IRS Section 274(d) Substantiation Requirements

To deduct a business travel expense, a business gift, or a cost tied to a vehicle or other listed property, the Section 274(d) substantiation requirements make you document four things for every single expenditure: the amount, the time and place, the business purpose, and the business relationship of anyone else who benefited. Miss one element and the whole deduction goes away, even if nobody doubts you spent the money. Estimates don’t work here. Reconstructing from bank statements at tax time doesn’t work either. The records have to be built at or near the time of the expense and backed by receipts.

Which Expenses This Rule Covers

Section 274(d) applies to three categories of spending, and it’s worth checking that your expense actually falls inside one of them before worrying about the paperwork.

The first is travel while you’re away from home overnight for business, including transportation, lodging, and meals. Self-employed taxpayers claim these on Schedule C. Employees generally can’t deduct unreimbursed business travel on their personal returns anymore. The Tax Cuts and Jobs Act suspended that deduction starting in 2018, and the One Big Beautiful Bill Act signed in 2025 made the elimination permanent. If your employer doesn’t reimburse you, the federal return offers nothing.

The second is business gifts, capped at $25 per recipient per year, a limit that hasn’t changed since 1962.

The third is listed property, defined in IRC Section 280F(d)(4). In practice this means passenger vehicles and other transportation property, plus property typically used for entertainment or recreation.¹ Computers used to be on this list. The PATH Act removed them in 2015, so a laptop you buy for your business no longer needs the mileage-log style of tracking that a vehicle does.

The Four Elements You Must Document

Every expense in scope needs all four of these on the record.²

Amount. The dollar cost of each expenditure. Small routine daily costs like taxi fares or tips can be grouped into a single daily total. Larger expenses need to be tracked individually.

Time and place. For travel, that means departure and return dates, the number of days spent on business, and the destination city. For gifts, it means the date and a description of what you gave.

Business purpose. A specific reason. “Client meeting” is too vague to survive scrutiny. “Met with Jane Smith to review Q3 contract terms” is the level of detail that holds up.

Business relationship. The name and business connection of anyone else who benefited from the expense. For a gift, identify the recipient and their relationship to your business. For travel, this matters when you’re paying for someone else’s trip, such as a client’s airfare.

Section 274(d) was written specifically to override the Cohan rule, a 1930 court decision that let taxpayers estimate deductions when exact records weren’t available. Congress carved these categories out because estimation kept getting abused. If your records don’t clear the standard, the deduction is zero.

What Counts as Adequate Records

The IRS accepts two substantiation methods: adequate records, or sufficient evidence corroborating your own statement. The first is far stronger, and it’s what you should build your system around.²

Adequate records means two things working together. First, a contemporaneous log — a diary, a spreadsheet, or an app — with entries made at or near the time of the expense. Writing down trip details three months later from memory doesn’t qualify. The record is trustworthy precisely because it was created in real time.

Second, documentary evidence: receipts, invoices, or paid bills. You need a receipt for every lodging expense regardless of amount, and for any other individual expense of $75 or more. Transportation charges where receipts aren’t readily available, like tolls, are an exception.³ A good receipt shows the amount, date, place, and nature of the expense. Credit card statements alone typically don’t contain enough detail.

The second method, sufficient evidence, is a fallback for lost or incomplete records. You provide your own written or oral statement and back it up with whatever secondary evidence you can find: testimony from others, circumstantial details, reconstructed calendars. It invites skepticism and puts you in a much weaker position during an audit. Don’t plan around it.

Scanned Receipts and Digital Records

You don’t need to keep paper. The IRS allows electronic storage of records, including scanned images, as long as the images are legible and reproducible as hard copies, the system has reasonable controls against alteration or deletion, and there’s an indexing system creating a clear trail between each stored image and the corresponding entry in your books.⁴ Most expense-tracking apps meet these requirements. The test is whether an auditor can follow the thread from your tax return to your ledger to the individual receipt.

Per Diem Rates as a Shortcut for Travel

Instead of tracking actual meal and lodging costs dollar by dollar, you can use federal per diem rates to substantiate the amount element for travel. For the period beginning October 1, 2025, the IRS high-low method sets a per diem of $319 per day for high-cost localities and $225 per day for other areas within the continental United States. Meals-only rates are $86 and $74 respectively.⁵

Self-employed taxpayers have an important limitation: you can only use the per diem method for meals, not lodging. Employers reimbursing employees can use per diem for both. If you work for yourself, actual receipts for hotel costs are still required.⁶

Per diem only covers amount. You still document time, place, and business purpose separately for every trip. And the meal portion remains subject to the 50% deduction limitation under Section 274(n), so you deduct half of the meal allowance on the return.

Vehicles: Where Most People Lose the Deduction

Vehicle expenses are where 274(d) trips up the most taxpayers. The central requirement is tracking the percentage of business use versus personal use, because that percentage controls what you can deduct for depreciation, lease payments, gas, insurance, and maintenance.

Adequate records for a vehicle means a contemporaneous mileage log capturing four things for every business trip: the date, the destination, the miles driven, and the specific business purpose. You also record the odometer reading at the start and end of each year to calculate total annual mileage. Business use percentage is business miles divided by total miles.⁷

The IRS standard mileage rate for 2026 is 72.5 cents per mile for business use, available as an alternative to tracking actual expenses. Even if you use the standard rate, the mileage log requirements are the same.

