You are required to stamp a document before you sign it. If you sign a document, you are required to stamp it within the following time frame without incurring penalty.
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Stamping deadlines

You are required to stamp a document before you sign it. However, if you have signed a document and stamped it within the following time frame, no penalty will be charged:

  1. Within 14 days after signing the document if it is signed in Singapore or
  2. Within 30 days after receiving* the document in Singapore if the document is signed overseas

*For electronic documents, they are treated as received in Singapore in any of the following scenarios:
(a) the electronic document is retrieved or accessed by a person in Singapore; or
(b) the electronic document is stored on a device (including a computer) and brought into Singapore; or
(c) the electronic document is stored on a computer in Singapore.

Late payment of Stamp Duty

Penalties will be imposed on late payments.

For more details, please refer to  Late Payment of Stamp Duty.

To stamp your document online, please visit  e-Stamping Portal.