Windfall.
In plain English
A windfall is a large sum that arrives outside regular income, from an inheritance, a legal settlement, a bonus, a sale, or a payout that was never part of the monthly plan. Because it feels different from earned pay, mental accounting tends to route it toward spending that a paycheck would never fund. Two things usually get missed in the first month: the tax treatment, which varies enormously by source and can leave a bill due much later, and the fact that the sum is finite and will not repeat. A holding period, parking the money somewhere boring while the tax picture and the options get sorted, costs almost nothing and prevents most of the damage.
01Why it matters
The tax owed on a windfall can arrive long after the money is spent, so the amount that is actually available is often smaller than the amount that landed.
02The math, step by step
Say a 50,000 dollar bonus arrives and roughly 30 percent goes to withholding, leaving about 35,000 dollars. If a person plans against the 50,000 dollar figure, the plan is short by 15,000 dollars before it starts.
Illustrative example. The amounts here are hypothetical, chosen to show how the math works, not real quoted rates or figures.
03What this is NOT
It is not a raise. A raise repeats every period and can support an ongoing commitment such as a larger rent. A windfall happens once. Using it to fund a recurring cost creates an obligation that outlives the money that started it.
04Receipts
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Plain-English answers from our glossary. Receipts included. Never advice.
Educational tool. Answers come only from ClearMoneySchool's published glossary and are not advice. Why we never give advice