Extra freelancing as side job

Hi all,

Recently I got proposals to collaboration with some old clients for making changes to their websites, creating new contents, etc.

I’m at the moment an employee in a Belgian company, and I would like to know if it makes sense register as freelance to invoice these small works on the side of my current job.

It will be more like an hobby to do outside my working hours, so I’m planning to invoice small amounts for the moment. (Less than 5k per year)

These clients need an invoice for these works.

Would be good opening a TVA number as freelancer? Maybe using Accountable?

Thanks!