Reduce Payment On Account for 2023/2024

Hello, this is my 1st Self Assessment, I have filled the SA form to 90% only. From the 'View your caculation' section, I have to pay the 1st & 2nd payment on account. If I submit the form, is the amount from "view your caculation' is the final amount, or HMRC will review it & send a final tax bill to me? Currently, I am unemployed since Decemeber 2023, & I'm can't go to work in this 2024/2025 tax year. (No employment salary, only income is come from bank saving interest, my personal allowance can cover it) Can I ask HMRC to reduce my advance payment of 'Payment on account'? Or I need to mention this situation in the Self Assessment 'Any Other information section'? If I must pay the advance payment to Payment on Account, can I ask for refund when I submit the 2024/2025 SA form next year? TIA

Hi
Please refer to the link for details about your payment Understand your Self Assessment tax bill There is also information here if you need help with payments If you cannot pay your tax bill on time