Cash ISA vs Easy-Access Savings Account June 2026: Which Pays More After Tax?

Cash ISAs offer tax-free interest, while easy-access savings accounts use the Personal Savings Allowance (PSA) to provide tax relief. For some savers, ISAs are essential; for others, a simple savings account outperforms. This guide breaks down the tax maths and shows which approach wins by income bracket and savings amount.

Personal Savings Allowance (PSA) Explained

The PSA allows basic-rate, higher-rate, and additional-rate taxpayers to earn interest tax-free up to a threshold.

2026/27 PSA limits:

• Basic-rate taxpayers: GBP 1,000 tax-free interest annually
• Higher-rate taxpayers: GBP 500 tax-free interest annually
• Additional-rate taxpayers: GBP 0 tax-free interest annually

How it works: Interest above the PSA limit is taxed at your marginal rate:

• Basic rate: 20% tax on interest above GBP 1,000
• Higher rate: 40% tax on interest above GBP 500
• Additional rate: 45% tax on all interest above GBP 0

Non-taxpayers: If you earn below GBP 12,570 (personal allowance 2026/27), all interest is tax-free regardless of amount. PSA is irrelevant.

Cash ISA: 100% Tax-Free Interest

A Cash ISA (Individual Savings Account) allows you to earn all interest completely tax-free, regardless of income bracket or amount saved.

Key features:

• ISA allowance: GBP 20,000 per tax year (1 April -- 31 March)
• All interest earned is tax-free
• Can hold up to GBP 20,000 across all ISA types combined (Cash ISA, Stocks & Shares ISA, Innovative Finance ISA, Lifetime ISA)
• Flexible ISAs: Can withdraw and replace without losing allowance
• No restrictions on income level -- even millionaires can use ISAs

Typical rates (June 2026): Best fixed-rate Cash ISAs offer 4.5-5.0% annually; easy-access Cash ISAs offer 3.5-4.2%.

When ISA Wins: The Tax Crossover Point

For basic-rate taxpayers, an easy-access account with GBP 1,000 PSA typically outperforms a lower-rate ISA.

Example 1: Basic-rate taxpayer (GBP 30,000 salary)

Scenario A: Cash ISA (4.5% rate)

• GBP 10,000 saved
• Interest: GBP 450 annually
• Tax: GBP 0 (ISA)
• Net interest: GBP 450

Scenario B: Easy-access savings (4.8% rate)

• GBP 10,000 saved
• Interest: GBP 480 annually
• Tax: GBP 480 -- GBP 1,000 PSA = GBP 0 (no tax due)
• Net interest: GBP 480

Winner: Easy-access account (higher rate, within PSA allowance)

The easy-access rate is higher, and the interest stays within the PSA, so no tax is paid. The extra 0.3% rate gain outweighs any ISA advantage.

Example 2: Higher-rate taxpayer (GBP 60,000 salary)

Scenario A: Cash ISA (4.5% rate)

• GBP 25,000 saved
• Interest: GBP 1,125 annually
• Tax: GBP 0 (ISA)
• Net interest: GBP 1,125

Scenario B: Easy-access savings (4.8% rate)

• GBP 25,000 saved
• Interest: GBP 1,200 annually
• Tax: (GBP 1,200 -- GBP 500 PSA) × 40% = GBP 700 × 0.40 = GBP 280
• Net interest: GBP 1,200 -- GBP 280 = GBP 920

Winner: Cash ISA (saves GBP 205 annually)

The higher-rate taxpayer pays 40% tax on interest above GBP 500 PSA. Even with a 0.3% higher rate, the easy-access account is taxed down to GBP 920. The ISA, paying GBP 1,125 tax-free, wins decisively.

The Rate Differential: How Much Does Interest Rate Matter?

The PSA benefit varies with savings balance and interest rates.

Basic-rate taxpayer (20% tax on excess):

• PSA covers first GBP 1,000 interest
• GBP 1,000 interest = GBP 50,000 saved at 2% rate
• GBP 1,000 interest = GBP 20,000 saved at 5% rate

If savings exceed these thresholds, tax bites. At 5% rate, any balance over GBP 20,000 incurs tax on excess interest.

Higher-rate taxpayer (40% tax on excess):

• PSA covers first GBP 500 interest
• GBP 500 interest = GBP 25,000 saved at 2% rate
• GBP 500 interest = GBP 10,000 saved at 5% rate

Higher-rate taxpayers hit the PSA limit much faster with large balances or high rates.

