The GST F5 (Form 5) consists of 13 boxes:
Box 1: Total value of standard-rated supplies
Box 2: Total value of zero-rated supplies
Box 3: Total value of exempt supplies
Box 4: Total value of (1) + (2) + (3)
Box 5: Total value of taxable purchases
Box 6: Output tax due
Box 7: Input tax and refunds claimed
Box 8: Net GST to be paid to/ claim from IRAS
Box 9: Total value of goods imported under under the MES/ A3PL/ Other Approved Schemes
Box 10: Did you claim for GST you had refunded to tourists?
Box 11: Did you make any bad debt relief claims?
Box 12: Did you make any pre-registration claims?
Box 13: Revenue
What to fill in each box?
http://www.iras.gov.sg/irasHome/page04.aspx?id=674