About Indietax

Indietax is a free collection of UK tax calculators built for freelancers, contractors, sole traders, and anyone navigating self-employment. No signups, no paywalls, no data collection — just fast, accurate answers to the tax questions that come up every year.

Who it’s for

If you’re self-employed in the UK — whether you’re a full-time contractor, running a side hustle alongside your day job, a landlord with rental income, or a small business owner trying to understand your tax position before speaking to an accountant — Indietax is built for you.

The tools cover everything from your Self Assessment estimate and Class 4 National Insurance, to more specific calculations like the Flat Rate VAT Scheme, CIS deductions, IR35 comparisons, and working-from-home deductions. Every calculator is reviewed and updated each April so the numbers always reflect the current tax year.

Why it exists

Self-employed people in the UK face a genuinely complicated tax system — one that was designed primarily around employment, not around the reality of running your own income. Every January, millions of people scramble to estimate what they owe, often juggling multiple income streams, allowable expenses, and payment-on-account calculations across five browser tabs.

The tools that already exist tend to fall into two camps: HMRC’s own guidance, which is accurate but dense and hard to navigate; and third-party calculators, which are often out of date, buried in lead-generation funnels, or require you to hand over an email address before they’ll show you a number.

Indietax was built to fill the gap in the middle: tools that are fast, honest, mobile-friendly, and completely free to use — without asking for anything in return. If you earn money for yourself, you deserve to understand your tax position clearly, at any point in the year, without friction.

What makes it different

• No account required. Every calculator works the moment you land on the page. No email address, no registration, no cookie wall before the result appears.
• Updated every tax year.Rates, thresholds, and rules are reviewed in April each year to reflect HMRC’s latest changes. The tools are currently correct for the 2026/27 tax year (6 April 2026 to 5 April 2027).
• Built for phones. More than half of people searching for tax help are on mobile. Every calculator is designed to work on a small screen — no horizontal scrolling, no tiny inputs, no tables that fall off the edge.
• Honest about what it can’t do. These are estimates based on published HMRC rates. Every tool tells you exactly what it includes, what it leaves out, and when you should talk to a qualified accountant instead of relying on an estimate.
• Works offline.Once loaded, every calculator continues to work without an internet connection — useful when you’re doing your accounts somewhere without reliable signal, or in a client meeting.
• No data leaves your device. All calculations run entirely in your browser. The numbers you enter are never sent anywhere, stored anywhere, or linked to you in any way.

The tools

Indietax covers the calculations that come up most often for self-employed people in the UK:

• Income tax and National Insurance for sole traders
• Take-home pay for employees and contractors
• VAT — standard, reduced, and flat rate scheme
• Self Assessment estimates including payments on account
• IR35 inside vs outside comparisons
• Limited company vs sole trader after-tax income
• CIS deductions for subcontractors
• HMRC mileage allowance for business travel
• Pension contributions and tax relief
• Student loan repayments across all plans
• Trading allowance for side hustles and casual income
• Use of home as office — simplified and apportionment methods

New tools are added regularly. If there’s a calculation you need that isn’t covered, get in touch — requests from actual users are how the tool list grows.

Accuracy and disclaimer

Every calculator is based on published HMRC rates and legislation for the current tax year. Results are estimates — they are provided for information purposes only and do not constitute regulated financial or tax advice. Tax situations involving multiple income sources, foreign income, significant capital gains, or unusual reliefs may produce results that differ from what a qualified accountant would calculate.

Always verify figures that matter to you with a professional before filing or making payments to HMRC. See the full disclaimer and terms of use for more detail.

Get in touch

Found an error? Spotted a rate that’s out of date? Have a suggestion for a tool that’s missing? Every message gets read. hello@indietax.co.uk

Accuracy is the most important thing on this site. If something is wrong, please say so — it helps everyone who uses these tools.