If I subscribe to a 30-day free trial for the Professional plan with a monthly payment and upgrade to the annual payment before the 30 day free trial expires, when does my billing plan start?

If I subscribe to a 30-day free trial for the Professional plan with a monthly payment and upgrade to the annual payment before the 30 day free trial expires, when does my billing plan start?

Your billing for the upgraded plan will begin after the 30-day trial.