IRS Substantiation and Adequate Records for Business Expenses

The IRS substantiation requirements for business expenses come from two different places in the tax code, and knowing which one applies to a given expense decides how much paperwork you need. For most ordinary business costs, the general recordkeeping rule under Section 6001 requires whatever records the Treasury Department prescribes to establish the deduction.¹ For travel, business gifts, and “listed property” like vehicles and computers, Section 274(d) imposes a stricter standard: you must contemporaneously document four specific elements, and missing any one of them can wipe out the deduction entirely.²

The Four Elements You Must Document

Section 274(d) and Treasury Regulation § 1.274-5T require records that capture four things for every covered expense:³

The amount you paid, including tax and tip. Estimates don’t count.
The time and place. For a gift, use the date and a description of the gift instead of a location.
The business purpose, explained clearly enough to show how the expense connects to your trade or business.
The business relationship of anyone who received a benefit, with a name, title, or other identifying detail.

Timing matters as much as content. Records need to be made at or near the time of the expense. A log reconstructed weeks or months later is less reliable to the IRS and to a court, and failure to document any single element can result in the full disallowance of the deduction.²

Which Expenses Trigger the Strict Rule

Only three categories fall under Section 274(d):

Travel expenses, including meals and lodging while you are away from home for business.
Gifts to business contacts.
Listed property, meaning assets that commonly have both personal and business uses, such as vehicles, computers, and cell phones.

Everything else, from office rent to raw materials to utility bills, still needs adequate documentation under Section 6001, but you have a safety net. Under the long-standing Cohan rule, courts can allow a deduction based on reasonable estimates when you can show some factual basis for the expense. The approximation is the court’s, and it will be less generous when your poor records are self-inflicted rather than the result of a disaster.² For travel, gifts, and listed property, Cohan does not apply. Inadequate records mean the deduction is gone.

Receipts, the $75 Threshold, and Lodging

Beyond a log, you generally need documentary evidence: receipts, invoices, or canceled checks showing the date, amount, place, and nature of the expense. A restaurant receipt, for instance, should show the restaurant’s name and location, the date, and the amounts charged.

Two rules narrow the paper burden. You do not need a receipt for any single expense under $75, as long as you still record the four substantiation elements in a diary or account book. Lodging is the exception to the exception: you always need a receipt for lodging, regardless of amount.⁴ If a receipt has gone missing, the IRS may accept other reliable evidence, such as a credit card statement paired with a contemporaneous log entry, though reconstructed proof draws extra scrutiny.

Vehicle Expense Records

Vehicles are listed property, so the strict substantiation rules apply. Your deduction method determines what you record on top of the mileage log.

Standard Mileage Rate

For 2026, the IRS standard mileage rate for business driving is 72.5 cents per mile, which folds gas, insurance, depreciation, and maintenance into a single per-mile figure.⁵ To use this rate, you have to elect it in the first year the vehicle is available for business use. For a leased vehicle, once you pick the standard rate you must use it for the entire lease period, including renewals.⁶

Actual Expenses

If you elect actual expenses, keep every receipt for gas, oil changes, tires, insurance, registration, and repairs, and deduct only the business-use percentage of those costs.

Either method requires the same log. Record the odometer reading at the start and end of each business trip, the date, the destination, and the business purpose. You also need your total annual mileage so the business-use percentage can be calculated.

Travel Away From Home

When you travel overnight for business, your records need to show departure and return dates, the destination city, and the business reason for the trip. If a trip mixes business and personal days, only the business-day expenses are deductible, so your log has to separate the two clearly at the same destination.²

Per Diem Shortcut

The IRS allows a flat daily rate in place of tracking each meal receipt. Use the per diem method and you do not need meal receipts, though you still document the time, place, and business purpose of the travel. The amount element is satisfied by the per diem rate itself.⁴

For travel on or after October 1, 2025, the IRS “high-low” simplified rates are $319 per day for high-cost localities and $225 per day for other areas within the continental United States. The meals-and-incidentals-only rates are $86 for high-cost areas and $74 elsewhere.⁷ Self-employed individuals can use the meals-only per diem; the full lodging-plus-meals rate is generally available only through an employer’s accountable plan.

Business Meals and the 2026 Change

Business meals remain 50% deductible when the meal is not lavish, you or an employee are present, and there is a clear business purpose.⁸ The temporary 100% deduction for restaurant meals expired after 2022.

A new restriction takes effect January 1, 2026, under Section 274(o). Meals provided through an employer-operated eating facility and meals provided for the convenience of the employer become fully nondeductible.⁹ If your company runs a cafeteria or subsidized dining room, neither the operating cost nor the food served can be written off.

Entertainment expenses stayed fully nondeductible after the 2017 Tax Cuts and Jobs Act.¹⁰ If you take a client to a sporting event, food purchased there is 50% deductible only when it appears as a separate line item on the receipt. Bundled into the entertainment charge, the whole amount is lost.

Business Gifts

Gifts to business contacts have their own dollar cap layered on top of the four-element rule. You can deduct no more than $25 per recipient per year.¹¹ Married couples filing jointly count as one taxpayer, so spouses cannot each claim a separate $25 for the same recipient. In a partnership, the $25 cap applies to both the partnership and each individual partner.

Two narrow exceptions sit outside the limit: items costing $4 or less that carry your business name permanently imprinted and are distributed broadly, such as branded pens; and signs, display racks, or promotional materials used on the recipient’s business premises.¹¹ For every other gift, record the recipient’s name, business relationship, the date, a description, and the cost.

