Tax Invoice Requirements: Receipts, 1099s, and Recordkeeping

IRS invoice requirements aren’t a single template. Federal tax law doesn’t dictate what an invoice must look like, but it does require that the documents you use to back up a deduction or report a payment show five things: who was paid, how much, proof the payment happened, the date, and a description that ties the expense to your business. Fall short on any of those, and the deduction can disappear. Get an information return like a 1099-NEC wrong, and the per-form penalties for returns due in 2026 run from $60 to $340, or $680 if the IRS decides you ignored the rules on purpose.

The Five Elements Every Supporting Document Must Show

For most purchases and operating expenses, the IRS wants your records to establish the payee, the amount paid, proof of payment, the date, and a description showing the expense was for business purposes.¹

No single document has to carry all five. Invoices, canceled checks, credit card receipts and statements, cash register tapes, and account statements are all acceptable, and you’ll often need a combination. A vendor invoice can show the payee, amount, date, and description; a bank or card statement then confirms that the money actually moved. The IRS looks at the whole package, not one magic receipt.²

What to Put on Invoices You Issue

The invoices you send to your own customers should mirror what the IRS expects on documents you receive. That means your business name and address, your tax identification number, a unique invoice number, the date, a clear description of the goods or services, itemized quantities and prices, and the total due. A clean invoice does double duty: it gives your customer a document that supports their deduction, and it gives you a record that ties directly to the income you report.

Stricter Rules for Travel, Meals, and Gifts

A few categories of expense sit under a tighter rule. Section 274(d) of the Internal Revenue Code disallows deductions for travel (including meals and lodging away from home), business gifts, and the use of listed property like vehicles unless you can prove four specific things: the amount; the time and place, or the date and description for a gift; the business purpose; and the business relationship of the person who benefited.³

These records need to be made at or near the time of the expense. A contemporaneous log, diary, or expense report carries far more weight than a spreadsheet reconstructed months later from memory. A hotel receipt showing the hotel name, location, dates, and a breakdown of lodging and meal charges covers most of what’s needed for a trip. A restaurant receipt should show the restaurant name, location, date, and total.⁴

The $75 Receipt Exception

Not every small purchase needs a paper trail. The IRS waives the documentary evidence requirement for business expenses under $75, with one exception: lodging always requires a receipt no matter the cost.⁵ You still have to log the amount, date, and business purpose. You just don’t have to produce the receipt itself.

When You’ve Lost the Records

Under a long-standing judicial principle known as the Cohan rule, courts will let taxpayers estimate business expenses when the original records are gone, as long as there’s a factual basis for the estimate. Bank statements, calendar entries, and other circumstantial evidence can support a reasonable approximation.

The Cohan rule does not apply to anything covered by Section 274(d). For travel, meals, gifts, and listed property, missing records mean a lost deduction. This is where most people get burned, because those are exactly the expenses whose paperwork tends to scatter.³

Invoices Feed Your 1099 Reporting

When you pay an independent contractor or service provider $600 or more during the year, you have to report those payments to the IRS on Form 1099-NEC.⁶ To fill in that form accurately, you need the contractor’s legal name, address, and taxpayer identification number, which is one of the practical reasons to insist on complete invoice information up front.

The tool for collecting the TIN is Form W-9. Get a completed W-9 before paying a new vendor. If a payee refuses to give you a TIN, you’re required to withhold 24% of each payment and send it to the IRS as backup withholding.⁷ Skip the backup withholding when it’s required and you become personally liable for the amount you should have collected. The same 24% rate kicks in when the IRS notifies you that a payee’s TIN is incorrect.⁸

Penalties for Missing or Wrong Information Returns

Filing a 1099 with wrong data, a missing TIN, or after the deadline triggers penalties under Sections 6721 and 6722. The structure is tiered, so speed helps.⁹

For returns due in 2026, the inflation-adjusted per-return penalties are:

Corrected within 30 days of the due date: $60 per return, capped at $683,000 for the year, or $239,000 for small businesses with gross receipts of $5 million or less.
Corrected after 30 days but by August 1: $130 per return, capped at $2,049,000, or $683,000 for small businesses.
Corrected after August 1 or not corrected: $340 per return, capped at $4,098,500, or $1,366,000 for small businesses.
Intentional disregard: $680 per return with no annual cap.¹⁰

The same tiers apply under Section 6722 for failing to send a correct payee statement, meaning the copy of the 1099 you give the contractor.¹¹ A business that files 500 incorrect 1099s and doesn’t fix them until September faces $170,000 in penalties before any other consequences. These amounts adjust for inflation each year.

