Contact

Email: contact@soletradersums.co.uk. Every message is read by a person.

A figure looks wrong

Send the page address, what you typed and the GOV.UK or HMRC page that gives another figure. Mid-year changes do happen: in 2026 the simplified mileage rate moved to 55p for the first 10,000 miles and HMRC corrected its Making Tax Digital penalty table after publishing it. A correction goes live with the date of the new reading.

We cannot look at your tax affairs

Please do not send your UTR, National Insurance number or tax return. We cannot advise on a personal case, contact HMRC for you or tell you whether a contract is inside IR35. For that, the place to go is HMRC's helplines, a chartered tax adviser or, if your income is low, the charity TaxAid.

A calculator for your own website

Business support services, co-working spaces and freelance newsletters can show the self-employed tax calculator in an iframe at no cost: the code is on the embed page.

Publisher

Radif Partners
49 rue du Ressort
63000 Clermont-Ferrand, France
contact@soletradersums.co.uk

Updated: 2026-10-15.