Irregular expenses can turn a comfortable-looking monthly budget into a yearly shortfall. If your savings keep falling even though income covers the usual bills, add the less frequent costs before deciding what is left over. Then choose how to cover the gap: set money aside, adjust spending, plan withdrawals, or make a repeatable change to income and costs.
This article reworks Money & Why’s published Korean case about a retired couple’s annual budget. It keeps the general money-management ideas, not national pension or tax rules. The household is fictional, and all amounts below are illustrative money units rather than converted currency. Reviewed September 9, 2026.
A monthly surplus and a yearly shortfall can both be real
Suppose a retired couple receives 2,300 a month after deductions and spends 2,100 on regular living costs. They appear to have 200 left over. Yet their savings are smaller at the end of the year.
The missing costs were home repairs of 1,800, transport costs of 1,200, gifts and family events of 1,200, and planned medical or dental costs of 1,800. None were included in the regular monthly figure. Together, they total 6,000.
The monthly surplus adds up to 2,400 over a year. Subtract that from the extra 6,000 and the gap is 3,600. If the couple took that amount from savings, the falling balance is no longer a mystery. Their plan left out spending that actually happened.
This does not mean next year’s extra costs must also be 6,000. A major repair may not repeat. Other costs may be new. Split the list into regular annual bills, replacements needed every few years, and genuinely unexpected events. Use the past to find omissions, not to copy every amount blindly.
The CFPB’s spending assessment guide recommends checking actual records and including less frequent expenses. Its wider page is about home buying; the point used here is simply to build a realistic spending picture, not to apply its local mortgage rules.
Four ways to handle irregular expenses
1. Turn expected bills into a monthly savings amount
This works when you can reasonably estimate a cost and its timing. If the coming year’s expected extras really are 6,000, a full-year plan needs 500 a month. Add that to regular spending of 2,100 and the household needs 2,600, which is 300 more than monthly income.
Your action: review 12 to 24 months of records, then build a list for the coming year. Give each item an expected amount, payment date and amount already saved. Calculate what still needs to be set aside before the bill arrives.
Check next: did last year include a one-off repair, and is a new replacement approaching? A bill due soon may require more than its annual monthly average. If some of the money is already in a separate pot, subtract it before calculating the remaining gap.
The limit: a new savings account does not create extra income. It makes the shortfall visible. In this case, the 300 monthly gap still needs a decision. Do not count a transfer to the bill pot as spending and then count the full payment again when measuring the same year’s total costs.
2. Set a spending order, not a ban on everything
This fits a household with some room to adjust planned costs. Label items as essential, adjustable or genuinely deferrable. That is more useful than promising to stop every large expense.
Your action: agree on annual limits for flexible items such as travel or gifts. Track what remains. For repair work, compare the scope and quotes rather than choosing only by the lowest headline price. A cheaper quote may leave out necessary work.
Check next: would postponement create a safety problem or a larger bill later? Is family support a one-off gift or becoming a regular commitment? Decisions about whether and when to seek treatment belong with qualified healthcare professionals, not a budgeting rule.
The trade-off is that changes can affect relationships and enjoyment. A plan that quietly asks one person to give up everything is unlikely to last. Make the choices together and name what you want to protect.
3. Put planned withdrawals on the page
This fits someone who saved money partly to use in retirement. Spending some savings is not automatically a mistake. The concern is drawing down money without knowing the pace or what other jobs that money must do.
Your action: separate assets available for ordinary spending from money reserved for housing, healthcare or other commitments. If the annual gap is 3,600, examine what five or ten years of withdrawals would mean. At a flat 3,600 a year, the withdrawals total 18,000 over five years and 36,000 over ten, before returns, fees, taxes or changing costs.
Those totals are arithmetic, not a safe-withdrawal recommendation. A longer retirement, higher prices or new care needs can change the picture. Also consider what happens to income if one partner dies. Do not assume the surviving partner receives exactly the same household income.
Check next: the account’s withdrawal conditions, any fees or local taxes, and whether selling investments could realise a loss. Check the rules where you live and the terms of your own accounts. There is no single withdrawal percentage in this article that makes every household safe.
The limit is uncertainty. A flat-cost calculation is only a starting comparison. Repeat it with higher expenses and lower income before relying on it for a long-term decision.
4. Close a recurring gap with a recurring change
This fits a household whose available savings cannot comfortably carry the shortfall. Look for changes that can repeat, rather than hoping for a windfall every year.
In the example, reducing spending by 150 a month and bringing in another 150 after costs would cover the 300 monthly gap. Over 12 months, that totals 3,600. Both changes have to happen for the arithmetic to work.
Your action: choose one realistic cost change and one possible source of extra income. Subtract travel, materials and other related costs from the income estimate. Record the actual net result for three months before treating it as dependable.
Check next: health, time, contract length and the effect of extra work on any payments you receive under local rules. If moving home is part of the plan, include transaction and moving costs. A lower regular bill can still come with a large upfront expense.
The trade-off is effort and uncertainty. Future rent or part-time income is not guaranteed. A plan that relies on working beyond what health allows is fragile. Adjust the spending plan if the income does not arrive.
Common questions
Should I divide every large bill by 12?
Not automatically. That works for a full-year estimate, but the next payment date matters. If a bill arrives in three months, calculate the amount still needed over those three months. Also avoid treating a rare replacement as a cost that repeats every year.
Is using savings a sign that retirement is going badly?
Not by itself. The useful question is whether the withdrawals fit a plan that includes future needs. An unexplained drop in savings deserves investigation; an understood, affordable withdrawal has a different meaning.
Could a high-return investment cover the gap instead?
Do not treat an advertised or hoped-for return as dependable bill money. Investment values can fall and returns may not arrive when payment is due. A budgeting gap does not become harmless because a product offers an attractive yield.
Start with last year’s large payments
Before cutting everyday spending, write down the large amounts you took from savings in the past year. Decide which are likely to return, what new costs are approaching and when the money will be needed. Then compare the four options together. You may need a combination, not one dramatic change.
For related reading, see planning a home repair budget and building a cash cushion without raiding it each month. Both separate the job of the money from its current account balance. This article is general education, not individual financial, tax or medical advice.