What to Do When an Invoice Goes Overdue

An overdue invoice is not a crisis on day one, but how you handle the first few days shapes how long it stays unpaid. Here is a practical sequence, roughly in order.

Day of the due date: verify before you assume

Before doing anything else, check that the invoice was actually received. Was it sent to the right email? Did a spam filter catch it? If the client uses a portal or PO system, was it submitted the way they require? A surprising share of "late" payments are invoices that never reached the right person or process.

First week: a neutral check-in

Send a brief, factual note (see invoice reminder templates) asking about status rather than demanding payment. At this stage, most overdue invoices resolve simply because someone forgot or an approval was still pending. No further action is needed beyond the nudge.

Confirm you're talking to the right person

If there has been no response, check whether you are corresponding with the person who can authorize payment. For business clients, that is often not the person who requested the work. Accounts payable, a manager, or a separate finance contact may need to be looped in directly.

Two to three weeks: get a specific commitment

If the invoice is still unpaid, ask for a specific date rather than accepting a vague "soon." A concrete date you can follow up against is far more useful than an open-ended assurance. If the client will not commit to one, that is useful information in itself.

Consider whether a payment plan makes sense

If the client cannot pay the full amount but genuinely intends to pay, a structured payment plan can get you paid in installments rather than not at all. It is worth considering before escalating further, particularly for a client you want to keep.

Past a month: decide on your ceiling

At some point, continued informal follow-up has a diminishing return. Decide in advance how long you will pursue an invoice informally before moving to a collection letter, a collections agency, small claims court, or, if the amount does not justify further effort, writing it off as bad debt. The broader options are covered in collecting unpaid invoices.

Worked example: how the cost of waiting adds up

You are owed $4,800 on an invoice due June 1 with a stated late fee of 1.5% per month on the unpaid balance.

• Monthly fee: $4,800 × 0.015 = $72.00.
• After two months unpaid: fees of $144.00, so the claim is $4,944.00.

Now compare options at day 45:

• A collections agency keeping 25% of anything recovered would net you $4,944 × 0.75 = $3,708 if it collects in full.
• A payment plan of three payments of $1,648 (total $4,944) nets the full amount, if the client keeps to it.
• Small claims court may cost a filing fee plus your time. Check local costs first.

The numbers show why a plan with a client who wants to pay often beats a harsher route. The late payment fee calculator and the days past due calculator help you work out the figures for your own invoice. Whether and how fees or statutory interest may be charged differs by country, so confirm with an accountant before adding them.

Step-by-step checklist

1. Day 0: confirm delivery and the right recipient.
2. Day 1 to 7: send a neutral reminder.
3. Day 7 to 14: follow up again and try a phone call.
4. Day 14 to 21: request a specific payment date in writing.
5. Day 21 to 30: offer a payment plan if the client is cooperative but short of cash.
6. Day 30+: send a formal letter with a deadline.
7. After the deadline: act on the step you named, or write it off.
8. Throughout: log every contact.

Common mistakes

• Waiting too long to start. Every week of silence makes the next message harder to send.
• Pausing work without warning. If you keep delivering to a client who is not paying, your exposure grows. Consider stopping new work until the old invoice is settled, and tell the client before you do.
• Mixing up a dispute with a delay. If the client is questioning a charge, see invoice disputes. Pressure alone will not resolve it.
• Making threats you will not follow through on. It costs credibility.
• Forgetting to update your records. Track the status as described in invoice statuses, and review aging monthly. The AR aging calculator shows how old your open balances are.

Keep records throughout

Every communication about an overdue invoice matters more the further the situation escalates. Note the dates, what was said, and any commitments made. If it does end up in a collections process or a legal dispute, a clear paper trail is the difference between a straightforward case and a messy one.

FAQ

How long should I wait before calling an invoice overdue?

It is overdue the day after the due date. Whether you act the same day is a judgment call. A courtesy note on day one or two is normal.

Can I stop work for a client who has not paid?

Often yes, if your contract or terms allow it. Give written notice first. Check your agreement and, for high-value cases, seek legal advice.

Should I charge a late fee?

Only if you stated it before the invoice was due. Some countries also have statutory late-payment rules for business-to-business invoices. Check what applies in your location.

When is it time to write it off?

When the amount owed no longer justifies the time and cost of chasing it, or the client is clearly unable to pay. See bad debt for how to record it.

Most overdue invoices resolve in the first two stages. The sequence exists for the minority that do not, so you are never deciding what to do next in the moment, under frustration, without a plan.