Tax confusion?

Hey!

I'm looking to invest in an ISA here in the UK. I was wondering how tax would work when I get the money back? I'm looking at taking out a few thousand after a few years, how would that affect my income tax? I'm looking at sites like this tax tool but can't figure it out. Can someone advise?

Site is income-tax co.uk

Cheers!

Ph your accountant.

I clicked this thread to read about cannabis tax
we're not accountants