Client Won't Pay an Invoice? What to Do, Step by Step

First: diagnose why they aren't paying

Non-payment has four common causes, and each needs a different response:

1. They forgot - solved by reminders (the majority of cases)
2. Cash flow problems - solved by a payment plan
3. They dispute the work - solved by a conversation, not more emails
4. They never intended to pay - solved by escalation

Assume good faith in your first messages. Escalate methodically if the silence continues.

Step 1: Run the reminder sequence (days 1-14)

Send structured reminders at due date, +7 days and +14 days. Keep them short, factual and friendly - our payment reminder templates cover the exact wording. Most invoices die of forgetfulness, not refusal.

Step 2: Pick up the phone (day 15)

Email is easy to ignore; a call is not. Stay warm: "Hi, I'm following up on invoice 1042 - is there an issue on your end I can help resolve?" Take notes of the date, who you spoke to and what they promised. A promised date turns vague delay into a commitment you can reference.

Step 3: Apply the late fee you agreed (day 15-30)

If your contract or invoice states a late fee, apply it now and send a revised invoice. Typical terms are 1.5% per month or a flat fee - use our late fee calculator to get the number right. The fee itself matters less than the signal: this debt grows, and ignoring it costs money.

Step 4: Pause the work

If work is ongoing, pause it - professionally: "I've paused work until the account is brought current." Never threaten to delete or hold hostage work they've already paid for; simply stop extending new credit. Continuing to deliver while unpaid trains clients that your invoices are optional.

Step 5: Send a formal demand letter (day 30-45)

A demand letter changes the register from reminder to legal preamble. One page: the amount, the history of the invoice and reminders, a firm deadline (7-14 days), and what happens next (collections or court). Send it by email and post. Many stubborn invoices get paid at this stage because it signals you won't just go away.

Step 6: Small claims court or collections (day 45+)

• Small claims court works well for amounts within its limit (varies by region, often $5,000-$10,000). Filing is cheap, lawyers usually aren't needed, and your documented reminder trail is your evidence.
• Collection agencies take a cut (often 25-50%) but require no time from you.
• For large amounts, a lawyer's letter costs little and moves mountains.

How to never end up here again

• Deposits. Take 30-50% upfront on new clients. Someone unwilling to pay a deposit is showing you who they are early.
• Late fee terms on every invoice - agreed before the work, so step 3 is contractual, not a negotiation.
• Short payment terms - Net 14 beats Net 30 for small businesses; see our payment terms guide.
• Automatic reminders - BillingOtter chases invoices for you, which keeps the relationship clean: the software nags, you stay friendly.