Write the email as a statement, not a question

The difference between "Could you possibly send payment?" and "Payment is due on [date]" is the difference between asking permission and stating a fact. Your client already agreed to pay when they accepted your work or signed a contract. The email is a reminder, not a negotiation.

Open with the specific amount, the invoice number if you have one, and the due date. Example: "Invoice #2847 for $3,500 is due by Friday, March 15." Then add one sentence about where to send it and how. That is the entire first paragraph. Do not apologize for asking. Do not soften it with "when you get a chance" or "if it's not too much trouble."

Include the invoice as an attachment or link, never as a description

Do not write out line items in the email body. Attach the actual invoice document or send a link to it. This serves two purposes: it gives your client the formal record they need for their own accounting, and it removes any ambiguity about what they are paying for.

If you are sending a link, make sure it works before you send the email. Test it from a different browser or device. A broken link makes you look disorganized and gives the client an excuse to delay. If you are attaching a PDF, name it clearly: "Invoice_2847_March2024.pdf" rather than "invoice.pdf" or "final_final_v2.pdf".

Key Takeaways

  • State the payment amount and due date in the first sentence as a fact, not a question or request.
  • Attach or link to the actual invoice document so your client has the formal record they need.
  • Send the payment request email separately from project updates or other messages, so it does not get lost in conversation.
  • Include your payment methods and instructions in every payment email, even if you have sent them before.
  • Follow up three to five business days after the due date with a single, direct message; do not send multiple reminders in quick succession.

Send the payment email as its own message, not buried in a thread

If you are in the middle of a back-and-forth about the project, do not tack the payment request onto the end of an email about deliverables or revisions. Send it as a separate email with a subject line that says what it is: "Invoice #2847 Due March 15" or "Payment Request for [Project Name]".

This matters because payment emails get handled differently than project emails. Your client may forward the invoice to their accounting department, file it separately, or set a calendar reminder. Burying it in a conversation thread means it gets lost when the thread scrolls down or when the client switches devices.

State your payment methods and the exact steps to pay

Do not assume your client remembers how you want to be paid. Include the method every time: bank transfer, PayPal, check, credit card, or whatever you accept. If it is bank transfer, include your account details or a link to your payment page. If it is check, include your mailing address. If it is PayPal or Stripe, include the link.

Write out the steps in order. Example: "To pay by bank transfer, use the details below. Please include Invoice #2847 in the memo line so I can match the payment to your account." The memo line detail matters because it helps you reconcile the payment later, especially if you have multiple clients paying around the same time.

Follow up once, three to five business days after the due date

If payment has not arrived by the due date, send one follow-up email three to five business days later. Do not send it the day after the due date—clients often pay a few days late without it being a problem. Do not send multiple reminders in quick succession; that reads as panic and damages the relationship.

The follow-up email should be brief and direct: "I have not yet received payment for Invoice #2847, due March 15. Please send payment by [new date] or let me know if there is an issue." If there is a genuine problem—the client is disputing the invoice, has cash flow trouble, or did not receive the first email—this gives them a clear opening to say so.

Know when to stop emailing and pick up the phone

If the follow-up email gets no response and the payment is now more than two weeks overdue, email is no longer the right tool. Call the client or ask to speak with their accounts payable contact. A five-minute phone call often resolves what three emails cannot.

Before you call, have the invoice number, amount, and original due date in front of you. Be direct: "I am following up on Invoice #2847 for $3,500, which was due March 15. I have not received payment or heard back. Can you tell me what is happening?" Listen for the real reason—sometimes it is a processing delay, sometimes the invoice went to the wrong department, sometimes the client genuinely forgot. Once you know the reason, you can solve it.

Adjust your approach if the client is a repeat customer or a large account

If this is a client you work with regularly or a large contract, the tone can shift slightly. You might say "I wanted to check in on Invoice #2847" instead of "Payment is due." The substance is the same—you are asking for money—but the relationship context changes how you phrase it.

For repeat clients, you can also build payment into your workflow earlier. Send the invoice the same day you deliver the work, not a week later. If you have a contract, specify payment terms in writing: net 15, net 30, or payment upfront. The clearer the terms are before work begins, the fewer payment conversations you have to have later.

Frequently Asked Questions

Should I apologize for asking for payment?

No. You completed the work. The client agreed to pay. Apologizing makes you sound uncertain about your own value and gives the client permission to delay. Be direct and professional instead.

What if the client says they did not receive the invoice?

Resend it when ready, this time to both the person you have been working with and their accounts payable contact if you can find it. Ask them to confirm they received it. If they claim they never got the first one, do not argue—just resend and move forward.

How long should I wait before following up?

Wait three to five business days after the due date. Waiting longer than a week signals that you are not serious about being paid. Sending a follow-up the day after the due date signals that you do not understand how business accounting works.

Can I charge a late fee if payment is overdue?

Only if your contract or invoice states the late fee upfront. If you did not mention it before the work began, you cannot add it after. If you want to charge late fees going forward, include that language in your contract or on your invoice template.

What should I do if a client refuses to pay?

That is a dispute, not a payment request. You will need to decide whether to pursue it through small claims court, accept a partial payment, or write it off. Before you reach that point, have a direct conversation about why they are refusing—sometimes there is a legitimate quality issue you can fix.