How to Follow Up on an Unpaid Invoice on WhatsApp: Scripts for Day 1, Day 7, Day 14 and the Final Notice
The Short Answer
Chase on a schedule, not on a feeling. A follow-up chain that works looks like this: a short friendly note three days before the due date, a "this may have slipped" message on day 1 overdue, a firmer one on day 7 that asks for a specific payment date, a day 14 message that states your terms and what happens next, and a final notice around day 30 before you escalate. Every message should name the invoice number, the amount, the due date and one way to pay, and should stay short: a paragraph of apology reads as an invitation to keep waiting. Tone is not the lever people think it is. The lever is being predictable, because a client who knows you follow up on a fixed rhythm pays you earlier than one who has learned that you go quiet. Below are the scripts, the interest you can legally claim in the UK, the EU and India, and how to set the whole chain in one message so you are not the one having to remember day 7.
The Cadence, Before the Wording
Most advice on this topic is about softening the language. That is the smaller half. The bigger half is that late invoices are chased in bursts of frustration, weeks apart, which teaches a slow payer that nothing happens on any particular day. A fixed rhythm teaches the opposite.
| When | What the message does | Tone |
|---|---|---|
| 3 days before due | Confirms the invoice arrived and is scheduled for payment | Helpful |
| Day 1 overdue | Assumes it slipped, gives them the easy out | Friendly |
| Day 7 | Asks for a specific date, not a reassurance | Direct |
| Day 14 | States the terms, names the consequence | Formal |
| Day 30 | Final notice before escalation | Final |
Three rules hold across all five. Never let a chase be the first contact about payment terms: terms argued about after the work is a losing position, so they belong in the quote. Always name the invoice number and amount, so a client can forward your message to their accounts person without replying to you first. And always propose something, a date or a payment link or a split, because a message that only expresses disappointment gives the other person nothing to action.
The Scripts
Replace anything in square brackets. All of these are written to be sent as one WhatsApp message, and all of them are deliberately shorter than the email equivalent.
1. Three days before the due date
This one message removes a large share of late payments, because a great many are not decisions at all, they are an invoice sitting unopened in a shared inbox. It is also the only message in the list that costs you no goodwill whatsoever.
2. Day 1 overdue
"I am guessing it slipped" is doing real work. It gives a client who forgot a way to fix it without embarrassment, which is faster than any amount of firmness at this stage.
3. Day 7 overdue
The shift here is from asking for reassurance to asking for a date, and it is the most important shift in the whole sequence. "Soon" and "I will check with accounts" are not answers you can follow up on; "the 22nd" is, and if the 22nd passes you have a concrete thing to point at rather than a feeling.
4. Day 14 overdue
Say "I would much rather not apply it" and mean it. The purpose of naming interest at day 14 is to move the invoice up someone's list, and in most cases that is all it does. What it should never be is a surprise: if your terms never mentioned interest, this line is weaker, which is an argument for fixing the terms on the next job rather than bluffing on this one.
5. Day 30, the final notice before escalation
Only write the consequence you are actually willing to carry out. A threat you drop is worse than no threat, because it tells the client exactly how far they can push the next invoice too.
6. When they promised a date and it passed
Short, factual, no accusation, and it quotes their own commitment back to them. This is also the message that most benefits from having the previous ones in the same WhatsApp thread, where the dates are all visible and nothing has to be reconstructed from memory.
7. When the client has gone completely silent
Changing channel is often what breaks the silence, and saying you are about to do it is both fair and effective. Do not chase silence on WhatsApp alone for weeks: one person's phone is not the same as a company's accounts payable process.
What not to send
- A long apology for asking. "So sorry to bother you again" invites another week of waiting. You are asking to be paid for delivered work.
- A voice note. Nothing your client needs to forward to their finance team can be forwarded.
- Anything after 8pm, or on a weekend. It reads as pressure rather than process, and process is what you want it to read as.
- A group message. Never put a payment chase in a group your client's team shares. It humiliates a person who may be one approval away from paying you.
What the Law Actually Gives You
People bluff about interest because they do not know what they are entitled to. In several places you are entitled to more than you think, without a clause in your own contract. This is a summary of public guidance, not legal advice, and the amounts change.
