Rules are quite different even within the JAR region. In germany for example you can fly recreationally as much as you want, however every blockhour you get payed for is commercial flying and counts toward the 900 block hours per year limit and therefore the company has to be advised about that.
In austria apparently every hour flown counts towards the yearly limit and that includes recreational flying as well, be it in ultralights, gliders or powered planes.
Best is to ask the local authority about the rules that apply to you and make sure you stay within them. Sadly that can mean you can no longer fly your own airplane if you work fulltime.