The first forms that will be accessible through the new platform are the VIES and VAT returns forms.
By the end of March, the VAT form for the period 01/12/2022 – 28/02/2023 (due at 10/04/2023) will be submitted through the new platform. The VAT form will have the form as we already know it. Intrastat will join the TFA at a later stage.
Source Eurofast