Ordinary Wage Ceiling - currently $6k a month. This is the maximum amount of your monthly income that will attract
CPF contributions. Even if you make $10k a month, only $6k of it is subject to
CPF contributions (from both employer and employee).
Additional Wage Ceiling - currently $102k a year. This is the maximum amount of additional wage that attracts
CPF contributions per year. If you make $10k basic monthly and receive a $100k bonus at year end, only $30k of the bonus will be subject to
CPF contributions (because 102 – 6×12 = 30).
Compare your
CPF balances with an imaginary employee who is lucky enough to be earning above the contribution cap his whole life and also receiving $30k bonuses every single year:
https://www.salary.sg/2020/compare-y...unt-see-chart/
CPF Annual Limit - currently $37,740 a year. This is the maximum
CPF contributions (from both employee and employer) that one can get per year. If the mandatory contributions exceed this limit, it means you can't make any further voluntary contribution.