There's no PAYE-equivalent deduction to model here: the UAE levies no personal income tax on employment salaries, for any nationality, and there's no payroll social-security deduction on an expatriate employee's paycheck either. Whatever gross package you're quoted is exactly what lands in your account each month, which is why this calculator's "take-home" figure is simply your gross salary restated.
The one figure that genuinely takes work to get right is gratuity, the lump sum your employer owes you when you leave. It's calculated on basic salary only, not your full package, using 21 days' basic pay per year for your first 5 years of service, then 30 days' basic pay per year after that, capped at 2 years' basic salary in total. Since resignation and termination now pay identically (Federal Decree-Law No. 33 of 2021, in force since February 2022), the only variable that actually matters for your gratuity is your basic-salary figure and your tenure.
Most UAE offer letters bundle basic salary, housing allowance, and transport allowance into one headline package number, commonly 60-80% of that figure is basic salary, with the rest split across allowances. Two people on an identical total package can end up with meaningfully different gratuity payouts purely because of where that basic-salary line sits, which is exactly what our package-split calculator makes concrete.