Example: GBP 20,000 saved at 5% interest rate

Basic-rate taxpayer:

• Interest: GBP 1,000
• PSA covers all: GBP 1,000 -- GBP 1,000 = GBP 0 tax
• No ISA needed

Higher-rate taxpayer:

• Interest: GBP 1,000
• PSA covers GBP 500; GBP 500 × 40% = GBP 200 tax
• ISA saves: GBP 200 annually

Comparison Table: ISA vs Savings by Income Bracket

Flexible ISAs: The Advantage Over Fixed-Rate Savings

Many modern Cash ISAs are flexible -- you can withdraw and redeposit without losing your ISA allowance.

Example: Flexible Cash ISA

Year 1: You deposit GBP 10,000 at 4.5% Year 2: You withdraw GBP 5,000 (need cash for emergency) Year 3: You redeposit GBP 5,000

With a flexible ISA, the GBP 5,000 redeposited does not count against your next year's GBP 20,000 allowance. You've effectively used GBP 15,000 of your allowance and retained access to GBP 5,000.

Traditional fixed-rate savings cannot offer this flexibility without terminating the account and incurring interest penalties.

For cautious savers: Flexible Cash ISAs provide tax-free interest plus emergency liquidity -- a significant advantage over fixed-rate savings accounts.

ISA Transfer Rules: Switching Without Losing Tax Relief

If you have an existing ISA with Bank A at a poor rate and want to move to Bank B with a better rate, you can transfer without breaking the tax-free status.

Transfer process:

1. Open new ISA with Bank B
2. Request a transfer from Bank A (Bank B usually manages this)
3. Bank A sends funds directly to Bank B (not through you)
4. ISA status preserved (tax-free interest continues)
5. This counts as a single subscription against your GBP 20,000 annual allowance (if funds are redeposited within the same tax year)

Important: Direct transfer preserves tax status. Withdrawing cash and redepositing loses the ISA status and creates a new subscription (using your allowance).

Decision Framework: ISA or Savings Account?

Use a savings account if:

• You're a basic-rate taxpayer with under GBP 20,000 saved (interest within PSA)
• The savings account rate is 0.5%+ higher than available ISA rates
• You don't need flexible access (you can accept fixed-term)

Use an ISA if:

• You're a higher-rate taxpayer (even with small balances, tax advantage emerges)
• You're an additional-rate taxpayer (no PSA available)
• You have savings over GBP 20,000-30,000 at typical 4-5% rates
• You want flexible access (withdraw and redeposit without penalty)
• You plan to hold savings long-term (tax savings compound over years)

Split between both if:

• You're a basic-rate taxpayer with moderate savings (GBP 30,000-50,000)
• Allocate up to GBP 20,000 to ISA (tax-free)
• Allocate remainder to savings account (up to GBP 1,000 interest within PSA)

Higher Interest Rates and ISA Advantage

In higher-rate environments (above 5%), ISA advantages amplify dramatically.

Example: GBP 25,000 saved at 5.5% rate

Basic-rate taxpayer:

• Savings account interest: GBP 1,375
• PSA covers GBP 1,000; tax on GBP 375 at 20% = GBP 75
• Net: GBP 1,300
• ISA: GBP 1,375 (advantage GBP 75)

Higher-rate taxpayer:

• Savings account interest: GBP 1,375
• PSA covers GBP 500; tax on GBP 875 at 40% = GBP 350
• Net: GBP 1,025
• ISA: GBP 1,375 (advantage GBP 350)

The higher the interest rate environment, the more critical the ISA wrapper becomes for higher-rate taxpayers.

Stocks & Shares ISA vs Cash ISA

Some savers consider Stocks & Shares ISAs (investing in equities/bonds) instead of Cash ISAs. Key differences:

For most emergency savers, Cash ISA offers better security. For long-term investment, Stocks & Shares ISA may offer superior returns.

Conclusion

For basic-rate taxpayers with small-to-moderate savings, easy-access savings accounts often provide better returns (higher rates within PSA limits). For higher-rate taxpayers, additional-rate taxpayers, or anyone with substantial savings (GBP 25,000+), Cash ISAs provide meaningful tax advantages. Flexible Cash ISAs add emergency liquidity. If interest rates rise further, ISA advantages become even more compelling. Model your specific scenario using our

to compare net returns after tax.