Pay Singapore Income Tax via POSB iBanking

You can choose to pay either referencing TAX REF NO. or PYMT VOUCHER NO.,

For TAX REF NO., actually it's your NRIC,

For PYMT VOUCHER NO. (you have to get this number from mytax.iras.gov.sg),

For my case, took two days for mytax.iras.gov.sg Account Summary to be updated. Very convenient.