Is it mandatory to register my lease contract, and who is responsible for registering the lease contract?

Yes, residential lease contracts in Italy must be registered with the Italian Revenue Agency within 30 days from signature. The responsibility is usually on the landlord, who may delegate this activity to a real estate agent or tax advisor; Principal can help you review your lease to clarify who is designated to handle the registration, follow up after the tenancy start, and obtain the registration receipt.