Hi Marcus, Firstly, you are still young! You still have 20 years before you hit 55. Time is still on your side and your own calculation proves it. ;) What you are thinking of doing (i.e. $130K lump sum contribution to you CPF-SA) is called a Minimum Sum Top Up (MSTU). This is meant to help us meet our retirement adequacy. My understanding is that it (together with interest earned) cannot be withdrawn for any other purpose. At age 55, the money will go to our CPF-RA and we will get a monthly payment for life from age 65. I would suggest doing a gradual top up to the SA over a number of years. This is because the first $7K of top up each year will allow you to enjoy income tax relief. Unless you do not pay income tax or pay very little income tax, this makes good sense......