The Money Saving Expert founder has told motorists in the UK to check their car insurance policies now.
Martin Lewis sent the warning as insurers will be banned from charging existing customers more on their policies from January.
It means policyholders that renew will not pay more than someone who has just signed up to the insurer.
The MSE expert warned it could actually lead to higher prices in the coming months.
Writing in his newsletter, Martin said: "It's good news for those who never switch, as renewals will be cheaper.
"But it's bad news for those who actively seek the best deals."
He added: "While they should still be able to save due to competition, differences will fall, and they'll pay more overall."
Martin said in the next few months, it's likely some of the best deals will start to disappear as new price algorithms kick in.
He wrote: "It's possible today is a sweet spot to check car insurance and home insurance prices.
"While the new regime starts in January, insurers will likely start to shift algorithms before – there are even signs now."
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Martin urged drivers to act quickly to avoid paying more money on their insurance.
He continued: "So I suggest everyone check ASAP to see if you can cut costs by grabbing cheaper switchers' deals."
If you're approaching the end of your policy, you could shop around for a cheaper deal now.
Even if you're in the middle of your policy it's still worth checking comparison websites for hot deals.
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Martin added: "Even if not at renewal, if savings are big, it can be worth moving now to lock in cheaper prices."
Most insurers will let you switch for a £50 cancellation fee, but if the savings are big, it could be worth it.
You can get any refunds owned on a pro-rata basis, but you might lose your 12 month no claims bonus for the year.
According to Money Saving Expert research, the best time to find the best deals is 23 deals before the policy is due to start.
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