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ISA vs savings account: which is better?

Updated June 2026 8 min read

Quick verdict

A normal savings account can be better if it pays a higher rate and your interest stays within your Personal Savings Allowance. A Cash ISA is stronger for higher-rate taxpayers, larger balances or long-term tax protection.

Option A

Cash ISA

A Cash ISA shelters interest from income tax and uses part of your annual ISA allowance.

Option B

Savings account

A savings account pays taxable interest, though many savers can earn some interest tax-free through the Personal Savings Allowance.

Side-by-side comparison

ISAs are tax-free, but that only matters if tax would otherwise be due. Regular savings accounts can pay competitive rates and may be tax-free in practice for many savers because of the Personal Savings Allowance. The best choice depends on balance, tax band, rate and how long you plan to keep saving.

Tax on interest

Cash ISA

NoneBetter

Savings account

Taxable above allowance

Annual deposit limit

Cash ISA

ISA allowance applies

Savings account

No ISA limitBetter

Headline rates

Cash ISA

Can be slightly lower

Savings account

Can be higherBetter

Large balances

Cash ISA

Strong tax shelterBetter

Savings account

Allowance used faster

Higher-rate taxpayers

Cash ISA

Often strongerBetter

Savings account

Less allowance

Best for

Cash ISA

Tax protection

Savings account

Best rate within allowance

Pros and cons

Cash ISA pros and cons

Pros

  • ✓Interest is tax-free
  • ✓Useful for larger balances
  • ✓No tax return reporting for ISA interest
  • ✓Long-term tax shelter

Cons

  • -Annual allowance applies
  • -Rates may be lower
  • -Unused allowance cannot usually be carried forward
  • -Less useful if no savings tax is due

Savings account pros and cons

Pros

  • ✓Often strong headline rates
  • ✓No ISA contribution limit
  • ✓Wide choice of accounts
  • ✓Can be tax-free in practice within allowance

Cons

  • -Interest can become taxable
  • -Higher earners have less or no allowance
  • -Large balances can trigger tax
  • -No permanent tax wrapper

Cost examples

Modest basic-rate saver

If interest stays within the savings allowance, the higher-rate account may beat the ISA.

Likely fit
Best rate

Larger cash balance

As interest exceeds the allowance, the ISA tax shelter becomes more useful.

Likely fit
Cash ISA

Higher-rate taxpayer

A smaller savings allowance can make ISA protection valuable sooner.

Likely fit
Cash ISA

When to choose Cash ISA

  • ›Your interest may exceed your savings allowance
  • ›You are a higher or additional rate taxpayer
  • ›You want long-term tax-free savings
  • ›You have ISA allowance available
  • ›Rates are close to normal savings accounts

When to choose Savings account

  • ›Your savings are modest
  • ›The rate is meaningfully higher
  • ›You need to deposit above the ISA allowance
  • ›You are comfortably within your Personal Savings Allowance
  • ›You want the widest product choice

FAQs

Is a Cash ISA always better?

No. If a normal savings account pays more and your interest is within your Personal Savings Allowance, the savings account may leave you better off.

What is the Personal Savings Allowance?

It is the amount of savings interest some taxpayers can earn before paying income tax. The allowance depends on your tax band.

Can I have both an ISA and a savings account?

Yes. Many people use both, with an ISA for tax-free savings and a normal account for flexibility or better rates.

Do I declare ISA interest on a tax return?

No. ISA interest is tax-free and does not need to be declared.

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