To pay an invoice, do five things in order: confirm you ordered the work, match the amount to the quote or purchase order, read the due date and terms, pay through the method the invoice lists, and save the receipt. Skipping to step four is how businesses pay for things they never bought.
This is written for the person on the paying end: an office manager, a bookkeeper, an owner with a stack of bills, or someone paying a contractor for the first time. If you are the one sending the invoice, how to send an invoice covers that side.
Step 1: Confirm you asked for this
Before you open the pay link, answer one question: did we order this? Look for the quote, the email thread, or the purchase order. If you cannot find any of them, stop. Do not pay and do not reply with a question on the invoice itself. Ask the person who would have ordered it.
The Federal Trade Commission's alert from May 14, 2026, "Run a small business? Pay your bills, not scammers," describes the pattern. Scammers send bills for services nobody ordered, sometimes with a "past due" notice to create urgency, and, in the FTC's words, "they hope the person handling your company's finances will just pay the invoice." The FTC's advice is to have clear procedures for approving purchases and invoices from vendors you actually work with, and to search the company's name with words like "review," "scam" or "complaint" if you do not recognize the sender.
Step 2: Match it to the quote
Put the invoice next to the quote or purchase order and compare three things: the line items, the quantities, and the total. Most honest mistakes show up here, such as a rate that changed, a line billed twice, or a deposit already paid that was not subtracted.
Say you hired a plumber named Reyes Plumbing for a water heater swap. The quote was $1,850 with a $500 deposit. The invoice arrives for $1,850. You paid $500 two weeks ago, so the amount due is $1,350. Replying with "I paid the $500 deposit on the 3rd, so the balance is $1,350, correct?" fixes it in one message. If you want to know the difference between the two documents, read quote versus invoice.
Step 3: Read the date and the terms
Find the due date and the payment terms. "Due on receipt" means now. "Net 30" means thirty days from the invoice date, and the clock starts when the invoice is dated, not when you open it. Look for a late fee clause too, because it determines how much a week's delay costs. Terms are explained in payment terms: Net 30.
If the due date is a week away and you pay today, nothing is gained unless there is an early payment discount such as "2/10 net 30," which means a 2 percent discount if paid within 10 days. If no discount is listed, pay a day or two before the due date, not after it.
Step 4: Pay by the method on the invoice
| Method | What to check first |
|---|---|
| Pay link on the invoice | The web address should be the vendor's own domain or a payment processor you recognize. Type or open it from the vendor's site if in doubt. |
| Bank transfer (ACH or wire) | Compare the account details with the last invoice from this vendor. If they changed, call the vendor on a number you already had, not one printed on the new invoice. |
| Card | Ask whether a card fee is added. Some vendors add one, and the invoice should say so. |
| Check | Payee name spelled as on the invoice, the invoice number on the memo line, and a mailing address from the invoice. |
| Phone | Only call a number you already have. Never read card numbers to someone who phoned you. |
Changed bank details are the one to watch. A new account number with the same logo is a standard trick, and a short call to a known number costs nothing next to a wire you cannot pull back.
Step 5: Keep the receipt and tell the vendor
Save the confirmation page, the bank reference or the cancelled check image, and file it with the invoice. Send a one-line note to the vendor: "Paid invoice 1042 by ACH today, $1,350." They will thank you, because it saves them a reminder. If you work with a bookkeeper, forward the receipt there so the books match.
If the invoice looks wrong
- Amount is off. Reply with the quote number and what you expected. Pay the undisputed part if the vendor agrees to it.
- You never ordered it. Do not pay and do not click the links in it. Report fake invoices to the FTC at ReportFraud.ftc.gov, as the FTC's alert asks, and forward phishing emails to reportphishing@apwg.org.
- Work was not finished. Pay for what was done if your agreement allows, and write down what remains.
- You cannot pay on time. Write before the due date, not after. Offer a date and, if you can, a partial payment. How a vendor chases such a message is shown in how to follow up on an unpaid invoice.
A routine that stops mistakes
If you pay more than a few invoices a month, give them one weekly slot, such as Thursday at 10. Open the stack, run steps one to three on each, pay the clean ones and park the rest with a note on what is missing. One person approves, and a different person releases the payment when the amount is large. The FTC's point about clear approval procedures is the same idea at the size of a company.
From the other side of the table, this routine is why a clean invoice gets paid sooner: it matches the quote, states the terms and puts the pay link next to the total. If you send quotes and invoices yourself, Rocketship includes quotes your clients sign and pay online through Stripe, with a 1% platform fee, so the invoice already matches what they agreed to. The plans list what is included.