Compare the main withdrawal methods on how steady the income is and how long the money lasts.
If you live off your savings, you have to decide every January how much to withdraw for the coming year. Most people decide by feel. Feel stops working in a year when markets fall sharply, because it pulls you in two opposite directions at once. A withdrawal method settles the question in advance. It is a rule you set once and can apply in about five minutes each year.
There are three main families of withdrawal method. Each one trades income stability against how long the money lasts. To compare them, take Jasmine's drawdown map from lesson 3.4, "Map your drawdown year by year", at the point her CPF LIFE payouts start. She is 65 (an example age) and has about S$1,090,000 in savings, including her SRS. She spends about S$52,900 that year. Her CPF LIFE payout of S$19,200 (also invented) covers part of that spending. Her portfolio has to provide the rest: S$52,900 minus S$19,200, which is about S$33,700.
Her withdrawal rate is the year's withdrawal divided by the portfolio value. For Jasmine that is S$33,700 / S$1,090,000, about 3.1%. Now suppose markets fall 25% in the year after she turns 65 (an invented scenario). After she takes her withdrawal and the fall is applied, her portfolio is worth about S$792,000. Inflation is 2.5% (an example rate). Each method gives her a different withdrawal for the next year.
You set a starting withdrawal and raise it by inflation every year, whatever markets do. The 4% rule is a fixed-amount method. Module 2 of the course "Financial independence: planning the number and the path" covers where it came from and its limits.
The strengths are that your income is perfectly steady, the method is simple and your budget is predictable. This suits essential spending well, which is why the floor in module 2 covers essentials first.
For Jasmine, S$33,700 raised by 2.5% is about S$34,600. The weakness is that the method ignores the portfolio entirely. The same dollars now come out of a smaller pot, so her withdrawal rate rises from 3.1% to about 4.4%. If two or three bad years come early in retirement, a fixed amount keeps withdrawing at the full rate from a shrinking base and can run the money out.
You choose a percentage, and each year you withdraw that share of whatever the portfolio is worth at the time. Because you always take a fraction of what is left, this method can never run the money down to zero. It protects the portfolio but makes your income swing hard.
At 3.1% of S$792,000, Jasmine would take about S$24,600, around 29% less than the year before. Her essential gap (essentials minus CPF LIFE) is about S$16,900 that year, and that gap does not shrink when markets fall. So the whole cut has to come out of her flexible spending, the part of the budget that pays for travel, eating out and gifts. Her flexible spending would fall from about S$18,400 to about S$7,700, a drop of nearly 60% in one year.
A fixed percentage suits people whose guaranteed income covers all their essentials. For them, the swings only ever touch the extras.
Guardrails sit between the other two methods. As in method one, you set a starting withdrawal and raise it for inflation. 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 the planners Jonathan Guyton and William Klinger, but the idea is simple enough that you can set your own numbers.
Setting it up takes three decisions. First, work out your starting withdrawal rate, which for Jasmine is 3.1%. Second, set the upper and lower bands. Jasmine uses 20% either side of 3.1% (chosen for this example), so her upper guardrail is about 3.7% and her lower guardrail is about 2.5%. Third, set the size of each adjustment. Jasmine uses 10% of her flexible spending, and in her version adjustments come only from flexible spending, never from essentials.
Each January after that, you raise the withdrawal for inflation and calculate the new rate. If the rate is above the upper guardrail, you cut by the set amount. If it is below the lower guardrail, you give yourself a raise. If it is between the two, you take the inflation-adjusted amount. You repeat this every year, and cuts continue for as long as a fall persists.
After the fall, the rate on Jasmine's full inflation-adjusted amount is 4.4%, which is above her upper guardrail. She cuts 10% of her flexible spending, about S$1,800, and withdraws about S$32,800 instead of S$34,600. Her new rate is about 4.1%, still above the band, so the rule cuts again next January unless markets have recovered by then.
Guardrails also work upward. If her portfolio had risen 25% instead, her rate would be about 2.6%. That is just above the 2.5% lower guardrail, so she would get no raise yet. A second good year would likely trigger one.
For the same bad year, the three methods give Jasmine about S$34,600 (fixed amount), about S$24,600 (fixed percentage) or about S$32,800 (guardrails).
Which method fits you depends mainly on how much of your spending your floor covers and how much your flexible spending can bend. Start by working out what share of your essentials your guaranteed floor covers. Then work out how much flexible spending you could give up. Match the method to those two answers:
If your guaranteed income covers all your essentials, a fixed percentage on the rest of your spending is workable. If your guaranteed income covers little, a fixed amount gives you a stable budget. To survive bad years it needs a low starting rate and a cash reserve. If your floor covers part of your essentials and you have a decent slice of flexible spending, guardrails let the flexible part absorb bad years without touching the basics.
Jasmine is in the third group, so she chooses guardrails, with cuts falling only on her flexible spending. Lesson 4.4, "Write your withdrawal and refill rules", turns that choice into a one-page rule.
Before the activity, take out your own floor sheet from lesson 2.4. Note what share of your essentials your floor covers and how much flexible spending you could give up in a bad year.
Write down which method fits your floor spending and your flexible spending, and give your reason.
Junxiong-WFG Organisation is an authorised representative of AIA Financial Advisers Private Limited (Reg. No. 201715016G).