Your retirement budget is $60,000 a year. You expect $36,000 from dependable outside income, leaving your portfolio to supply $24,000. Then your investments fall in the first spending year.
Do you raise next year's transfer for inflation, hold it steady, or cut it?
Early losses leave fewer assets to fund later spending, the problem behind sequence risk. A withdrawal rule has to fit two things: the investments left and the life they pay for.
Find the gap the portfolio must fill
Your portfolio spending gap is the part of your budget that dependable income from outside the portfolio does not cover.
For the year you plan to retire, suppose you have:
- Accessible investments: $600,000, including $24,000 held in cash.
- Annual budget: $60,000, split into $42,000 for essentials, including a tax allowance, and $18,000 for discretionary spending such as travel and dining out.
- Outside income: $36,000 a year before tax, beginning when retirement starts.
Amounts are in US dollars, and investment returns are before fees.
$60,000 − $36,000 = $24,000 a year, or $2,000 a month. Your initial withdrawal rate is the first withdrawal divided by starting investments: $24,000 ÷ $600,000 = 4%.
A pension or Social Security can supply outside income in a US plan. Check eligibility, payment dates and amounts before counting it. Income that starts later cannot pay earlier bills.
Withdrawals are gross dollars leaving the portfolio, before tax. Dividends and interest count toward them; sales can supply the rest. These payments already belong to total return, so counting them as outside income too counts the same dollars twice. A dividend-only plan still faces market losses and bills it may not cover.
What the 4% guideline means
The 4% guideline takes 4% of the initial portfolio for the first year's withdrawal, then adjusts that dollar amount for inflation. This is a fixed real withdrawal: the dollars change to keep purchasing power steady.
Say inflation is 2%: $24,000 × 1.02 = $24,480 next year. The 4% sets the starting dollars; it is not applied to each new balance.
Taxes and fees leave less for spending. The withdrawal has to cover any tax due as well as groceries.
Choose what changes after a loss
These spending approaches differ in how much they ask your budget to change after a loss:
| Rule | Based on | After a loss | Trade-off |
|---|---|---|---|
| Dollars + inflation | First withdrawal | Keep inflation raise | Larger share spent |
| Fixed percentage | Latest balance | Fewer dollars | Variable spending |
| Conditional cut | Budget | Trim agreed extras | Give up purchases |
With fixed real withdrawals, the same lifestyle can consume a growing share of a shrinking portfolio. A percentage-of-portfolio withdrawal takes a fixed share of current investments. It shrinks after losses, whether or not your bills do.
A spending adjustment rule specifies when to review, what triggers a change and which purchases can go. Calling spending “discretionary” does not make it painless to cut. Flexibility has to exist in the budget before it can help the portfolio.
Work through a bad first year
Suppose your whole portfolio, including cash, returns −16% in year one. To keep the arithmetic simple, take the $24,000 out at year-end, after that total return. Monthly amounts here are budget equivalents.
$600,000 × 0.84 − $24,000 = $480,000 remaining.
Of the $120,000 balance decline, $96,000 is an investment loss and $24,000 paid your bills.
For year two, use that 2% rise for all spending and outside income. The budget becomes $61,200: $42,840 for essentials and $18,360 for discretionary spending. Income becomes $36,720.
The gap is $61,200 − $36,720 = $24,480, now 5.1% of the remaining $480,000. Matching income to inflation matters: if income stays flat, the gap grows faster.
Taking 4% of that balance instead pays $19,200. It leaves $5,280 of planned spending unfunded.
Suppose you chose this rule before the loss: at the December 31 review, cut next year's planned extras by $200 a month after a year of investment losses. The cut goes ahead only if essential bills stay covered and you can live with the smaller budget.
That means $200 × 12 = $2,400 less spending. Discretionary spending falls to $15,960, bringing the budget to $58,800. The new withdrawal is $58,800 − $36,720 = $22,080, or 4.6% of the remaining portfolio.
The smallest bar asks for the biggest spending change.
The year-two decision is $22,080 if the cut works and the income, tax and access assumptions hold. You keep $2,400 invested by giving up $2,400 of purchases, before any further returns. If the cut will not work, the cash plan needs changing; more investment risk will not shrink the bills.
Give near-term cash a refill rule
Here, the reserve from the sequence-risk lesson becomes a cash bucket for the next year's withdrawals, held inside the portfolio.
The example uses one year's withdrawals as its buffer. The initial $24,000 earns nothing and pays the first year-end withdrawal, leaving it empty. The $480,000 remainder is already after that spending.
Setting aside $22,080 for year two moves money from remaining investments into cash within that same $480,000, before transaction costs. Moving money between pockets does not make you richer.
Retained investment income and planned rebalancing proceeds can replenish it. If those fall short, refilling the bucket can still require sales after losses, with taxes and costs. A reserve needs a refill rule because bills can outlast it.
This retirement withdrawal plan has five parts that fit into an investment policy statement:
- Annual gap: $22,080 for year two with the agreed spending cut.
- Payment rule: Gross dollars, modeled at year-end; actual transfers follow bill dates.
- Bad-year change: $200 less per month in extras after a negative year, if feasible. Reassess each December 31; restoring spending needs a fresh budget review too.
- Cash and refills: One year's planned withdrawals; check cash against upcoming payments each quarter-end and before a large known bill.
- Reasons to revise: Changed income, essential costs, taxes, account access or an unaffordable cut.
For a US plan, check account access and the relevant tax treatment before moving money.
With the spending plan in place, the Sharpe ratio offers an optional way to compare investment performance. It cannot tell you whether a withdrawal is affordable.
In short
- Your budget sets the gap your portfolio must fill after outside income.
- The 4% guideline sets starting dollars, then adjusts them for inflation; it does not guarantee 30 years.
- A smaller withdrawal needs a real spending change or another funding source.
- Keep the cash reserve inside the portfolio total and give it a refill rule.