Self Employed Tax Tracker App UK, Sole Trader Self Assessment, Income Expense Mileage

UK SELF-EMPLOYED TAX TRACKER APP: log your income, expenses and mileage as you go, and always know how much to set aside for your tax bill. Built for UK sole traders and Self Assessment, including Scottish tax rates. Works offline in your web browser, with no subscription and no account.

TRY IT FIRST: see a free demo with sample data at originaldigistudio-apps.pages.dev (works on iPhone too)

No more shoebox of receipts and a panic in January. Add a sale or an expense in seconds, pick the HMRC category, and the app works out your profit, Income Tax and Class 4 National Insurance as you go.

WHAT IT DOES
- Tax to set aside: a live estimate of Income Tax and Class 4 NI on your profit
- England, Wales and NI rates, or Scottish rates, for 2025/26 and 2026/27
- Expenses sorted into the HMRC categories used on the self-employment pages (SA103)
- Mileage log at 45p a mile for the first 10,000 miles, then 25p, worked out for you
- Working from home: HMRC's flat rate, month by month
- £1,000 trading allowance check: tells you if it saves more than claiming expenses
- Other income, such as a PAYE job, so your estimate uses the right tax band
- Quarterly totals for Making Tax Digital, using the official 6 April quarters
- Self Assessment summary with your turnover, expenses by category and net profit
- Payment on account estimate and a countdown to 31 January
- Receipt tick box, CSV export, dark mode, printing, and backup and restore

WHY PEOPLE LIKE IT
- Simple: no accounting jargon, just income, expenses and what to set aside
- Made for the UK, including Scotland, in pounds
- Private: everything is saved on your own device and nothing is uploaded
- Pay once and keep it. No monthly fees like bookkeeping software

WORKS ON
Any computer (Windows, Mac or Chromebook) and Android phones, in Chrome, Edge, Firefox or Safari. On iPhone and iPad, Apple's Files app can preview the file but may not save your changes, so we recommend a computer or Android device.

WHAT YOU GET
- Self-Employed Tax Tracker App (one HTML file in a zip)
- Start Here guide (PDF) with step-by-step setup

HOW IT WORKS
Instant digital download. After you pay, find the zip in your Etsy purchases, unzip it and open the app in your browser.

GOOD TO KNOW
- Digital download only. Nothing is posted to you.
- Tax figures are estimates for sole traders. It's a record-keeping tool, not tax advice, and it doesn't file your return for you. Check GOV.UK or an accountant if you're unsure.
- It doesn't include student loan repayments, Class 2 contributions or other reliefs.
- Your data is saved in your browser. Clearing your browsing data can delete it, so use the built-in backup now and then.
- The app was created with the help of AI tools and finished and checked by the shop.
- For personal use only. Please do not resell or share the file.

Questions? Message me any time.