The Accuracy Penalty on Unsupported Deductions

Beyond information return penalties, claiming deductions you can’t substantiate exposes you to the accuracy-related penalty under Section 6662. If the IRS decides you underpaid because of negligence or disregard of the rules, the penalty is 20% of the underpayment.¹²

The same 20% penalty applies to a “substantial understatement” of income tax. For individuals, that generally means understating liability by the greater of 10% of the correct tax or $5,000.¹² Claim a $50,000 deduction for consulting services with no invoice, engagement letter, or bank record to back it, and you can lose the deduction and pay 20% of the resulting tax shortfall on top.

Keeping the Records

Scanned invoices are fine, as long as your storage system meets the standards in Revenue Procedure 97-22. The system has to index, store, preserve, retrieve, and reproduce your books and records, and it has to include controls that block unauthorized changes or deletions.¹³

Reproductions must be highly legible on screen and in print, and every letter and number has to be identifiable without ambiguity. The indexing has to work like a well-organized filing system so a specific record can be found quickly, and the records must create an audit trail between your general ledger and the source documents that support each entry. If the IRS asks for access during an examination, you have to provide the hardware, software, and personnel needed to locate and reproduce the files, and any vendor contract you use can’t restrict that access. Scanned images do not replace the underlying machine-readable accounting data addressed in Revenue Procedure 98-25.¹⁴

How Long to Keep Them

The standard retention period is three years from when the return was filed or due, whichever is later. Several situations stretch that:¹⁵

Unreported income over 25% of gross income: six years.
Worthless securities or bad debt deduction: seven years.
Employment tax records: at least four years after the tax is due or paid, whichever is later.
Property records: keep until the limitations period runs out for the year you dispose of the property, because you’ll need them to calculate depreciation and gain or loss.
Unfiled or fraudulent returns: indefinitely. There’s no statute of limitations on assessment if you never file.¹⁶

For most businesses, seven years is a safe default. Storage is cheap; reconstructing records you threw away is not. If you claim depreciation on equipment, hold the original purchase invoice for the life of the asset plus the applicable retention period after disposal.

Invoices in Foreign Currency

If you receive or pay invoices in a foreign currency, every amount on your U.S. return still has to be reported in U.S. dollars. Convert using the exchange rate prevailing on the date the income was received, the expense was paid, or the item accrued. When more than one rate exists for a given currency, use the rate that most accurately reflects your income.¹⁷

The IRS doesn’t require a specific source for exchange rates. Banks, the Treasury Department, the Federal Reserve, and widely used online sources are all acceptable. Be consistent, and record the rate you used alongside each foreign-currency invoice so the conversion is traceable if you’re audited.

Fixing an Information Return After You File

If you’ve already filed a 1099-NEC or 1099-MISC and spot an error, file a corrected version. The mechanics depend on how you filed originally: paper filers follow the General Instructions for Certain Information Returns, and electronic filers follow the publication that matches their system.¹⁸

One trap on paper corrections: don’t check the “VOID” box. That instruction tells IRS scanning equipment to skip the form, and your correction never enters the system. If the corrected amount changes what the recipient owes, send them a corrected copy as well so they can amend their own return.¹⁸

Move fast. A correction within 30 days of the original due date costs $60 per form. Wait until fall and it’s $340. The penalty clock doesn’t care whether the mistake originated with you or the vendor; the filer is responsible for every return.¹⁰

1
Internal Revenue Service. What Kind of Records Should I Keep
2
Internal Revenue Service. Publication 583 (12/2024), Starting a Business and Keeping Records
3
Office of the Law Revision Counsel. 26 US Code 274 – Disallowance of Certain Entertainment, Etc., Expenses
4
eCFR. 26 CFR 1.274-5A – Substantiation Requirements
5
Internal Revenue Service. Publication 463 (2025), Travel, Gift, and Car Expenses
6
Internal Revenue Service. Am I Required to File a Form 1099 or Other Information Return
7
Internal Revenue Service. Instructions for the Requester of Form W-9
8
Internal Revenue Service. Backup Withholding
9
Office of the Law Revision Counsel. 26 USC 6721 – Failure to File Correct Information Returns
10
Internal Revenue Service. IRM 20.1.7 Information Return Penalties
11
Office of the Law Revision Counsel. 26 US Code 6722 – Failure to Furnish Correct Payee Statements
12
Internal Revenue Service. Accuracy-Related Penalty
13
Internal Revenue Service. Revenue Procedure 97-22
14
Internal Revenue Service. Revenue Procedure 98-25
15
Internal Revenue Service. How Long Should I Keep Records
16
Internal Revenue Service. Time IRS Can Assess Tax
17
Internal Revenue Service. Foreign Currency and Currency Exchange Rates
18
Internal Revenue Service. Instructions for Forms 1099-MISC and 1099-NEC