Write the email to the person who can actually pay

Send your payment request to the person who approved the work or signed the contract, not to a general inbox or a junior staff member. That person knows what you did, knows it was supposed to cost money, and has the authority to move a payment through their system. If you send it to accounting or a help desk, it gets routed back to them anyway—and you lose a week.

If you do not know who that person is, look at the original email thread or contract signature. If the contract was signed by a company rather than a person, call the main number and ask: "Who should I send an invoice to for work completed on [project name]?" You will get a name and often a direct email in under two minutes.

Key Takeaways

  • Send payment requests to the person who approved the work, not to a general accounting address, because they have the authority to process it.
  • Include an invoice number, the exact amount owed, what work it covers, and the date the work was completed—not the date you are asking for payment.
  • State your payment terms clearly: net 30, net 15, or due upon receipt, so there is no confusion about when the money should arrive.
  • Use a professional subject line that names the project and says "Invoice" so the email does not get lost in a crowded inbox.
  • Follow up once if you do not hear back within your stated payment window, then escalate to a phone call or a second contact if the deadline passes.

What to put in the email itself

Start with a one-sentence summary: "I have completed [project name] and am sending the invoice below." Then include the invoice as an attachment or as a table in the email body. The invoice must show: your name or business name, the client's name, an invoice number (you can use a simple format like INV-001 or INV-2024-001), the date you completed the work, the amount due, and your payment terms.

Payment terms are the deadline you are setting. Common options are "net 30" (payment due within 30 days), "net 15" (payment due within 15 days), or "due upon receipt" (payment due immediately). State this clearly: "Payment is due by [specific date]" is clearer than "net 30" alone, because it removes the math the client has to do.

Include how they should pay you. Name the method: bank transfer, check, credit card, PayPal, Stripe, or whatever you accept. If it is a bank transfer, include your account details or a link to a secure payment page. If you accept multiple methods, list them in order of your preference—bank transfer is usually fastest and cheapest for you.

The tone and length that actually gets paid

Keep the email short. Three to four sentences before the invoice, then the invoice itself. A long explanation of what you did or why you deserve the money reads as defensive and makes the client less likely to prioritize it. They already know what you did—they hired you for it.

Use a neutral, professional tone. Do not apologize for asking for money you earned. Do not use phrases like "whenever you get a chance" or "no rush"—those signal that the deadline is flexible, and flexible deadlines slip. Instead: "Payment is due by [date]" is direct and clear.

If the client is a repeat customer or a friend, you can add one sentence of warmth: "Thanks for the opportunity to work on this" or "Looking forward to working together again." But the core of the email is the invoice and the deadline, not the relationship.

Subject lines that do not get ignored

Use a subject line that includes the word "Invoice" and the project name: "Invoice for Website Redesign" or "Invoice INV-2024-001: Consulting Services." Avoid vague subject lines like "Payment Request" or "Following Up"—those get buried in inboxes. Avoid urgency language like "URGENT" or "IMMEDIATE PAYMENT NEEDED," which often triggers spam filters or makes the client defensive.

If you are following up on a late payment, change the subject line to "Past Due Invoice: [Project Name]" so the client knows immediately that this is not a new request.

When and how to follow up

If you do not hear back by the date you set, send one follow-up email. Wait three to five business days after the deadline, then write: "I have not yet received payment for invoice [number], which was due on [date]. Please let me know if you need any additional information or if there is an issue with the payment method." Keep it factual and short—no accusation, no emotion.

If the client still does not respond after five more business days, call them. Email is easy to ignore; a phone call forces a conversation. Say: "I am following up on invoice [number] for [project]. Can you tell me when I can expect payment?" If they say they did not receive the invoice, resend it immediately. If they say it is in process, ask for a specific date. If they say there is a problem, listen and solve it—do not argue.

If the payment is more than two weeks late and the client is not responding to calls or emails, you have a dispute on your hands. At that point, consider whether the relationship is worth the money and whether you need to involve a lawyer or a collections service. For small amounts, it often is not. For large amounts, it is.

Payment methods that arrive fastest

Bank transfer (also called ACH, wire transfer, or direct deposit depending on your country) is the fastest and cheapest way to receive payment. The money usually arrives within one to three business days. Credit card payments arrive instantly but cost you 2 to 3 percent in processing fees. PayPal and Stripe are similar—instant or next-day arrival, but with fees.

Check payments take seven to ten business days to clear and require you to deposit them yourself. If you accept checks, ask the client to mail it the day they receive your invoice, not the day the payment is due, so the timing works out.

If the client says they can only pay by a method you do not accept, decide whether the extra cost or delay is worth it. If they can only pay by check and you need the money in five days, that does not work—tell them so and ask for an alternative.

What to do if the client disputes the amount

If the client says the invoice is wrong or the amount is too high, do not argue in email. Call them and ask what the issue is. It might be a misunderstanding about scope (you thought you were doing X, they thought you were doing Y), a disagreement about quality, or a genuine mistake on your invoice.

If it is a scope issue, clarify what was in the original agreement. If the client is right and you made an error, correct the invoice and resend it. If the client is wrong but unhappy, you have to decide whether to negotiate, stand firm, or walk away. Email is not the place to have that conversation—a phone call or a meeting is.

If you do negotiate, send a revised invoice immediately after you agree on a new amount. Do not leave it as a verbal agreement; put it in writing so there is no confusion later.

Frequently Asked Questions

Should I send an invoice before or after I finish the work?

Send it after the work is complete and delivered. If you send it before, the client may delay payment until they have reviewed the work. If the work is a long project, you can send invoices at milestones—for example, 50 percent when half the work is done, 50 percent when it is finished. Agree on this schedule before you start.

What if the client says they need an invoice to process payment?

That is normal. Many companies cannot pay without an invoice for their accounting records. Make sure your invoice includes your business name, address, and tax ID (if you have one), the client's name and address, a description of the work, the amount, and the date. If you are not sure what format they need, ask them to send you a blank invoice template or tell you what information they require.

Can I charge a late fee if the client does not pay on time?

Only if your contract or invoice says so in advance. If you did not mention a late fee when you sent the invoice, you cannot add one later without the client's agreement. Some industries and regions allow late fees by default; others do not. Check your local business laws or ask an accountant before you add late fees to future invoices.

What if the client says they already paid but I never received the money?

Ask them for proof: a receipt, a confirmation number, or a screenshot of the transaction. If they paid by bank transfer, ask for the transaction ID and the date. If they paid by check, ask for the check number and date mailed. Then check your bank account and your email for any payment confirmation. If the money truly did not arrive, ask the client to stop payment on the original transaction (if it was a check) or reverse the transfer (if it was electronic), and ask them to pay again using a method you can both track.

Should I offer a discount if the client pays early?

You can, but it is not necessary. A small discount—2 to 5 percent—can speed up payment if cash flow matters to you. State it on the invoice: "2 percent discount if paid within 10 days." But do not offer a discount unless you can afford to take less money. Most clients will not take it anyway.