Generally in DOP RD account maturity will complete after 60 completed months i.e., 5 years from the date of opening. RD accounts in DOP can be extended after date of maturity and before completion of next month i..e., within one month after maturity date. For example if account is closed on 20/07/2016 then extension is allowed within one month as per POSB rulings i.e., before 20/08/2016.