A 2011 report noted MPF special voluntary contributions (SVC) waived subscription, redemption and switching fees, with lower expense ratios than comparable retail funds — management fees already reflected in prices. Bank Consortium Trust took lump sums from HK$500 and monthly plans from HK$300, a lower bar than bank-sold retail funds.
No need to wait for retirement — redeem anytime; but free withdrawals were typically capped at four a year, with service fees for extras or amounts under HK$5,000, and some trustees required minimum balances.
Compare fees, fund choices and withdrawal terms at MPF fund comparison.

How did voluntary contributions save on fees in 2011? A 2011 report noted...

MPFA data for the second quarter of 2016 shows voluntary contributions at a...

What are the benefits of voluntary contributions? MPF voluntary...