Do I need to deduct previous years payments?

Hello, Need a quick bit of help. Filling out my self assessment and the tax calculation is a lot higher than last years. Do I need to deduct the payments I made January and July of this year? If so, where do I do this? I think my accountant did it last year but I cannot seem to find where on the form accounts for the prepayments. Thanks for the help. 

Name removed admin .

Hi,

No, the calculation only includes tax deducted at source. Your balancing payment will update on your statement to take into account the payments already made once you submit the return.

Thank you.