I think you meant £200, rather than £300, but it's a good point. Given that most of us are paying tax and NI, the actualy cost in hours worked is a lot more than we realise. I don't add the money to my pension, but I do a lot of stuff myself. For example, my car needs a lot of work at the moment - probably 2/3 days worth. I actually don't mind doing that, and I really like my car, so it's ok. However, in reality, I should probably pay someone else to do it because they could have it all done in a day and I don't need to take time off work and order a couple of new tools (one of which is going to cost me £80, which is quite annoying!)