VAT is a seperate issue, we are talking here about personal taxation.
But you are correct VAT does have a limit at which point you have to register.
You can also register even if below the limit.
This is to your advantage only if buying goods that include VAT for resale.
I would say as a service provider avoid registering for VAT until you reach that limit. That way customers not registered for VAT will not be put at a disadvantage dealing with you.
Also VAT reg is another paperwork issue that requires attention.