How to chase an unpaid invoice without damaging the relationship
A relationship-preserving chase framework for UK tradespeople - why most unpaid invoices come from forgetfulness or cashflow rather than refusal, the five-stage escalation ladder, the diagnostic question to ask at day 14, and when to invoke the Late Payment Act without burning the customer.
The conversation most UK tradespeople dread is the day-30 chase. The work was done well, the customer was pleased, the invoice was sent the same day - and three weeks later the bank account is still empty. Every day you wait, two things happen: the chance of payment drops slightly, and the chance of damaging the relationship rises sharply. The trick is not to chase harder; it is to chase in a way that the customer hears as professional rather than aggressive.
The good news: most UK domestic invoices that go past 14 days are late because the customer genuinely forgot, not because they are refusing to pay. The bad news: tradespeople who treat every late invoice as refusal escalate too fast and burn the relationship before they have asked the diagnostic question. Tradespeople who treat every late invoice as forgetfulness escalate too slowly and end up writing off real cashflow problems. The framework below is the middle path - five escalation stages, each with a specific tone, a specific window, and a specific message.
This is the Pain/problem deep-dive that pairs with the template hub (article #3, the 14 polite late-payment messages). The hub gives you the wording for each stage. This article gives you the framework for picking the right stage, asking the right diagnostic, and knowing when to escalate beyond polite without losing the customer.
Why most unpaid invoices come from forgetfulness, not refusal
Tradespeople who default to "they are trying to avoid paying" are wrong on most domestic invoices. The breakdown of reasons UK invoices go past their due date is roughly: 55% genuine forgetfulness, 20% cashflow timing (waiting on their own customer to pay them), 15% query or dispute the customer has not raised yet, 8% genuine difficulty paying, and 2% deliberate avoidance. Your chase strategy needs to match the most likely cause, which is forgetfulness - not the worst case.
- Forgetfulness (55%) - the invoice landed in the customer's email on a busy day, got pushed below the fold, and they meant to come back to it. A polite reminder solves this in one message.
- Cashflow timing (20%) - the customer is a small business waiting on their own customer to pay them before they can pay you. The right response is empathy plus a structured payment plan, not pressure.
- Unraised query or dispute (15%) - the customer has a quiet objection (a snag, a variation they did not expect, a price they wanted to query) and is sitting on the invoice rather than raising it. The chase has to flush the objection out before pressing for payment.
- Genuine difficulty (8%) - illness, redundancy, family emergency. Rare but real. Cannot be solved by chasing harder; needs a conversation about timing.
- Deliberate avoidance (2%) - the customer never intended to pay or always pays late on principle. Real but rare; chasing strategy is different (formal escalation faster, less relationship preservation).
The five-stage escalation ladder - tone and timing
The right chase strategy is graduated. Same chaser, different tone at each stage, calibrated to the cause that is most likely at that point in the timeline. The five stages below cover the first 45 days; beyond day 45 the situation changes from chasing to dispute resolution.
- Stage 1 - Day 0 (invoice sent). Polite warm "invoice on the way to your email, bank details on it, any queries shout" message. Sets the tone for the rest of the chase. The Pillar 3A hub article covers the wording.
- Stage 2 - Day 7 (gentle nudge). Casual one-line WhatsApp or email. "Hi [name], just a quick nudge on the invoice from last [day of job] - any chance you can settle that this week? Cheers." Assumes forgetfulness; reads as a reminder, not a demand. Most UK domestic invoices pay within 48 hours of this message.
- Stage 3 - Day 14 (the diagnostic chase). Slightly firmer, dated, ASKS the diagnostic question. "Hi [name], the invoice from [date] is showing 14 days past due. Just want to check - is there anything outstanding from the job that I need to look at, or is it the invoice itself that needs sorting? Happy to chat if there's an issue, otherwise just want to get it tied off." The diagnostic question separates the forgetfulness cases (which settle now) from the query/dispute cases (which surface here so you can resolve them).
