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Simple UK Finance Calculators
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Edward McDonald
Edward McDonald 30 years in financial services · Built this so the numbers are finally easy to find.
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All calculators

Pick one and get a clear answer in under a minute.

14 live, 0 coming soon

Tax

Scottish Income Tax

All six Scottish bands from starter to top rate, with National Insurance and dividend tax.

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Tax

UK Income Tax

Basic, higher and additional rate for England, Wales & NI, with National Insurance and dividend tax.

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Tax

Take-home Pay

What you actually keep after tax, National Insurance, pension and student loan.

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Property

First-time buyer mortgage

Enter your deposit and property price to see your monthly payment, total interest, and how overpaying cuts your term.

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Property

Remortgage

Compare your current deal with a new rate, see your monthly saving and break-even point on switching costs.

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Property

Mortgage affordability

See how much you could borrow based on your income and deposit, with monthly repayments at 4×, 4.5× and 5× income.

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Property

Stamp Duty & LBTT

SDLT for England and NI, LBTT for Scotland, with first-time buyer relief and second home surcharges.

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Savings

Compound Interest

Compare three saving plans side by side: what your contributions and growth rate become over time.

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Savings

ISA Allowance Planner

Split your £20,000 across cash, stocks & shares, LISA and innovative finance.

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Budgeting

50/30/20 budget planner

Split your take-home pay across needs, wants, and savings to see how your spending compares to the 50/30/20 targets.

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Tax

100k salary trap

See the 60% effective marginal rate (67.5% in Scotland) between £100k and £125,140, and how much pension reduces it.

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Tax

Mileage allowance

Claim back business miles at the 55p HMRC rate for a single trip, a week of journeys, or your whole year.

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Conversion

Salary to hourly rate

Work out your gross and after-tax hourly rate from your annual salary, with NMW check and student loan support.

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Conversion

Percentage Calculator

Find a percentage of a number, what percentage one value is of another, the change between two numbers, or add and remove a percentage.

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Scottish rates included

Starter, basic, intermediate, higher, advanced and top bands, always up to date.

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All 2026/27 tax bands, thresholds and allowances in one printable page.

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