A vendor check is a business payment issued to a supplier or service provider for goods delivered or services performed, printed on secure check stock and tied to a specific invoice so the payment leaves a clear audit trail. Vendor checks sit at the end of the accounts payable cycle, and getting them right means handling four things well: the information on the check itself, the controls around who authorizes it, the tax paperwork that follows the payment, and the records you keep afterward.
What Has to Be on the Check
Before any check goes out, you need a completed Form W-9 from the vendor giving you their legal name and taxpayer identification number, signed under penalty of perjury.1Internal Revenue Service. Instructions for the Requester of Form W-9 (03/2024) Collect it at onboarding. It determines whether you’ll need to withhold taxes on the payment, and it prevents scrambling at year end.
The check itself needs:
- The payee’s full legal name on the “Pay to the Order Of” line, matching the W-9 exactly.2IRS. Form W-9 (Rev. March 2024)
- The dollar amount, entered as a number in the amount box and spelled out in words on the line below. If the two conflict, the written words control under the Uniform Commercial Code.3Legal Information Institute (LII) / Cornell Law School. UCC 3-114 – Contradictory Terms of Instrument
- The issuance date. A bank has no obligation to honor a check presented more than six months after its date, though it may choose to in good faith.4Legal Information Institute (LII) / Cornell Law School. UCC 4-404 – Bank Not Obliged to Pay Check More Than Six Months Old
- An invoice number or purchase order code in the memo line. This lets the vendor apply the payment to the right account and cuts down on disputes and double payments.
- A mailing address verified against the most recent invoice.
Why Check Stock Matters
Vendor checks aren’t printed on ordinary paper. The bottom of every check carries a line of characters printed in MICR (Magnetic Ink Character Recognition) ink, containing magnetic particles that bank readers use to capture account and routing numbers at high speed.5Accredited Standards Committee X9. Standards Advisory – Magnetic Ink Still Required on Checks Checks printed without MICR ink may require manual entry at the bank, which slows processing and increases errors.
Commercial check stock also builds in several anti-fraud features. Chemical-reactive paper stains dark if someone tries to wash off the ink with solvents. A hidden “VOID” pattern appears on photocopies. Watermarks in the paper fibers show under light but can’t be reproduced on a standard printer. Heat-sensitive ink fades briefly when rubbed, giving a quick authenticity test. Any attempt to alter or duplicate a check on this stock leaves visible evidence.
Authorization and Controls
A vendor check isn’t valid until an authorized signer signs it, and the person who prepared the check should never be the same person who signs it. That separation is one of the most basic internal controls against fraud. When one employee can both create a payable and approve its payment, the door opens to fictitious-vendor schemes that route company funds to a shell entity.
Banks verify signatures against the corporate resolution and signature cards on file for the account, and can reject a check signed by anyone not on those documents. Regular bank reconciliations catch discrepancies between what you issued and what cleared, flagging alterations that happened after the check left your office.
Positive Pay
Businesses issuing many checks often add Positive Pay. You send your bank a file of every check you’ve issued — check number, dollar amount, account number, and issue date. When checks are presented, the bank matches them against your list and flags anything that doesn’t match as an exception, refusing payment until you approve it.6Office of the Washington State Auditor. Positive Pay Can Help Protect Your Organization From Check Fraud It catches altered amounts, forged check numbers, and checks drawn on your account that you never issued. Positive Pay doesn’t typically verify the payee name, so treat it as one layer, not the whole defense.
Stop-Payment Orders
If a check is lost, stolen, or issued in error, you can instruct your bank to stop payment on it. Fees commonly run $15 to $36 depending on the bank and whether you submit online or by phone, and some premium business accounts waive the fee. A stop-payment order is time-limited, usually six months, so a check that stays outstanding past that window may need the order renewed.
