Tax deductible q: trying to budget, rent is 8 grand and i paid for 3 grand for Windows

[YoniWheretheSunDontShine]

So what can I get deducted? I've had no clue?
What % get deducted?

Btw I have searched and looked for calculators .

I know the window is definitely deductable inwant to know if I pay roughly 1400 tax on 8000...how much can I expect to pay for that year with the 3 grand window bill.

It will save you £600 if you are a standard rate tax payer or £1200 if you are a higher rate tax payer.

Thanks karma time!