After adopting PTS and computing my taxable income at 50% of my receipts, can I claim any other deductions from such taxable income?

After adopting PTS and computing my taxable income at 50% of my receipts, can I claim any other deductions from such taxable income?

No. The income computed at the given rate shall be the final taxable income on which you have to compute tax and no further deductions are allowed from this income.