Brits missing out on £217m in dormant cash ISAs – how to track them down

• Data from National Savings and Investments reveals over £217m is held in dormant cash ISA accounts, up nearly five times from four years ago.
• There are now 42,973 accounts classified as dormant after 15 years of inactivity, holding an average balance of £5,061 each.
• Savers are losing out on better returns as dormant accounts earn just 0.25 per cent interest, compared to market rates offering up to 5 per cent.
• An additional £614m is held in 1.1 million postal-only savings accounts, which require physical mail to manage.
• NS&I reunited customers with £201.5m in 2025 via its tracing service and urges people to check for unclaimed prizes and forgotten funds.

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