Disclaimer

Casvia provides educational calculators and general information. It does not provide personal financial, tax or investment advice.

Educational tools only

Everything on this site is designed to help you understand financial maths — how compounding works, what an ISA allowance is, how a Lifetime ISA bonus is calculated. The calculators are not advisory services, and nothing here should be read as a recommendation to buy, sell, save or invest in anything.

Results are estimates

• Results are based on the assumptions you enter, such as a constant assumed return.
• Actual results may differ — markets fluctuate, interest rates change, fees apply and inflation erodes purchasing power.
• No result on this site is a forecast, guarantee or promise of future returns.

Rules change

UK tax and savings rules are set per tax year and change frequently. Figures shown here are labelled with the tax year they apply to and were checked against official sources at the time of writing. Rules and thresholds can change. Check the latest official guidance before making financial decisions.

Official sources

Where UK figures are used, we reference official sources such as GOV.UK and HMRC (see each page's Sources section and the Methodology). Where we cannot verify a figure, we do not publish it.

Your responsibility

Use Casvia as a starting point for understanding, not as the final word. For decisions that affect your money, verify with official sources and, where appropriate, speak to a regulated financial adviser or tax professional about your personal circumstances.