When You Have to Withhold 24%
If a vendor refuses to return a W-9, or gives you a taxpayer ID that’s obviously wrong (too few digits, too many digits, or containing letters), federal law requires you to withhold 24% of every reportable payment and send it to the IRS.7Internal Revenue Service. Publication 15 (2026), (Circular E), Employers Tax Guide This is backup withholding, and it starts immediately when the TIN is missing or clearly invalid.8Internal Revenue Service. Backup Withholding B Program
You’re expected to make up to three attempts to solicit a valid TIN — an initial request, a first annual follow-up, and a second annual follow-up — before penalties for missing TINs on your information returns apply.8Internal Revenue Service. Backup Withholding B Program Amounts you withhold get reported on Form 945, the annual return for non-payroll federal income tax withholding.9Internal Revenue Service. About Form 945, Annual Return of Withheld Federal Income Tax Once a vendor sees roughly a quarter of their payment held back, the W-9 usually appears quickly.
Form 1099-NEC and the New $2,000 Threshold
When you pay a non-employee vendor for services, you may have to report those payments to the IRS on Form 1099-NEC. Starting with payments made in 2026, the reporting threshold is $2,000 per vendor per calendar year, up from the previous $600 threshold, under P.L. 119-21.7Internal Revenue Service. Publication 15 (2026), (Circular E), Employers Tax Guide The threshold covers services performed by anyone who isn’t your employee, including independent contractors, freelancers, and attorneys.10Internal Revenue Service. Instructions for Forms 1099-MISC and 1099-NEC (04/2025) The threshold will be adjusted for inflation beginning in 2027.
You owe a 1099-NEC to both the vendor and the IRS. The recipient copy and the paper IRS filing are both due by January 31 following the calendar year of payment. If you file the IRS copy electronically, the deadline is March 31.11Internal Revenue Service. Publication 1099 General Instructions for Certain Information Returns – 2026 Returns
The 10-Return E-File Rule
If your business files 10 or more information returns of any type in a calendar year, you must file electronically. The threshold is an aggregate across all return types, not 10 per form.12Internal Revenue Service. Topic No. 801, Who Must File Information Returns Electronically A business with a modest number of vendors and a handful of employees crosses that line quickly.
Penalties for Late or Wrong Filings
Missing the deadline or filing with incorrect information triggers per-return penalties that grow the longer you wait. For returns due in 2026:13Internal Revenue Service. Information Return Penalties
- Corrected within 30 days: $60 per return
- Corrected after 30 days but by August 1: $130 per return
- Filed after August 1 or not filed at all: $340 per return
- Intentional disregard: $680 per return, with no annual cap
These penalties apply separately for failure to file with the IRS and failure to furnish the correct statement to the vendor, so a single missed form can produce charges in both directions. Getting the W-9 right at the start of the relationship is much cheaper than working through penalty notices later.
How Long to Keep the Records
The IRS recommends keeping general business records, including vendor payment records and canceled checks, at least three years from the date you file the return reporting the payment. Employment tax records require four years.14Internal Revenue Service. Common Questions About Recordkeeping for Small Businesses If gross income is underreported by more than 25%, the IRS has six years to assess additional tax, so records should reach back at least that far when there’s any exposure.
A separate seven-year rule applies to accounting firms auditing public companies under SEC regulations, and it sometimes gets confused with the general business standard.15U.S. Securities and Exchange Commission. Retention of Records Relevant to Audits and Reviews For a business issuing its own vendor checks, the three-year IRS guideline is what applies. Digital copies are acceptable as long as they stay legible and accessible for the full retention period.
Stale Checks and Unclaimed Property
A check that sits uncashed for more than six months is stale-dated, and a bank has no obligation to honor it (though some will).4Legal Information Institute (LII) / Cornell Law School. UCC 4-404 – Bank Not Obliged to Pay Check More Than Six Months Old A stale check doesn’t erase the underlying debt. You still owe the vendor, and they can still request a replacement.
The larger concern is a vendor check that stays uncashed for years. Every state has unclaimed property laws (sometimes called escheatment laws) requiring businesses to turn dormant funds over to the state after a specified period, typically one to five years depending on the state and property type. Before you report the funds, you’re generally required to attempt to contact the vendor at the last known address, usually with a due diligence letter sent 30 to 90 days before the reporting deadline. Failing to report unclaimed property can bring state penalties and interest, and many states audit for compliance. The specifics vary enough by state that a check with your state’s unclaimed property office is worth the time.