Free UK tax tools · Private · No sign-up
Understand your UK tax before the deadline arrives.
Use focused calculators for salary, self-employment, Self Assessment, dividends, rental income and modern online income — then use the linked guides and trackers to understand the figures behind the estimate.
Calculator inputs stay in your browser Assumptions linked to official guidance
Choose how you earn
Main UK tax calculators
Each route below has a functioning calculator and guidance written for a distinct tax question. Start with the income type that best matches your situation.
Salary & PAYE
Estimate Income Tax, National Insurance and take-home pay from employment income.
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Sole traders
Estimate tax and National Insurance from self-employed profit after business expenses.
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Self Assessment
Estimate a tax-return position, balancing payment and possible payments on account.
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Dividends
Estimate dividend tax alongside salary or other taxable income using current rates.
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Landlords
Estimate tax on rental profit using actual expenses or the property allowance.
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Resellers
Estimate tax on trading profit from Vinted, eBay, Depop and other marketplaces.
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Creators
Estimate tax on content, sponsorship, affiliate, membership and platform income.
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Side hustles
See how extra trading income can interact with PAYE income and the trading allowance.
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Digital products & SaaS
Estimate tax for courses, downloads, templates and self-employed digital businesses.
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Practical resources
Keep the records behind the calculation
Free trackers and checklists help turn an estimate into organised records you can reconcile against platform statements, receipts and tax-return figures.
Reseller Profit Tracker
Track stock, marketplace sales, fees, postage and item-level margin in one spreadsheet.
Sole Trader Tax Spreadsheet
Record business income, expenses, evidence and provisional profit throughout the year.
Self Assessment Checklist
Work through records, filing checks, deadlines and payment preparation before submitting.
Creator Income Tax Tracker
Separate platform payouts, sponsorships, affiliate income and creator-business costs.
Practical guidance
Guides built around real tax decisions
The guides explain records, allowances, expenses, reporting and common mistakes rather than repeating calculator descriptions.
What expenses can resellers claim?
A practical breakdown of stock, fees, postage, packaging, travel and other reseller costs.
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How to calculate tax as a sole trader
Work from gross income to taxable profit, Income Tax and National Insurance step by step.
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Payments on account explained for sole traders
Understand why January and July payments arise and how they relate to the previous bill.
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Landlord allowable expenses
Separate day-to-day property costs from capital spending and residential finance costs.
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Dividend tax guide UK
Understand the dividend allowance, tax bands and how dividends interact with other income.
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Do Twitch streamers pay tax in the UK?
A creator-focused guide to subscriptions, donations, sponsorships, records and expenses.
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How calculations are researched
UK Tax Toolbox checks calculator assumptions against public HMRC and GOV.UK material, states important exclusions and links users to the official guidance used for context.
About UK Tax Toolbox
The site is built to make common UK tax questions easier to explore before users file, pay or speak to HMRC or a qualified adviser. Calculators provide estimates, not personalised tax advice.