To set-off monies (e.g. due to over-payment, or excess non-revenue payment made earlier) from an upcoming payment, corporate service buyers (CSBs) need to make the transaction via the Contribute As You Earn (CAYE) online submission mode. This means that CSBs need to key in the full service fee payable to derive the MediSave payable via CAYE, and thereafter set-off any monies from the net service fee payable to the self-employed person.