Calks.uk

Konstantin Iakovlev

Contains ads

About this app

DISCLAIMER: This app is NOT a government service. It is NOT affiliated with, endorsed by, or associated with the UK government, HMRC, GOV.UK, or any other government agency. Calks UK is an independent, privately developed calculator tool. All calculations are estimates only and should not be relied upon as professional financial, tax, or legal advice. Always verify results with official government sources and consult a qualified professional.

OFFICIAL GOVERNMENT SOURCES USED IN THIS APP:
- HMRC income tax rates: https://www.gov.uk/income-tax-rates
- National Insurance rates: https://www.gov.uk/national-insurance-rates-letters
- VAT rates: https://www.gov.uk/vat-rates
- Stamp Duty rates: https://www.gov.uk/stamp-duty-land-tax/residential-property-rates
- Capital Gains Tax: https://www.gov.uk/capital-gains-tax/rates
- State Pension: https://www.gov.uk/new-state-pension/what-youll-get
- Student loan repayment: https://www.gov.uk/repaying-your-student-loan
- Universal Credit: https://www.gov.uk/universal-credit
- Bank of England base rate: https://www.bankofengland.co.uk/boeapps/database/Bank-Rate.asp
- ONS inflation data: https://www.ons.gov.uk/economy/inflationandpriceindices

Calks UK is a free calculator app with 330+ tools for the UK. Updated for the 2025/26 tax year.

WORKS OFFLINE — all calculations run on your device. Your financial data never leaves your phone.

WHAT YOU CAN CALCULATE

Tax & HMRC — Income tax, Scottish tax (6 bands), National Insurance, VAT (20%/5%/0%), Stamp Duty, CGT, Inheritance Tax, Corporation Tax, Self-Assessment, Dividend Tax, Council Tax, Crypto Tax

Salary — Take-home pay (PAYE), holiday entitlement, maternity/paternity/sick pay, redundancy, salary sacrifice, bonus tax, NHS and teacher pay

Mortgage — Repayment, affordability, overpayment, buy-to-let yield, rent vs buy, shared ownership, stamp duty for first-time buyers

Pensions — State pension, workplace pension, tax relief, annual allowance (£60,000), drawdown, SIPP, pension vs ISA

Savings — ISA (£20,000), Lifetime ISA, compound interest, Premium Bonds, CGT on shares, NS&I

Loans — Student loan (Plans 1-5), personal loan, credit card payoff, car finance, APR, overdraft

Business — Sole trader tax, IR35, VAT return, Making Tax Digital, payroll, CIS, R&D tax credits

Benefits — Universal Credit, Child Benefit, Housing Benefit, Pension Credit

Plus: motoring, health, construction, energy, education, and everyday tools.

WHY CALKS UK?
- 330+ calculators, 100% free
- Works offline
- Your data stays private
- Dark mode
- Updated for 2025/26

This app is independently developed by Konstantin Iakovlev. It is not a government service.
Website: https://calks.uk
Contact: [e-mail]

What’s new

NEW:
• 4 new calculators — Winter Fuel Payment (2026/27 £35,000 income test), Pro-Rata Salary (part-time & term-time), Pension Emergency Tax and Tax Refund
• Search from any page — tap the magnifier in the header
• Share a link to your exact calculation from the top money calculators
• Take-home pay upgraded: Scottish rates, bonuses, salary sacrifice and a reverse "required salary" mode
• "Rates verified" badge shows when every figure was last checked against GOV.UK