Representation before the IRS · Supporting documentation
Financial documents and expense records
tax year · reviewed 2026-08-19 · I. Ohu
The rule
Two regimes govern documentation, and knowing which one applies to a given deduction decides how much evidence is enough.
The general regime is IRC § 6001 and Reg. § 1.6001-1. Every person liable for tax must keep permanent books of account or records, including inventories, sufficient to establish the amount of gross income, deductions, credits, or other matters required to be shown on the returnTY2026. Records must be kept at all times available for inspection by authorized internal revenue officers or employees, and retained so long as the contents may become material in the administration of any internal revenue lawTY2026. That standard is open-ended about form: what matters is that the records are sufficient to establish the amounts shown on the return. Where records are imperfect, the general regime tolerates reconstruction and approximation, because the question is whether the taxpayer has established the item to the satisfaction of the trier of fact.
The § 274(d) regime is different in kind. For 3 — traveling expenses under § 162 or § 212 (including meals and lodging while away from home), expenses for gifts, and listed property as defined in § 280F(d)(4)TY2026, no deduction or credit shall be allowed unless the taxpayer substantiates by adequate records, or by sufficient evidence corroborating the taxpayer’s own statement, 4 — the amount of the expense or other item; the time and place of the travel or the date and description of the gift; the business purpose; and the business relationship to the taxpayer of the person receiving the benefitTY2026. This is not a standard of proof; it is a condition on the deduction. Where § 274(d) applies, approximation is unavailable and a credible witness is not enough — the statute forecloses the deduction outright in the absence of the required substantiation.
“Adequate records” under Reg. § 1.274-5T(c)(2) means an account book, diary, log, statement of expense, trip sheet or similar record, together with documentary evidence, which in combination establish each required elementTY2026. The account book and the receipt need not duplicate each other, so long as they complement each other in an orderly manner. The regulation explains the logic: a record made at or near the time of the expenditure or use, supported by sufficient documentary evidence, has a high degree of credibility that a statement prepared afterwards lacks, because there is generally a lack of accurate recall — so corroborative evidence supporting a later statement must have a high degree of probative value to reach the same level of credibility.
Current figures
| Item | Content |
|---|---|
| The general record-keeping standard | permanent books of account or records, including inventories, sufficient to establish the amount of gross income, deductions, credits, or other matters required to be shown on the returnTY2026 |
| How long records must be available | kept at all times available for inspection by authorized internal revenue officers or employees, and retained so long as the contents may become material in the administration of any internal revenue lawTY2026 |
| Categories subject to § 274(d) | 3 — traveling expenses under § 162 or § 212 (including meals and lodging while away from home), expenses for gifts, and listed property as defined in § 280F(d)(4)TY2026 |
| Elements § 274(d) requires for each item | 4 — the amount of the expense or other item; the time and place of the travel or the date and description of the gift; the business purpose; and the business relationship to the taxpayer of the person receiving the benefitTY2026 |
| What “adequate records” means | an account book, diary, log, statement of expense, trip sheet or similar record, together with documentary evidence, which in combination establish each required elementTY2026 |
How it works in practice
Sort the client’s expenses by regime before asking for anything. Travel, gifts and listed property are on the strict track and need contemporaneous records with the four elements. Everything else is on the general track and can be established by whatever combination of evidence is persuasive. A document request that treats both alike either over-asks on ordinary expenses or under-asks on the ones where the statute will not forgive a gap.
A bank statement proves payment, not purpose. This is the single most common evidentiary misunderstanding. A cancelled cheque or a bank line establishes that money moved, to whom, and when. It says nothing about why, which is the element most disallowances turn on. A statement plus an invoice describing what was bought is a complete record; a statement alone is half of one. Where the client has only statements, the work is to reconstruct purpose from surrounding evidence — the supplier’s own records, correspondence, a contract, the business context — and to say plainly which items cannot be supported.
Credit card statements have the same limit and one additional use. They show merchant, date and amount. They also reveal the shape of a year’s spending, which is why the IRS reviews them against the expenses claimed. A representative preparing a substantiation package should read the statements the way the examiner will: looking for claimed expenses that never appear, and for patterns that do not fit the return.
Brokerage records answer basis, which is a different question from income. A consolidated 1099-B now generally reports basis for covered securities, but basis for older holdings, gifted or inherited property, or securities transferred between custodians frequently is not reported or is reported wrong. The supporting documents are the original confirmations, the gift or estate records, and the transfer statements. This is the category where a client’s records most often stop short of what the return needs.
Where an information return is disputed, the burden can shift. In any court proceeding (IRC § 6201(d)), if a taxpayer asserts a reasonable dispute with respect to an item of income reported on an information return and has fully cooperated with the Secretary, the Secretary bears the burden of producing reasonable and probative information in addition to the information return itself. Full cooperation is the condition, and it includes providing access to and inspection of witnesses, information and documents within the taxpayer’s control. Advising a client to stop responding is therefore advising them out of a statutory protection.
Reconstruction is legitimate on the general track, and should be labelled. Where original records were lost, a reconstruction built from bank records, supplier duplicates and calendars is evidence. Presenting it as though it were contemporaneous is not. Say what it is, say how it was built, and say what it rests on — an examiner who discovers the reconstruction independently will discount everything around it.
