Free tools
Tools you can use
without talking to anyone
Seven free tools that run entirely in your browser. Nothing you type is sent anywhere, there is no sign-up, and none of them asks for an email address before giving you the answer.
Corporation tax calculator
UK corporation tax including marginal relief, plus the number other calculators leave out: the rate on your next pound of profit, which is 26.5% between £50,000 and £250,000 rather than the 25% headline.
Work out the rateDividend tax calculator
UK dividend tax at the 2026/27 rates, which changed in April to 10.75%, 35.75% and 39.35%. Enter your salary too, because dividends are taxed on top of it, and see the band between £100,000 and £125,140 where the next pound costs 58.25p.
Work out the taxPayPal fee calculator
What a PayPal payment costs in the UK, and what to charge so the amount you wanted is the amount that lands. Including the line every other calculator leaves out: the 3% currency conversion margin, taken inside the exchange rate rather than charged as a fee.
Work out the feeSIC code lookup
All 731 Companies House SIC codes, searchable by number or by what the business does. Plus the column no other SIC list has: the merchant category code an acquirer is likely to assign you, which is the one that decides your card pricing.
Find your codeMCC code lookup
Search all 973 merchant category codes by number or by what the business does, or download the whole list as a spreadsheet. Plus what your MCC changes about pricing, acceptance and declines.
Look up a codeLate payment interest calculator
What you can legally add to an overdue B2B invoice: statutory interest at 8% plus the Bank of England base rate, and the fixed compensation of £40, £70 or £100 by debt size.
Work out what you are owedLate payment letter generator
Fill in the details, pick the escalation stage from polite reminder to letter before action, and download a properly formatted letter as a Word document.
Generate a letterAll seven run client-side against data committed to this site. No API, no network call, nothing typed leaves your device.
Reference guides
Not tools, and worth separating: these are guides you read rather than things you operate. They live in payments explained with the rest of the library.
UK payment rails compared
CHAPS, Bacs and Faster Payments on speed, cost and value limits.
Faster Payments limits
The £1m scheme ceiling, and why your bank’s limit is lower.
What card processing costs
Every fee category named, from interchange to reserves.
Late payment letter templates
The four letters, and when to send each one.
Check if we can help
Tell us what you need. You’ll deal with one team, with the group’s licensed institutions behind it, and get a straight answer either way.