United Kingdom
Under the Late Payment of Commercial Debts (Interest) Act 1998, a business supplying another business can claim statutory interest of 8% a year above the Bank of England base rate, plus a fixed sum of £40, £70 or £100 depending on the size of the debt, and reasonable recovery costs beyond that fixed sum where they exceed it. The rate is set for half-year blocks using the base rate in force at the end of the previous half year, which puts it at 11.75% a year for invoices falling overdue between 1 July and 31 December 2026 (a 3.75% base rate plus the 8% margin). See Xero's UK guide, this rate breakdown, and the Small Business Commissioner's interest calculator guidance for the current half-year figure before you quote one.
There is also a change coming. The Small Business Protections (Late Payments) Bill was announced in the King's Speech on 13 May 2026 and introduced to Parliament on 19 May 2026. As reported by KPMG, ICAEW and Baker McKenzie, it proposes a statutory maximum payment term of 60 days for large businesses paying smaller suppliers (30 days for public authorities), with an intention to tighten that to 45 days within five years, mandatory interest on late payments, a ban on withholding retentions in construction, and stronger investigation and penalty powers for the Small Business Commissioner. It is a Bill, not law. It was still before Parliament as of this writing, so nothing in it is something you can invoke in a message today.
European Union
Directive 2011/7/EU on combating late payment sets the floor across member states, and the European Commission's own summary states it plainly: public authorities must pay within 30 days (60 in exceptional circumstances), businesses must pay other businesses within 60 days unless they expressly agree otherwise and that is not grossly unfair, interest runs at a minimum of 8 percentage points above the European Central Bank reference rate, which is updated on 1 January and 1 July, and a fixed minimum of €40 is owed for recovery costs. The part most people miss: the entitlement is automatic from the day after the payment period ends and does not require you to have sent a reminder first.
India
If you are registered as a micro or small enterprise, the MSMED Act 2006 is stronger than most freelancers realise. Section 15 caps the agreed payment period at 45 days from acceptance or deemed acceptance of the goods or services, and sets 15 days where there is no written agreement. Section 16 makes a late buyer liable for compound interest with monthly rests at three times the bank rate notified by the Reserve Bank of India. Disputes can be filed online and without a lawyer through MSME Samadhaan, the ministry's delayed payment monitoring system, which routes the case to a Micro and Small Enterprise Facilitation Council; Udyam registration is the prerequisite. Sources: the Ministry's own legal framework note on delayed payments and the India.gov.in service listing for MSME Samadhaan.
Two practical notes. First, this is leverage you have without writing any clause yourself, which is exactly what a day 14 message needs. Second, it cuts the other way too: Indian buyers have their own tax reason to clear micro and small enterprise invoices inside the window, so a polite mention of your registration status is often more effective than a threat.
Set the Whole Chain Once
Here is the failure that costs freelancers the most money, and it is not tone. You send the invoice, you remember to chase on day 1 because the irritation is fresh, and then day 7 lands in the middle of other work and you chase on day 19 instead. The client learns the real cadence, which is "whenever he notices".
So set the dates on the day you send the invoice, while you are still thinking about it. A recurring weekly sweep is the cheapest version, one reminder that makes you look at the list rather than one per invoice:
For a single invoice you actually care about, the per-stage version is four sentences typed once: remind me on 3 October at 10am to check if invoice 1042 is paid, then the same for the 10th, the 17th and the 31st. Reminders can be closed with a one-word reply, so a paid invoice takes one done to clear and a chased one takes snooze until the date they promised.
The bot can also hold the chase message itself, so the reminder arrives with the text ready and a link that opens the client's chat with it filled in: schedule message to 12024909133 on Monday at 10am: Hi Mehul, invoice 1042 is a week overdue, could you give me a date? WhatsApp permits no app to send from your number, so the last step is always your thumb, which is the whole design of scheduled messages here. The version of this applied to retainers and renewals is in our guide to automated invoice reminders and on the freelancers page.
No app, no account. Save the number, send a message, done.
