Unpaid invoices: how your business can minimise the risk before problems arise

William Slivinsky
5 days ago
5 min read

Unpaid invoices are not just an admin problem. They affect cash flow, staff wages, supplier relationships and the time you spend running the business.

Many businesses only think about legal protection after the invoice has already been ignored. By that stage, the options may be limited to chasing, negotiating, sending a letter before action, or issuing a claim. In small claim track "money does not follow event" which means you cannot recover 100% owned money.

A better approach is to reduce the risk before the dispute starts. This means having clear, fair and properly drafted payment terms from the beginning.

Unpaid invoices: The Late Payment Act helps, but it may not be enough

The Late Payment of Commercial Debts (Interest) Act 1998 gives businesses a statutory right to claim interest on qualifying commercial debts. In business-to-business transactions, statutory interest is usually calculated at 8% above the Bank of England base rate. The same regime may also allow fixed compensation of £40, £70 or £100, depending on the value of the debt, together with reasonable recovery costs in appropriate cases.

This can be useful, especially where there are no clear contractual payment terms.

But in practice, the statutory sums may not always be enough to deter late payment.

For some debtors, the additional cost of delaying payment may still appear low when compared with the benefit of holding onto cash. A customer may decide to ignore an invoice, delay payment, or raise weak objections simply because the consequences are unclear or commercially manageable.

That is why businesses should not rely only on statutory protection.

Prevention starts with better contract drafting

Good drafting can make a real commercial difference.

A properly drafted contract can set out:

when payment is due;
what happens if payment is late;
whether interest applies;
whether recovery costs are payable;
whether services can be suspended;
whether further work can be refused until arrears are cleared;
whether ownership of goods remains with the supplier until payment;
what evidence will be used to prove delivery, completion or approval; and
how disputes about invoices must be raised.

These clauses do not guarantee payment. However, they can make it harder for a customer to delay, dispute or ignore an invoice without consequences.

They also place your business in a stronger position if recovery action becomes necessary.

Why clarity matters

Many invoice disputes arise because the contract is unclear.

For example, the customer may say:

“We never agreed those payment terms.”
“The work was not approved.”
“There was no deadline for payment.”
“We did not know interest would be charged.”
“The extra charges are unfair.”
“The invoice is disputed.”

A well-drafted contract reduces these arguments by making the position clear before work starts.

The aim is not to create aggressive or unfair terms. The aim is to make the bargain clear, transparent and commercially justified.

The good faith principle: fair and open dealing

Where payment, default and interest clauses create serious financial consequences, they should be drafted carefully.

The principle from Director General of Fair Trading v First National Bank plc [2001] UKHL 52 is important. In that case, the House of Lords explained that good faith involves fair and open dealing. Terms should be expressed fully, clearly and legibly, and should not contain concealed pitfalls or traps.

For business owners, the practical lesson is simple.

If you want to rely on default charges, post-default interest, recovery costs or suspension rights, those terms should be clear, prominent and fair.

They should not be hidden in small print. They should not be drafted in a way that surprises the customer only after default. They should be brought into the contract properly and supported by a legitimate business reason.

This is especially important where you deal with consumers, small businesses or customers using standard terms.

Strong terms should still be fair terms

Some businesses make the mistake of thinking that stronger terms mean harsher terms.

That is not the right approach.

A clause is more likely to be useful if it is:

clear;
proportionate;
transparent;
commercially justified;
properly incorporated into the contract; and
easy to explain if challenged.

For example, a clause dealing with late payment should clearly explain when interest starts, how it is calculated, whether recovery costs are payable, and what steps the business may take if the debt remains unpaid.

A suspension clause should explain when services may be paused and what notice, if any, will be given.

A default charge should not look like a hidden penalty. It should be connected to real administrative or commercial consequences caused by late payment.

The more serious the consequence, the more important clear drafting becomes.

Practical clauses that can reduce unpaid invoices

Depending on the type of business, your contract may need clauses covering:

1. Payment deadlines

The contract should state exactly when payment is due. For example, payment may be due before work starts, on completion, within 7 days, within 14 days, or by staged instalments.

Vague wording creates avoidable disputes.

2. Late payment interest

The contract can explain whether statutory interest applies, whether a contractual interest rate applies, and how interest will be calculated.

This avoids uncertainty when the invoice becomes overdue.

3. Recovery costs

The contract should deal with the cost of chasing late payment, including administrative costs, legal costs or debt recovery costs where appropriate.

This should be drafted carefully and fairly.

4. Suspension of services

If your business provides ongoing services, you may need the right to pause work where invoices remain unpaid.

Without a clear suspension clause, stopping work can itself create a dispute.

5. Retention of title

Where goods are supplied, a retention of title clause may help protect ownership until payment is made.

This can be important if the customer receives goods but then delays or refuses payment.

6. Evidence of completion or delivery

Your contract should explain how completion, delivery or acceptance will be recorded.

This may include signed delivery notes, email approval, photographs, portal confirmations, job sheets or other business records.

Good evidence makes invoice recovery easier.

7. Dispute notification

A useful clause can require customers to raise invoice disputes within a specific period and explain the reason for the dispute.

This can reduce late, vague or tactical objections.

Unpaid invoice recovery is easier when the contract is prepared properly

When a debt is disputed, the first question is often not whether the invoice exists.

The real questions are usually:

What did the contract say?
Were the payment terms agreed?
Was the customer told about the consequences of late payment?
Was the work completed or delivered?
Is there evidence?
Are the charges fair and transparent?

If these points are unclear, recovery becomes harder.

If they are properly drafted from the start, your business is in a much stronger position.

How I can help

I help businesses reduce legal and commercial risk through practical contract drafting.

This includes reviewing and drafting payment terms, invoice clauses, late payment clauses, default provisions, suspension rights, recovery cost clauses and related terms designed to protect cash flow.

The aim is not to make your contracts unnecessarily complicated. The aim is to make them clear, enforceable, commercially useful and suitable for the way your business actually operates.

If your business has regular unpaid invoice problems, weak payment terms, unclear terms and conditions, or no written contract at all, it may be time to fix the structure before the next dispute arises.

Final point

The Late Payment Act can help after payment is already late. But better drafting can help prevent the problem from arising in the first place.

Clear payment terms, fair default clauses and transparent post-default consequences can reduce disputes, improve recovery prospects and protect your business cash flow.

Unpaid invoices are often a sign that the legal structure behind the business needs attention.

Good drafting is not just paperwork. It is risk control.