Your legal rights when a client pays late — UK freelancer's guide

The mindset shift: late payment is a breach, not a favour

Most freelancers treat a late payment as an awkward social situation — something to tolerate gracefully, mention apologetically, and absorb quietly. The law treats it as what it is: a breach of contract with statutory remedies attached. When a business client misses your due date, you don't acquire a grievance. You acquire rights.

And UK law is unusually strong here. The Late Payment of Commercial Debts (Interest) Act 1998 — amended in 2002 and 2013 — gives every supplier, down to a one-person sole trader, an automatic package of interest, fixed compensation, and recoverable costs on every overdue B2B invoice. No contract clause needed. No notice to "activate" anything. The tragedy is that the businesses these rights were designed for — freelancers and small suppliers — are the ones who use them least. Here are the five rights, in the order you'll use them.

Right 1: Statutory interest — automatically

From the day after your invoice's due date, the unpaid amount accrues interest at 8% above the Bank of England base rate — currently 11.75% per annum — calculated daily until it's paid. You don't need an interest clause in your contract. You don't need to have warned the client. The right is created by statute, not by agreement, and it applies to any B2B invoice where both parties were acting in the course of a business.

The formula: invoice amount × 11.75% ÷ 365 × days overdue. The amounts are modest day by day, but the point isn't the money — it's the meter. A client who knows interest is accruing daily behaves differently from one who knows lateness is free. The full mechanics are in our guide to the Act.

Right 2: A fixed debt recovery cost on every overdue invoice

The moment an invoice goes overdue, you're also entitled to a fixed sum as compensation for the cost of recovering the debt — per invoice, regardless of how long it stays unpaid:

• Invoices under £1,000 — £40
• Invoices £1,000 to £9,999.99 — £70
• Invoices £10,000 or more — £100

Note the "per invoice". A client who pays five invoices late owes five fixed sums. For freelancers billing monthly, this is often worth more than the interest — and unlike interest, it's claimable in full from day one overdue.

Right 3: Reasonable recovery costs beyond the fixed sum

If recovering the debt actually costs you more than the fixed sum — a debt collection agency's commission, a solicitor's letter before action, court fees — you can claim the reasonable excess on top. This was added by the 2013 amendment, and it matters because it changes the economics of escalation: the fixed sum is a floor, not a ceiling. A client who forces you to instruct an agency charging 15% of a £6,000 debt can be asked to bear that cost, not you.

Right 4: Six years to claim — including on invoices already paid late

In England and Wales, you have six years from the breach to bring a claim, like most contract debts. Two consequences follow, and the second one surprises almost everyone:

• An unpaid invoice from 2023 is still fully claimable today — principal, interest, and fixed sum.
• An invoice the client eventually paid, but paid late, still carries a claimable debt: the statutory interest for the late period plus the fixed sum. Paying the principal doesn't extinguish the rest.

That means you can go back through your records and total up what your late payers have actually cost you — and, if you choose, invoice them for it retrospectively. Whether you do so with a current client is a commercial call. With a former client who messed you about, it's often a very easy call.

Right 5: Court access without a solicitor

If chasing and a Letter Before Action both fail, you don't need to hire a lawyer to enforce any of the above. Money Claim Online — gov.uk's small claims portal — lets you issue a claim for a debt under £10,000 yourself, online, for a fee that scales with the claim size. Undefended claims (which most unpaid-invoice claims are) succeed at very high rates, and the mere issue of a claim is frequently what triggers payment. Our small claims guide walks through the process step by step.

What you can't do

Strong rights come with edges. Three things the law does not give you:

• Statutory charges on consumer invoices. The Act is B2B only. If your client is a private individual, you can only charge interest or late fees that were agreed in the contract — and they must be reasonable, not punitive.
• Penalty clauses. You can't bolt a £500 "late fee" onto a £400 invoice and expect it to survive scrutiny. Contractual charges must reflect a legitimate interest in being paid on time, not punish the client. The statutory amounts are safe precisely because Parliament set them; home-made penalties are where freelancers get into trouble.
• Holding paid work hostage. Sabotaging or withdrawing work the client has already paid for, as leverage over a separate unpaid invoice, is a quick way to turn a strong position into a counterclaim. Retention of work or IP is different — many freelance contracts state that copyright or deliverables only transfer on payment in full, and if your contract says that, it's real and legitimate leverage: the client using the work without having paid is then infringing. But that lever only exists if your contract creates it, so tread carefully and check your terms before relying on it.

The honest part: rights only work if you assert them

None of the above is self-executing. The Act doesn't send the chase email, and no client volunteers statutory interest unprompted. Most freelancers never claim a penny of it — not because they've weighed it up and declined, but because chasing feels confrontational, the maths feels fiddly, and there's always client work that feels more urgent than admin.

The cost of that isn't just the unclaimed interest. It's the training effect: a client who learns your due dates carry no consequences will pay you last, every time, because everyone else's invoices bite and yours don't. Conversely, freelancers who apply the statutory charges calmly and consistently report the same thing — after the first time, that client pays on time. The rights are less a revenue stream than a reputation: the supplier whose meter runs.

A worked example: the retrospective audit

Whether Dan invoices those clients retrospectively is up to him — many freelancers reserve the retrospective claim for ex-clients and simply start enforcing on live ones. The point of the audit is different: it converts "clients sometimes pay a bit late, it's fine" into a number, and the number is rarely fine.

Putting the rights to work

The pattern for using all five rights is the same: state the due date clearly, chase the day after it passes, restate the total with interest and the fixed sum, escalate predictably. The freelancers who struggle aren't missing knowledge at this point — they're missing follow-through, because every chase is a small act of confrontation they have to initiate themselves. That's the gap Hielda exists to close: it tracks your due dates, calculates the daily interest and fixed sums under the Act, and sends the escalating chases automatically from "the accounts team", so your rights get asserted on every invoice without you drafting a single email. However you do it — tool, template, or sheer discipline — the law has already done its half. The other half is showing up.