• Letter of sponsorship.
• Original Marriage Certificate/ Birth Certificate.
• Sponsor's Passport copy.
Employer's employment letter:
a) For employees: Letter issued by Singapore company that states the employer's name, passport number, job title, salary, date of hire, date of travel and purpose of trip (original and valid within 1 month of its issuance). OR
b) For self-employed: One latest printout of ACRA biz profile (valid within 1 month)
c) For unemployed: Spouse' company letter (original), copy of NRIC and marriage certificate in English (original and copy).
• Employer's recent 3 months Singapore bank account statements / bank passbook (original and copy) / e-statements. Debit card, credit card and overseas bank account statements are NOT accepted.
• Letter of Guarantee. The sample can be found here