About
One developer.
One product.
Built for UK trades.
Honest Invoices is built and run by Vix Hawley, founder of Airtisan. No VC, no offshore call centres, no enterprise sales team. Just one person reading the HMRC spec cover-to-cover so you don’t have to.
From the founder
Why I built this.
I’m Vix Hawley — software engineer, founder of Airtisan, and the only person who works on Honest Invoices. I built this because a friend’s dad — a plumber — was paying £35/month for accounting software he didn’t understand, didn’t use, and didn’t know was about to be made “wrong” by Making Tax Digital. He’d never heard of MTD.
The first MTD ITSA quarterly deadline is 7 August 2026. From April 2027 it covers sole traders earning over £30,000. From April 2028, over £20,000 — which is most of the trades. The big accounting platforms were designed for accountants, not for someone covered in dust at 5pm who just wants to send an invoice and go home.
So I built the integration myself, end-to-end. OAuth flow, fraud-prevention headers, sandbox testing, the full Self-Employment Business and BSAS APIs. It took months. The HMRC sandbox barely documents what it expects; the support channel is a form and a three-day wait. I’ve sat with the same error messages other small developers are sitting with right now.
I’m telling you this because the “HMRC-recognised” tick on a competitor’s homepage doesn’t tell you anything about whether they’ve done the work. We have. I can show our working — the journey logs, the correlation IDs, the proof.
£15/month. Locked. No price hikes, ever. Built by someone who knows what it took to build it — and who isn’t going to make you pay for that complexity.
— Vix · founder@honestinvoices.com
What we believe
The four things we won’t do.
No price hikes, ever
Your £15/month is locked the day you sign up. It’s the price you’ll be paying in three years. It’s written into our terms, not just a marketing line.
No selling your data
You pay £15/month. We make software. That’s the deal. No ad networks, no data resale, no surveillance baked in.
No support tickets
Email goes straight to the founder. No queues, no offshore call centres, no "I’ll escalate that to my team lead". You’ll reach the person who can fix it.
No bloat
Invoicing, MTD ITSA, time tracking, materials. That’s the scope. We’re not bolting on payroll, CRM, or "multi-entity reporting" so we can charge more next year.
The work
Verifiable, not vibes.
The HMRC MTD ITSA integration was built by hand against HMRC’s sandbox. Every API, every fraud-prevention header, every OAuth flow.
The full sandbox journey runs 16 of 16 steps clean — from seeding a test business, through four cumulative quarterly submissions, the annual submission, BSAS retrieve/adjust/list, tax calculation trigger, retrieve, and the final declaration. The proof is on file.
When we’re on the HMRC Software Choices list, you’ll know we earned it — not because the homepage has a logo, but because the journey logs are reproducible.
HMRC sandbox journey
Ready to try it?
14 days free. £15/month after that, locked. No card required.