Yes, but not one invoice per visit if you can help it. Most of what an invoice costs you is admin time, which is the same for a £60 test as a £1,400 remedial, so small invoices can cost more to raise and chase than they're worth. Batch regular visits onto one invoice per customer, collect it by direct debit or take payment before the engineer leaves, and let software do the chasing.
In this article
The short version
- Raising, sending, matching and chasing an invoice takes the same office time whatever its value, so small jobs carry a far higher share of cost.
- On the article's assumptions, billing 12 monthly PPM visits separately costs £70.08, against £12.90 for one invoice with 12 lines.
- At a 5% ceiling on collection cost, the smallest job worth invoicing on its own is about £117, so set a minimum charge or batch below that.
- Put the site, date, engineer and job number on every batched line, and agree that undisputed lines are paid on the due date.
- Collect batched invoices by direct debit under one mandate, and take payment by link before the engineer leaves on one-off jobs.
What a small invoice costs you
Every invoice needs someone to find the job sheet, check it against the contract, raise the invoice, send it, match the payment when it arrives and, for some of them, chase. None of that shrinks when the invoice does.
Take a customer with 12 sites, each getting a monthly PPM visit at £114 including VAT. Assume office time costs £18 an hour, an invoice takes 10 minutes to raise, send and reconcile, one in three needs chasing at 15 minutes each, and the payment fee is 1% + 20p with the percentage capped at £4 (Adfin's published price for direct debit and bank payments). Swap in your own figures.
| 12 separate invoices | 1 monthly invoice with 12 lines | |
|---|---|---|
| Staff time | 180 minutes, £54.00 | 29 minutes, £8.70 |
| Payment fees | 12 × £1.34 = £16.08 | £4.20 |
| Total cost | £70.08 | £12.90 |
| Share of £1,368 billed | 5.1% | 0.9% |
A single £114 visit costs about £5.84 to bill and collect on its own. On a £60 test, the same admin time takes that to nearly 9% of the invoice. The same sum gives you a floor for pricing: if you're only prepared to spend 5% of an invoice's value on getting paid, the smallest job worth invoicing by itself on these numbers is about £117. Below that, set a minimum charge, fold the work into a contract price, or batch it.
How to batch visits without inviting disputes
Batching suits contract customers with regular visits or several sites. For a customer you see once a year, a single invoice per visit is still simplest. If waiting until month end worries you, close the batch weekly or fortnightly and keep most of the saving.
The risk with a batched invoice is that one queried line holds up the other eleven. Most queries can be headed off on the invoice itself:
- Put the site, visit date, engineer and job number on every line.
- Attach the job sheets or service certificates in the same order as the lines.
- Quote the customer's purchase order, or one per site if that's how their accounts team works.
- Agree in the contract that undisputed lines are paid on the due date and a disputed line is dealt with separately.
Ask the customer's accounts team how they want the invoice laid out before you switch, and tell your engineers that job sheets need closing promptly. Each month, check the number of visits scheduled against the number of lines on the invoice, because a visit whose job sheet was never closed can drop out of a batch without anyone noticing.
How to get paid without an invoice to chase
A monthly batch changes in value from month to month, and that's fine for direct debit. One mandate can collect a different amount each month without the customer signing again, as long as you give notice of the amount and date first, and the invoice can be the notice. That leaves one invoice, one collection capped at £4.20 in fees, and nothing to chase unless the collection fails.
For one-off jobs that don't fit a batch, such as a call-out for a new customer or a single extinguisher service, take payment before the engineer leaves. A payment link sent by text or email at the end of the job lets the customer pay by card, Apple Pay, Google Pay or pay by bank there and then, and the invoice goes out already marked paid. Card fees have no cap, so on bigger one-off jobs put pay by bank first. For business customers, Adfin can add the card fee to the payment so the customer covers it.
How to take the chasing off your desk
Some small invoices will still go unpaid, and nobody wants to spend 15 minutes chasing £60. Adfin chases every overdue invoice over email, SMS or WhatsApp on the schedule you set, sent from your own email domain, so the small ones get the same follow-up as the large ones without anyone picking up the phone. Its AI agents can adjust timing and channel for each customer, send a statement when someone goes quiet and add statutory interest and fixed compensation automatically to late business invoices, all within rules you approve. A late fee that turns up every time, on a £60 invoice as much as a £6,000 one, gives slow payers a reason to stop leaving you until last.
Common questions
How much does it cost to raise and collect a small invoice? There's no published UK benchmark, so work it out from your own admin minutes, staff cost, payment fee and chasing time. On the assumptions above, a £114 invoice costs about £5.84.
Should I invoice every PPM visit separately? Not if the same customer has regular visits. One monthly invoice cuts the repeated admin, and one payment carries one fee.
Won't a batched invoice take longer to get paid? The first month's money arrives a little later. After that, a month's money comes in each month as before, and closing batches weekly or fortnightly shortens the wait.
What happens if the customer disputes one visit on a monthly invoice? Agree in the contract that undisputed lines are paid on time and the disputed line is handled separately.
Can I collect a different amount by direct debit each month? Yes. One mandate covers varying amounts, with advance notice of each amount and date, which the invoice can give.
Is it worth taking card payment on site for small jobs? For one-off jobs with new customers, often yes, since there's no invoice left to chase. On larger jobs a pay-by-bank link usually costs you less.
Sources
- Bacs - Direct Debit: an introduction to the service (accurate as of September 2026) https://www.bacs.co.uk/media/pu4bmlzs/dd_introduction.pdf
- GOV.UK - Late commercial payments: charging interest on commercial debt (accurate as of September 2026) https://www.gov.uk/late-commercial-payments-interest-debt-recovery/charging-interest-commercial-debt
- Adfin - Pricing (accurate as of September 2026) https://www.adfin.com/pricing
- Adfin - Credit control (accurate as of September 2026) https://www.adfin.com/credit-control
