A remittance check is a business check mailed with an attached stub, called a remittance advice, that lists every invoice the payment covers, every deduction taken, and the math that produced the final dollar amount. Companies use it in business-to-business transactions when one payment settles several outstanding invoices at once, because an ordinary memo line can’t carry that much detail. Paper versions are declining as electronic payments take over, but they remain common enough that anyone in accounts payable or receivable needs to know how they work.1Nacha. Over 21 Years, a Massive Drop in B2B Check Payments, Study Finds
What the Remittance Advice Shows
The advice is a line-by-line breakdown of how the payer arrived at the total on the check. At minimum, it lists every invoice number being paid, the original amount of each invoice, and any adjustments applied to that amount.
Those adjustments are the reason a plain check won’t do. Common ones include early-payment discounts, returned-merchandise credits, negotiated price reductions applied after the original invoice, and volume rebates. If a supplier offers “2/10 Net 30” terms, the buyer earns a 2% discount for paying within 10 days of the invoice date. Take the discount, and the advice shows the original invoice amount, the 2% reduction, and the resulting net figure. The check amount matches the sum of all those net figures across every invoice listed.
The advice also typically identifies the payer’s account number, the payment date, and reference numbers for any credit memos that apply. When a $47,312 check arrives covering seven invoices with three different deductions, the advice is the document that explains the number.
How the Payment Gets Processed
On the Payer’s Side
The process starts in accounts payable. The AP team batches all invoices due for a vendor, applies any authorized deductions, and generates the check and the advice together. Modern AP software handles this automatically so the two totals match down to the penny. Before the check goes out, the payer’s system records the payment against the corresponding payable balances, creating an internal audit trail.
On the Payee’s Side
When the payment arrives, the first step is separation. The check goes to whoever handles bank deposits. The advice goes to the AR reconciliation team. These paths are deliberately kept apart as a basic internal control: the person depositing funds shouldn’t be the person deciding which invoices to clear.
The AR clerk works through the advice line by line, matching each listed invoice to the corresponding open balance in the accounting system. Every deduction gets verified. If the payer claimed a 2% early-payment discount, the clerk checks whether the payment actually arrived within the discount window. If it did, the invoice clears at the reduced amount. If it didn’t, the clerk records a short payment and creates a small follow-up receivable for the difference, flagged for the payer’s AP department.
Most disputes surface here. A payer might apply a credit memo that was never authorized or take a discount that expired two days earlier. The advice makes these discrepancies visible immediately rather than letting them fester as unexplained variances at month-end close.
Lockboxes for Companies Receiving Many Checks
Companies that receive large numbers of remittance checks rarely process the mail in-house. They use a bank lockbox service instead. Customers mail payments to a dedicated post office box controlled by the bank, which opens the envelopes, scans the checks and advice documents, deposits the funds, and transmits digital images and payment data to the company through an online portal.2J.P. Morgan. Bank Lockbox Services: How They Work and the Benefits
Remittance checks almost always flow through a wholesale lockbox, which handles low-volume, high-dollar B2B payments and provides the document imaging and reporting suited to complex remittance data. Retail lockboxes exist for high-volume, low-dollar consumer payments like utility bills, which is a different problem.2J.P. Morgan. Bank Lockbox Services: How They Work and the Benefits
The lockbox doesn’t eliminate the AR clerk’s work. It accelerates it. Instead of waiting for the mailroom to sort envelopes and physically walk documents across the building, the AR team receives scanned images the same day the bank processes the mail. That tighter turnaround matters when discount windows are measured in days.
The Electronic Equivalent
Paper remittance checks are being replaced by electronic equivalents. B2B ACH volume climbed 155% between 2015 and 2024, reaching 7.4 billion payments worth $58.2 trillion.1Nacha. Over 21 Years, a Massive Drop in B2B Check Payments, Study Finds Electronic remittance advice (ERA) delivers the same information as a paper stub in a format that feeds directly into accounting software.
Two ACH formats carry remittance data:
- CCD+ (Cash Concentration or Disbursement Plus) supports a single addenda record attached to the payment. It fits simple payments where one invoice is being settled or the remittance detail is minimal.
- CTX (Corporate Trade Exchange) supports up to 9,999 addenda records per payment, built for complex multi-invoice settlements with detailed remittance data.3Nacha. ACH File Details – ACH Guide for Developers
CTX is the electronic equivalent of a fat remittance advice stub. It can carry full ANSI X12 messages, so the payment and the remittance travel together through the banking system as a single transaction.3Nacha. ACH File Details – ACH Guide for Developers The EDI 820 transaction set is the standard format for those messages, specifying how invoice numbers, adjustment codes, and payment amounts are structured so both sides’ systems can read them automatically.
The practical gain is speed and accuracy. With paper, an AR clerk keys each line from the advice into the accounting system. With ERA, the data imports directly, invoices clear automatically, and the only human involvement is reviewing exceptions.
Fraud Risks and Positive Pay
Remittance checks carry the same fraud risks as any paper check, plus a few specific to the format. FinCEN analyzed a six-month period and found that check fraud related to mail theft alone generated more than $688 million in suspicious activity.4FinCEN. FinCEN Issues In-Depth Analysis of Check Fraud Related to Mail Theft Remittance checks are attractive targets because they tend to be high-dollar.
The most effective defense is Positive Pay, a service offered by most commercial banks. Your company uploads a file of every check it issues, including check number, dollar amount, and payee. When a check is presented for payment, the bank compares it against your file. If anything doesn’t match, the bank flags it as an exception and contacts you before paying. Nothing clears unless you approve it. That catches altered amounts, forged numbers, and unauthorized duplicates before the money leaves your account.
On the receiving side, a fabricated or intercepted advice can be used to trick an AR clerk into posting a payment that doesn’t actually exist, masking a shortfall until the next bank reconciliation. Keeping the deposit function separate from the reconciliation function, and requiring that all posted payments reconcile against actual bank deposits within 24 hours, limits the damage.
How Long to Keep the Records
Both the check and the advice are business records you need to retain for tax and audit purposes. The IRS generally requires financial records to be kept for at least three years from the date you file the return that includes those transactions. If you underreport income by more than 25%, the retention period extends to six years. Employment tax records must be kept for at least four years.5Internal Revenue Service. How Long Should I Keep Records
Most businesses keep remittance documentation for seven years as a conservative default, which covers the longest standard IRS lookback period for bad debt deductions and worthless securities claims.5Internal Revenue Service. How Long Should I Keep Records Electronic records serve the same purpose as paper, but your archiving system has to be able to produce them in a readable format years later. A database backup nobody can query isn’t really a record.
When Paper Still Makes Sense
Given the move toward electronic payments, you might wonder why anyone still uses paper remittance checks. The answer is usually one of three things: the vendor can’t accept ACH, the company’s accounting system doesn’t support ERA, or institutional inertia hasn’t been overcome. Smaller suppliers in particular may lack the infrastructure to process CTX transactions with embedded remittance data, so a paper check with a clear advice stub stays the most reliable way to communicate payment details.
Remittance checks also persist in industries with complex deduction cultures, where returns, allowances, and chargebacks are routine and the negotiation happens partly through the advice itself. The advice isn’t just a record of what was paid; it’s a communication tool. An AR clerk reading it learns not just the amounts but the payer’s position on disputed items. That back-and-forth is harder to replicate in a fixed-format EDI message, though not impossible with the right setup.
For anyone still issuing or receiving these payments, the fundamentals hold: generate the check and advice together, separate them on receipt, verify every deduction, and reconcile against the bank deposit. Getting those steps right matters more than the format the payment travels in.