ISA Growth Calculator — Current ISA Balance ₹3,750

Name: ISA Growth Calculator — Current ISA Balance ₹3,750
Creator: CalcHub

With current isa balance of ₹3,750, the future isa value is GBP2,75,609.

Last updated: 11 April 2026·Source: HMRC ISA Allowance

Current ISA Balance (GBP)

Monthly Contribution (GBP)

Max £1,666/month (£20,000/year ISA allowance)

Expected Annual Return (%) (%)

Investment Period (years)

Future ISA Value

GBP2,80,657

Total Contributed

GBP1,25,000

Tax-Free Growth

GBP1,55,657

What is the ISA Growth Calculator?

Individual Savings Accounts (ISAs) allow UK residents to save or invest up to £20,000 per tax year completely tax-free — no income tax, no capital gains tax, no dividend tax on ISA returns. The power of compound growth inside an ISA wrapper over 20+ years is substantial.

Formula

Future Value = Initial × (1 + r/12)^(12×years) + Monthly × ((1 + r/12)^(12×years) − 1) / (r/12). All growth is tax-free in an ISA.

P: = Initial balance
M: = Monthly contribution
r: = Monthly interest rate
n: = Number of months

How to use the ISA Growth Calculator

1
Step 1
Enter your current ISA balance
2
Step 2
Set your monthly contribution
3
Step 3
Choose expected return rate
4
Step 4
Set investment period
5
Step 5
View projected tax-free growth

Reviewed by

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CalcHub Editorial Team

· Financial Content Team

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Reviewed on 5 April 2026

Frequently asked questions

What is the ISA allowance for 2025-26?

£20,000 per tax year across all ISA types (Cash ISA, Stocks & Shares ISA, Innovative Finance ISA, Lifetime ISA). You can split the allowance across types.

Is ISA growth really tax-free?

Yes. You pay no income tax, capital gains tax, or dividend tax on returns within an ISA. This is one of the most powerful tax shelters available to UK residents.