UK pensions & investments · 2025/26
UK pensions & investing calculators, in plain English
Plan for the long term with calculators built around UK pension, ISA and investment rules.
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10 calculators- investing
Compound Interest Calculator
Project investment growth over years and decades.
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ISA vs GIA Comparison
How much tax does an ISA actually save?
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Capital Gains Tax (Assets)
CGT on shares and other assets above the allowance.
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Dividend Tax Calculator
Tax on dividends beyond the allowance.
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Workplace Pension Calculator
Employer + employee auto-enrolment contributions.
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Pension Tax Relief Calculator
How much tax relief you actually get back.
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State Pension Age Lookup
When can you claim your State Pension?
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Inflation Impact Calculator
What your savings are really worth in 10 years.
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FIRE Calculator
When could you retire early? Uses the 4% rule.
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Premium Bonds Return
Expected vs guaranteed savings returns.
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Planning for the long term
The State Pension covers the basics; the rest is up to you and your employer. ISAs shelter growth from tax, while general accounts don’t. These tools help you forecast both — and decide how much to put away.
We update these calculators each tax year to match HMRC’s latest allowances, ISA limits and the State Pension uplift.