How to handle a client who wants to pay in instalments

It’s a scenario many freelancers and small business owners dread. You’ve completed the work, the invoice is significantly overdue, and your chasing efforts finally get a response: "Sorry, we're having some cash flow issues. Can we pay you in instalments?" It’s a delicate moment. On one hand, a payment plan is better than no payment at all. On the other, it risks turning a short-term debt into a long-term headache. This guide will walk you through how to handle this request professionally, structure a fair and firm instalment agreement, and protect your own cash flow without destroying the client relationship.

The Initial Reaction: Pause and Assess

Your first instinct might be relief ("At least they're not ignoring me!") or frustration ("Why couldn't they have told me this sooner?"). Both are valid, but neither should dictate your immediate response. Before you agree to anything, take a moment to assess the situation objectively.

Don't reply with an instant "yes." Instead, send a brief, holding email acknowledging their message. Something like:

"Thanks for letting me know your situation. I appreciate you getting in touch about this. Let me review the account and I'll come back to you shortly with a proposed way forward."

This buys you time to think strategically. Now, consider the context:

• The Client: Are they a long-standing, valuable client who has always paid on time before? Or are they a new client, or one with a history of slow payments? A good track record earns more flexibility.
• The Communication: Did they proactively raise the issue, or did you have to chase them for weeks to get this response? Proactive communication is a sign of good faith. Radio silence followed by a plea for terms is a red flag.
• The Amount: How significant is the overdue sum? A £15,000 invoice requires a much more formal approach than a £1,500 one.
• Your Cash Flow: Can your business absorb the delayed payment over several months? Be honest with yourself. Agreeing to a plan that puts your own business at risk is not a solution.

Your goal is to move from being a passive creditor to an active manager of the debt. An unstructured, verbal agreement to "pay when you can" is the worst possible outcome. You need to take control of the process.

Structuring a Watertight Instalment Agreement

If you decide that an instalment plan is a reasonable option, it must be on your terms. A vague email exchange is not enough. You need to create a simple, formal payment plan agreement. This isn't about being confrontational; it's about creating clarity and commitment for both parties.

A robust agreement has four essential pillars. Insist on all of them.

Pillar 1: Get It in Writing

The entire plan must be documented. This can be a formal PDF document or a very clear and detailed email that they must reply to, explicitly confirming their agreement to all points.

Your written agreement should clearly state:

1. Total Debt Acknowledged: The full, undisputed amount of the overdue invoice(s), including the invoice numbers. E.g., "This agreement pertains to the settlement of invoice #1024 for £5,000.00 and invoice #1031 for £2,500.00, for a total outstanding debt of £7,500.00."
2. Payment Schedule: The exact dates and amounts for each instalment. Be specific. Don't say "at the end of each month." Say "on or before the 28th day of July 2024, August 2024, and September 2024."
3. Number of Instalments: Keep the term as short as possible. For most debts, 3-6 months is a reasonable maximum. A plan that stretches for a year or more is rarely a good idea, as the risk of default increases over time.
4. Payment Method: Specify how they will pay. Is it a direct bank transfer to your usual account? Will you set up a direct debit via a service like GoCardless? The latter is often better as it puts you in control of collecting the payment on the due date.
5. The Default Clause: This is the most important part. What happens if they miss a payment? (We'll cover this in Pillar 4).

Pillar 2: Leverage Late Payment Legislation

As a UK business dealing with another business (B2B), you have powerful rights under the Late Payment of Commercial Debts (Interest) Act 1998. Many small businesses are reluctant to use these, fearing it will seem aggressive. However, in this context, they are your single greatest negotiation tool.

Under the Act, you are entitled to add:

1. Statutory Interest: This is currently 8% plus the Bank of England's base rate. You can find the current and historic base rates on the Bank of England's website to calculate the precise daily interest owed from the day the invoice became overdue.
2. Fixed Compensation: This is a one-off charge per overdue invoice, designed to cover the cost of recovery.

The compensation you can claim depends on the size of the invoice debt:

Invoice Value (per invoice)	Fixed Compensation Owed
Up to £999.99	£40
£1,000 to £9,999.99	£70
£10,000 or more	£100

How to use this as leverage:

Calculate the full amount of interest and compensation owed to date. Present this to the client as part of the total outstanding debt. Then, you can make them an offer:

"The total amount outstanding is £7,500. As per the Late Payment of Commercial Debts Act, we are also entitled to claim statutory interest and a £70 compensation fee, bringing the total collectible debt to [calculate the full amount].

However, as a gesture of goodwill, we will agree to waive all interest and compensation charges on the condition that the proposed instalment plan is completed in full and on time. If the plan is defaulted on, the full original amount plus all accrued interest and fees will become immediately due."

This simple clause does three things:

• It demonstrates you know your rights.
• It frames you as reasonable by offering to waive the fees.
• It creates a strong financial incentive for them to stick to the plan.

Pillar 3: Acknowledge the Original Debt

Your written agreement should contain a sentence making it clear that this payment plan is a temporary arrangement to settle an existing debt, not a new form of credit that replaces the original invoice.

Include a phrase like:

"This payment plan does not novate or replace the original debt incurred under invoice[s] [Number(s)]. It is an agreed-upon method for settling the outstanding balance. The original invoice[s] remain due and payable until the balance is cleared in full."

This is important. If they default, you want to be pursuing them for the original, simple invoice debt, not getting bogged down in arguments about a "new" credit agreement you gave them.

Pillar 4: The Default Clause is Non-Negotiable

This is what gives the agreement its teeth. The default clause must be unambiguous. It should state that if any single instalment is late by more than a specified number of days (e.g., 3-5 business days), the agreement is void.

