Most unpaid invoices are not refusals. They are forgotten. The client meant to pay, the invoice got buried in their inbox, life happened. A polite reminder solves it nine times out of ten. The trick is sending the right reminder at the right point in the cycle.
Here is the cadence I use for my own freelance work. Three emails. Each one is calm but each one moves the conversation forward.
Day 1 overdue: the gentle nudge
One day past the due date. Assume forgetfulness, not malice. Keep it short and friendly. Do not apologise for sending it. You are owed money.
Email template — day 1
Subject: Invoice INV-0042, quick reminder
Hi [Name],
Hope you are well. Just a quick reminder that invoice INV-0042 for $X,XXX was due yesterday. I have re-attached a copy in case the original got buried.
No worries at all if it is already in motion on your side. Let me know either way.
Thanks,
[Your name]
Day 7 overdue: slightly firmer
A week in. They have had the friendly reminder. If it is still unpaid, something else is going on. The wrong AP contact got it, an internal approval is stuck, the invoice has a typo their system rejected, or the day-1 email landed in spam. Time to find out.
Email template — day 7
Subject: Invoice INV-0042, now 7 days overdue
Hi [Name],
Following up on invoice INV-0042 (attached), now a week past due. Could you let me know where it stands? If there is another contact at [Company] who handles AP, I am happy to email them directly.
If there is an issue with the invoice itself, please tell me and I will get it sorted today.
Thanks,
[Your name]
The "is there another contact" line usually unsticks things. Corporate AP teams do not mind being copied in directly; in fact it normally gets your invoice off the desk of an overloaded primary contact and into the system that actually pays things.
Day 30 overdue: escalation
A full month past due. Two reminders have gone unanswered. This is where the tone shifts from deferential to professional and matter-of-fact. State the consequences clearly. Still polite, no longer apologetic.
Email template — day 30
Subject: Invoice INV-0042, 30 days overdue, action required
Hi [Name],
Invoice INV-0042 is now 30 days past due. I have sent two prior reminders without response.
Per the terms of our engagement, late fees of 1.5% per month begin accruing on the outstanding balance starting today.
I would like to resolve this before it escalates further. Please confirm a payment timeline by [date, five business days out], or let me know if there is an outstanding issue I need to address.
If I do not hear back, I will need to pause any current work and refer the matter to collections.
Best,
[Your name]
When to actually charge the late fee
Late fees are usually more useful as a signal than as revenue. The mention in the day-30 email is what tends to get attention. Most clients pay before the fee is ever actually assessed.
Charge it when your contract or terms explicitly authorised it, when the client has been ignoring you for a long while, and when you do not expect to work with them again and want to make the cost of waiting tangible.
Do not charge it on the first overdue invoice with a long-standing client. The relationship is worth more than the percentage. The fuller treatment of this question is in the late-fees essay.
When to escalate beyond email
Phone call at day 14 to 21. If two emails have not worked, pick up the phone. It is harder to ignore a voice. Keep it brief and friendly. Ask if there is an issue, and ask when payment will arrive.
Pause ongoing work at day 30. If they have current projects with you, this is the actual leverage. Do not threaten; just calmly stop. "I will pause work on [project] until INV-0042 is settled." Often this is the unlock that nothing else has been.
Collections agency at day 60 to 90. Most agencies take 25 to 40 percent of the recovered amount. For small invoices it is not worth it. For anything over about $2,000, it usually is, and agencies often recover within a few weeks because their letterhead carries more weight than yours.
Small-claims court at day 90 plus. Cheap, does not require a lawyer, but takes time and a court appearance. Worth it for amounts under about $5,000 to $10,000 where you have clear documentation and the defendant is locatable.
Prevention is cheaper than collection
All of this is recoverable, but it is also avoidable. Three practices that nearly eliminate the problem in the first place:
1. Net 14 instead of Net 30 with new clients. Less time for the invoice to be forgotten. After six months of on-time payment you can switch them to Net 30 as a courtesy.
2. 50% upfront for projects over $2,000. If a client balks at paying half on signing, they will balk at paying the second half too. Better to find out before you do the work.
3. Auto-pay for retainer clients. Stripe Subscriptions, GoCardless or your bank's direct-debit equivalent. Removes the need to be paid each month; you just are paid each month.