There is no right moment for implementing such a big change, and we understand that you as a client haven't asked for this. But we need to keep making progress in order to keep your business compliant, not only now, but also in the future. With that being said, not migrating isn’t really an option. But if you are convinced that you cannot migrate, please contact your account manager via support@gvc.tax to discuss this on a personal level and we will figure it out.