Loop over parameters

Hello

I am simulating a very simple RBC model and would like to let the constant tax rate vary. I can do this manually by just resetting the paramter every time I run the code. However, is it possible to perform this automatically? Say, I want the tax rate to increase by 0.1 every time (from 0 to 0.5).
Can I do this in my mod-file or do I have to write a m-file?

Thanks a lot,
PPilo