The Four Changes That Stop This Happening Again
Chasing well is a skill you would rather not need. The invoices that never go overdue tend to have four things in common:
- Terms agreed in the quote, in writing, including interest. The day 14 message is only as strong as what the client agreed to before the work. This is the single highest-value change on the list.
- A deposit. Anything from 25% to 50% up front filters out the clients who were never going to pay and caps what you can lose on the ones who do not.
- The invoice sent to the right person. Ask, at the start, who receives invoices and whether there is a portal or a purchase order number. A missing PO number is a genuinely common reason a correct invoice sits unpaid for a month.
- A cadence you do not have to remember. If the follow-up depends on you feeling annoyed on the right day, it will not happen on the right day.
One thing is not on the list: being nicer. Politeness is worth keeping, but being specific, dated and predictable is what gets you paid.
Frequently Asked Questions
How do I politely ask for payment of an overdue invoice on WhatsApp?
Send one short message that names the invoice number, the amount, the due date and how to pay, assumes the delay was an oversight, and asks for a specific payment date. For example: "Hi Priya, invoice #1042 for 45,000 was due yesterday and I do not see it in yet. Could you confirm it is in the payment run, or tell me if you need it resent?" Skip the long apology for asking, since it invites another week of waiting.
How often should I follow up on an unpaid invoice?
A workable rhythm is three days before the due date, then day 1, day 7, day 14 and day 30 overdue, each with a different job: flag, assume it slipped, ask for a date, state the terms, final notice. Being predictable matters more than being firm, because a client who knows you follow up on fixed days pays earlier than one who has learned that you go quiet.
Is it OK to chase an invoice on WhatsApp instead of email?
Yes, and it is often faster, but do not make it your only channel. Keep the invoice itself on email so there is a formal record with the document attached, use WhatsApp for the nudge, and switch to a phone call or the client's accounts address if WhatsApp goes silent for more than a couple of weeks. One person's phone is not the same as a company's accounts payable process.
Can I charge interest on a late invoice?
Often yes, even without a clause of your own. In the UK the Late Payment of Commercial Debts (Interest) Act 1998 gives a business statutory interest of 8% above the Bank of England base rate plus a fixed sum of £40, £70 or £100 by debt size. Across the EU, Directive 2011/7/EU sets a floor of 8 percentage points above the ECB reference rate plus €40 in recovery costs, automatically and without needing to have sent a reminder. In India, the MSMED Act 2006 makes a buyer liable for compound interest at three times the RBI notified bank rate. Check the current rate and your own position before you quote a number in a message.
What is the 45-day rule for MSME payments in India?
Section 15 of the MSMED Act 2006 provides that a buyer must pay a registered micro or small enterprise on the agreed date, and that the agreed period can in no case exceed 45 days from acceptance or deemed acceptance of the goods or services. Where there is no written agreement the period is 15 days. Section 16 then makes a late buyer liable for compound interest with monthly rests at three times the bank rate notified by the Reserve Bank of India, and a dispute can be filed free and without a lawyer on the MSME Samadhaan portal if you hold Udyam registration.
Will the new UK late payment law force clients to pay in 60 days?
Not yet. The Small Business Protections (Late Payments) Bill was announced in the King's Speech on 13 May 2026 and introduced to Parliament on 19 May 2026, and it proposes a 60-day maximum payment term for large businesses paying smaller suppliers, 30 days for public authorities, with an intention to reach 45 days within five years. It was still going through Parliament as of the end of September 2026 and is not law, so you cannot invoke it in a follow-up message today.
What should I do when a client promises a payment date and misses it?
Quote their own commitment back to them, factually and without accusation: "You mentioned invoice #1042 would be paid on 22 October and it has not come through. Did the payment fail, or has the date moved?" Then ask for the new date and write it down. A missed promise is also the point at which the day 14 and day 30 messages become appropriate even if the calendar days say otherwise.
Can NagMeLater chase clients for me automatically?
No, and it does not pretend to. It reminds you, and it can hold the chase message so that at the time you chose it arrives with the text ready and a link that opens that client's chat with the message filled in, which you then send yourself. WhatsApp does not let any app send from your personal number. It also never reads your chats or your email, so it cannot know whether the money arrived; you reply done when it has.