What happens if I switch my subscription before it is set to renew?

If you have an active subscription and decide that you would like to switch to a different plan, your account will automatically be credited the prorated (unused) amount and apply it to any future charges.
For example, if you're halfway through your 6-month plan of $80, this means that you have approximately $40 worth of credit in your account. If you decide to switch to the 12-month plan for $150, your new subscription will begin that same day and you will be charged approximately $110.