You can invest your CPF savings under the CPF Investment Scheme – OA (CPFIS-OA) after setting aside $20,000 in your OA. Likewise for CPF Investment Scheme – SA (CPFIS-SA), you will need to set aside $40,000 in your SA.
In addition, you can only invest your OA savings up to 35% and 10% of your investible savings* in stock and gold respectively, also known as the stock and gold limits.