The simplest calculation is as below:
Annual salary is – MYR 65,000
The first MYR 50,000 = MYR 1,800 tax
The next MYR 15,000 x 13% = MYR1,950
Total tax payable is MYR 1,800 + MYR 1,950 = MYR 3,750
However, the above have not include those tax exemptions as well as tax rebates. Hence, the tax payable can be lower than MYR 3,750. You may estimate your tax payable using a Malaysia income tax calculator via this link.