Accountable Plans for Employee Reimbursements

If you reimburse employees for business expenses, the structure of the arrangement decides whether those payments are taxable. Under an accountable plan, reimbursements stay out of the employee’s income and out of payroll tax. The plan must satisfy three requirements:

Business connection. The expense must be a deductible business cost incurred in connection with the employee’s work.
Substantiation. The employee must give the employer adequate documentation. For travel and entertainment, that means meeting Section 274(d). Expenses substantiated within 60 days fall inside the IRS safe harbor.
Return of excess. Any reimbursement above the substantiated amount must come back to the employer within a reasonable period.

Miss any of the three and every dollar paid under the plan becomes taxable wages, reported on the employee’s W-2, subject to withholding, and generating payroll tax for both sides.¹² Sloppy recordkeeping at this level creates a tax liability nobody expected.

How Long to Keep the Records

The general retention period is three years from the date you filed the return, which tracks the statute of limitations for IRS assessments.¹³ The IRS also recommends holding records for two years from the date you paid the tax if that is later, since that window controls your ability to claim a refund.¹⁴

Two situations stretch the window. Omit more than 25% of the gross income you reported and the IRS has six years to assess. File a fraudulent return, or never file at all, and there is no statute of limitations; the IRS can come back at any time.¹⁵ Keep those records indefinitely.

Depreciable property runs on its own clock. Keep documentation for any asset you depreciate until the statute of limitations expires for the year you sell or dispose of it. If you received the property in a tax-free exchange, retain records for both the old and new property until the limitations period expires for the year you finally dispose of the replacement.¹⁶ A building placed in service today and held for 20 years means keeping the original purchase records for more than two decades.

Electronic Storage and Lost Records

Paper storage is optional. Revenue Procedure 97-22 allows electronic recordkeeping through scanning or transfer of digital files, provided the system prevents unauthorized changes and can produce legible hard copies on demand.¹⁷ Digital copies maintained under those standards carry the same weight as paper originals during an audit or in court.

If disaster destroys your records, the IRS accepts reconstruction. Start with free transcripts of prior returns through the IRS Get Transcript tool or by calling 800-908-9946. Credit card and bank statements can stand in for individual receipts by showing date, amount, and vendor. For property, contact the title company, escrow company, or lender that handled the purchase; contractors can verify improvement work and cost; probate court records may show appraised values on inherited property; and county assessor offices sometimes hold older valuations. Publication 584-B walks business owners through the process.¹⁸

One important boundary: after-the-fact reconstruction only rescues expenses that fall outside Section 274(d). For travel, gifts, and listed property, the Cohan estimate approach does not apply, and no reconstruction effort fully replaces the contemporaneous records the law requires. Back up 274(d) records digitally and store copies off-site.

What Happens If Your Records Don’t Hold Up

Losing a deduction is only the first cost. When poor records produce an underpayment, the IRS can add an accuracy-related penalty of 20% on the underpaid amount if the shortfall came from negligence or disregard of the rules.¹⁹ If any part of the underpayment is attributable to fraud, the penalty rises to 75% of the fraudulent portion. Once the IRS establishes fraud on any piece, the entire underpayment is presumed fraudulent unless you prove otherwise by a preponderance of the evidence.²⁰

The far more common outcome is the quieter one: an examiner disallows deductions during an audit because the records don’t meet the statute. For a business with meaningful travel and vehicle expenses, that alone can mean thousands of dollars in additional tax before any penalty is added.

1
Office of the Law Revision Counsel. 26 USC 6001 – Notice or Regulations Requiring Records, Statements, and Special Returns
2
Office of the Law Revision Counsel. 26 USC 274 – Disallowance of Certain Entertainment, Etc., Expenses – Section: Substantiation Required
3
eCFR. 26 CFR 1.274-5 – Substantiation Requirements
4
Internal Revenue Service. Publication 463 – Travel, Gift, and Car Expenses
5
Internal Revenue Service. IRS Sets 2026 Business Standard Mileage Rate at 72.5 Cents per Mile, Up 2.5 Cents
6
Internal Revenue Service. Topic No. 510 – Business Use of Car
7
Internal Revenue Service. Notice 2025-54 – Special Per Diem Rates
8
Office of the Law Revision Counsel. 26 USC 274 – Disallowance of Certain Entertainment, Etc., Expenses – Section: Only 50 Percent of Meal Expenses Allowed as Deduction
9
Office of the Law Revision Counsel. 26 USC 274 – Disallowance of Certain Entertainment, Etc., Expenses – Section: Disallowance of Certain Employer Meals
10
Internal Revenue Service. Meals and Entertainment Expenses Under Section 274 (TD 9925)
11
Office of the Law Revision Counsel. 26 USC 274 – Disallowance of Certain Entertainment, Etc., Expenses – Section: Gifts
12
Internal Revenue Service. Revenue Ruling 2003-106 – Accountable Plan Requirements
13
Office of the Law Revision Counsel. 26 USC 6501 – Limitations on Assessment and Collection
14
Internal Revenue Service. Time You Can Claim a Credit or Refund
15
Office of the Law Revision Counsel. 26 USC 6501 – Limitations on Assessment and Collection – Section: Exceptions
16
Internal Revenue Service. How Long Should I Keep Records
17
Internal Revenue Service. Revenue Procedure 97-22
18
Internal Revenue Service. Taxpayers Can Follow These Steps After a Disaster to Reconstruct Records
19
Office of the Law Revision Counsel. 26 USC 6662 – Imposition of Accuracy-Related Penalty on Underpayments
20
Office of the Law Revision Counsel. 26 USC 6663 – Imposition of Fraud Penalty