If you wish to change the Registrant of a domain name and renew it at the same time, you will only need to pay the cost of the renewal, provided that the change of registrant is completed successfully before the expiration date of the domain.
If the required documentation is not received and/or the change is not completed by the expiration date of the domain, you will need to pay an additional cost equal to the cost of the main service activated with the domain.
Therefore, we recommend that you initiate the process in advance (at least 15 days before the expiration date), to avoid making two payments.
N.B. The documentation required for the Change of Registrant varies depending on the type of domain extension (.it, .eu, .com, etc...).
See the various instructions.