How do you handle a customer who doesn’t pay?

For credit managers, finance directors, and business owners, a customer who doesn't pay puts both cash flow and relationships under pressure.

This article sets out a step-by-step process, the conversations worth having before legal action, and the signals that tell you when escalation is the right call. The answer, consistent across Intrum's 20+ European markets, points in one direction: early dialogue, not early escalation, drives better recoveries — and better customer outcomes.

Why a customer doesn’t pay an invoice

Before deciding what to do about an unpaid invoice, it helps to understand why it is unpaid. The reasons fall into a small number of categories, and the right response differs in each.

Cash flow pressure on the customer’s side

This is the most common cause. The European Payment Report 2026 finds that 62% of businesses say late payments have caused them to fall behind on paying their own suppliers — which means many of the companies that owe you money are themselves waiting to be paid. The customer is not refusing to pay. They are queuing your invoice behind others.

For consumers, 4 in 10 participants who had missed payments in Intrum's European Consumer Payment Report 2025 cited lack of money as the primary reason.

Administrative friction

The invoice may have gone to the wrong email address, missed a purchase-order reference, been received during a key person’s holiday, or stalled in an approval workflow nobody is monitoring. A surprising proportion of unpaid invoices are not disputes at all — they are process failures, and they resolve quickly once the right person is reached.

Among European consumers, 17% say that technical challenges have prevented them from paying bills on time (European Consumer Report 2025), making it clear non-payment is not always about lack of willingness or ability to pay, but often also about practical barriers in the payment journey.

Two important areas within administration is payment options and communication channels. The payment journey should mirror how customers actually prefer to pay today, for example with debit/credit card, Klarna, Apple Pay, Vipps, Swish, or other locally relevant solutions. Just as important is the channel — does the customer receive the invoice by email, in an app, by letter, or by SMS? 

An optimized customer journey based on the segment's preferred channel and payment method increases the likelihood of payment.

A dispute the customer has not yet raised

Sometimes the customer is unhappy with the work, the goods, or a line item on the invoice, and has chosen silence over confrontation. The invoice sits unpaid because the customer has decided, consciously or not, that not paying is easier than having the conversation.

Deliberate non-payment

A smaller share of unpaid invoices reflect a customer who has decided not to pay, or who is in serious financial difficulty and prioritising other creditors. These cases are real, and they are where formal collections processes and legal action eventually have to do the work — but they are the minority, and treating every late invoice as if it belongs in this category damages relationships you would rather keep.

Before chasing payment: what to check

If a customer has not paid an invoice, the temptation is to send a sharper email immediately. That instinct is usually wrong. A short pause to check the basics tends to save weeks of avoidable conflict later.

1. Confirm the invoice was received by the right person, at the right address, with the right reference. A surprising number of disputes are resolved by re-issuing the invoice to a different inbox.
2. Check that the invoice itself is correct. Wrong VAT treatment, missing PO numbers, the wrong contract reference, or an arithmetic error are all common reasons an invoice is parked rather than paid.
3. Review the agreed payment terms. If the contract specifies 60 days and you are following up at day 35, you do not yet have an overdue invoice — you have a cash-flow concern.
4. Look at the customer’s payment history. A customer who has always paid in 45 days and is now at 50 is a different problem from one who has stretched from 30 to 90 over the past two quarters.
5. Check whether anyone on your side has spoken to the customer recently. A delivery query raised three weeks ago and never resolved is often the reason the invoice is sitting unpaid.

These checks take an hour at most, and they reframe the conversation that follows. You are no longer chasing a delinquent customer. You are following up on a specific invoice, with a clear understanding of where it sits in their process.

What to do if a customer doesn't pay: a step-by-step process

The process below sets out what to do when a customer doesn't pay on the agreed terms. It assumes you have already done the basic checks above, and that the invoice is genuinely overdue.

Step 1 — A polite reminder, sent early

As soon as an invoice goes past its due date, send a short, professional reminder. It should re-attach the invoice, reference the agreed terms, and ask the customer to confirm when payment will be made. Avoid emotional language. The reminder is a piece of operational follow-up, not a complaint.

Step 2 — Follow up through the most effective channel

If the reminder goes unanswered, finding the right contact channel makes all the difference. Some customers respond to a follow-up email, others to an SMS, and some only engage when you call.

When you do reach them, keep it simple: confirm they received the invoice, ask if anything is blocking payment, and get a commitment to a date. Whatever the channel, follow up in writing the same day to confirm what was agreed.

Step 3 — Escalate inside the customer’s organisation

If the person you have been dealing with is unable to confirm a payment date, the issue often sits a level above them — with their finance manager, accounts-payable lead, or commercial director. Ask, politely, to be put in touch. The willingness to escalate signals that the invoice is being taken seriously without yet turning the conversation adversarial.

