Free UK tax guidance
We're here for the businesses that actually pay
Your tax code gets longer every year. Your accountancy fees climb with it. Meanwhile, the companies writing the most zeros on their invoices write the fewest on their tax returns. Calculators, statute-cited guides, plain English. No signup, no tracking, no email capture.
Where do you want to start?
If you know what your tax situation is, jump straight to the right starting point. If not, the calculators + guides below cover the full UK tax landscape.
Sole trader
Self-employed, freelancer, single-handed trade — file via Self Assessment.
Start here →
Limited company director
Salary-dividend mix, Corporation Tax, IR35, director's loan account.
Start here →
Landlord
Section 24, 60-day CGT, FHL abolition, replacement of domestic items.
Start here →
Side hustle
£1,000 trading allowance, hobby vs trade, OECD platform reporting.
Start here →
Employee with extra income
Dividends, savings interest, HICBC, £100k Personal Allowance taper.
Start here →
Moving abroad
SRT, P85, split-year, NRCGT, April 2025 IHT reform + LTR test.
Start here →
Most-used calculators
The calculators that answer the questions people search most often. The full inventory is below.
Income Tax Calculator →
Income tax + NI for 2025/26 — bands, allowances, £100k taper.
Capital Gains Tax Calculator →
Residential property + other-asset gains with £3,000 AEA.
Corporation Tax →
Small-profits, marginal relief, main rate — with associated-company logic.
Dividend Tax Calculator →
Dividend tax including the £500 allowance across bands.
Salary vs Dividend Planner →
Optimal extraction mix for owner-managed companies.
Stamp Duty Calculator →
SDLT including the 5% additional-property surcharge.
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Full index
Every calculator, guide, and trade page on the site. Expand a section to browse.
All calculators (18)ShowHide
- Income Tax Calculator 2025/26
- Dividend Tax Calculator
- Capital Gains Tax Calculator
- Stamp Duty Calculator
- Salary vs Dividend Calculator
- Salary vs Dividend Planner
- Scottish Income Tax
- Corporation Tax
- Pension Tax Relief
- Salary Sacrifice (NI savings)
- ISA vs GIA
- Inheritance Tax Estimator
- R&D Tax Relief Estimator
- Tax Year Comparison
- VAT Scheme Calculator
- SA Penalty Calculator
- Side Hustle Tax Calculator
- Marginal Rate Calculator
All guides (15)ShowHide
- Companion Guides (Hub)
- Self-Assessment
- Self Assessment Deadlines 2025/26
- UK Income Tax 2025/26
- Income Tax Bands 2025/26
- Personal Allowance 2025/26
- UK Dividend Tax 2025/26
- Dividend Allowance 2025/26
- National Insurance Rates 2025/26
- UK Capital Gains Tax 2025/26
- UK Stamp Duty 2025/26
- HMRC Penalties — complete reference
- VAT Flat Rate Scheme Rates
- Contractors and Freelancers
- UK Tax Rates Reference 2025/26
Trade-specific guides (22)ShowHide
About TaxKiln
TaxKiln is part of the Kiln Guides network, editorial reference content for UK SMEs. Statute-cited, updated each tax year, free to use. We don't recommend specific accountants or software. We explain the rules.
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Running a small business is hard. We appreciate that. Across all of these, we want nothing from you but your work to get better.