Uh, no. The only reason to put cash into CPF on January 1 (or any day prior to very near the end of the month) is if you’re trying to get something credited before something else is credited or debited. For example, if your MediSave Account is at $60,000 today (the 2020 Basic Healthcare Sum), and if your payroll contributions ordinarily land in your CPF accounts on the 10th day of the month give or take, and if you’re trying to add $3,000 of cash to your MediSave Account to raise it to the 2021 BHS before your payroll contributions hit, then it’ll be a good idea to do that on, say, January 5th. (MediSave contributions must still fit within the BHS and CPF Annual Limit.) Otherwise, unless you’re trying to beat something else to the punch, no, wait until the end of the month. Your cash is earning a little interest elsewhere, so set a reminder to yourself on your smartphone (or whatever) and don’t worry about it.