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Two lump sums land in roughly the same season and get treated identically by most people, and they shouldn't be. One is money you earned and haven't been taxed on properly yet. The other is money you already earned, already paid tax on, and lent to the government for free.
Knowing which one you're holding changes how you should handle it.
A refund is your own money coming back
If you get a $2,400 refund, that's not a gift. It's $2,400 ÷ 12 = $200 a month that you earned during the year, had withheld, and lived without.
Reframing it this way helps you decide what to do with it. You didn't just find $2,400 in April. You made twelve monthly payments of $200 into an account that paid no interest and wouldn't let you make a withdrawal.
Many people prefer it that way — a forced savings account you can't raid is valuable if the alternative is the money disappearing into daily spending. But it should be a choice you make, not something that happens to you by accident.
If you'd rather have that $200 a month, that's a W-4 change with your employer, not a tax strategy. Adjusting your withholding moves the money from April back into your regular paychecks. The trade: bigger monthly paychecks, no spring lump sum, and a slightly smaller margin for error if your tax situation changes mid-year.
A bonus is a different animal
A bonus is money you haven't paid tax on yet, and the withholding on it often catches people off guard.
Employers usually withhold federal tax on a bonus at a flat 22% supplemental rate rather than your usual paycheck rate. Add FICA at 7.65%, plus state tax, and a $3,000 bonus looks like this:
- Bonus: $3,000
- Federal withholding (22%): −$660
- FICA (7.65%): −$229.50
- Take-home: about $2,110 before state tax
That's roughly 70% of the number you were told. And the part that matters: 22% is a withholding rate, not your tax rate. It's an estimate. If your actual tax bracket is lower, you'll get some of that back at tax time. If it's higher, you'll owe. Either way, the number you can actually spend is the number that hit your account.
The practical rule: Never plan a bonus at its announced size. Multiply the offer by 0.7 and plan for that. If more arrives, it's a win.
Splitting it? Two numbers, no account, nothing saved or sent anywhere.
Split my lump sumSo what do you do with it?
The general strategy for lump sums is covered in what to do with the third paycheck this month — cushion first, then debt, then getting ahead, then split it.
The difference here is how you apply that logic to these two specific types:
A refund arrives on a schedule you know. This makes it the best candidate for a goal that needs one big deposit rather than a monthly trickle — the buffer that gets you one paycheck ahead, a security deposit, or the deductible you've been dreading. You can plan for a refund a year in advance.
A bonus is usually larger and less certain. Don't commit it to a recurring monthly expense. A bonus that funds a car payment is a bonus that has to arrive every year at the same size, and that's not a promise anyone made you.
Both are outside your monthly plan, so putting them into savings doesn't cost you anything in your daily life. Your budget works without them. That makes them structurally different from a raise, which requires you to adjust your monthly habits.
The one case for spending some of it
Take some. Seriously.
If every cent of a bonus or refund vanishes into debt and savings, the plan can start to feel like a machine that eats every good thing that happens to you. That's how people stop following the plan. The five-way split includes a fun money slice for exactly this reason.
On a $2,110 bonus, the standard split gives you $1,161 for essentials, $106 for fun, $211 for debt/investing, $317 for short-term savings, and $317 for long-term investing.
Because your essentials are covered by your regular paychecks, that $1,161 is free to move. You could move it all to your debt or savings, or you could keep the fun money slice and move the rest. Or, you could take 10% off the top and spend it without a spreadsheet, then split the rest.
It's not a rule; it's permission.
What not to do
Don't let it sit in your checking account. A lump sum in a spending account has a short shelf life. It doesn't get spent on anything memorable; it just inflates the number you see when you check your balance, and every decision for the next month gets made against that inflated figure. Move it the day it lands.
Don't pre-spend it. This is the trap of the third paycheck, but worse because the lead time is longer. You know in November what's coming in March. Don't make four months of decisions based on money that hasn't arrived yet.
Don't treat the refund as free money every year. If you get a substantial refund every year, that's a standing choice you're making by default. It's worth looking at once to decide if you'd rather have that money in your paycheck every month.
Before it lands
If it's a bonus: Multiply the announced amount by 0.7 and write that down. That's your planning number.
If it's a refund: Divide it by 12. That's what you've been living without every month. Decide if you want it in your paychecks instead.
Then, run the real number through the budget calculator if you're splitting it, or move it into a separate account today if you aren't.
This is a general guideline for organizing your own money, not financial advice.