To transform a cancelled international registration into a Singapore national application, follow these steps:

1. Act within the deadline. File the transformation request with IPOS within three months from the date the international registration was cancelled (WIPO’s cancellation date). IPOS practice gives itself a window to process the cancellation, but the holder’s deadline is three months from cancellation.
2. Use the right form. File it as a trade mark application and indicate it is a “Transformation Application under Madrid Protocol” so IPOS records the link to the former IR.
3. Same mark, same or narrower scope. The transformed application must be for the same mark and for the same or no wider goods/services than the international registration.
4. Meet national formalities. Provide all required particulars and pay the Singapore application fee (the normal per-class fee applies — see “How Much Does Trade Mark Registration Cost in Singapore?”).
5. Preserve your dates. On acceptance, the application is treated as filed on the original international registration date and keeps any priority date claimed under the IR.
6. Expect fresh examination. Transformation is not automatic registration — the Singapore application is examined afresh on absolute and relative grounds like any national filing.

Source: Madrid Protocol Article 9quinquies; SG Trade Marks (International Registration) Rules, Rule 18; IPOS Work Manual, para 21.