Yes, you can. For this, you will have to complete a 'Change Application' form available on www.mbmf.sg
to opt out from the monthly salary.
Thereafter, a one-off donation can be made by:
Cash or Nets at Muis office;
Cheque payable to Muis;
Online at Muis website www.muis.gov.sg
Giro by filling up the 'Mosque Building Giro' form available on Muis website.