My spouse (Dependent pass holder, non-Singaporean, non-PR) is being offered a Contract for Service by a Management Consulting firm from India (Client) to work as an Independent consultant in Singapore on a Project (commission basis).
Before entering into the contract, need understand the below

1. Work permit - can a Dependent pass holder engage in a "Contract for Service" as an independent consultant in SG? Are there any permissions required from MoM?
Closest information I could find is as below:
http://www.mom.gov.sg/employment-practi ... ation.aspx
2. Tax Liability - what would be the tax liability of the Independent Consultant in SG?
Closest information I could find is as below. Note that there is no Employer-Employee relationship so the Employer definition does not apply.
http://www.iras.gov.sg/irashome/page.aspx?id=1192
3. Governing Law - will the contract be legally binding to the Client in Singapore? How can commission for service provided be legally guaranteed for the Consultant in Singapore?
4. Reimbursement / Commission - Is the consultant better off in receiving the commission in INR or in SGD? I assume there will be a Double Taxation exemption for any Commission received even in India. (Exemption under Avoidance of Double Taxation Agreement (DTAs)).
Thanks.