You finished the project weeks, or months, ago and never sent the invoice. Or you sent it on time and the client still hasn't paid. Both situations get called "late invoicing," and both cost you money. The good news is that in most cases a late invoice is still a valid invoice. The bad news is that the longer you wait, the harder it gets to collect.
This guide answers the question most people actually search for: how late can you send an invoice? It covers the rules in the US, UK and EU, what happens when a client refuses to pay, and how to send an overdue invoice without making things awkward.
This article is general information, not legal advice. Rules depend on your location, your client's location and your contract. For a specific dispute, talk to a local attorney or solicitor.
Key takeaways
In the US, there's usually no legal deadline to send an invoice. The practical limit is your contract and your state's statute of limitations, commonly 3 to 6 years, with some states allowing 10.
In the UK, VAT-registered businesses normally must issue a VAT invoice within 30 days of the supply, and debt claims are generally time-barred after 6 years (5 in Scotland).
Your contract can set a stricter deadline for invoicing. Read it before assuming you have years.
A late invoice is still valid, but it's easier to dispute and may fall outside the client's budget. Send it as soon as you notice, with a short apology and the original details.
When the client is the one paying late, agreed late fees and, in the UK and EU, statutory interest can help you recover the cost.
Two kinds of late invoicing
Sending an invoice late means you delayed billing after finishing the work. It's usually caused by being busy, not having an invoicing routine, or waiting for "the right moment." The fix is on your side.
Being paid late means you invoiced on time, but the client missed the due date. That's covered by late payment rules, late fees and follow-up, which we cover further down.
How late can you send an invoice?
United States
There's generally no federal law that sets a deadline for sending an invoice for freelance or business services. What limits you in practice is:
Your contract. Many client contracts and vendor policies say invoices must be submitted within a set number of days after the work, or by a certain date. If you miss a contractual deadline, the client may have grounds to refuse or delay payment. Check before you assume you have time.
The statute of limitations. If the client won't pay and you need to go to court, you must file within your state's limitation period for contract claims. Most states allow 3 to 6 years, and some allow 10. Oral agreements often get less time than written ones. In California, for example, you have 4 years on a written contract and 2 years on an oral one.
State freelancer laws. New York State's Freelance Isn't Free Act (in effect since August 28, 2024) covers freelancers paid $800 or more. It requires a written contract that includes the date by which you must submit your list of services rendered, which is effectively your invoicing deadline, and the date payment is due. If the contract sets no payment date, the client must pay within 30 days after you complete the work.
The limitation clock usually runs from when the client breached the agreement (for example, failed to pay when payment was due), not from when you happened to send the invoice. Don't treat it as a target. It's the point after which collecting through the courts may no longer be possible.
United Kingdom
No general deadline for non-VAT invoices. If you're not VAT-registered, there's no statutory deadline to issue an invoice, but your contract may set one.
VAT invoices: 30 days. If you're VAT-registered and make a standard- or reduced-rated supply to another VAT-registered business, you normally must issue a VAT invoice within 30 days of the date of supply.
Limitation periods. Most debts become unenforceable through the courts after 6 years in England, Wales and Northern Ireland, and 5 years in Scotland.
European Union
Invoicing deadlines in the EU are mostly set by each country's VAT and commercial law, so check the rules where you're registered. What's harmonized across the EU is how long clients have to pay: under the Late Payment Directive (2011/7/EU), businesses must pay within 60 days unless they expressly agree otherwise and the term isn't grossly unfair, and public authorities within 30 days (60 in exceptional cases). The European Commission proposed a stricter regulation with a 30-day cap in 2023, but it's blocked in the Council, so the directive still applies.
Can a client refuse to pay a late invoice?
If the work was agreed and delivered, a client generally can't refuse to pay just because the invoice arrived late, as long as you're still within the limitation period. A few situations change that:
Your contract has an invoicing deadline and you missed it.
The amount or scope is unclear, and after months nobody remembers exactly what was agreed.
