An invoice past its due date is not an emergency, but it does need a plan.
A past due invoice is any invoice your client has not paid by its due date. What you do next depends on how late it is: a light nudge on day one, a firmer email by day fourteen, and a written demand if forty-five or sixty days pass with no payment and no explanation.
What a past due invoice actually means
Past due, overdue and delinquent often get used as if they mean the same thing, but they mark different points on the same timeline. A past due invoice is simply unpaid after its due date; nothing else has to be true yet. An overdue invoice is the same idea in plainer language, usually while it is still only a few days late. Delinquent tends to show up later, once nonpayment has gone on long enough that you are weighing a demand letter or another form of collection.
None of these are legal terms with a fixed deadline attached to them. They describe how you and your client are likely talking about the invoice at that point, not a status your accounting software assigns on its own.
A day-by-day plan for a past due invoice
Most freelancers do not need a complicated process, just a plan they actually follow. Use the timeline below as a default and adjust the pace for a client you already trust versus one you are less sure about. Each overdue invoice reminder should read a little firmer than the last one, not just a repeat of the same message. If you are not certain exactly when an invoice became due, a free net 30 calculator can confirm the date before you send anything.
Day 1
Send a friendly reminder
A short, polite note that assumes the invoice was simply missed. No mention of consequences yet.
Day 3
Confirm it arrived
If there is no reply, ask whether the invoice was received and whether anything is blocking payment.
Day 7
Follow up by a second channel
Email again, and consider a short text or a phone call if that fits how you and this client usually talk.
Day 14
Send a firmer reminder
State the amount, the original due date, and a specific date you would like payment by.
Day 30
Send a firm final reminder
Mention a late fee here if one is in your contract, and make clear this is your last reminder before a formal written demand.
Day 45
Send a written demand
A formal, dated request for payment, sent in a way you can prove you sent it.
Day 60+
Decide on escalation
Weigh a collection agency or small claims court against the time, cost and the relationship you have left.
What to say when an invoice is overdue
Here is what to say when an invoice is overdue, whether the conversation happens over email or on the phone. Keep the first message plain and assume good faith: state the invoice number, the amount, and the date it was due, then ask a direct question.
| Channel | What to say |
|---|---|
| Hi [Client name], just checking in on invoice [Invoice number] for [Amount], which was due on [Due date]. Could you let me know where it stands? | |
| Phone | Hi [Client name], I wanted to check on invoice [Invoice number]. Has that gone through on your end yet? |
Past due invoice reminder templates
Copy either template below and adjust the specifics. Both work as email; the day 14 version also works as a short text if that fits how you and this client usually talk. A good unpaid invoice reminder stays factual instead of frustrated, even on the second or third try. For more stages in between, see the overdue invoice email templates.
When to send: The day after the due date, before anything else
Subject: Invoice [Invoice number] – just checking in
Hi [Client name],
Just a quick note that invoice [Invoice number] for [Amount] was due on [Due date]. It's possible this slipped through, so no worries if it is already on its way.
Let me know if you need anything from me, like a copy of the invoice or the payment link again.
Thanks, [Your name]
Why it works: it assumes good faith, gives the client an easy way to say "sent already," and asks for nothing beyond a status update.
When to send: Two weeks after the due date, if there has been no reply
Subject: Invoice [Invoice number] is now two weeks past due
Hi [Client name],
Invoice [Invoice number] for [Amount] was due on [Due date] and is now two weeks past due. I have not heard back from my last note, so I wanted to check directly: is there anything holding up payment on your end?
If it's easier, you can pay using [Payment link]. If there's a dispute or a delay I should know about, please tell me and we will sort it out.
I'd like to get this resolved by [New date].
Thanks, [Your name]
Why it works: it states the facts plainly, offers an easy way to pay, and gives a specific date without threatening anything you are not ready to do.
When an invoice is 30, 60 or 90 days overdue
The stakes change the longer an invoice goes unpaid, even when your wording does not change much.
| Stage | What it usually means | What to do |
|---|---|---|
| 30 days overdue | One or two reminders have not worked yet. | Send a firm final reminder, and mention a late fee if one is in your contract. |
| 60 days overdue | This is no longer a simple oversight. | If you have not already sent a written demand around day 45, send one now, with a hard deadline. |
| 90 days overdue | The odds of collecting the full amount without help start to drop. | Weigh a collection agency, small claims court, or writing off the amount. |
Exactly where you stop waiting is a judgment call. It depends on the size of the invoice, how much you value the relationship, and how much your time chasing it is worth.