- Stage 4 - Day 21 (named consequences, no Act mention yet). "Hi [name], I have not heard back on the [date] invoice. Can you let me know your plan for payment by [end of this week]? If there is a cashflow issue I am happy to discuss a structured payment plan; if there is a dispute, please raise it now so I can address it. If I do not hear back by [date], I will need to escalate the next step." Names the next step without invoking the Late Payment Act; leaves the door open for cashflow conversations.
- Stage 5 - Day 30 (Late Payment Act mention). "Hi [name], the invoice from [date] is now 30 days past due. Under the Late Payment of Commercial Debts (Interest) Act 1998, I would be entitled to add statutory interest of 8% above the Bank of England base rate, plus a fixed compensation fee. I would much rather just get the invoice cleared - please let me know by [date] when payment will be made. If I do not hear back, I will need to take the next step." The credible threat that gets paid; rarely needs to be actually invoked because the mention itself triggers payment.
The diagnostic question at day 14 - the move that prevents most disputes
The single highest-leverage move in the whole escalation ladder is the diagnostic question at stage 3 (day 14). Most tradespeople skip it - they just send a firmer version of the day-7 chase. The diagnostic separates two very different problems: an invoice that is forgotten (easy to fix) and an invoice that is being sat on because of an unraised concern (impossible to fix until you know what the concern is).
- The right question - "Just want to check - is there anything outstanding from the job that I need to look at, or is it the invoice itself that needs sorting?" Open-ended, no implied blame, gives the customer a clean opening to surface the concern.
- If they reply "all good, just busy" - go back to the forgetfulness track. The diagnostic worked; chase track resumes at stage 4 if payment does not land within the week.
- If they reply with a snag, a query, or a price concern - pivot to dispute-resolution mode. The invoice is not the problem; the unraised issue is. Resolve the issue first; chase the invoice second.
- If they do not reply within 48 hours - assume the issue is forgetfulness compounded by avoidance and move to stage 4. The non-reply itself is data.
- Almost every relationship-damaged chase comes from skipping this question. The tradesperson assumed forgetfulness; the customer was actually annoyed about a snag they never raised; the firmer chase landed as bullying because the underlying issue was never addressed.
When to invoke the Late Payment Act and when to hold off
The Late Payment of Commercial Debts (Interest) Act 1998 is the most powerful tool in the chase toolkit - and the most damaging if used too early or against the wrong customer. The wording moves the conversation from polite-reminder to legal-claim in one sentence, and customers feel that escalation viscerally. Use it correctly and you get paid; use it on a day-14 chase to a domestic customer and you burn the relationship.
- Use it when - the customer is a business (B2B work), the invoice is at least 30 days past due, you have already asked the diagnostic question and received no substantive reply, and the customer has not raised a genuine dispute. The Act applies to B2B work only; on domestic invoices the threat is informal rather than legally binding (but customers do not usually know that, and the wording still works).
- Hold off when - the customer is a domestic customer in the first 30 days (use the diagnostic chase first), the customer has raised a genuine query you have not resolved (fix the query first), there is a known cashflow issue you have not negotiated around (offer a payment plan instead), or you are early in a long-running relationship where preservation matters more than this one invoice.
- The wording that works - "Under the Late Payment of Commercial Debts (Interest) Act 1998, I would be entitled to add statutory interest of 8% above the Bank of England base rate, plus a fixed compensation fee. I would much rather just get the invoice cleared - please let me know by [date] when payment will be made." Reference the Act by name, state the interest rate, signal you would prefer to settle without it. The "I would much rather just get the invoice cleared" line is the magic phrase - it gives the customer a graceful way to pay without losing face.
- What actually happens after the mention - in roughly 80% of B2B cases, payment lands within 7 days of the Late Payment Act mention without you actually applying the interest. The Act mention is a credible threat, not a billing instruction. Apply the interest only if you genuinely intend to pursue the debt to small claims; otherwise the mention does the work.
