The IR35 Hub is live · the firm opens in stages
Every figure, with its working. The tax rules work it out, and the AI explains it in plain English.
Free: 10 questions, no card, no login.
Said up front: Nebula Finance runs on AI and is not authorised or regulated by the FCA, so it gives no regulated advice. Our limits
Corporation Tax · year to 31 March 2026
£92,000 × 25% = £23,000.00CTA 2010 s.3(£250,000 − £92,000) × 3/200 = £2,370.00CTA 2010 s.18B£23,000.00 − £2,370.00 = £20,630.00The day after 9 months from 31 March 2026: 1 January 2027TMA 1970 s.59DExample, not your figures: one company with no associated companies, a 12-month period, and no other income.
An example from the app · every figure from the rules · every rule cited
Learn it in a minute
Four things UK companies often get wrong, for contractors, startups and growing businesses. Make your guess, and the firm's engine answers line by line, with the law behind every line.
The lessons work out every figure in your browser, so they need JavaScript.
The lessons are resting while the firm re-checks its rules table.
Worked by the firm's engine under UK rules for the 2026 to 2027 tax year, from its rules table, reviewed until 31 October 2026. Illustrations, not advice. Nebula Finance runs on AI and is not authorised or regulated by the FCA.
Try it now
Drop in a bank statement saved as a CSV. Every line is read in seconds, and a line that can't be read is left out and counted, never treated as nothing.
Date, description and amount columns work best.Use our sample, or choose a CSV from your phone.
Sums of your own lines, read in this browser. Dates are read the UK way, day first.
How it works
Scroll through what the firm will do with your books once it opens, from the first read to the last signature. The AI writes the words; the tax rules write every number; a named accountant signs.
01 · The first read
Five lights, each lit by a fact and never by a timer.
02 · Evidence
Two facts in agreement pull together. One fact alone gets a question, never a match.
Bank line
Receipt you photographed
03 · The difference
Every figure in an AI draft is checked against what the tax rules produced. Anything else is removed before you read it.
Checked against the rules before anyone reads it.
04 · Signed and early
Once the firm opens, nothing leaves without a signature, and every deadline shows the clear air left before it.
Open now
Answer 10 questions and see whether you're inside or outside IR35, with the reason for each factor. It's free, with no account.
A verdict, how sure it is, and the five factors by name. No card, no login.
Your contract read clause by clause, every factor scored, and a dated PDF with a declaration you sign yourself.
Where we are
Two parts are open today. The rest is built and being tested, and sending returns to HMRC waits on HMRC recognising our software.
Built so far, as at October 2026: 102 screens, 21 specialist desks and 401 test files behind them.
The product tour: a short film for each kind of business, then a walk through the screens.
Take the tour → LivePut in your day rate and see what you would keep through a limited company.
Work it out → GuidesIR35, dividends, what to set aside and when it is due, in plain English.
Read the guides → FilmWhat is safe to take, a loan warning that stays, and every date ahead.
Watch it → FilmPayroll that knows each person, VAT on evidence, and a month that adds up.
Watch it → FilmAn R&D claim from evidence, SEIS and EIS in order, and runway in three cases.
Watch it → FilmEvery client’s drafts in due-date order, under your own name.
Watch it →Who's behind it
The people
People who build financial software, working with qualified accountants who know UK tax. The IR35 letter that started it.
The limits
Insurance and protection go to Broadbench, an FCA-regulated partner. We don't give advice we aren't authorised to give.
Your money
Bank feeds, when they open, come through an FCA-authorised provider, read-only, so no one here can move your money. Nothing is filed or paid without your approval.
For accountants and bookkeepers
We are not trying to take your clients off you. The engine does the arithmetic and shows its workings; the judgment, the sign-off and the relationship stay with a qualified human.
If you already have one
Every figure arrives with the rule it came from and the arithmetic behind it, so your accountant can check it in minutes rather than rebuild it. Nothing is filed or paid without a human approving it first.
If you are a practice
The same engine, under your own name, doing the compute-heavy work your juniors do now. It is not open yet, but we would rather design it with practices than at them.
See the practice preview →The waitlist
First access as each part opens, at a launch price we intend to set below a typical contractor accountant’s monthly fee. We’ll publish it in full, VAT included, before you pay anything.
You're on the list
One email when a part opens, and nothing else. Your address is held by HubSpot, our email provider, and every email has an unsubscribe link. Privacy Policy.