What's the behavior with price changes?

If you want to change the offer price, you cannot change the price at the offer directly. Prices must be changed at the price sheet. A change of the price sheet will then apply to all already purchased and all future offers. In the price sheet, you can define when the price changes are to come into effect, either immediately or at some time in the future. In the customer subscription detail view, the new price is displayed as soon as the new accounting period starts. 

Example
On January 1st, 2025, the price changes from € 15,00 to € 17,99.
All new customers who purchase the offer from 01.01.2025 will be charged the new price of € 17.99.
Customer A has already purchased the offer on 11.04.2024. The subscription has an accounting period of 1 month. The customer receives the first invoice with the new price on 11.01.2025. As soon as the new invoice has been created, the new price is also displayed in the subscription detail view in the customer account.

Note: All prices in the Merchant Backend are gross prices.