net excise taxes 
distributed to the HTF in fiscal year 2008 was $36,469,761,000. 

[End of section] 

Footnotes: 

[1] In October 2007, the Internal Revenue Service (IRS) completed its 
certification to the HTF for the quarter ended June 30, 2007, and the 
Department of the Treasury's Financial Management Service (FMS) 
recorded the corresponding adjustment to transfer funds between the 
general fund and the trust fund. HTF administrators recorded the 
adjustment amount on the HTF financial statements for fiscal year 2007. 

[2] The IRS certification and corresponding FMS adjustment for the 
quarter ended September 30, 2007, were completed in February 2008, and 
thus affected distributions to the HTF during fiscal year 2008. 

[3] Although the certifications are based on amounts collected, we used 
the tax liability amounts to identify the taxpayers paying the largest 
amounts of excise taxes. These taxpayers generally pay their excise 
taxes in full each quarter. 

[4] The master file is a detailed database containing taxpayer 
information. 

[5] IRS certifies to trust funds the amount of excise taxes collected. 
Because taxpayers have sometimes not fully paid their tax liability, 
IRS must allocate the amount of payments actually received among the 
different excise taxes reported on the taxpayers' returns. IRS's 
Collection Certification System prorates a taxpayer's payments 
proportionately among all taxes reported as owed on the tax return. For 
example, if a corporation reports that it owes $4 million for gasoline 
tax, $2 million for diesel fuel tax, and $1 million for kerosene tax on 
its Form 720, Quarterly Federal Excise Tax Return, but has paid IRS 
only $3.5 million at the time IRS performs its certification, the 
program prorates the $3.5 million in the following manner: $2 million 
to gasoline tax, $1 million to diesel fuel tax, and $500,000 to 
kerosene tax. 

[6] The abstract numbers identify the tax type (e.g., gasoline and 
ticket tax) and are used as the basis for determining the distribution 
of the excise taxes to the various trust funds. Abstract numbers are 
preprinted on Form 720, Quarterly Federal Excise Tax Return, and are 
used by the taxpayer to report excise tax assessments. If the return 
was related to the HTF, we selected (1) diesel fuel tax (abstract 60), 
and (2) gasoline tax (abstract 62). If the return was related to the 
AATF, we selected (1) tax on transportation of persons by air (abstract 
26), (2) tax on the use of international air travel facilities 
(abstract 27), and (3) tax on transportation of property by air 
(abstract 28). The tax amounts related to the selected abstracts for 
each trust fund are the largest tax amounts reported on the taxpayer's 
excise tax return and made up over 85 percent of the total amount 
certified to the HTF and over 92 percent of the total amount certified 
to the AATF for the quarters ended June 30, 2007, and September 30, 
2007. 

[7] The Collection Certification System produces what IRS refers to as 
audit files. These audit files contain the individual prorated 
collections by abstract and taxpayer identification number. The 
certified amounts to the trust funds are calculated by subtracting 
credits from prorated collections and then multiplying the difference 
by the applicable trust fund distribution rates. 

[8] For the purpose of this procedure, "material" is defined as 1 
percent of the excise tax collections for the quarters ended December 
31, 2007, and March 31, 2008. 

[9] This reconciliation is performed as part of the fiscal year 2008 
IRS financial statement audit. It is a reconciliation of all excise tax 
collections that posted to the master file and general ledger during 
the first 9 months of fiscal year 2008 and is not limited to the first 
two quarters. For the purpose of this procedure, "material" is defined 
as 1 percent of the excise tax collections for the first 9 months of 
fiscal year 2008. 

[10] For this sample, if one or no errors were found in testing the 78 
items, we would be 90 percent confident that the error rate in the 
population would not exceed 5 percent. 

[11] The selected abstracts are (1) diesel fuel tax (abstract 60), (2) 
gasoline tax (abstract 62), (3) tax on transportation of persons by air 
(abstract 26), (4) tax on the use of international air travel 
facilities (abstract 27), (5) tax on transportation of property by air 
(abstract 28), and (6) tax on kerosene for use in commercial aviation 
(abstract 77). The tax amounts for the two HTF-related abstracts made 
up over 92 percent of the total amount certified to the HTF, and the 
tax amounts for the four AATF-related abstracts made up over 97 percent 
of the total amount certified to the AATF for the quarters ended 
December 31, 2007, and March 31, 2008. 

[12] The Report of Excise Tax Collection contains prorated collections, 
classified by abstracts, which serve as the basis for IRS's quarterly 
trust fund certifications. 

