vAT exemption to subject to VAT: how to switch just before 25,000?

Hi,

I am currently VAT exempted and estimate that I will exceed 25,000 in September. Liantis informed me that there are only two moments when I can easily switch, which would be on 1 July. According to them, I can also switch just before reaching 25,000, but that is less straightforward. Is that correct? I would prefer to wait until around 24,000, as I work partly with private persons and a price increase is not ideal. So I want to remain exempted from VAT for as long as possible (and not charge vAT on the amount for private persons) this year.

Gr
Anke