Money saving expert Martin Lewis said everyone who moved house since 1993 could be owed money from overpaid council tax.
An investigation by MoneySavingExpert.com revealed more than £230 million sitting unclaimed in 1.7 million closed or inactive council tax accounts across England, Scotland and Wales.
Martin Lewis founder of MoneySavingExpert.com, said: "Councils are sitting on a staggering amount of money, at least £230million spread across 1.7 million accounts, which works out at an average of well over £100 sitting in each closed account.