[13] The planned sample size using MUS was 135 items. MUS selects 
dollars versus specific transaction items by dividing the population by 
dollar intervals. The dollar interval for the HTF was $143 million. 
Accordingly, any item with a dollar value matching or exceeding the 
interval would be selected, whereas items less than the interval might 
not be selected. For example, an item of $286 million would cover 2 
dollar intervals, but represent 1 sample item. Because large-dollar 
items cover more than one interval, the 91 unique sampled transactions 
selected represented 135 dollar intervals. 

[14] For this sample, if no errors were found in testing the 45 items, 
we would be 90 percent confident that the error rate in the population 
would not exceed 5 percent. 

[15] The planned sample size using MUS was 130 items. As explained in 
footnote 13, MUS selects dollars instead of specific transaction items 
by dividing the population by dollar intervals. The dollar interval for 
AATF was $43 million. Because large-dollar items cover more than 1 
interval, the 65 unique sampled transactions selected represented 130 
dollar intervals. 

[16] The purpose of this procedure is to determine whether the 
Collection Certification System prorates correctly. This procedure is 
not intended to determine whether amounts provided to the system are 
correct. 

[17] IRS prepares two certification letters for the HTF each quarter: 
one for the Highway Account and the other for the Mass Transit Account. 

[18] The certified amounts for diesel fuel tax (abstract 60) and 
gasoline tax (abstract 62), along with the heavy vehicle use tax 
(traced separately), made up over made up over 92 percent of the total 
amount certified to the HTF for the quarters ended September 30, 2007, 
December 31, 2007, March 31, 2008, and June 30, 2008. 

[19] The Report of Excise Tax Collection is produced by the Collection 
Certification System. Collections are classified by abstract on the 
report when the related Form 720 tax return has been posted to IRS's 
master file during the processing interval covered by the report. IRS 
uses data from two of these reports, covering sequential processing 
intervals, for each quarterly certification. The two reports used may 
contain collections related to prior quarters that IRS certifies as 
part of the current quarter's collections because the related return 
was not posted to the master file until the processing intervals 
covered by these reports. 

[20] The Treasury 90 Report summarizes excise tax credit information 
and is produced quarterly by IRS submission processing campus systems. 
IRS has seven submission processing campuses that receive and process 
tax returns and payments. 

[21] For this procedure, "significant" is defined as $185 million, 
which represents approximately 2 percent of the total amount certified 
to the HTF for the quarters ended September 30, 2007, December 31, 
2007, March 31, 2008, and June 30, 2008. 

[22] These taxes, which go to the HTF, are reported on Form 2290 and 
are not included in the Collection Certification System. 

[23] The transfer forms denote the amounts estimated by OTA for 
transferring excise taxes to the trust funds. 

[24] A positive amount indicates that the FMS adjustment increased 
excise taxes distributed to the trust fund. A negative amount, shown in 
parentheses, indicates that the FMS adjustment decreased excise taxes 
distributed to the trust fund. 

[25] OTA makes semimonthly estimates of excise tax collections for 
transfer to trust funds. There are five semimonthly estimates for the 
quarter ended September 30, 2008, which affect fiscal year 2008 
distributions to the HTF. 

[26] The transfer amounts for diesel fuel tax (abstract 60), gasoline 
tax (abstract 62), and heavy vehicle use tax made up over 93 percent of 
the total amount transferred to the HTF for the fourth quarter of 
fiscal year 2008. 

[27] The source documents include the IRS report of excise taxes used 
to derive the percentages applied to reported receipts, the Daily 
Treasury Statement, the Monthly Treasury Statement, and the excise tax 
rate table. 

[28] Section 11161 of Pub. L. No. 109-59 (2005), Treatment of Kerosene 
for Use in Aviation, taxes all kerosene taxpayers at the standard 
kerosene rate, unless a taxpayer had removed the kerosene from a 
refinery or terminal directly into an aircraft's fuel tank and thus 
qualified for the lower aviation kerosene tax rate. Amounts received 
under the standard kerosene tax are initially deposited in the HTF. If 
a taxpayer subsequently used the kerosene in aviation, the taxpayer is 
eligible for the lower tax rate associated with aviation kerosene and 
can request a refund. The amount of this refund is transferred from the 
HTF to the general fund. The amount of the kerosene tax collected from 
the taxpayer, net of refunds, is transferred from the HTF to the AATF. 

[29] The adjustments for the quarters ended September 30, 2007, 
December 31, 2007, March 31, 2008, and June 30, 2008, were included in 
the IRS receipt certifications, and the adjustment for the quarter 
ended September 30, 2008, was included in the OTA estimates. The 
adjustment amounts, shown in parentheses, represent excise taxes 
transferred from the HTF to the AATF and general fund. 

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