Martin Lewis has warned that half a million people on the National Living Wage might be underpaid.
The MoneySavingExpert said workers could be underpaid if they are required to buy items to do their jobs, such as safety clothing or tools.
Meanwhile, other workers may be losing out as they have unpaid working time, like having to get to work early to open the premises.
Mr Lewis has issued advice on how to can check if you are being underpaid and how to get more money if you are owed anything.
MoneySavingExpert has updated its guide on the minimum wage, including ways to check if you are getting paid less than you should.
For example, if you are required to buy anything to carry out your job, like tools or a uniform, your workplace has to ensure this does not mean your wage falls below the legal requirement. This applies however the cash is deducted.
It includes buying items in a shop, paying your boss for them or having cash taken from your salary.
If you get minimum wage, any time you spend working you should be paid for - including overtime, time spent in training, travelling time and time spent opening up or closing down a workplace.
On Twitter, Lewis said: "Are you on minimum wage? You may be underpaid, 500,000 are! Many who think they are on minimum wage are in reality actually being paid less than they should."
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