When a subscription renews, the shopper is charged the same price they were charged for the initial subscription unless you create a special renewal price list with renewal pricing for the product. Subscription renewal price lists are useful because they allow you to customize your renewal prices for subscription products.
If you want to create a subscription renewal price list simply create a new price list and select the subscription renewal type. Once you create a renewal price list (and it is active) renewals will be charged the price you have defined in the renewal price list.
There is a site setting called Renewal Price List Limitation in Days that can be used to help control what price a shopper is charged for their renewal when you have multiple renewal price lists, or when your renewal price list has an end date that occurs before a subscription is about to renew.
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