if correct, should be 2/3 of your monthly salary (with regular additional bonus) times years (years + mths + days of srvs)
it will counter off with your mpf contribute d by the company, if your mpf selection got gain, can cover, then, the mpf company will give u money by cheque after about a month for their admin and calculation of the investment status.
others will left at your mpf account, if cannot cover then your employer needed to pay u till fit the amount.
*** if anything incorrect, kindly check with labor dept, they will let u know detailly.
i said, they will wait for the mpf co let them know whether can cover or not, it must included the gain/loss of your investment choice, it direct convince the gain or loss of the mpf lump sum.
not enough, your employer will pay u till reach the amount.