Martin Lewis has issued an urgent warning as more than one million people could be missing out on at least £3,700 a year extra.
The personal finance expert wrote in the latest editions of the MoneySavingExpert newsletter to urge people to check if they're eligible for Attendance Allowance.
The benefit is designed for those over the age of state pension who need additional help with personal care or need supervision due to an illness, disability, or mental health conditions.
Successful claimants could get weekly payments between £72.65 and £108.55 depending on the level of care they need. These payments are made every four weeks, equating to either £290.60 or £434.20 a month.
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