For those of you who are going along the VC to MA strategy here, I'd like to point out that you can still top up once a year, subject to the contribution cap, even if your MA might be maxed out already.
This is because, technically, your MA will never be truly maxed out until you reached 65.
The BHS is adjusted upwards yearly, but because CPF credits our interest for each account at the end of the year, the interests from the maxed out MA account is moved out before the new year. It won't stay in the MA to fill up the new ceiling.
So on 1st Jan each year, the ceiling for the MA is adjusted upwards and will allow incoming contributions again until the new ceiling is hit. You can top the difference between the new and old ceiling.
The adjustment is usually around $2k - $2.5K.