Step 4 — A formal demand letter

If reminders, calls, and escalation have not produced payment, the next step is a formal letter. It should set out the amount owed, the original due date, the days overdue, any interest or statutory compensation that applies under local late-payment legislation, and a clear deadline for payment. The letter is not yet legal action — it is the written record that legal action, if it follows, will rest on.

Step 5 — Mediation or third-party collections

When in-house follow-up has reached its limit, bringing in a third party often changes the dynamic. A professional debt collection partner sits between you and the customer, which preserves the commercial relationship in a way that direct conflict rarely does. Crucially, a well-run collections process is not the same as an aggressive one: the most effective recoveries come from understanding the customer’s circumstances, agreeing realistic payment plans, and treating the person on the other end of the call as someone in a situation rather than as a target.

Step 6 — Legal actions for unpaid invoices, when it is warranted

Legal action — court proceedings, statutory demands, or insolvency petitions where appropriate — should be the final step, not the first. It is justified when the amount is material, the customer has refused to engage, and the prospects of recovery through dialogue are exhausted. Before issuing proceedings, take legal advice on the jurisdiction, the cost of the action relative to the debt, and the customer’s likely ability to pay. Litigation that ends in an unenforceable judgment is rarely worth the cost.

When to escalate, and when to wait

One of the harder judgements in credit management is timing. Escalate too early and you damage a relationship that would have settled itself. Escalate too late and you join the back of a queue of creditors competing for assets that may no longer be there. 

A few signals suggest the situation is moving from late payment to something more serious:

• The customer stops responding to emails and calls — silence is more concerning than excuses.
• Payment dates are repeatedly promised and missed.
• Other suppliers, publicly or through informal networks, report the same experience.
• Credit-monitoring services flag a deterioration in the customer’s rating, or filings appear on public registers.
• The customer asks to renegotiate terms on multiple invoices, not just the one in dispute.

When several of these signals appear together, the question shifts from how to collect this invoice to how to limit further exposure. That is the point at which a conversation with a professional credit management partner becomes useful, even if you do not formally hand the file over yet.

Get professional help

To know when to escalate or not is exactly where a specialist partner can create great value — helping businesses assess when to wait, when to escalate, and how the customer journey can be handled in a balanced way.

What not to do when a company has not paid you

There are a small number of moves that look decisive in the moment and almost always make recovery harder.

• Do not threaten legal action you are not prepared to take. An empty threat told once is forgivable; repeated, it tells the customer your follow-up has no consequences.
• Do not stop supply without checking the contract. In some jurisdictions and some sectors, withholding goods or services from a customer who has not formally been declared in breach exposes you, not them.
• Do not let the matter go quiet. Unpaid invoices age, and aged debt is harder to recover. If you have decided to wait, set a specific date on which you will pick the file back up.
• Do not personalise the conflict. The person you are speaking to inside the customer’s business is often not the decision-maker, and treating them as the source of the problem closes the door you need to keep open.

Preventing the next unpaid invoice

Most of the work of avoiding non-payment — and of not getting paid for work already delivered — happens before an invoice is ever issued. Three habits, in particular, distinguish credit teams that rarely have to chase from those that always do.

Run credit checks before extending terms

For new customers, and periodically for existing ones, check the customer’s credit profile. Pay attention to changes in rating, not just the headline number. A customer who has dropped two grades in a year deserves different terms from one who has held steady.

Make terms explicit and consistent

Payment terms should be set out in writing, agreed before work begins, and applied consistently. Quiet exceptions become precedents, and precedents become the norm. If you charge interest on late payment under local statutory rights, say so on the invoice itself.

Invoice promptly and accurately

An invoice that arrives a week after the work was completed is already at the back of the customer’s queue. An invoice with a wrong line item triggers a dispute that buys the customer time. Speed and accuracy at the point of invoicing are unglamorous, but they remove a material share of the reasons invoices go unpaid.

The long view: dialogue first, action when necessary

Across 20+ European markets, the pattern Intrum sees is consistent. The businesses that recover the most from late and unpaid invoices are not the ones that escalate fastest. They are the ones that get to the conversation earliest, understand the customer’s situation accurately, and reserve formal action for the cases that genuinely require it.

That approach takes patience, and it takes a credit function that is properly resourced — but it produces better recoveries, fewer broken relationships, and a more accurate read of which customers are worth keeping. Aggressive collection, by contrast, tends to recover the easy debts that would have settled anyway, while pushing the harder cases further out of reach.

When to bring in a partner

There is a point in every unpaid-invoice situation at which internal follow-up has done what it can. Past that point, a specialist debt collection partner can recover more of what is owed, more often, and with the commercial relationship preserved — because the work is being done by people whose job is to understand both the financial and the human side of non-payment.

If you would like to read more about how Intrum’s debt collection services and how we help businesses recover unpaid invoices while treating customers fairly, you can find an overview on our Debt collection service page.