The mileage log written in April
Ruaridh Nakamura-Oyelowo claims substantial vehicle expenses. When the examination opens he prepares a mileage log from his calendar and his client billing records, covering the whole prior year in a single sitting.
A passenger vehicle is listed property, so § 274(d) applies and approximation is unavailable. The log is not a record made at or near the time of the use, so it does not qualify as adequate records. It can still work as the taxpayer’s own statement — but Reg. § 1.274-5T(c) then requires corroborative evidence with a high degree of probative value to raise it to the credibility of a contemporaneous record. The calendar entries and the client invoices are exactly that kind of corroboration, provided they independently fix the dates, destinations and business purpose. The representative’s job is to present the log as what it is, tied line by line to the corroborating documents, rather than to imply it was kept as he went.
Statements without invoices
Cordelia Achterberg-Mwangi’s supplies deduction is questioned. She produces two years of bank statements showing regular payments to a wholesaler, and nothing else.
The statements establish payment and payee. They do not establish that what was bought was deductible, and the examiner’s position is that some of it was personal. This is a general-track expense, so approximation is available and the deduction is not foreclosed — but somebody has to supply purpose. The productive step is a request to the wholesaler for duplicate invoices, which most suppliers can produce for two years, combined with a statement of the business’s actual consumption. Had this been travel, gifts or listed property, the same evidentiary gap would have been fatal rather than reparable.
The basis nobody could find
Wolfgang Delacroix-Baptiste sells shares he inherited in 2009 and transferred between two brokers in 2016. The Form 1099-B reports proceeds and shows basis as not reported.
The return needs a date-of-death value, which the current broker does not hold and the earlier one may not either. The supporting documents are the estate records — the estate tax return if one was filed, the executor’s valuation, or contemporaneous market data for the date of death — plus the transfer statement establishing the share count. This is general-track evidence and reconstruction is permitted; what is not permitted is reporting basis as zero because the paperwork is hard, or reporting an estimate without saying it is one. Where a defensible figure genuinely cannot be established, the position and its basis should be documented in the file before the return is signed.
How this has changed
The two-regime structure dates to the Revenue Act of 1962, which enacted § 274 in response to a perception that travel and entertainment deductions were being allowed on approximation. The temporary regulations that define adequate records were issued in 1985 and remain temporary four decades later — a fact worth knowing, because their status is occasionally raised and their content is nonetheless the operative rule.
The categories inside § 274(d) have moved. The Tax Cuts and Jobs Act removed computers and peripheral equipment from the listed property definition in § 280F(d)(4) for property placed in service after 2017, taking them out of § 274(d)‘s strict regime; property of a type generally used for entertainment, recreation or amusement remains listed property. Entertainment expenses themselves ceased to be deductible under § 274(a), which changed what the substantiation rules apply to without changing the rules.
On the evidence side, IRC § 6201(d) was added by the Taxpayer Bill of Rights 2 in 1996 and is under-used; it is the provision to reach for when a client’s real dispute is with a payer’s information return rather than with the IRS.
Exam focus
Know the difference between the general § 6001 regime and the strict § 274(d) regime, and know the three categories § 274(d) covers and the four elements it requires. Know that adequate records mean a contemporaneous account book, log or similar record together with documentary evidence, and that a record made at or near the time of the expenditure carries credibility that a later reconstruction must work to match. Expect the exam to test the four elements — amount, time and place or date and description, business purpose, and business relationship — as a set.
Check yourself
1. Which category is not subject to the strict substantiation rules of IRC § 274(d)?
A. Traveling expenses including meals and lodging while away from home B. Expenses for gifts C. Office supplies purchased locally D. Listed property
Answer: C. Ordinary supplies fall under the general § 6001 regime, where approximation and reconstruction are available.
2. What does § 274(d) require the taxpayer to substantiate for each covered item?
A. Amount only B. Amount and business purpose only C. Amount; time and place of travel or date and description of the gift; business purpose; and the business relationship of the person receiving the benefit D. Amount, and the identity of the payee
Answer: C.
3. What constitutes “adequate records” for § 274(d) purposes?
A. A bank statement showing the payment B. An account book, diary, log, statement of expense, trip sheet or similar record, together with documentary evidence C. The taxpayer’s signed statement of the expense D. A summary schedule prepared at the time the return is filed
Answer: B. The record and the receipt need not duplicate each other so long as they complement each other in an orderly manner.
4. A taxpayer prepares a log after the year has ended. What is the evidentiary consequence?
A. It is disregarded entirely B. It is treated as adequate records C. It may serve as the taxpayer’s own statement, but the corroborating evidence must have a high degree of probative value D. It shifts the burden of proof to the IRS
Answer: C.
5. A cancelled cheque establishes which element of a business expense?
A. That the amount was paid, and to whom B. The business purpose of the payment C. The business relationship of the payee D. All required elements
Answer: A. Purpose and relationship must come from other evidence.
Change log
- Initial draft.
Related topics
- Other substantive and contemporaneous documentation (e.g., corporate minutes) 3.2.4.d
- Verification and substantiation of entries on the return 3.3.3.c
- Taxpayer’s burden of proof 3.3.3.i
- Legal documents (e.g., birth certificate, divorce decrees, lawsuit settlements) 3.2.4.b
- Prior and subsequent tax returns 3.2.4.c
- Business entity supporting documents (e.g., partnership agreement, corporate bylaws) 3.2.4.e