Martin Lewis urged viewers to check if they are eligible for benefits as he claimed millions are missing out.
The finance guru was speaking on his ITV show, giving Brits the latest advice.
Martin revealed that pensioners, parents, grandparents and those earning over £60,000 are not taking advantage of some of the benefits offered by the government.
Universal Credit
He started by informing viewers that Universal Credit has replaced many other benefits.
Anyone unemployed or those on lower incomes can claim Universal Credit.
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The money you receive is based on you and your partner's income but reduces if you and your partner have over £6,000 in savings.
If you have £16,000 in savings, it stops.
However, Martin urged any families who earn less than £30,000 a year to check their eligibility using the Government's calculator.
He says it will take around 10 minutes and you could be entitled to the benefit.
Pension Credit
Martin revealed over 1.2m people over state pension age are missing out on Pension Credit.
The benefit tops up your pension if your weekly income is below £174 as a single person or £265 as a couple.
You may also get the top up if you've small saving and income above that.
Pension Credit is also what Martin calls a "gateway benefit" as you can get a TV licence, council tax reduction and warm home discount.
Children
You can receive carer credit if you care over 20 hours a week for someone on a benefit and if you're a low earner caring over 35 hours for a person with disabilities you can get Carer's Allowance for up to £67 per week.
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You won't be able to claim child benefit if a parent is earning over £60,000. But the non-working parent should apply "to not get it", a move which in turn triggers National Insurance credits.
And if you look after a child under 12 while parents are at work - for example grandparents - adult childcare credit lets parents transfer their National Insurance credit so the grandparents have the money the parents would get to look after the child. You can find more details on how to apply for it here.
