ISA (Individual Savings Account) Calculator (UK)

Calculate your potential savings with our ISA calculator. Optimize your personal finance strategy with precise projections.

Full original guide (expanded)

ISA (Individual Savings Account) Calculator (UK)

Project ISA savings growth from contributions, rate, and time horizon.

ISA Calculator

Estimate the future value of an ISA with inputs for contributions, rate, and duration.

Results

Total Contribution £0.00
Total Interest Earned £0.00
Final Balance £0.00

Data Source and Methodology

All calculations are based on the formulas and data provided by Aviva. All calculations are strictly based on the formulas and data provided by this source.

The Formula Explained

\( A = P \left(1 + \frac{r}{n}\right)^{nt} + \frac{C((1 + \frac{r}{n})^{nt} - 1)}{r/n} \)

Glossary of Variables

  • P: Initial Investment
  • C: Annual Contribution
  • r: Annual Interest Rate
  • n: Number of compounding periods per year
  • t: Number of years
  • A: Final Account Balance

How It Works: A Step-by-Step Example

Imagine an initial investment of £1,000 with annual contributions of £5,000 over 10 years at an annual interest rate of 5%. The calculator uses these inputs to project your savings growth over the period.

Frequently Asked Questions (FAQ)

What is an ISA?

An ISA is a tax-efficient savings account available in the UK.

How does the interest compound?

Interest typically compounds annually, but it can vary depending on the provider.

Is there a limit to how much I can contribute?

Yes, ISAs have a maximum contribution limit set by the UK government each tax year.

Audit: Complete
Formula (LaTeX) + variables + units
This section shows the formulas used by the calculator engine, plus variable definitions and units.
Formula (extracted LaTeX)
\[','\]
','
Formula (extracted text)
\( A = P \left(1 + \frac{r}{n}\right)^{nt} + \frac{C((1 + \frac{r}{n})^{nt} - 1)}{r/n} \)
Variables and units
  • T = property tax (annual or monthly depending on input) (currency)
Sources (authoritative):
Changelog
Version: 0.1.0-draft
Last code update: 2026-01-19
0.1.0-draft · 2026-01-19
  • Initial audit spec draft generated from HTML extraction (review required).
  • Verify formulas match the calculator engine and convert any text-only formulas to LaTeX.
  • Confirm sources are authoritative and relevant to the calculator methodology.
Verified by Ugo Candido on 2026-01-19
Profile · LinkedIn

ISA (Individual Savings Account) Calculator (UK)

Project ISA savings growth from contributions, rate, and time horizon.

ISA Calculator

Estimate the future value of an ISA with inputs for contributions, rate, and duration.

Results

Total Contribution £0.00
Total Interest Earned £0.00
Final Balance £0.00

Data Source and Methodology

All calculations are based on the formulas and data provided by Aviva. All calculations are strictly based on the formulas and data provided by this source.

The Formula Explained

\( A = P \left(1 + \frac{r}{n}\right)^{nt} + \frac{C((1 + \frac{r}{n})^{nt} - 1)}{r/n} \)

Glossary of Variables

  • P: Initial Investment
  • C: Annual Contribution
  • r: Annual Interest Rate
  • n: Number of compounding periods per year
  • t: Number of years
  • A: Final Account Balance

How It Works: A Step-by-Step Example

Imagine an initial investment of £1,000 with annual contributions of £5,000 over 10 years at an annual interest rate of 5%. The calculator uses these inputs to project your savings growth over the period.

Frequently Asked Questions (FAQ)

What is an ISA?

An ISA is a tax-efficient savings account available in the UK.

How does the interest compound?

Interest typically compounds annually, but it can vary depending on the provider.

Is there a limit to how much I can contribute?

Yes, ISAs have a maximum contribution limit set by the UK government each tax year.

Audit: Complete
Formula (LaTeX) + variables + units
This section shows the formulas used by the calculator engine, plus variable definitions and units.
Formula (extracted LaTeX)
\[','\]
','
Formula (extracted text)
\( A = P \left(1 + \frac{r}{n}\right)^{nt} + \frac{C((1 + \frac{r}{n})^{nt} - 1)}{r/n} \)
Variables and units
  • T = property tax (annual or monthly depending on input) (currency)
Sources (authoritative):
Changelog
Version: 0.1.0-draft
Last code update: 2026-01-19
0.1.0-draft · 2026-01-19
  • Initial audit spec draft generated from HTML extraction (review required).
  • Verify formulas match the calculator engine and convert any text-only formulas to LaTeX.
  • Confirm sources are authoritative and relevant to the calculator methodology.
Verified by Ugo Candido on 2026-01-19
Profile · LinkedIn

ISA (Individual Savings Account) Calculator (UK)

Project ISA savings growth from contributions, rate, and time horizon.

ISA Calculator

Estimate the future value of an ISA with inputs for contributions, rate, and duration.

Results

Total Contribution £0.00
Total Interest Earned £0.00
Final Balance £0.00

Data Source and Methodology

All calculations are based on the formulas and data provided by Aviva. All calculations are strictly based on the formulas and data provided by this source.

The Formula Explained

\( A = P \left(1 + \frac{r}{n}\right)^{nt} + \frac{C((1 + \frac{r}{n})^{nt} - 1)}{r/n} \)

Glossary of Variables

  • P: Initial Investment
  • C: Annual Contribution
  • r: Annual Interest Rate
  • n: Number of compounding periods per year
  • t: Number of years
  • A: Final Account Balance

How It Works: A Step-by-Step Example

Imagine an initial investment of £1,000 with annual contributions of £5,000 over 10 years at an annual interest rate of 5%. The calculator uses these inputs to project your savings growth over the period.

Frequently Asked Questions (FAQ)

What is an ISA?

An ISA is a tax-efficient savings account available in the UK.

How does the interest compound?

Interest typically compounds annually, but it can vary depending on the provider.

Is there a limit to how much I can contribute?

Yes, ISAs have a maximum contribution limit set by the UK government each tax year.

Audit: Complete
Formula (LaTeX) + variables + units
This section shows the formulas used by the calculator engine, plus variable definitions and units.
Formula (extracted LaTeX)
\[','\]
','
Formula (extracted text)
\( A = P \left(1 + \frac{r}{n}\right)^{nt} + \frac{C((1 + \frac{r}{n})^{nt} - 1)}{r/n} \)
Variables and units
  • T = property tax (annual or monthly depending on input) (currency)
Sources (authoritative):
Changelog
Version: 0.1.0-draft
Last code update: 2026-01-19
0.1.0-draft · 2026-01-19
  • Initial audit spec draft generated from HTML extraction (review required).
  • Verify formulas match the calculator engine and convert any text-only formulas to LaTeX.
  • Confirm sources are authoritative and relevant to the calculator methodology.
Verified by Ugo Candido on 2026-01-19
Profile · LinkedIn
Formulas

(Formulas preserved from original page content, if present.)

Version 0.1.0-draft
Citations

Add authoritative sources relevant to this calculator (standards bodies, manuals, official docs).

Changelog
  • 0.1.0-draft — 2026-01-19: Initial draft (review required).