Chasing an unpaid invoice is awkward for anyone, but it stings a little more when you run an accounting or bookkeeping practice. Clients trust you to keep their cash flow healthy, so watching your own receivables sit untouched feels like the cobbler’s kids going without shoes. Usually you don’t need a hard conversation to fix it. A clear, polite email at the right moment does the work, and once your accounting software is sending reminders on a schedule, you’ll rarely write one from scratch.
Late payment is common enough that nobody should take it personally. The 2026 Intuit QuickBooks Small Business Late Payments Report, a survey of 1,305 US business owners, found that 59% had invoices more than 30 days overdue, up from 47% a year earlier. Those with unpaid invoices were owed US$17.7K on average.
Set terms that make the reminder easy
Payment expectations are easiest to set when nothing is owed yet. While you’re agreeing the scope and the fee, the due date and what happens if it’s missed are simply part of the arrangement, and the client can raise any concerns before they sign. Raise the same points for the first time when an invoice is three weeks overdue and they read as pressure, and the client can fairly say they never agreed to them.
So settle these in the engagement letter or client agreement, before the work starts:
- Your rates, and whether you need a deposit or a retainer
- When payment is due: on receipt, within 7 days, within 30 days
- How clients can pay you, including the quickest options
- What happens if an invoice goes unpaid, such as a late fee or paused work
Once they’re agreed, every later email has something to point back to. A reminder refers to terms the client signed up to, and a late fee or a pause in work is what you both agreed would happen, so you aren’t left justifying it on the spot.
The due date itself deserves some thought. In the same QuickBooks survey, 55% of businesses on 30-day terms had overdue invoices, compared with 26% of those asking for payment immediately. That’s an association, not proof that shorter terms make clients pay faster, but it’s a good reason not to default to 30 days out of habit. Seven or fourteen days suits most small clients and one-off jobs. A larger client with its own approval process and monthly payment run may genuinely need longer, and agreeing terms that match how they pay avoids a string of reminders that were never going to work.
Then make the invoice easy to act on. Build it from tracked time and send it as soon as the work or billing period is done, while the client still remembers it. State the due date and total clearly, and put the payment details where nobody has to hunt for them. For keeping track of everything once it’s sent, our invoice management guide walks through a weekly review.
Outstanding or overdue: which email are you sending?
Once the invoice is out, the wording of each follow-up changes as it ages, because the job of the email changes. Being clear about that job before you write keeps each message short, and stops a reminder sounding sharper or softer than the situation calls for.
Before the due date, you’re making it easy to pay: the amount, the date and how to pay, with a fresh copy of the invoice in case the first one went astray.
In the first few days after the due date, you’re finding out whether something has gone wrong, so an early reminder invites a reply as much as a payment. If the invoice is stuck somewhere on the client’s side, you want to hear about it now, while it’s an easy fix.
Once an invoice is clearly overdue and an earlier reminder went unanswered, you want a commitment. A specific payment date, an agreed plan or a reason you can act on all move things forward, where another open-ended “just checking in” tends to meet the same silence as the first.
The final notice makes the next step clear so the client has to decide. Naming the consequence they agreed to in your terms gives them a plain choice and a date to make it by.
Before you write, check which stage each invoice has reached. The Aged Receivables report in Xero and the accounts receivable ageing summary in QuickBooks Online group unpaid invoices by how long they’ve been outstanding, so you can see which job each reminder needs to do.
A reminder schedule you set once
Every invoice needs the same handful of messages at roughly the same points, so decide the schedule once and let every invoice follow it.
| Stage | When to send | Tone | |
|---|---|---|---|
| Invoice | When the work or billing period is done | Friendly and informative | 1 |
| Heads-up | About 3 days before the due date | Light and helpful | 2 |
| Nudge | 3 to 7 days after the due date | Benefit of the doubt | 3 |
| Follow-up | About 14 days overdue | Direct and courteous | 4 |
| Final notice | About 30 days overdue | Firm, with a clear next step | 5 |
Adjust it to the client in front of you. A long-standing client who always pays a few days late may only need the nudge. A new client, or one with a history of slipping, gets the full sequence. New Zealand’s guidance on getting paid on time suggests following up as soon as an invoice is late, for example with a short, polite email two business days after the due date. If you know a client pays suppliers in a monthly run, time the heads-up so your invoice is in front of them before that run, not after it. For a large invoice, a phone call at the follow-up stage is often worth more than another email.
You don’t have to send any of this by hand. Xero’s invoice reminders can email customers up to five times, before or after the due date, using wording you write yourself. QuickBooks Online supports up to three automatic reminders, again before or after the due date. Paste in the templates below, set the timing once, and every invoice you send follows the same schedule.
If you bill from MinuteDock, your invoices reach Xero, QuickBooks and the other accounting integrations as drafts built from your tracked time. Once you approve and send an invoice there, your reminder schedule picks it up like any other. Reminders and reconciliation stay in the accounting software, which is where our invoicing workflow for accountants keeps them.
Five payment reminder email templates
Keep each message short enough to read in ten seconds. Attach a fresh copy of the invoice, or the invoice link, every time, so nobody has to dig through an inbox to find it.
1. The invoice email (when you send the invoice)
Make the amount, due date and payment details impossible to miss, and invite questions while there’s still time to sort them out before the due date.
Subject: Invoice [#1024] from [Your Practice] - due [15 July]
Hi [Name],
Thanks for working with us this month. Please find attached invoice [#1024] for [$1,200], due on [15 July].
You can pay via [bank transfer / card / payment link], and full details are on the invoice. If anything looks off or you have a question, just reply here and I’ll sort it out.
