Sole Sums

Terms of use

Short and plain. By using Sole Sums, the app or this website, you agree to these terms.

Last updated 3 November 2026.

Who we are

Sole Sums is run by Dylan Powell, trading as Sole Sums, South Wales, UK. Contact: dylan@dragondevelopment.co.uk.

Estimates only

Sole Sums gives estimates based on the figures you enter and on published GOV.UK rates. It is not financial, tax or legal advice. It does not cover every situation. For example, it does not include dividends, savings interest over your allowance, property income, capital gains, pension tax relief or the High Income Child Benefit Charge.

Your actual tax is worked out by HMRC from your tax return. Always check your HMRC calculation before you pay. If you are unsure, speak to a qualified accountant or tax adviser.

Filing is your responsibility

Sole Sums does not file tax returns or send anything to HMRC. You are responsible for the figures you submit, for filing on time and for paying on time. We are not liable for any decision you make about your tax return, payments, penalties or interest based on the app, to the extent the law allows.

Accuracy of rates

We check the rates against GOV.UK and show the date of the last check. Rates can change, and mistakes can happen. If you spot one, please tell us and we will fix it.

Sole Sums Pro

  • Pro is a one-off in-app purchase (£4.99 at launch) on iOS and Android. It is not a subscription.
  • The purchase is handled by Apple or Google under their terms.
  • Refunds are handled by Apple or Google. Request one through the App Store or Google Play.
  • You can restore Pro on a new device signed in to the same Apple or Google account, using "Restore purchases" in the app.
  • Pro on the web app is not available yet.

Your data

Your records are stored on your device. Keep your own backups, for example with Pro's CSV export. We cannot recover data that was deleted or lost with a device. See the privacy policy.

Using the app fairly

Please do not try to copy, resell or reverse-engineer the app, or use it for anything unlawful.

Your consumer rights

Nothing in these terms affects your statutory rights as a consumer in the UK.

Law

These terms are governed by the law of England and Wales.

Changes

We may update these terms. The date at the top shows the latest version.