Money Saving Expert Martin Lewis has said that millions of Brits are missing out on making an extra £1,000 each year.
Speaking on Good Morning Britain, he said: "If you're aged between 18 and 40 you're able to open a lifetime ISA.
"So you can put £4000 per year in and the state will add £1000 on top of that and you can do that each year.
"To buy a house the house has to cost less than £450,000 and you'll have to have had the account for more than a year before you can use it."
He continued: "The only issue would be, if in future you decided to withdraw the money, not for a house, you would effectively pay a 6.25% penalty on that.
"Or you could leave the money in there until you were 60 and then you can use it penalty free.
"But as long as you're definitely going to use it to buy a qualifying house, which is any residential property below £450,000 pounds then no-brainer, lifetime ISA."
