From Gross Pay To Take-Home Pay
Your employer takes your share of CPF off your salary before paying you, and adds its own share on top. Both go into your CPF accounts. The rates depend on your age and fall in steps after 55.
CPF is not charged on everything. Monthly salary above the Ordinary Wage ceiling of $8,000 attracts no CPF. Bonuses are "additional wages", and CPF applies to them only until your total wages for the year reach $102,000. Above those limits, pay reaches you in full.
Income tax works differently. It is not deducted from your pay each month. IRAS bills you the following year, and many people pay by GIRO instalments. The "after-tax monthly figure" shows what is left if you set that money aside as you go.