In case you’ve forgotten, the employer CPF contribution has just been increased from 13% to 14.5% (effective 1 July).
If your gross income is $4,500 or more, this increase translates to, heh, an additional $67.50 to your CPF accounts each month. In fact, your Ordinary Account will get $45 and the remaining $22.50 goes to your Medisave Account. (Note that $4,500 is the contribution cap.)
Full details are available at this CPF Contribution page.