According to analysis, motorists could save more than £ 300 on average if they switch themselves 20 days before their policy expires compared to the renewal date.
According to Comparethemarket.com, auto insurance is on average £ 306 cheaper if drivers switch policies 20 days before the renewal date, compared to the day their policy ends.
Finding a new listing on the day the policy ends costs an average of £ 707, the website found, compared to £ 401 for someone who switched 20 days earlier.
The price tends to go up as the renewal date gets closer, with a policy typically costing £ 431 two weeks before, £ 506 one week before and £ 617 one day before a policy expires, the website found.
About a third (32%) of quote comparison requests are made the day before a policy ends or on the end date, Comparethemarket.com said.
More than half (58%) would like to switch within a week after their policy expires.
Traditionally, insurance costs are often cheaper at the beginning of the year due to discounts from insurers.
Insurance prices are based on various risk factors including annual mileage, make and model of vehicle, and previous claims history.
Average premiums in December are also typically £ 50 higher than the rest of the year.
At the beginning of 2022, however, there will be a price adjustment for insurance companies.
The Financial Conduct Authority (FCA) is introducing new rules in January that will prevent insurers from offering existing customers higher levels of auto and home insurance than new customers.
The move is expected to save consumers a total of £ 4.2 billion over 10 years.
It will end the “loyalty penalty” paid by loyal customers whose prices are rising annually – but it could mean regular switchers struggle to find ultra-cheap deals.
Fewer cars on the roads during the lockdown and personal injury reforms have recently helped keep auto insurance premium costs down.
Ursula Gibbs, Director of Comparethemarket.com, said, “While auto insurance was typically cheap at the start of the year, 2022 could be different.
“With a major change in regulation imminent, insurance costs could rise significantly over the next year. If your policy is auto-renewing in the next few weeks, it may be better to switch sooner rather than later. “