Let's break down what S$100,000 can realistically deliver, and how you can grow that income stream over time. How Much Passive Income Can S$100,000 Really Produce? The maths is very simple: capital x portfolio's yield = passive incomeLet's say your portfolio has a 3% yield. Where Could That Passive Income Come From? Singapore REITsReal estate investment trusts (REITs) in Singapore must distribute at least 90% of taxable income, and their payouts are backed by predictable rental cash flows.