Savers under the age of 65 face a sharp cut in their tax-free cash Isa allowance from £20,000 to £12,000 starting in April under new government rules.
The total annual Isa limit across stocks and shares accounts will remain at £20,000. Savers wishing to use their full allowance will need to funnel the remaining £8,000 into a stocks and shares Isa or forfeit that portion of their tax-free capacity.
Individual Savings Accounts, known as Isas, allow UK residents to hold cash or investments without paying income tax or capital gains tax on interest and growth. Cash Isas are by far the most popular account type among savers seeking risk-free interest.
The Treasury stated that final details of how the new rules will operate will be published in the autumn. However, industry insiders expect full guidance to be released as early as next month, ahead of Chancellor John Healey's first Budget on October 28.
The upcoming changes stem from tax measures introduced by previous Chancellor Rachel Reeves in the Autumn Budget 2025.
Industry body the Building Societies Association stated last week that the Chancellor faces a choice between pressing ahead with the complex changes or scrapping them altogether. Financial analyst Sylvia Morris noted that the Chancellor is unlikely to abandon the plans, as they represent a major revenue raiser for the Treasury.
Transfer restrictions and tax penalties on cash
Under the new rules, savers under 65 will no longer be permitted to transfer money from a stocks and shares Isa into a cash Isa. The restriction aims to prevent individuals from placing up to £8,000 into an investment Isa and subsequently moving it into tax-free cash.
Savers will also face tax charges if they hold uninvested funds in investment accounts. The government will levy a 22 per cent tax on interest earned on cash held inside a stocks and shares Isa, regardless of the account holder's age.
Research from consumer group Fairer Finance shows that Isa platforms will be permitted to pay little or no interest on cash held within shares Isas. Many platforms currently pay interest below 2 per cent, whereas cash Isas offer tax-free returns above 4 per cent.
Rules for over-65s and retirement planning
Savers aged 65 and over will retain the full £20,000 annual cash Isa limit. This higher limit applies from the start of the tax year in which a saver turns 65. A saver whose 65th birthday falls in September 2027, for example, will gain access to the £20,000 cash allowance from April 2027.
The restriction on moving money between account types adds complexity for savers nearing retirement, who frequently transition assets from stocks into cash to protect capital.
Top cash Isa interest rates available now
For savers seeking easy-access flexible accounts, app-based provider Trading 212 currently offers the top rate of 4.6 per cent. The account permits unlimited withdrawals but includes a one percentage point bonus for the first year, making it advisable to review the rate after 12 months.
A flexible Isa allows savers to withdraw money and replace it within the same tax year without reducing their annual allowance. With a non-flexible Isa, any replaced funds count against the annual limit.
Among branch-based accounts, Coventry Building Society pays 4.25 per cent on its one-year 4 Access Isa. The account is flexible but limits savers to four withdrawals per year.
Hargreaves Lansdown offers a higher rate of 4.52 per cent on a non-flexible account with no bonus or withdrawal restrictions. App provider Spring pays 4.01 per cent, representing the top rate for a flexible Isa with no bonus or withdrawal limits.
For fixed-rate Isas, provider Vida offers 4.7 per cent on a one-year fix, 4.77 per cent on a two-year fix, and 4.85 per cent on a five-year fix.
Accounts with introductory bonuses or withdrawal limits are excluded from standard star buy tables, as are accounts not backed by the Financial Services Compensation Scheme up to £120,000.
