US‑based multinational enterprises (MNEs) will continue to be subject to Singapore’s Qualified Domestic Minimum Top-Up Tax (QDMTT), even though they may not be subject to a top‑up tax under US rules.
Starting May 2026, in-scope multinational enterprise (MNE) groups must register for Singapore’s Multinational Enterprise Top-up Tax (MTT), Domestic Top-up Tax (DTT), and the GloBE Information Return (GIR) under the Multinational Enterprise (Minimum Tax) Act 2024.