Your pageview billing cycle begins on the day you created your POWR account.
Upgrading from a Free Plan
If you purchase a paid plan after your account creation date, you will get a prorated credit towards your bill.
You created your POWR account on June 10th and purchased the 2500 monthly plan at $9.99 on June 20th. You will only be charged $6.66 on June 20th for the remainder of the billing cycle. You will pay $9.99 on July 20th.
Upgrading Your Paid Plan to Get More Pageviews
If you decide to upgrade your plan to increase your pageview limit, or to switch from monthly to yearly billing, you will get a prorated credit automatically applied to your bill. The amount you paid for your initial plan for that billing cycle will be deducted from your bill and displayed as prorated credit.
You created your POWR account on June 10th and purchased the monthly 2500 pageviews plan. On June 15th you decide to upgrade to the 5000 pageviews plan. Your monthly pageview limit increases immediately and you are only charged for 15 days remaining in your billing cycle, minus the amount you already paid. You would be charged the full amount when your billing cycle resets on July 10th.