The short answer
When a client stops replying, sending more email is the least effective thing you can do. Change the channel, then change the ask:
Rule out the dull explanations first: a wrong address, a spam filter, or a contact who has left.
Phone them. This is the step most often skipped and most often recommended.
Go around your contact to accounts payable, and to a second person who cares about the work.
Send one written message with a deadline and a named next step.
Choose the route: a formal letter, a claim, collections, or writing it off.
Silence is not usually a decision to keep your money. More often it is embarrassment, a cash problem nobody wants to describe, an objection to the work that was never said out loud, or an invoice sitting behind a person who left.
First, is it actually silence?
Check whether the client is replying to anything else. If the project channel is alive and only the payment thread has gone quiet, you are dealing with avoidance, and the steps below apply. If nobody at the company is replying to anyone about anything, treat it as a possible sign of trouble and move faster.
Then rule out the boring explanations, which account for more silences than people expect:
The invoice went to one person, who has left, and the address still accepts mail.
Your emails are being filtered, which happens more often when invoices are sent from a domain without proper email authentication. The accounts@ setup covers how to fix that.
The invoice was never received, because it went to a project contact rather than an accounts payable address.
Everyone relevant is away, and nobody has covered the approval.
Confirm delivery before escalating. Accusing someone of ignoring you when your emails were landing in a spam folder costs you the moral ground for everything that follows.
Phone them
The strongest and most consistent advice from business owners who have been through this is to stop typing and call. Email is easy to defer; a direct question asked out loud is not. Call your contact, and if they do not answer, call the main company number and ask for accounts payable.
Keep the call short and factual. You are not asking for money so much as for information:
Hi, it’s Tatiana from [company]. I’m calling about invoice #214, which was due on 1 October. I haven’t been able to reach anyone by email, so I wanted to check it arrived and find out where it is in your process.
Then ask 2 questions: has it been approved, and which payment run is it in. Write down the answers, the date and the person’s name, and follow up the same day by email confirming what was said. That email is what turns a phone call into a record.
Go around your contact
If your contact has gone quiet, the invoice is probably not moving through them. 2 routes are usually open, and neither is aggressive:
Accounts payable directly. Send the invoice again to their AP address, with the purchase order number and the date it was originally sent. AP teams process invoices for a living and are often unaware there is a problem.
A second person who wants the work to continue. The person who commissioned the project, or whoever depends on what you delivered, has a reason to unblock it that your contact may not.
Keep the tone identical to your normal messages. You are widening the circle, not making a complaint, and word travels inside a client company faster than an invoice does.
The message that changes the ask
If the phone and the wider circle produce nothing, send one written message that is different from the ones before it. Until now you have asked for payment. This one states a date and a consequence, and then you keep to it:
Subject: Invoice #214 — next steps
Hi [Name],
Invoice #214 for [amount] was due on [date] and remains unpaid. I’ve tried to reach you by email on [dates] and by phone on [date].
If I don’t hear from you by [date, about 7 days out], I’ll [pause work on the current phase / refer the invoice for formal recovery]. I’d much rather agree a payment date with you instead.
If something is wrong with the invoice or the work, tell me and I’ll deal with that first.
Thanks,
[Name]
3 things make this work. The dates are specific, so the record is clear. The next step is one you are willing to take. And the last line leaves an exit for a client whose real problem is an objection to the work they have not been willing to raise.
Send it from your billing address and copy accounts payable. The follow-up templates cover the messages that come before this one.
Choosing the route
If the deadline passes with no answer, pick one deliberately rather than drifting:
Route | When it fits | What it costs |
|---|---|---|
Pause or stop work | Work is ongoing and the contract allows it | Nothing, if the clause is there |
Formal demand letter | You want a lawyer’s letterhead behind the deadline | A few hundred dollars, often enough on its own |
Small claims | A clear, undisputed debt within your court’s limit | Filing fees and your time |
Collections agency | The relationship is over and the debt is not disputed | Typically 25% to 50% of what is recovered |
Write it off | The amount is small and the evidence is thin | The invoice, and the lesson |
Small claims is a state court process in the US, and the limits, forms and rules differ in every state, so check your own state court’s self-help pages before assuming your invoice qualifies. In the EU and the UK the equivalent routes are national too, and the UK government notes that mediation can be quicker and cheaper than court. Take advice before sending anything that reads as a final demand.
One route to avoid: a collections agency while the work itself is in dispute. Collections is built for amounts nobody is contesting.
Keep the record as you go
Every step above is worth more with a record behind it. Keep the invoice, the delivery confirmations, the dates you wrote and called, the names of everyone you spoke to, and the approval or sign-off for the work. A lawyer, a court or a collections agency will ask for exactly this, and reconstructing it from a sent folder months later is the part everyone regrets.
It is the same record that makes ordinary payment operations work, which is why it is worth keeping before anything goes wrong.
FAQ
What do I do when a client ignores my invoice emails?
Confirm the emails are arriving, then phone. Call your contact, and if that fails, call the company and ask for accounts payable. Follow the call with an email confirming what was said, then send one message with a deadline and a specific next step.
How long should I wait before escalating?
If a client has gone completely silent after delivery, start the phone and accounts payable steps within a week or 2 of the due date. Waiting a month turns an administrative problem into a confrontation and makes the trail harder to reconstruct.
Is it acceptable to contact someone else at the company?
Yes, and it is normal practice. Accounts payable process supplier invoices as their job, and the person who commissioned the work has a reason to help. Keep the tone the same as your usual messages.
Should I send a disputed invoice to a collections agency?
No. Collections works on amounts that are not contested. If the client is silent because they have an objection to the work, resolve that first.
When is it time to write the invoice off?
When the amount is small enough that pursuing it costs more than it recovers, and the evidence is too thin to support a claim. Write it off properly, then change the terms and take a deposit next time rather than carrying the resentment.
Not legal or tax advice. Payment law and enforceable interest rates vary by state and country — have any formal letter or claim reviewed by your own lawyer before use.