Sending an invoice late feels awkward, but the real question is whether it’s still collectible. The answer depends on your contract, the client relationship, and how long ago the work actually happened.
The legal window vs. the practical window
From a legal standpoint, statutes of limitations on written contracts typically run four to six years in the US (and similar periods in Canada and the UK). That means you technically have years to send an invoice and still have legal standing to collect.
But the practical window is much shorter. Clients who receive an invoice three months after delivery are confused, sometimes annoyed, and more likely to dispute amounts or claim the work was never completed satisfactorily. Memories fade, project files get archived, and accounting teams change.
The practical window for clean, uncomplicated invoice collection is about 30 to 60 days after delivery.
What happens when you invoice late
Sending an invoice late creates problems you don’t face when you invoice on time. The client may have already closed out the project budget in their accounting system. Their accounts payable contact may have changed. They may genuinely not remember exactly what was delivered or whether they were satisfied.
None of these make collection impossible, but all of them add friction. You will likely need to provide more documentation — the original agreement, project deliverables, communications confirming acceptance of the work.
The best time to send an invoice is the same day the work is completed. The second best time is right now, no matter how late it is.
How to handle a forgotten invoice
If you realize you forgot to invoice a client, act immediately. Send the invoice with a brief, matter-of-fact note: “Hi [Name], I realized I hadn’t sent the invoice for [project]. Apologies for the delay — please find it attached. Let me know if you have any questions.”
Keep the apology short and don’t over-explain. Excessive explanation draws attention to the gap. Most clients, when they have a clear record of the work being done, will pay without a fight.
When late invoicing becomes a real problem
If more than six months have passed since the work was completed and you have no prior invoice or payment request on record, collection becomes materially harder. At this point, gathering every piece of documentation you have — emails about the project, deliverables you sent, any written agreement — is essential before reaching out.
For very old debts, a collections attorney can assess whether it’s worth pursuing. Sometimes the practical answer is to write the loss off and learn from it.
Building a habit of same-day invoicing
The cleanest solution is to never invoice late. Using Waco, you can send an invoice immediately when a project milestone is hit — right from the same dashboard you used to manage the project. The invoice goes out while the client is still engaged with the work, which is also when they are most likely to pay promptly.
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