Our Story

I built Numro because I needed it.

I moved from Nigeria to the UK as a tech professional. The work was familiar. The tax system was not. PAYE made sense; you got paid and the right amount went where it needed to go. But the moment you have any income that isn't a single payslip, a freelance contract, a dividend, a side project, a rental, UK tax becomes a participation sport. You're expected to know what Payment on Account is. You're expected to understand which expenses HMRC will accept and which it won't. You're expected to know whether Making Tax Digital applies to you and what "MTD-compatible software" actually means.

The information existed. Every rule, every threshold, every nuance was sitting on gov.uk, technically. But spread across hundreds of pages, written for inspectors and accountants, organised the way the law is organised rather than the way a person needs it.

The tools that claimed to help fell into two categories. HMRC's own calculator: accurate but shallow, calculates a number and walks away from any explanation. Paid tools like GoSimpleTax or TaxScouts: strong but priced and designed for people who already knew what they were doing.

I kept looking for the thing in between. The tool that calculated accurately and explained clearly. The tool that didn't assume I already understood Class 4 NI thresholds, but didn't pretend tax was simpler than it actually is. The tool that would tell me not just what I owed, but why.

I couldn't find it. So I built it.

Numro is the tool I wished existed when I first needed it. The tax engine handles the gnarly cases most calculators skip: the £100k personal allowance taper, Class 2 and Class 4 NI stacking, dividend band interaction, the 60% marginal trap, Gift Aid band extension, HICBC, capital gains within stacked bands. It cites HMRC guidance on every output. And when you have a question that isn't covered by a calculation, like "is this lunch allowable?" or "what counts as subsistence?" The AI assistant answers it precisely, grounded in HMRC's actual rules rather than vague paraphrases.

If you're a freelancer or contractor or sole trader trying to make sense of UK tax, Numro is for you. If you're an accountant looking for a tool to recommend to clients who don't need a full filing service but want to understand their position, Numro is for you too.

Ojonugwa