Cash ISA Limit Slashed for Under-65s Starting 2027

The UK government has outlined a change to how tax-free savings can be held in Cash Individual Savings Accounts (Cash ISAs), with new limits scheduled to begin in April 2027.

Under the plan, people under 65 would see their annual Cash ISA tax-free allowance reduced to £12,000 from the current £20,000. The government said the £20,000 annual allowance would continue to apply to Stocks and Shares ISAs, and the Cash ISA limit would remain at £20,000 for savers aged 65 and over.

Policy shift and stated objective

Chancellor Rachel Reeves presented the adjustment as part of a broader effort to encourage households to put more money into equities rather than keeping large balances in cash savings products.

The stated goal is to increase participation in stocks and shares and, in turn, channel more capital toward the UK economy. The government also described plans for a public awareness drive, framed as similar in spirit to the 1980s “Tell Sid” campaign.

How implementation could work

Alongside the allowance change, the government said banks would be instructed to send targeted messages to customers who hold substantial sums in low-interest accounts.

Details such as the precise criteria for “substantial sums,” the format of the communications, and how outcomes would be measured were not provided in the material available.

Who is most affected

The most direct impact would fall on under-65 savers who prefer cash-based ISAs for capital preservation and predictable interest. With a lower tax-free cash ceiling, some may need to place additional savings into other ISA options or hold more money outside ISA wrappers.

Those aged 65 and over would keep the existing £20,000 Cash ISA allowance, and investors using Stocks and Shares ISAs would not face a reduction in the headline annual limit. The design therefore changes relative incentives by making equity-based saving comparatively more attractive for many under-65 households.

Context, potential benefits, and concerns

The policy is framed around moving some of the estimated billions of pounds currently held in Cash ISAs toward equity investment. Supporters argue that a shift into stocks and shares could raise the pool of domestic investable capital available to UK companies, while offering households higher potential long-term returns than cash products.

Critics warn that reducing the appeal of Cash ISAs could deter saving among more risk-averse households. They also argue that savers who do not switch into other ISA routes could face higher tax exposure on savings held outside tax-sheltered accounts.

Risks and key unknowns

Building societies have highlighted a possible second-order effect: if deposits fall, their ability to fund mortgages and other lending could be constrained. They have also warned that weaker deposit inflows could lift borrowing costs for households and businesses that rely on credit.

Major uncertainties remain, including how many savers will change behaviour before April 2027 and whether bank messaging and a public campaign will materially shift preferences from cash to equities. The scale, timing, and market spillovers of any reallocation are not yet evidenced.