Can I claim full 50% expense under 44ada even if my real expense is much less?

I am an independent software development consultant who works for a Singapore company from India. My income for FY 25 26 was approx 18 lakhs INR. It is my first time filing ITR for business income as I was always working as an employee for dome company. Do I need to file ITR 4 and can I show complete 50% of my income as an expense under section 44 ADA without any receipts even if my real expense is much lower say 2%,10%, 15%, etc? I need you to know that all the income was received to my bank accounts digitally and has not been spent much.