How to Follow Up on an Unpaid Invoice
Most unpaid invoices aren't disputes — they're forgotten emails and busy inboxes. A calm, scheduled follow-up sequence collects the vast majority of overdue payments without damaging the relationship. Here's the exact playbook.
The principle: scheduled, not emotional
Follow up on a schedule, not on frustration. Decide your sequence in advance — reminder, firmer reminder, final notice — and run it the same way every time. This does two things: it removes the dread (you're just executing step two, not "confronting" anyone), and it creates a paper trail that shows you were professional throughout.
Keep every message short, factual, and forward-looking. Name the invoice number, the amount, the due date, and what you'd like them to do. Never accuse, never threaten in the early stages, and never apologize for asking to be paid — you're not doing anything wrong. If anything, a predictable sequence makes you easier to pay: the client learns that your invoices come with a process, not just a hope.
And always reply in the same thread as the original invoice. It keeps the full history in one place and subtly reminds the client this has been outstanding for a while.
Step 1 — The friendly reminder (a few days past due)
Send this 3–5 days after the due date. Assume forgetfulness, because that's what it usually is. The tone is helpful: maybe it slipped through, maybe it went to the wrong person.
Subject: Friendly reminder — invoice INV-014 ($1,200) due March 14
Hi Maya — just floating invoice INV-014 back to the top of your inbox. $1,200 for the homepage copy, due March 14. Payment details are on the invoice — let me know if you need anything from me. Thanks!
Reattach the invoice. Don't make them hunt for it. This single email resolves most overdue invoices — which is why sending it promptly matters more than perfect wording. If your invoice included clear payment terms, this reminder simply points back to what was already agreed.
Invoices that get paid
Billia's free invoice generator puts clear due dates and payment details on every invoice — so reminders are rare and short.
Create an invoice — freeStep 2 — The firm reminder (two weeks past due)
If the friendly reminder gets no response within about two weeks, escalate the tone — still professional, but direct. Reference your previous message, restate the facts, and set a clear expectation.
Subject: Second reminder — invoice INV-014 ($1,200), now 2 weeks overdue
Hi Maya — following up on my note from March 18. Invoice INV-014 for $1,200 (homepage copy) was due March 14 and is now two weeks overdue. Please confirm when I can expect payment, or let me know if there's an issue I should be aware of. Reattaching the invoice here.
The key phrase is "please confirm when I can expect payment" — it asks for a commitment, not just attention. If your terms include a late fee, this is the stage to mention that it's now accruing. And if you're dealing with a company, consider copying the accounts-payable contact — your day-to-day contact may not control payments.
Step 3 — The final notice (30+ days past due)
At 30 days overdue with no meaningful response, send a final notice. This is formal: state the total outstanding (invoice amount plus any late fees), give a firm deadline (typically 7–14 days), and state what happens next — paused work, referral to collections, or formal proceedings.
Subject: Final notice — invoice INV-014 ($1,236 incl. late fee), due within 14 days
This is a final notice regarding invoice INV-014 for $1,200, due March 14 — now 30 days overdue. Including the late fee per our agreed terms, the outstanding balance is $1,236. Please remit payment within 14 days. If payment isn't received, I'll be pausing all current work and referring this to collections.
Only state consequences you'll actually follow through on. An empty threat teaches the client that your deadlines are negotiable. For the mechanics of late fees and escalation, see our guide to handling late payments.
Invoices that get paid
Billia's free invoice generator puts clear due dates and payment details on every invoice — so reminders are rare and short.
Create an invoice — freeThe sequence is simple: friendly reminder, firm reminder, final notice — each a few weeks apart, each in the same thread, each naming the invoice, the amount, and the next step. Most overdue invoices resolve at step one. The ones that don't are exactly why steps two and three exist.
Start with an invoice that's easy to pay: create one free with Billia — clear due date, payment details included.
Frequently asked questions
How long should I wait before the first reminder?
Three to five days past the due date is the sweet spot. Same-day follow-ups feel aggressive; waiting a month trains clients that your due dates are suggestions. A prompt, polite nudge catches the genuine forgetters fast.
Should I keep working for a client with an overdue invoice?
For a first-time late payment from a good client, usually yes — with a note that you're watching the timeline. For repeat late payers, pause new work until the balance is settled, and require deposits going forward. Continuing to work while invoices pile up just increases your exposure.
When should I involve a collections agency?
After your final notice deadline passes with no payment or credible payment plan — typically 60–90 days overdue. Agencies usually take a percentage of what's recovered, so weigh the amount owed against the cost. For large balances, a lawyer's demand letter is often the step before collections.
What is dunning?
Dunning is the formal name for this whole process — the systematic sequence of reminders and notices sent to collect an overdue payment. Our glossary entry on dunning covers the term, and this article is essentially a practical dunning playbook.