Thanks again, [Your name]
2. The heads-up (about 3 days before the due date)
This one catches an invoice before it slips, while it can still make the next payment run. It’s a courtesy, so keep it light.
Subject: Invoice [#1024] due on [15 July]
Hi [Name],
A quick note that invoice [#1024] for [$1,200] is due this [Friday, 15 July]. I’ve attached it again in case it’s handy.
If it’s already scheduled, thank you.
Cheers, [Your name]
3. The friendly nudge (3 to 7 days overdue)
Give the client the benefit of the doubt. An invoice can be missed for innocent reasons: it landed in a busy week, went to the wrong inbox, or is sitting in someone’s approval queue.
Subject: Quick reminder - invoice [#1024] now due
Hi [Name],
Just a friendly reminder that invoice [#1024] for [$1,200] was due on [15 July] and looks to be outstanding. I’ve reattached it here for convenience.
If it’s already on its way, please ignore this. Otherwise, you can pay via [payment method], and I’m happy to help if you need anything.
Cheers, [Your name]
4. The firm follow-up (about 14 days overdue)
Ask for a specific date. Stay courteous, but make the overdue status unambiguous: you’re stating facts, not assigning blame.
Subject: Overdue: invoice [#1024], payment needed
Hi [Name],
I wanted to follow up on invoice [#1024] for [$1,200], which is now [14 days] overdue. I haven’t yet received payment, so I’d appreciate it being settled by [new date].
If there’s a hold-up on your end or you need to arrange a payment plan, let me know and we can find a way forward. The invoice is attached again here.
Thanks, [Your name]
5. The final notice (about 30 days overdue)
Name the next step, whether that’s a late fee, paused work or a phone call, and only name one you’re prepared to follow through on. Referring to the terms the client agreed to keeps it about the arrangement, not the person.
Subject: Final reminder - invoice [#1024] overdue
Hi [Name],
Invoice [#1024] for [$1,200] is now [30 days] overdue, and I haven’t had a reply to my earlier reminders. As set out in our engagement terms, a late fee of [amount] will apply, and I’ll need to pause further work until the account is settled.
I’d much rather resolve this quickly and keep things on track. Please arrange payment by [date], or reply so we can talk it through. I’ll give you a call [tomorrow] to follow up.
Regards, [Your name]
When the client gives you a reason
A reply with an excuse is progress: you now know what’s in the way. Most fall into a few familiar patterns, and each has a calm answer that keeps the invoice moving.
“We never received it”
Take it at face value and remove the obstacle. Resend the invoice straight away, confirm the address it should go to, and ask whether it needs a purchase order number or a particular person’s approval. Then agree a payment date.
No problem at all, I’ve attached it again here. Is this the best address for invoices, or should I send them to someone in your accounts team? Could you let me know when it’s likely to be paid?
“We’re waiting to be paid ourselves”
This is often true, and it’s still not your problem to carry indefinitely. Acknowledge it, then ask for a firm date or offer to split the balance.
Thanks for letting me know, I understand how that goes. Could we agree a date for payment, or would it help to pay half now and the rest by [date]?
“We can’t pay it all right now”
A payment plan is usually better than a stalled invoice. Offer one with specific amounts and dates, confirm it in writing, and keep the reminders running against the new dates rather than the old one.
“These hours look higher than we expected”
This one needs facts. Send a breakdown of the work behind the charge: dates, who did what, and how long each piece took. If the client only questions part of the invoice, ask them to pay the rest while you resolve the disputed amount. A consultant who can show the extra workshops a client asked for, or a bookkeeper who can show the hours spent untangling a messy bank feed, usually settles the question in one email. Our guide to invoicing for hours worked covers how much detail to include so the question comes up less often.
When email isn’t enough
If the final notice gets no reply, another email is unlikely to change anything. Work through these steps in roughly this order, starting with the least formal.
Pick up the phone
An invoice may have been routed to the wrong person or lost between inboxes, and a two-minute conversation often surfaces the real reason faster than another email thread. Keep it simple:
Hi [Name], it’s [Your name] from [Your Practice]. I’m calling about invoice [#1024] for [$1,200], which was due on [15 July]. Is there anything holding it up on your side? When can we expect payment?
If the call confirms a genuine refusal rather than an oversight, at least you know where you stand.
Late fees and interest
Check what your terms allow before you add a fee or interest. The rules also differ by country:
- In the UK, a business can claim statutory interest on a late business-to-business payment at 8% plus the Bank of England base rate, unless the contract sets a different rate. It can also claim a fixed amount for debt recovery costs: £40 for a debt under £1,000, £70 up to £9,999.99 and £100 above that.
- In Australia, business.gov.au’s letter of demand guidance says to include late payment interest only if it was specified in the contract.
- In both Australia and New Zealand, the safe approach is to write any late fee or interest rate into your terms before the work starts.
Pause work, and carry less risk next time
Pausing work until the account is current is a reasonable step, especially on a larger engagement where you’d otherwise keep adding to the balance. For longer projects, working to milestones or taking a deposit limits how much unpaid work you ever carry. For ongoing work, a monthly retainer invoiced at the start of each month keeps the balance from building up behind the work.
The last resort
When an invoice drags on despite every reasonable effort, a letter of demand, a debt collector or a small claims process are the remaining options. They’re rarely worth the time and goodwill for a single overdue bill, but they exist. Your strongest position in any dispute is a clean paper trail: signed terms, a record of the work you did and when, and the history of your reminders. That record starts long before anything goes wrong, with time tracking your team actually keeps up.
