I would like to set up a business in my spare time where I would make simple database software for small businesses - I'm currently employed full time where part of my role involves this already, though for a manufacturing business so I don't think it would be a conflict of interest.
My concerns are that I remember when I started this job there was some sort of declaration signed/box ticked where I said 'I do not work for another company', though I can't find it in my contract.
Would doing something like this cause any problems with my full time job? I have no intention of eventually leaving to pursue my project full time at the minute and plan to communicate that to my manager, as well as making it clear that I understand not to work on my project during work hours. My understanding is that they will find out anyway with tax or something (?) so my current thinking is to just mention it before I start. Could you advise the best way to go about this?