Late fees and interest on a past due invoice
Only charge a late fee or interest if you and your client agreed to it in writing beforehand, in your contract, your proposal, or the payment terms printed on your invoice. Adding a fee after the fact, with nothing in writing, tends to create a new argument instead of getting you paid faster. See payment terms for how to set this up before your next invoice goes out.
In the UK, if you are invoicing another business, the Late Payment of Commercial Debts (Interest) Act 1998 gives you the right to charge statutory interest even without a clause in your contract. GOV.UK states that the rate is "8% plus the Bank of England base rate" for business-to-business transactions (accessed September 28, 2026). On top of that interest, GOV.UK's page on claiming debt recovery costs says you can charge a small fixed sum toward the cost of recovering the debt, with the exact amount set by how much you are owed (accessed September 28, 2026).
In the United States, rules on late fees and interest are set at the state level and vary widely, so there is no single national rate to quote here. Check your own state's law, or a local attorney, before adding interest that was not agreed upfront.
When to escalate a past due invoice
Escalation means moving from asking to a more formal step: a demand letter, a collection agency, or small claims court. Consider it once you have sent a few reminders with no real response, once a client stops answering altogether, or once the amount is large enough that the time and stress of pursuing it are worth it to you.
If reminders alone have not worked, walk through your options for an unpaid invoice in order, starting with a payment plan and ending with legal action. Many people send a demand letter for an unpaid invoice before anything more formal, since it is inexpensive and often enough on its own.
Small claims court is the most common way to pursue a past due invoice yourself, without a lawyer. Limits on how much you can sue for vary by state; in small claims in California, for example, you can sue for up to $12,500 as an individual, or up to $6,250 if you are suing as a business (accessed September 28, 2026). Check your own state court's self-help pages for the limit and forms where you live.
How to prevent the next past due invoice
Most of this comes down to what happens before you ever send the invoice. Clear payment terms, stated upfront, remove a lot of the ambiguity that turns into a past due invoice later. A deposit before you start work, and progress payments on longer projects, also mean less money is riding on any single invoice at the end.
A payment reminder before the due date heads off a lot of late payments before they happen at all. It is also worth getting comfortable with how to ask a client for payment in a way that feels natural, so you are not improvising the first time an invoice runs late.
Frequently asked questions
What does past due mean on an invoice?
An invoice is past due the moment its due date passes without payment, even by a single day. If your terms say net 30, day 31 is past due. If the invoice says due on receipt, the day after your client received it counts. Being past due does not necessarily mean anything has gone wrong. It often just means the invoice was set aside and needs a nudge, which is why the first reminder should stay light and assume good faith rather than open with a complaint.
How do you politely tell a client their invoice is overdue?
State the facts without adding blame: the invoice number, the amount, and the date it was due. Ask a direct, open question, such as whether the invoice was received or whether anything is holding up payment, rather than assuming they are ignoring you. Keep the first message short and make it easy to act on, for example by including the payment link again. Save firmer wording for later reminders if the first one or two get no response at all.
How long can an invoice be past due before you take action?
There is no fixed rule, but most freelancers send a first reminder within a few days of the due date, a firmer one around two weeks, and treat thirty days as their last reminder before anything more formal. Forty-five to sixty days overdue is when a written demand is common, and sixty to ninety days overdue is when a collection agency or small claims court become realistic. How long you actually wait should depend on the size of the invoice, how much you trust the client, and how much the relationship is worth to you.
Can you charge a late fee on a past due invoice?
Only if you and your client agreed to it beforehand, usually in your contract or in the payment terms printed on the original invoice. Adding a fee after the fact, with nothing agreed in writing, tends to create a new argument instead of getting you paid. In the UK, business-to-business invoices carry a statutory right to interest even without a contract clause; see the late fees section on this page for the source. In the US, rules vary by state, so check your own state's law before adding one.
Should you stop work while an invoice is past due?
That depends on your contract and how much risk you are comfortable carrying. Many freelancers pause new work once an invoice is thirty or more days past due, especially on ongoing engagements, while finishing anything already promised on a project that has already been delivered. If you are mid-project, weigh the cost of stopping against the cost of falling further behind on payment. Whatever you decide, say it plainly to the client rather than letting delivery quietly slow down with no explanation.