You will be able to compare the main withdrawal methods on income stability and how long the money lasts.
Every retiree living off savings answers the same question each January: how much do I take out this year? Most people answer it by feel, which works until the year markets fall by a quarter and feel says two opposite things at once. A withdrawal method answers it in advance, with a rule you can apply in five minutes.
There are three main families of method. Each one trades income stability against how long the money lasts. This lesson compares them using Jasmine's drawdown map from lesson 3.4, Map your drawdown year by year, at the point CPF LIFE starts.
At 65, Jasmine's savings total about S$1,090,000 in this example. Her spending that year is about S$52,900, and her invented CPF LIFE payout covers S$19,200 of it. So her portfolio, which here includes her SRS, has to provide about S$33,700.
Her withdrawal rate is that withdrawal divided by the portfolio: S$33,700 divided by S$1,090,000, about 3.1%.
Now suppose her portfolio falls 25% in the year after she turns 65. Taking her withdrawal out and applying the fall leaves about S$792,000. What should she take the next year? Each method gives a different answer.
The fixed-amount method sets a starting withdrawal and raises it by inflation every year, whatever markets do. This is how the 4% rule is framed, and Financial independence: planning the number and the path, module 2, covers where that rule came from and its limits.
Under this method Jasmine simply raises her S$33,700 by 2.5%, to about S$34,600, and takes it. Her income is perfectly steady. Her withdrawal rate, though, has jumped from 3.1% to about 4.4%, because the same dollars are coming out of a much smaller pot.
That is the method's weakness. It ignores the portfolio entirely. If two or three bad years come early, it keeps withdrawing at full rate from a shrinking base and can run the money out. Its strength is simplicity and a predictable budget, which suits essential spending well. That is why the floor in module 2 covers essentials first.
The fixed-percentage method takes the same share of whatever the portfolio is worth each year. It can never run the money to zero, because you always take a fraction of what is left.
If Jasmine took 3.1% of her S$792,000, she would get about S$24,600, around 29% less than the year before.
The cut lands somewhere specific. Her essential gap that year, essentials minus CPF LIFE, is about S$16,900, and it doesn't shrink because markets fell. So the whole cut comes out of her flexible spending, which would fall from about S$18,400 to about S$7,700. That's a drop of nearly 60% in the part of her budget that pays for travel, eating out and gifts, in a single year.
So a fixed percentage protects the portfolio and makes income swing hard. It suits people whose guaranteed income covers all their essentials, so that the swings only ever touch the extras.
Guardrail methods sit between the two. You set a starting withdrawal and raise it for inflation, like method one, but you also set bands around your withdrawal rate. When the rate crosses the upper band, you cut spending by a set amount. When it falls below the lower band, you give yourself a raise. The best-known version comes from planners Jonathan Guyton and William Klinger, but the idea is simple enough to set your own numbers.
Jasmine's bands, chosen for this example, sit 20% either side of her starting rate of 3.1%. The upper guardrail is about 3.7% and the lower about 2.5%. Each adjustment is 10% of her flexible spending, never her essentials.
After the 25% fall, her rate on the full inflation-adjusted amount would be 4.4%, above the upper guardrail. So she cuts 10% of her flexible spending, about S$1,800. Her withdrawal becomes about S$32,800 instead of S$34,600. Her rate is still around 4.1%, above the band, so if markets don't recover by next January the rule cuts again.
Compare the three answers to the same bad year. The fixed amount takes about S$34,600 and ignores the risk. The fixed percentage takes about S$24,600 and guts her flexible spending. The guardrail takes about S$32,800 and trims a little, with more cuts to follow only if the fall persists.
Guardrails work the other way too. If her portfolio had risen 25% instead, her rate would have dropped to about 2.6%, just above the lower guardrail, so no raise yet. A second good year would likely trigger one.
The choice depends mainly on how much of your spending the floor covers and how much your flexible spending can bend.
If guaranteed income covers all your essentials, a fixed percentage on the rest is workable, because the swings only touch extras. If it covers little, a fixed amount gives you a stable budget but needs a low starting rate and a cash reserve to survive bad years. If, like Jasmine, your floor covers part of your essentials and you have a decent slice of flexible spending, guardrails let the flexible part absorb the bad years without touching the basics.
Jasmine chose guardrails, with cuts that fall only on flexible spending. Lesson 4.4, Write your withdrawal and refill rules, turns her choice into a one-page rule.
Before the activity, look at your own floor sheet from lesson 2.4. Note what share of your essentials the floor covers and how much flexible spending you could give up in a bad year.
Write which method suits your floor and flexible spending, and why.
Junxiong-WFG Organisation is an authorised representative of AIA Financial Advisers Private Limited (Reg. No. 201715016G).