A past-due invoice isn’t an emergency, but it does start a clock. The longer it goes unpaid, the harder collection becomes — and the more options you lose. Knowing what to do at each stage keeps you in control of the process.
Day 1–3 past due: the polite reminder
Most invoices that go slightly past due aren’t cases of bad faith — they’re lost in an inbox, stuck in an approval queue, or just forgotten. A brief, friendly email is the right first move.
State the invoice number, the amount, and that it’s now past due. Include your payment details or link. No accusation, no frustration. Keep it three sentences.
This handles the majority of late invoices. Most clients pay within 24 hours of a reminder.
Day 7–10 past due: the follow-up
If the first reminder goes unanswered, send a second email that’s more direct. Acknowledge that you’ve followed up before. Set a specific new deadline — a real date, not “within the next few days.”
If your contract includes a late fee, you can mention that fees are accruing. Don’t threaten vaguely. If your contract says 1.5% per month starts accruing on day 31, say that.
Day 14–21 past due: formal notice
At two to three weeks past due, switch from informal email to a formal overdue invoice notice. This is a structured document (not just an email thread) that states:
- Invoice number and amount
- Original due date
- Current balance including any late fees
- A firm new payment deadline
- Consequences if the deadline passes
Send this by email with a PDF attachment. For large amounts, send a physical copy as well.
Adding late fees
You can add a late fee the moment an invoice is overdue — but only if you established the fee in writing before the work started. That means it needs to be in your contract, your proposal, or the invoice itself.
Common structures:
- Flat fee: $25–$50 per week after the due date
- Percentage: 1–2% of the invoice balance per month
- One-time penalty: A fixed amount added at a specific overdue threshold (e.g., 30 days)
A late fee clause has two functions: it compensates you for the delay, and it creates financial incentive for the client to pay promptly.
What past-due means for your relationship with the client
A single late payment, handled professionally, usually doesn’t end a client relationship. Multiple late payments, or a complete non-payment, is a different story.
A few things to consider:
- Pause future work if a significant invoice is more than 30 days past due. You’re extending credit at that point.
- Don’t agree to new projects while an old invoice is unresolved. It gives the client leverage.
- Keep communications professional regardless of your frustration. The paper trail you’re creating may matter later.
Day 30–60 past due: escalation options
Demand letter: A formal letter — ideally drafted with legal counsel — stating the amount owed, the deadline, and the intent to pursue legal action. This is distinct from your overdue notice. A lawyer’s letterhead changes the tone significantly.
Small claims court: For amounts within your jurisdiction’s limit (typically $5,000–$15,000 in the US depending on the state), small claims is a practical option. You file, serve the client, and appear in court. Attorney not required. Filing fees are typically $30–$100.
Collections agency: Agencies take a percentage (often 25–50%) of any amount recovered. This makes sense for larger invoices or situations where you’ve given up on recovering the relationship.
When to write it off
If the invoice is small, the client is difficult, and the recovery process will cost more in time and stress than the invoice is worth, you may decide to write it off as a bad debt. Document the original invoice, the attempts to collect, and the write-off for tax purposes. In many jurisdictions, uncollectable business debts are tax-deductible.
A $300 invoice that takes 10 hours of chasing, stress, and legal research to collect is not actually a $300 invoice.
Preventing past-due invoices
The best response to a past-due invoice is not having one. Contracts with clear payment terms, upfront deposits for large projects, and tools like Waco that send automatic payment reminders significantly reduce the number of invoices that go past due in the first place.
Sending invoices promptly after project completion, requiring deposits before starting work, and setting net-15 instead of net-30 terms are the three most effective prevention measures.
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