A good default clause looks like this:

"Should any instalment payment be late, missed, or less than the agreed amount, this payment plan will be considered null and void. At that point, the entire remaining balance of the original invoice(s), plus all statutory interest and compensation fees previously waived, will become immediately due and payable in full. We reserve the right to commence formal debt recovery proceedings without further notice."

This removes any ambiguity. There are no second chances on the payment plan. It is a one-time offer of forbearance.

Managing the Instalment Plan

Once the agreement is signed (or confirmed via email) and you have received the first payment, the work isn't over.

Track Payments Diligently: Diarise the payment dates. Don't wait a week to realise a payment is late. Check your bank account on the day it is due.

Act Immediately on a Default: The moment a payment is late, you must enforce the default clause. The same day, send an email stating:

"Further to our payment plan agreement dated [Date], the instalment of [£Amount] due on [Date] has not been received. As per the terms of the agreement, the plan is now void.

The full remaining balance of [£Amount] plus all previously waived statutory charges is now immediately due. Please remit payment for [Total £Amount] within 7 days to avoid the matter being passed to our debt recovery agents."

It may feel harsh, but any hesitation on your part undermines the entire agreement and signals that your deadlines are flexible. You will be back to square one, but this time the client knows you don't follow through on your own terms.

While you'll need to manage a formal instalment plan manually, preventing other invoices from reaching this stage is key. This is where automation can be a huge help. Tools like InvoiceReminder can automate the initial, often awkward, chasing process for all your other clients. By connecting to your accounting software (like Xero, QuickBooks, Sage, or FreeAgent), it sends out scheduled, polite reminders as soon as an invoice is due, escalating the tone only if it remains unpaid. This frees you up to focus your manual efforts on complex cases like this one, while ensuring other invoices don't slip through the cracks.

What If an Instalment Plan Isn't Right?

Sometimes, an instalment plan is not the answer.

• If the client refuses to sign a formal agreement: This is a major red flag. It suggests they have no real intention of sticking to the plan. In this case, do not agree. Treat it as a refusal to pay and move towards more formal recovery options.
• If the debt is small: For a debt of a few hundred pounds, the administrative effort of managing a payment plan may not be worthwhile. In this case, you could offer a small discount (e.g., 5-10%) for immediate settlement in full. "If you can clear the full £500 balance within 48 hours, we can accept £475 as final settlement."
• If you cannot afford to wait: If your own cash flow is critical, you must prioritise your business's health. Politely decline the instalment request and explain that you require full payment, directing them to the formal options if they cannot comply.

If you cannot reach an agreement, your next steps would typically be a formal Letter Before Action, followed by using the Money Claim Online (MCOL) service for a court judgment if the debt remains unpaid.

The Final Word: Clarity Protects Everyone

Dealing with a client who can't pay is stressful. But remember: you are running a business. Establishing a clear, fair, and firm process for payment plans is not about being unkind; it's about being a professional.

A well-structured agreement protects you by ensuring you have a clear path to getting paid and defined consequences for non-payment. It also protects the client by giving them a manageable, structured path out of debt without the threat of immediate legal action, provided they honour their commitment. By taking control and defining the terms, you turn a potentially chaotic situation into a managed process.

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Frequently asked questions

Can I legally charge interest on an overdue invoice in the UK?

Yes, for B2B transactions, the Late Payment of Commercial Debts (Interest) Act 1998 allows you to charge statutory interest, which is 8% plus the Bank of England's base rate. You can also claim a fixed sum in compensation (£40, £70, or £100 depending on the debt size) for each late invoice.

What should I do if a client refuses to sign a payment plan agreement?

A refusal to commit to a formal, written plan is a serious red flag. You should not agree to an informal or verbal arrangement. Politely insist that a written agreement is necessary for clarity and to protect both parties. If they still refuse, you should consider this a refusal to pay and proceed with your standard debt recovery process, such as sending a Letter Before Action.

How long should an instalment plan typically last?

Aim to keep the payment plan as short as possible. For most small to medium-sized business debts, a period of three to six months is standard. A plan stretching beyond six months significantly increases the risk of a default part-way through. Avoid agreeing to very long plans with very small payments.

Do I need a solicitor to draft an instalment agreement?

For most straightforward cases involving typical invoice amounts, a clear and comprehensive email that details all the key terms (total debt, schedule, default clause) and which the client formally agrees to by reply is usually sufficient. For very large six-figure debts or complex situations, seeking advice from a solicitor to draft a more formal agreement is a wise investment.

Should I stop working for a client who is on a payment plan?

In most cases, yes. You should pause any further work or place their account on hold until the overdue balance is completely cleared. Extending further credit to a client who is already struggling to pay you is a significant financial risk. Explain it to them professionally as a standard policy to pause new work while an old balance is being settled.

What if my client is a consumer, not a business?

The rules are different for consumer (B2C) debt. The Late Payment of Commercial Debts Act does not apply. You can only charge interest if it was a term in your original signed contract. The process for recovery is also subject to different regulations, and you must be careful to follow consumer credit and FCA guidelines on treating customers fairly.

Stop chasing, start automating

Manually chasing overdue invoices costs valuable time that you could be spending on growing your business. An instalment plan is a last resort; preventing invoices from becoming seriously overdue in the first place is the best strategy for healthy cash flow.

InvoiceReminder helps UK small businesses, freelancers, and accountants do just that. It connects to your Xero, Sage, QuickBooks, or FreeAgent account and automates the entire invoice chasing process. You can set up customisable schedules of email reminders—from friendly nudges to firm final notices—that go out automatically, so you don't have to think about it. The Free plan currently includes unlimited email reminders at no cost, with no card required to sign up.

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