The client's budget has closed. Many companies budget per project or per year. A very late invoice may need extra approval, which slows things down even when they agree they owe you.
That's why it pays to send the invoice as soon as you notice, with enough detail that the client can approve it without digging through old emails.
How to send an invoice late (without making it awkward)
Send it now. Waiting for a "better time" only makes it worse.
Reference the original agreement. Include the project name, delivery date and the price you agreed, so there's nothing to rediscover.
Itemize clearly. List what you delivered, line by line, so the client can approve it without digging through old emails. Our free invoice generator or freelance invoice template gives you the layout, and our guide to itemized invoices covers the wording.
Give a fair due date. Use your normal terms from today, not from when you finished the work.
Don't add late fees. The delay was yours, so don't penalize the client for it.
Keep the email short and friendly.
Here's a template you can adapt:
Subject: Invoice #2026-017 for [project name], delivered [date]
Hi [Name],
I'm sorry this is late. I've just realized I never sent the invoice for [project], which I delivered on [date]. It's attached, and it matches the [quote/agreement] from [date]: [total].
I've set the due date to [date] so you have the usual time to process it. Let me know if you need anything else from me, such as a PO number.
Thanks again for the project,
[Your name]
When the client pays late: your rights and late fees
If you invoiced on time and the client missed the due date, these rules can help.
Agree late fees up front. A late fee is easiest to enforce when it's in your contract and on every invoice. Clear wording looks like this:
"Payment is due within 14 days of the invoice date. Late payments incur a fee of [X]% per month on the outstanding balance, as set out in our agreement."
Work out a fair amount with our late fee calculator. In the US, limits on late fees and interest depend on your state, so keep them reasonable.
UK: statutory interest and recovery costs. Under the Late Payment of Commercial Debts (Interest) Act 1998, you can claim interest on late business-to-business payments at 8% plus the Bank of England base rate, unless your contract sets a different rate. You can also charge a fixed sum for recovery costs, once per payment:
Amount of debt | Fixed recovery charge |
|---|---|
Up to £999.99 | £40 |
£1,000 to £9,999.99 | £70 |
£10,000 or more | £100 |
If no payment date was agreed, a payment counts as late 30 days after the customer gets the invoice or you deliver the work, whichever is later. Agreed terms must usually be within 60 days for business transactions and 30 days for public authorities. A new Small Business Protections Bill, introduced in Parliament on 19 May 2026, would cap business payment terms at 60 days and make statutory interest mandatory, but it isn't in force yet.
EU: statutory interest. The Late Payment Directive gives businesses an automatic right to interest of at least 8 percentage points above the European Central Bank's reference rate, plus a minimum of €40 in compensation for recovery costs.
How to follow up on overdue invoices
Day after the due date: a short, friendly reminder with the invoice attached or linked. Our friendly reminder email examples have wording you can copy.
About a week overdue: a firmer note restating the amount, the due date, and any late fee in your terms.
Two to three weeks overdue: call the client, or send a formal notice of what happens next.
Still unpaid: consider a formal demand letter, small claims court, or a collection agency, and get legal advice for larger amounts.
For more on tone and timing, see our guide on how to remind someone to pay you.
How to stop invoicing late
Invoice on delivery. Make sending the invoice part of handing over the work.
Set a fixed invoicing day for ongoing clients, such as the last Friday of each month.
Bill long projects in milestones so you're never sitting on months of unbilled work.
Track time as you go if you bill hourly, so the invoice is quick to build. Our roundup of time tracking apps for freelancers can help you pick one.
Keep every invoice and its status in one place, so nothing slips through.
That last point is where a simple invoicing tool helps. In Onigiri, you can see at a glance which invoices are drafts, sent, overdue or paid, so an unsent draft is hard to miss. Invoices go out by email, as a shareable link or as a PDF, and when a client pays by card the status changes to Paid automatically. The free plan covers 3 invoices a month, no credit card required. Try Onigiri free.
