Martin Lewis has urged all UK car owners to check their insurance renewals before new rules begin.
The Financial Conduct Authority (FCA) has banned insurers from increasing prices when existing customers are renewing their insurance.
The FCA has said that by January insurers will not be allowed to charge more for existing customers, saving Brits tons of cash.
And Martin Lewis has said in his weekly newsletter that it could actually lead to higher prices in the coming months, reports the Sun.
He said: "While the new regime starts in January, insurers will likely start to shift algorithms before - there are even signs now.
"This likely means the cheapest prices will disappear rapidly for those who compare and switch.
"So I suggest everyone check as soon as possible to see if you can cut costs by grabbing cheaper switchers' deals."
Even if your policy isn't up for renewal, it could be worth switching now to lock in cheaper prices, as long as the savings are big, Martin added.
Most insurers let you switch for a £50 cancellation fee and will give you a pro-rata refund, if you haven't claimed on the policy.
To find the cheapest car insurance for you, check comparison sites such as Compare the Market and Go Compare as well as with providers directly.
Cashback websites including TopCashback and Quidco are also a great way to earn some extra money if you’re moving to a new provider.
Analysis by MoneySavingExpert has found that 23 days ahead of renewal is the best time to get a new car insurance quote, and it could halve costs.
