Start with a straightforward, factual reminder before anything else
The first message about an unpaid invoice should be a reminder, not a demand. Send a copy of the invoice with a note that says something like: "I wanted to make sure this reached you—the invoice for [project/service] is due on [date]. Please let me know if you have any questions about it." This assumes the invoice got lost in email or was overlooked, which is true most of the time.
Keep the tone neutral and helpful. You are not accusing anyone of anything yet. The goal is to give the person a chance to pay without embarrassment. Many invoices go unpaid straightforward because they were never seen, not because the person is unwilling to pay.
Send this reminder about three to five days before the due date, or when ready after the due date passes if you did not send one earlier. Do not wait weeks to say anything—the longer you wait, the more awkward the conversation becomes.
Key Takeaways
- Your first message should be a straightforward reminder that assumes the invoice was overlooked, not ignored.
- If payment does not arrive within a week of the due date, send a second message that asks directly whether there is a problem with the invoice or the work.
- Offer a specific payment method and ask whether the person needs an invoice in a different format or has questions about the charges.
- If the invoice remains unpaid after two weeks, ask for a concrete payment date rather than continuing to remind.
- Document every message you send so you have a record if the dispute escalates.
What to do if the first reminder does not work
If a week passes and you have not heard back, send a second message. This one should be more direct but still professional. Say something like: "I have not yet received payment for the invoice dated [date]. Is there an issue with the invoice, or do you need me to resend it in a different format? Please let me know how I can help."
This message does two things: it confirms that you are waiting for payment, and it opens the door for the person to tell you if something is actually wrong—the invoice is unclear, the work was not satisfactory, or they genuinely cannot pay right now. Many payment delays happen because the person has a legitimate objection they have not voiced yet.
Include the invoice number and the amount due in this message so there is no confusion about which invoice you are discussing. If you have a preferred payment method, mention it: "You can pay by bank transfer to [account], by check to [address], or by credit card through [link]."
Ask for a specific date instead of repeating reminders
If two weeks have passed since the due date and you still have no payment or response, stop sending reminders. Instead, ask for a commitment. Send a message that says: "I have not received payment for invoice [number], dated [date], for [amount]. When can I expect this payment? Please let me know a specific date so I can update my records."
This shifts the conversation from "you owe me" to "when will you pay." It also gives you a concrete answer you can hold the person to. If they say "next Friday," you now have a date to follow up on. If they do not respond to this message, you have a clear record that you asked directly and they did not answer.
A specific date also tells you whether the person is avoiding you or genuinely in a tight spot. Someone who cannot pay right now will usually say so—"I can pay half on the 15th and the rest on the 30th"—rather than ignoring the question entirely.
What to say if the person claims they already paid
Sometimes someone will say they sent payment weeks ago. Before you accuse them of lying, check your actual bank account and payment processor. Payments can take three to five business days to clear, and some people genuinely believe they have paid when they have only submitted the payment.
If you have not received the money, ask them for proof: "I have not seen the payment in my account yet. Can you send me a screenshot of the confirmation or the transaction number? That way I can track it down on my end." This is polite and gives them a chance to show you they actually did send it.
If they cannot produce proof, say: "I have not been able to locate it. To make sure we get this sorted, can you send the payment again using [method]?" Do not accuse them of lying. Assume the payment got lost in the system, which does happen.
When to stop asking and escalate
If you have sent three separate messages over the course of three weeks and received no response and no payment, you have done what you can do politely. At this point, you have a choice: you can send one final message stating that you will pursue the debt through small claims court or a collection agency if payment is not received by a specific date, or you can write off the invoice as a loss.
The final message should be factual and unemotional: "Invoice [number] for [amount] remains unpaid as of [date]. If I do not receive payment by [date—typically 10 days out], I will pursue this debt through [small claims court / a collection agency / legal action, depending on your location and the amount]." Then follow through if they do not pay.
Before you send this message, check your local laws. Some places require you to send a formal demand letter instead of an email. Small claims court has limits on how much you can sue for—usually between $5,000 and $25,000 depending on the state—so if your invoice is larger, you may need a lawyer.
Keep a record of everything
Save every email, text message, and note about the unpaid invoice. If the dispute ends up in court or with a collection agency, you will need to show that you made a reasonable effort to collect the debt. Your record should include the original invoice, the date it was sent, the due date, and every message you sent asking for payment.
If you are communicating by phone or in person, send a follow-up email after the conversation: "Per our conversation today, you said you would send payment by [date]. I am following up to confirm." This creates a written record of what was promised.
Do not send angry or threatening messages, even if you are frustrated. Stick to the facts: what is owed, when it was due, and what you are asking for now. If the situation goes to court, a judge will see every message you sent, and professional communication works in your favor.
How to prevent unpaid invoices in the first place
The easiest way to handle an unpaid invoice is to never have one. Before you start work, agree on payment terms in writing. Say something like: "I will send an invoice on [date], and payment is due within 10 days." Get that agreement in an email or a contract so both of you have it in writing.
For larger projects, ask for a deposit upfront. This shows the person is serious about the work and gives you money to cover your costs if they disappear. For ongoing work, invoice weekly or monthly rather than waiting until the end of a long project.
Use an invoicing tool like Wave, Square Invoices, or FreshBooks if you send invoices regularly. These tools can send automatic reminders on the due date and a few days after, which takes the awkwardness out of the first follow-up. The reminder comes from the system, not from you personally.
Frequently Asked Questions
How long should I wait before sending the first reminder?
Send the first reminder three to five days before the due date, or when ready after the due date passes. Do not wait a week or more—the longer you wait, the more it looks like you forgot about it too. A quick reminder feels like a courtesy; a message weeks later feels like an accusation.
What if the person says they do not have the money right now?
Ask them for a payment plan. If they owe you $1,000 and cannot pay it all at once, ask whether they can pay $250 a week for four weeks, or $500 now and $500 in two weeks. Get the agreement in writing—an email saying "I will pay $250 on Friday" counts. Then follow up on the dates they promised.
Should I charge interest or late fees if the invoice is overdue?
Only if your original invoice or contract said you would. If you did not mention late fees upfront, adding them now will make the person angry and less likely to pay. If you want to charge interest on future invoices, include it in your terms before you send the invoice.
Can I refuse to do more work until they pay the old invoice?
Yes, and you should. If someone owes you money and wants you to start a new project, say: "I would be happy to start the new work once the outstanding invoice for [amount] is paid." This is not punishment—it is protecting yourself from doing more work for someone who has already shown they do not pay on time.
What if they dispute the invoice and say the work was not done correctly?
Listen to the complaint. If they have a legitimate point, fix the work or offer a partial refund. If you believe the work was done correctly, ask them to be specific about what is wrong. Get their objection in writing so you have a record. If you cannot agree, you may need a third party or a small claims court to decide.