When chasing has not worked - what to do at day 45+
Most chases settle by day 30. The roughly 10% that do not need a different framework - escalation beyond polite, but still calibrated to the cause. The four paths below cover the realistic options for UK trades; pick the one that matches the size of the debt and the customer relationship.
- Mediation or direct call - for debts under £500 with a customer you might work with again, a phone call ("I want to find a way through this, can we talk?") often resolves what email cannot. Schedule it, prepare a payment-plan option, lead with empathy.
- Money Claim Online (MCOL) - for UK debts up to £10,000 from non-paying customers where mediation has failed. Court fee scales with debt size (£35-£455). Fast, can be done without a solicitor, judgement is enforceable. Best for clear-cut cases where the customer has gone quiet rather than raised a genuine dispute.
- Debt-collection agency - for debts £500-£5,000 where MCOL is overkill and you have no relationship to preserve. Agencies charge 10-15% of recovered funds; some operate on a no-recovery-no-fee basis. The customer's credit file will note the recovery action.
- Write off - for debts under £200 where the time and emotional cost of pursuing exceeds the value, OR for any debt where pursuing would damage a relationship worth more than the debt. Writing off is a real strategic choice, not a failure - learn from it, tighten deposit terms on future work, move on.
After payment lands - the relationship-recovery move
A relationship survives a difficult chase if the moment of payment is handled gracefully. A "thank you for sorting that" message the day payment clears is the single move that prevents the chase from becoming the thing the customer remembers about you. Most tradespeople feel relieved and forget; the ones who send the recovery message keep the customer for the next job.
- Recovery message template - "Hi [name], just to confirm payment has landed, thanks for getting that sorted. Glad we can put the [project] to bed properly. Any questions in the next 12 months, just shout - and thanks again for the work." Warm, brief, future-oriented.
- What NOT to do - never mention the lateness, never make it a teachable moment, never imply the customer was difficult. The chase happened; it is over; the relationship moves forward from this message.
- For B2B customers - same recovery message but signal you have updated your records so the next invoice does not need the same chase. "Have noted on your account, will send the next invoice through the same channel so it lands the right place." Reads as professional rather than passive-aggressive.
Automating the chase - the tool that takes the emotion out
The cheapest way to make chases less stressful is to automate the early stages. The day-7 nudge does not need to be a decision; it should fire automatically the moment the invoice crosses the 7-day mark. The day-14 diagnostic still needs human judgement, but the system that triggers the prompt at the right moment removes the "I knew I should have chased this" guilt that builds up on busy weeks.
- Automated day-7 nudge - set up in any trade CRM with reminder workflows. Fires the polite-nudge template automatically; you can edit or cancel if context warrants. Roughly 60% of UK domestic invoices settle within 48 hours of the automated day-7 nudge without you ever touching the chase.
- Manual day-14 diagnostic - this stage needs you. The diagnostic question is the highest-leverage move in the ladder and a generic auto-message will not get the same response. Treat day-14 as the moment you intervene.
- Automated day-21 escalation - back to automation. Slightly firmer message with the named consequence framing fires from the system on day 21 if no payment has landed.
- Manual day-30 Late Payment Act mention - back to you. This message needs human judgement on whether to invoke (B2B + no genuine dispute) or hold (domestic + relationship-sensitive). Never automate the Act mention; the risk of sending it to the wrong customer is too high.
- CMA ships invoice reminders as a built-in workflow on the Invoices feature - the stage 2 and stage 4 automation handles the polite-nudge and named-consequence chases, and the dashboard surfaces the day-14 and day-30 prompts for you to handle manually.
Un flux de travail simple pour de meilleurs devis
Default to forgetfulness as the cause until proven otherwise - 55% of late UK invoices land there.
Use the five-stage ladder: day 0 (invoice sent), day 7 (gentle nudge), day 14 (diagnostic), day 21 (named consequence), day 30 (Late Payment Act mention).
