Start with a clear subject line and state what you want upfront
Your subject line should name the invoice number or the work it covers, not "Payment Due" or "Invoice Attached". Use something like "Invoice #2847 – Web Design Services" or "Payment Request for October Consulting". This tells the recipient exactly what the email is about before they open it.
In the first sentence, say what you need: "I'm writing to request payment for Invoice #2847, due on December 15." Don't bury the ask in a paragraph. The person reading your email may be scanning quickly, and you want them to know immediately whether this is something they need to act on.
If this is a follow-up to an overdue invoice, lead with that fact too: "Invoice #2847 was due on December 15 and remains unpaid. I'm requesting payment by [date]." Directness here is not rude—it's professional and saves everyone time.
Key Takeaways
- Use a specific subject line that includes the invoice number or project name so the recipient knows what the email is about at a glance.
- State the amount owed, the invoice number, and the original due date in the opening sentence or first paragraph.
- Include a copy of the invoice itself, either as an attachment or a link, so the recipient can see the itemized charges without asking you for it again.
- Set a clear new deadline for payment and explain what happens if payment is not received by that date (late fees, suspension of services, or collection action).
- Keep the tone professional and factual, even if the invoice is overdue—anger or sarcasm makes payment less likely, not more.
Include the invoice number, amount, and original due date in the body
After your opening sentence, add a short paragraph with the details. It should look like this: "Invoice #2847 for $3,500 was due on December 15, 2024. The invoice covers web design services completed in November." This gives the recipient everything they need to find the invoice in their own records and match it to a purchase order or budget line if they need to.
If the invoice is overdue, state how many days late it is: "This invoice is now 30 days overdue." This is factual, not accusatory, and it signals that you are tracking the payment and expect action.
Attach or link to the invoice so they don't have to ask for it
Include the actual invoice document in your email as a PDF attachment, or provide a direct link to it if you use invoicing software like FreshBooks, Wave, or QuickBooks. Do not assume they have it. Even if you sent it weeks ago, they may have deleted it, filed it somewhere they can't find, or passed it to a different person in their accounting department.
If you attach it, mention it in the email: "The invoice is attached." If you link to it, make the link obvious: "You can view and download the invoice here: [link]." Either way, remove one barrier to payment by making the document immediately available.
Set a specific new deadline and state the consequences
Don't just ask for payment "soon" or "at your earliest convenience". Name a date: "Please remit payment by January 10, 2025." A specific deadline creates urgency and gives you a clear point at which to take the next step if payment doesn't arrive.
If this is a first request, the deadline can be 5 to 10 business days out. If the invoice is already overdue, the deadline should be shorter—3 to 5 business days—and you should state what happens next: "If payment is not received by January 10, I will add a late fee of $X per day" or "I will pause work on your project" or "I will refer this to a collection agency." Be specific about the consequence so the recipient understands this is not a casual request.
Offer a payment method and make it easy to pay
Tell them how to pay. List every method you accept: "You can pay by bank transfer, credit card, check, or PayPal." Include the specific details they need—your bank account number and routing number for transfers, your PayPal address, your mailing address for checks, or a link to your payment portal. The easier you make it to pay, the faster they will.
If you accept credit card payments through a service like Stripe or Square, include a direct payment link so they can pay in one click. If you require a check, provide your full mailing address and the name the check should be made out to.
Keep the tone professional, even if you're frustrated
An overdue invoice is frustrating, but an angry or sarcastic email makes the recipient less likely to prioritize your payment, not more. Stick to facts: the amount, the date it was due, the date it is now, and what you need them to do.
Avoid phrases like "As you may recall" (implies they forgot on purpose), "I'm sure this is just an oversight" (sounds passive-aggressive), or "I shouldn't have to send this reminder" (makes it about you, not about getting paid). Instead, use neutral language: "I have not yet received payment for Invoice #2847. Please remit the amount by [date]."
If you have a good relationship with the payer and suspect a genuine mix-up, you can soften the tone slightly: "I wanted to check in on Invoice #2847. I haven't received payment yet. Is there anything you need from me to process it?" But even this version is direct and asks for action.
Follow up in writing if payment doesn't arrive by the deadline
If the deadline passes with no payment, send a second email. Reference your previous request and the missed deadline: "On [date], I requested payment for Invoice #2847 by January 10. That deadline has passed and I have not received payment." Then repeat the amount, the deadline, and the consequence.
Keep follow-up emails brief and factual. You are not renegotiating or asking permission—you are documenting that the invoice is overdue and stating what happens next. If you said you would add a late fee, add it. If you said you would pause work, pause it. Following through on your stated consequences is what makes future payment requests taken seriously.
Frequently Asked Questions
Should I send the payment request email or make a phone call first?
Email first. A written record protects you if the payment dispute escalates, and it gives the recipient time to find the invoice and process the payment without the pressure of a live conversation. If the invoice is significantly overdue or the amount is large, a phone call after the email is reasonable—but always follow up with an email that references what you discussed.
What if the person who owes me money says they already paid?
Ask them to send you proof: a bank statement showing the transfer, a check number and date, or a receipt from your payment processor. If they claim they mailed a check, ask for the date and amount so you can search your records. If you genuinely did not receive it, you can then investigate with your bank or ask them to stop payment and reissue. Document everything in writing.
Can I charge a late fee if the invoice is overdue?
Only if your original invoice or contract stated that late fees would apply. If you did not mention late fees upfront, adding one now may create conflict. You can mention it in a follow-up email as a consequence of further delay, but be clear that you are introducing it as a new policy going forward, not retroactively charging it on the current invoice.
How many times should I follow up before I stop asking?
Send a payment request email, then a follow-up email 5 to 10 days after the deadline if payment hasn't arrived. If that goes unanswered, a third email stating that you will refer the debt to a collection agency or pursue legal action is reasonable. After that, you have documented the debt thoroughly and can move to formal collection or small claims court if the amount justifies it.
Should I apologize for sending a payment reminder?
No. You provided a service or product and invoiced for it. Requesting payment is your right, not something you need to apologize for. Apologizing weakens your position and suggests you are uncertain about whether the debt is legitimate. Stay professional and direct.