Tax return for self-employed persons in secondary occupation without income as self-employed persons

Dear Sir/Madam,

As a pensioner, I have been self-employed in a secondary occupation since the third quarter of 2023. My company number was activated for VAT purposes on 01/02/2024. However, I am exempt from VAT.I had no income as a self-employed person last year. My only expenses are the costs of my quarterly social security contributions and my registration with Accerta. I subscribed to Dexter at the beginning of this year and also have a .

My question: Do I need to submit part 2 of the tax return with my first part? If so, do I need to submit both parts next week or can I submit part one now and part two later?

Thank you in advance.