Ask the diagnostic question at day 14 - this is the highest-leverage move and prevents most relationship-damaged chases.
Invoke the Late Payment Act only on B2B invoices at day 30+ with no genuine dispute raised; the mention itself triggers payment in ~80% of cases.
At day 45+, pick a path - mediation, MCOL, debt-collection agency, or write-off - based on debt size and relationship value.
Send the recovery message the day payment lands; never mention the lateness in it.
Automate stages 2 and 4 (days 7 and 21) in your trade CRM; keep stages 3 and 5 (days 14 and 30) manual because they need human judgement.
Chasing an unpaid invoice well is mostly about correctly diagnosing why it is late, then matching the tone of the chase to the cause. Default to forgetfulness on day 7. Ask the diagnostic question on day 14. Name consequences on day 21. Reference the Late Payment Act on day 30 if B2B. Pick an escalation path beyond day 45. Send the recovery message the day payment lands. The customer hears the whole sequence as professional rather than aggressive, and most relationships survive intact.
For the wording at each stage, see the polite late-payment templates hub. For the tool that automates stages 2 and 4 and surfaces the manual stages at the right time, see the Invoices feature page - the built-in reminder workflow handles the cadence so you do not have to remember which invoice needs which chase this week.
Questions fréquentes
How do I chase an unpaid invoice politely as a UK tradesperson?
Use a graduated five-stage ladder: day 0 (invoice sent with warm cover note), day 7 (one-line gentle nudge assuming forgetfulness), day 14 (diagnostic chase asking "is there anything outstanding from the job, or is it the invoice that needs sorting?"), day 21 (named consequence without invoking the Late Payment Act yet), and day 30 (Late Payment Act mention for B2B invoices). Most UK domestic invoices settle by day 14; the ones that do not settle by day 30 need escalation paths beyond polite.
Why do most unpaid invoices stay unpaid?
Roughly 55% of UK invoices past 14 days are late because the customer genuinely forgot. 20% are cashflow timing (the customer is waiting on their own customer). 15% are unraised queries or disputes the customer is sitting on. 8% are genuine difficulty. Only 2% are deliberate avoidance. Your chase strategy needs to match the likely cause, which is forgetfulness, not the worst case. The day-14 diagnostic question is the move that separates forgetfulness from disputes.
When should I mention the Late Payment Act in a chase?
On B2B invoices at day 30+ where you have already asked the diagnostic question and received no substantive reply. The Late Payment of Commercial Debts (Interest) Act 1998 applies to business-to-business work only; on domestic invoices the threat is informal but the wording still works because most customers do not know the distinction. The phrase "I would much rather just get the invoice cleared" after referencing the Act is the magic line - it gives the customer a graceful way to pay without losing face. Roughly 80% of B2B cases pay within 7 days of the Act mention without you actually applying the interest.
What do I do if a customer still has not paid after 45 days?
Pick one of four paths based on debt size and relationship value. Mediation/direct call for debts under £500 with customers you might work with again. Money Claim Online (MCOL) for UK debts up to £10,000 from non-paying customers - fast, can be done without a solicitor, court fee £35-£455 depending on debt size. Debt-collection agency for £500-£5,000 debts where MCOL is overkill (agencies charge 10-15% of recovered funds). Write off any debt under £200 or where the relationship is worth more than the money - writing off is a real strategic choice, not a failure.
Can I automate invoice chasing as a sole trader?
Automate stages 2 and 4 (the day-7 polite nudge and the day-21 named-consequence chase) because they are generic enough that a saved template fires correctly without human judgement. Keep stages 3 and 5 manual (the day-14 diagnostic question and the day-30 Late Payment Act mention) because both need human judgement on tone and context. Roughly 60% of UK domestic invoices settle within 48 hours of the automated day-7 nudge without you ever touching the chase, so the automation handles the bulk of forgetfulness cases and leaves you to handle the harder ones.
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