Late Payments & Collections
How to Collect Unpaid Invoices (Step-by-Step)
Short answer
Collect unpaid invoices by escalating in fixed steps: a polite reminder at day 1 late, a firm follow-up at day 7, a phone call at day 14, a formal demand letter at day 30, then collections or small-claims court after day 60. Document every touchpoint.
Unpaid invoices are the single largest source of cash-flow pain for small service businesses. The Federal Reserve's Small Business Credit Survey consistently shows that more than half of small employers experience late or missed customer payments each year. The good news: most overdue invoices are not write-offs — they are communication failures. A documented, escalating collection process recovers the majority of late invoices without ever hiring a collection agency or a lawyer.
The 7-step collection sequence
The single biggest mistake small business owners make is treating collections as a personality contest. It is a process. Pick the sequence below, write it into your operating procedure, and run it on every late invoice the same way — your most loyal customer and your worst customer get the same emails on the same days. This protects the relationship (the customer never feels singled out) and protects you (your records are consistent if you ever escalate legally).
- Day 0 (due date): Send a friendly 'invoice due today' reminder by SMS or email.
- Day 1–3 late: Send the first 'past due' notice. Keep it polite and assume good faith — most late payments are oversights.
- Day 7 late: Second notice. State the new balance including any late fee, and reference the original due date.
- Day 14 late: Call the customer directly. A phone call recovers more invoices at this stage than any other action.
- Day 30 late: Send a formal written demand letter (email + certified mail). State the consequences of non-payment in plain language.
- Day 45 late: Pause all new work, suspend any active service or warranty, and offer a final payment plan.
- Day 60+ late: Hand off to a collection agency or file in small-claims court. After 90 days the recovery rate drops sharply, so do not wait.
What to say in each follow-up
Tone matters more than length. Early reminders should be short, warm, and remove friction (include a payment link). Mid-stage messages should be neutral and factual. Late-stage messages should be unmistakably formal — but never threatening or insulting, which can hurt you legally and almost never speeds payment.
Always include four things: the invoice number, the original amount, the days past due, and a one-click way to pay. If your customer has to ask you to resend the invoice, you have lost a week.
| Stage | What to send |
|---|---|
| Day 1 late | Friendly SMS or email + payment link. 'Hi {name}, just a heads up that invoice #1042 was due yesterday — here is the link in case it got lost: {link}.' |
| Day 7 late | Email with attached PDF, late fee notice if your terms allow it, and a deadline ('please remit by Friday'). |
| Day 14 late | Phone call. Document the conversation in your invoice notes. |
| Day 30 late | Formal demand letter referencing your written agreement, terms, and intent to escalate. |
| Day 60 late | Final notice, then collections or small claims. |
When to use a collection agency vs. small claims
Use a collection agency when the invoice is between roughly $500 and $5,000, you do not have time to litigate, and you do not need to preserve the customer relationship. Agencies typically take 25–50% of recovered amounts but cost nothing upfront.
Use small-claims court when the invoice is above the agency-fee break-even (often $1,000+), you have clean documentation (signed estimate, signed work order, signed invoice, communication history), and the customer is local and likely solvent. Filing fees are usually $30–$200 and most states allow claims up to $5,000–$10,000 without a lawyer.
Do not bother with either path if you have no signed approval of the work scope and no proof of delivery — invest that time in getting estimates and deliveries signed going forward instead.
Frequently asked questions
How long should I wait before sending an unpaid invoice to collections?
Most small businesses send invoices to collections between 60 and 90 days past due. Waiting longer than 90 days sharply reduces the recovery rate. If your collection sequence has reached day 45–60 without payment, start the handoff.
Can I add a late fee to an unpaid invoice?
Yes, if your original written agreement, estimate, or invoice terms disclosed the late fee in advance. State law caps the maximum rate (typically 1.5% per month or 18% annually). You cannot retroactively add a fee that was never disclosed.
Should I stop working for a customer who has unpaid invoices?
Yes — once an invoice passes 30 days late, pause new work. Continuing to deliver while invoices age makes the total harder to collect and signals to the customer that prompt payment is optional.
Is it worth suing a customer over an unpaid invoice?
Small-claims court is worth it for invoices roughly $1,000 and up when you have signed documentation, the customer is local, and your time investment is reasonable. For smaller amounts, a collection agency or write-off is usually more cost-effective.
Put this guide to work.
Glo Invoice automates reminders, takes online payments, and tracks your AR — free for 14 days.
Sources & further reading
Primary sources we consulted when writing and reviewing this guide.