Commuting Miles Don’t Count

Driving from home to your regular workplace and back is commuting, and those miles are always personal, no matter the distance. Commuting miles inflate total annual mileage without adding to business mileage, which pulls down your business use percentage. The exception is if your home qualifies as your principal place of business, in which case trips from home to client sites or other work locations can count as business travel.⁷

The 50 Percent Business Use Threshold

Keeping business use above 50% matters beyond the basic deduction math. If business use drops to 50% or below in any year during the recovery period, you lose Section 179 expensing and bonus depreciation. Depreciation has to be recalculated using straight-line over the Alternative Depreciation System recovery period. And if you claimed accelerated depreciation or a Section 179 deduction while above 50%, then fell below, you have to recapture the excess depreciation as income.⁸

Business Gift Substantiation

Gifts have their own paperwork on top of the general four elements. Because the deduction caps at $25 per recipient per year, record-keeping here is less about tracking dollars and more about proving who received what and why. For each gift, record the date, a description of the item, the recipient’s name, their occupation or title, and the business reason.⁹

Incidental costs like engraving, wrapping, and shipping don’t count toward the $25 cap, so long as they don’t add substantial standalone value. A $24 bottle of wine with $8 shipping stays under the limit, and the shipping is separately deductible. Package the same wine in a handcrafted wooden box worth $30 and the box isn’t incidental anymore. An ornamental basket holding fruit counts toward the limit if the basket has real value relative to the fruit.⁹

Employees and Accountable Plans

Since employees can no longer deduct unreimbursed business expenses on their personal returns, employer reimbursement is now the only route to a tax benefit from these expenses. The mechanism is the accountable plan, which lets employers reimburse employees tax-free when three conditions are met.¹⁰

First, business connection: the reimbursement covers expenses the employee actually incurred on the job. The plan can’t pay out money regardless of spending.

Second, substantiation: the employee documents each expense to the employer within a reasonable time, meeting the four-element standard for 274(d) expenses.

Third, return of excess: reimbursement above actual substantiated expenses gets returned within a reasonable time.

When all three are met, reimbursements aren’t reported as wages on the W-2 and aren’t subject to payroll taxes. If any one fails, the reimbursement is taxable income.

How Long to Keep the Records

The general rule is at least three years from the date you filed the return, or the due date, whichever is later. Several situations extend that.¹¹

Six years, if you underreport income by more than 25% of the gross income shown on your return.
Seven years, if you claim a loss from worthless securities or a bad debt deduction.
Indefinitely, if you don’t file a return or file a fraudulent one.

For listed property like vehicles, keep the mileage log and supporting records for the length of the depreciation recovery period plus three years after the final return claiming depreciation. Selling or disposing of listed property can also trigger the need for historical records to calculate gain or recapture, so hold vehicle logs at least three years past the sale or the end of business use.

What Happens When Substantiation Fails

The first consequence is losing the deduction entirely. From there, additional problems can stack on top.

Under Section 7491, the burden of proof in a tax dispute can shift from you to the IRS if you introduce credible evidence, comply with all substantiation requirements, and maintain records while cooperating with reasonable IRS requests.¹² For 274(d) expenses, that shift is almost impossible to trigger without adequate records, because inadequate records mean you haven’t complied with the substantiation requirements in the first place. In practice, you’re stuck proving these deductions yourself.

When disallowed expenses create a tax underpayment, the IRS can add the 20% accuracy-related penalty under Section 6662, which applies to underpayments caused by negligence or disregard of rules. Claiming 274(d) deductions without the required records fits within disregard of rules, since the requirements are explicit in the statute.¹³ In cases involving intentional fraud, the penalty rises to 75% of the underpayment attributable to fraud.¹⁴

1
Office of the Law Revision Counsel. 26 USC 280F – Limitation on Depreciation for Luxury Automobiles; Limitation Where Certain Property Used for Personal Purposes
2
Office of the Law Revision Counsel. 26 USC 274 – Disallowance of Certain Entertainment, Etc., Expenses
3
Internal Revenue Service. Revenue Ruling 2003-106
4
Internal Revenue Service. Rev. Proc. 97-22
5
Internal Revenue Service. Notice 2025-54
6
Internal Revenue Service. Per Diem Payments Frequently Asked Questions
7
Internal Revenue Service. Publication 463 (2025), Travel, Gift, and Car Expenses
8
Internal Revenue Service. Publication 946 (2025), How To Depreciate Property
9
eCFR. 26 CFR 1.274-3 – Disallowance of Deduction for Gifts
10
eCFR. 26 CFR 1.62-2 – Reimbursements and Other Expense Allowance Arrangements
11
Internal Revenue Service. How Long Should I Keep Records
12
Office of the Law Revision Counsel. 26 U.S. Code 7491 – Burden of Proof
13
Office of the Law Revision Counsel. 26 U.S. Code 6662 – Imposition of Accuracy-Related Penalty on Underpayments
14
Office of the Law Revision Counsel. 26 U.S. Code 6663 – Imposition of Fraud Penalty