For UK plumbers
Built for plumbers. Compliant invoices in 30 seconds.
Voice-to-invoice for UK sole-trader plumbers. Talk through the boiler service, the burst pipe, the bathroom refit — Honest Invoices builds the invoice, splits CIS labour and materials, and keeps your records in MTD-ready shape.
What you say
“Boiler service at 14 Acacia Road — full strip and clean, replaced the expansion vessel, no warning notice. Ninety minutes on site. Ninety quid for labour, forty-two for the vessel.”
What Honest Invoices does in 30 seconds
- · Extracts time, materials and costs from the words you used
- · Builds a compliant UK invoice with sequential numbering, VAT (if registered), and your payment terms
- · Stores the digital record for MTD ITSA quarterly submission
- · Emails the PDF to your client when you tap send
£15/month, locked · 14-day free trial · no card required
The reality
The pain you actually have.
Generic accounting software is built for accountants. This is built for a plumber who finishes a job at 5pm covered in dust and just wants to get paid.
01
Boiler services and emergency callouts get invoiced in the van or never. By 8pm at home, the day is gone and the paperwork starts piling up.
02
CIS deductions get taken at 20% off your commercial work, but most jobbing plumbers have no clean running total of what they're owed back at year-end.
03
MTD ITSA starts at £50k from April 2026, then drops to £30k in 2027 and £20k in 2028 — that's most full-time plumbers within two years.
What it does
Three things. Built for trades.
No bloat, no “multi-entity reporting”.
Voice-to-invoice that speaks plumber
Describe a boiler service, a tap swap, a soil-pipe replacement, a bathroom refit, in the words you actually use on the phone to the customer. The AI extracts the time, the parts, the customer name, and builds a UK-compliant invoice with sequential numbering, your business details, and your payment terms.
No typing on a tiny phone keyboard between jobs. No remembering what you did Monday on Friday.
CIS labour-and-materials split, automatic
When you're sub-contracting on commercial sites under CIS, every invoice needs labour and materials shown separately — otherwise the contractor deducts CIS on the whole lot, including the £600 you spent at Plumb Center.
Honest Invoices splits labour and materials on every line, calculates your CIS deduction at 20% or 30%, and keeps a running total of deductions across the tax year so your year-end reclaim is a one-line figure, not a shoebox of statements.
MTD-ready records, built end-to-end against HMRC
Every invoice you record is a digital record in the format HMRC's MTD ITSA APIs want. Quarterly updates, BSAS, and the final declaration are all built and tested 16/16 in HMRC's sandbox — they go live to users the moment our production credentials come through.
The first quarterly deadline is 7 August 2026. If you earned over £50k last tax year, you're in scope now — starting digital records today is the prep work that matters.
From the founder
Built end-to-end against HMRC’s APIs.
Honest Invoices is built and run by Vix Hawley. The MTD ITSA integration was built by hand — OAuth, fraud-prevention headers, the full Self-Employment Business and BSAS APIs. It took months. The full HMRC sandbox journey passes 16 out of 16 steps with proof on file.
Most accounting platforms are built for accountants. This one is built for plumberswho don’t want to spend their evenings doing admin. £15/month. Locked. No price hikes, ever.
FAQ
FAQ for plumbers.
Do you generate gas safety certificates / CP12s?
CP12 landlord gas safety records are in active build. The schema, renewal reminders, and signature flow are in place; the wizard and PDF are next. If you do landlord rounds, that’s where the time savings live — and it’s coming.
Until then, your invoices can reference the CP12 number, the property address, and the date so your invoice trail and your cert trail line up at year-end.
What about CIS deductions on commercial sub-work?
Every invoice tagged as CIS work splits labour and materials, calculates the 20% (or 30% if unregistered) deduction at source, and contributes to a year-end running total. Your CIS reclaim figure is ready when you sit down to do your Self Assessment — no PDS hunt, no spreadsheet.
More on the underlying rules: CIS deductions explained and how to reclaim CIS as a sole trader.
I'm a sole-trader plumber earning £55k. Am I in scope for MTD ITSA?
Yes — from 6 April 2026. The first quarter ran from 6 April to 5 July 2026, with a submission deadline of 7 August 2026. You've got three more quarters to file through HMRC-approved software, plus an annual submission and a final declaration.
Honest Invoices keeps your records in the right shape today and will submit directly through HMRC's APIs the moment our production credentials land. You have until 7 August.
Will my price go up in two years?
No. £15/month is the price the day you sign up, and the price you'll be paying in three years. If we launch a higher tier in future, you stay on £15 — locked, in the terms, not just a promise.
We've watched accounting software prices triple over five years. We're not doing that to you.
I do mostly cash-in-hand domestic work. Is this still useful?
Yes — but with a caveat. If your turnover is below £20k a year, MTD ITSA doesn't apply to you yet (April 2028 threshold). Honest Invoices is still useful for chasing payment and keeping records clean. Once you're over £20k it becomes mandatory.
Can I keep using my own bank, accountant, and Gas Safe paperwork?
Yes. Honest Invoices is invoicing + (soon) gas safety records. You keep your existing bank account, your existing accountant (we export CSV for them), and any existing certification tools. We don't try to be everything — we try to be the best at the bits we do.
Talk to a person
Not a chatbot.
If you’ve got a question about whether Honest Invoices fits your trade — call, text, or email. You’ll reach the founder, not a queue.
Ready to stop typing invoices?
14 days free. No card required. £15/month after that — locked, forever.