I cant see any thread in here about tax so thought Id create one.

Basically this is my first year doing trading so the years coming to an end and we have to pay tax.

my question is i've just received 2 dividend in the last few weeks and they were fully imputed. so does that mean I don't have to mention the dividend to ird because tax has already been paid. I assume i will just have to give them the total of my capital gain from trading (all short term) a just pay a simple one of tax on that. Lastly does my student allowance count towards my income so I would have to add student allowance and capital gain together and pay a tax rate on that figure for my capital gain. I haven't worked this financial year so just those two.
cheers