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UK Self Assessment Tax Calculator | Sole Trader, Freelancer HMRC Estimator (Offline HTML App)

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Highlights

  • Designed by PlannerToolLab
  • Party decor for gatherings and celebrations
  • Digital download
  • Digital file type(s): 1 ZIP

KNOW YOUR UK TAX BILL IN MINUTES — NO EXCEL, NO SPREADSHEET SKILLS NEEDED

Stop guessing what you'll owe HMRC. This offline HTML app calculates your estimated Income Tax, National Insurance, dividend tax and student loan repayments — and shows you exactly which box each figure goes in when you file.
Built for UK sole traders, freelancers, and side-hustlers who want the clarity of a professional tax tool without the hassle of Excel licences, Google account sign-ups, or monthly software subscriptions.

WHAT MAKES THIS DIFFERENT

• Opens in any browser — no Excel, no Google Sheets account required
• Fully offline — your financial data never leaves your device
• One-time purchase — no subscription, ever
• See every calculation band by band — nothing hidden inside a locked formula
• Every figure mapped to its SA100 / SA103 tax return box

KEY FEATURES

• Automatic Income Tax calculation across basic, higher and additional rate bands
• Class 4 and Class 2 National Insurance calculated automatically
• Dividend tax and savings interest tax, with allowances applied correctly
• Student / postgraduate loan repayment calculator (Plans 1, 2, 4, 5 & Postgraduate)
• Automatic Payments on Account warning — know in advance if HMRC will ask for advance payments
• Itemised expense tracker with automatic deductible / non-deductible flagging
• Editable rates so the tool stays accurate for future tax years
• 8 colour themes, sample data mode, and full backup/restore
WHAT YOU'LL RECEIVE
• 1 offline HTML app file (UK_Self_Assessment_Tax_Estimator.html)
• 14-page PDF user guide
• 1-page Quick Start Card
• Personal use licence

IMPORTANT

This tool provides a working estimate based on standard UK tax rules and is not a substitute for professional advice or HMRC's own calculations. Please see the full disclaimer in the listing and included guide.


FAQ

Is this the same as filing my tax return?
No — this is a private planning and estimation tool. You'll still file your actual return through HMRC or your accountant. This app tells you what to expect and exactly which box each figure belongs in.
Does this work on Mac and Windows?
Yes. It's a single HTML file that opens in any modern browser (Chrome, Safari, Edge, Firefox) on Mac, Windows, iPad, Android, or Chromebook. No installation required.
Do I need an internet connection?
No. Once downloaded, the app works completely offline. Nothing you type is ever uploaded anywhere.
Is this suitable for Scottish taxpayers?
This tool uses standard rest-of-UK tax bands. Scotland has different Income Tax bands, so Scottish taxpayers should use this as a rough guide only — see the built-in Help tab for details.
What if I need it for next tax year?
Go to Settings and update the Personal Allowance and rate thresholds once HMRC confirms the new year's figures. Full guidance is in the included PDF guide.
Is my data private?
Completely. Everything is stored only in your browser's local storage on your own device. There's no account, server, or cloud sync involved.
Can I get a refund?
As this is an instant digital download, we're unable to offer refunds once files have been delivered — please review the listing carefully before purchasing, and message us first if you have any questions.

Instant Download

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Instant download items don’t accept returns, exchanges or cancellations. Please contact the seller about any problems with your order.

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PlannerToolLab
Planner Tool Lab
PlannerToolLab ·

London, United Kingdom

We calculate this number using a recency-weighted average of all ratings, with a rating's value decreasing by half each year to best reflect the current experience. 5.0
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62 sales
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3 years on Etsy
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Listed on Jul 3, 2026
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