A Singaporean couple can retire comfortably with S$2100 pm in Malaysia. So, if they have passive income of S$3000 pm, then they can retire. They can rent out their HDB flat for S$3000 pm. If they retire at 65, they will get an additional S$2400 pm from the CPF Life, so their passive income at 65 is S$5400 pm. This is more than enough to retire in Malaysia. They can move from one city to another during their retirement. For example, 2 years in KL, 2 years in Malacca, 2 years in Penang, 2 years in KK, 2 years in Chiang Mai, 2 years in Krabi, 2 years in Phuket, 2 years in Koh Samui, etc. Just avoid JB.