Why Your Bonus Looks Like It Was Taxed at 40%

A $10,000 bonus is announced. Around $6,700 arrives. The conclusion is immediate and near-universal: bonuses are taxed at a punitive rate.

They are not. A bonus is taxed exactly like salary — added to your ordinary income and run through the same brackets as every other dollar you earned. What differs is withholding, and withholding is not tax. It is a prepayment against a bill that gets calculated properly later.

If too much was prepaid, the excess comes back. For a lot of people receiving bonuses, too much is prepaid.

A note before you start. This is general education, not tax advice. Federal figures are tax year 2026, from IRS Revenue Procedure 2025-32 and the Social Security Administration. Withholding methods for supplemental wages are set by federal regulation and employers have some discretion between them; your own employer's choice determines what you see. State withholding on supplemental wages varies by state and is not modelled here. Every figure is computed by this site's own tax engine on stated assumptions.

1. Withholding is a prepayment, not a tax

The US income tax system operates on a pay-as-you-go basis. Rather than presenting you with a bill in April, it collects throughout the year and reconciles at the end.

That reconciliation is what a tax return does. It computes your actual liability for the year, compares it against everything already withheld, and settles the difference in one direction or the other.

So there are two entirely separate numbers:

Nothing about a bonus changes the second number's rules. It changes the first.

2. Why a third disappears

Three deductions hit a bonus simultaneously, and together they get close to a third.

Federal withholding at a flat 22%. Bonuses are supplemental wages under federal regulation, and when they are paid separately from regular wages an employer may use the percentage method: withhold a flat 22% federally, with no reference to your W-4, your brackets, or anything else about you.

FICA at 7.65%. Social Security at 6.2% and Medicare at 1.45%, on the full amount — unless you have already passed the Social Security wage base of $184,500 for the year, in which case only the 1.45% applies.

State withholding. Varies by state; many apply their own supplemental rate.

On a $10,000 bonus in a state withholding around 4%:

33.65% withheld. And of that, only the FICA is genuinely final — the other $2,600 is an estimate.

3. What it actually costs you

The real question is what the bonus does to your tax bill, and that depends on your marginal rate — not on 22%.

Take a single filer earning $85,000 with a $10,000 bonus. Their taxable income is $68,900 before the bonus, and the 24% bracket starts at $105,700, so the whole bonus sits in the 22% bracket.

For this person the flat rate happens to be exactly right, because their marginal rate is 22%. That is a coincidence of income level, and it is the case where the system works invisibly.

The over-withheld case

Now someone earning $45,000 with the same $10,000 bonus. Their taxable income is $28,900, which sits in the 12% bracket, and the bonus does not push them past the 22% threshold at $50,400 of taxable income.

That $1,000 comes back as refund. It sat with the Treasury, earning them nothing, for up to sixteen months depending on when the bonus was paid.

The under-withheld case

And someone earning $250,000, whose marginal rate is 32%:

They will owe that at filing. If the shortfall across the year is large enough, an underpayment penalty can apply — which is why higher earners with substantial bonus income should check their withholding rather than assume it is handled.

The pattern is the point: a flat 22% is right for one bracket and wrong for every other. It is a reasonable default, not a personalised calculation.

4. The other method, and why your colleague's bonus looked different

Employers have a choice, and the two methods can produce very different results on the same bonus.

The percentage method applies when the bonus is identified separately from regular wages: flat 22% federal, ignoring your W-4.

The aggregate method applies when the bonus is combined with a regular paycheck. The employer treats the whole combined amount as if it were your normal pay for that period, works out what withholding the tables call for at that annualised rate, subtracts what would have been withheld on the regular wages alone, and withholds the difference.

The aggregate method frequently withholds more, sometimes substantially, because a single large combined paycheck looks — to the tables — like a much higher annual salary than you actually earn.

This is the usual explanation for two colleagues receiving identical bonuses and seeing different net amounts. Neither was taxed differently; their employers used different methods, or one had the bonus combined with a paycheck and the other did not.

Both reconcile identically at filing. Only the timing differs.

5. The million-dollar rule

One threshold is worth naming because it is a genuinely different rule rather than an estimate.

Supplemental wages above $1 million in a calendar year are withheld at the highest federal rate — 37% — on the portion above that threshold. It is mandatory rather than discretionary, and it applies cumulatively across the year.

Below the threshold, the flat rate is a convenience. Above it, the withholding is set at the top marginal rate because someone receiving that much in supplemental wages is very likely to be in it.

6. The refund framing problem

A large refund feels like a windfall. It is the return of your own money, and the framing matters because it changes what you do next.

If you receive a $3,000 refund every year, you have lent the Treasury $250 a month at zero interest. Nothing improper happened — the money was always yours — but you did not have access to it, and the alternative was $250 a month in your account throughout the year.

Adjusting your W-4 moves that money into your paychecks. This is not a tax saving; the annual liability is unchanged. It is a cash-flow change, and it is under your control.

Two reasonable positions:

Prefer the refund. Some people genuinely save better through forced over-withholding than through intention, and a lump sum arriving in spring gets used well. That is a real behavioural argument and it is not irrational.

Prefer the paychecks. Money in your account monthly can fund an emergency fund, retire debt, or earn something in a savings account. At 4% on an average balance, $3,000 spread across a year is worth roughly $60 — small, but positive rather than zero.

The one position that is not defensible is treating the refund as extra income. It is a return of capital, and budgeting as though it were a bonus on top of a bonus double-counts the same money.

7. What you can actually do with a bonus before it is taxed

Two moves genuinely reduce what the bonus costs you, and they are not the same.

Defer it into a traditional 401(k). Many employers allow a separate deferral election on bonus pay. This reduces your taxable income, so it reduces federal and state income tax at your marginal rate. It does not reduce FICA — Social Security and Medicare are charged on gross regardless.

Route it to an HSA, if eligible. An HSA contribution made through payroll under a cafeteria plan reduces taxable income and FICA wages. That makes it strictly better than the 401(k) route on the way in, by 7.65% of whatever you contribute.

Two practical constraints. Bonus deferral elections often have to be made in advance of the bonus being paid — sometimes well in advance — so this is a thing to set up before the announcement rather than after. And annual contribution limits apply to both, so a large bonus may not fit.

What does not work

Asking to receive it next year rarely helps unless you know your next-year income will be materially lower, and constructive receipt rules constrain the timing anyway.

Taking it as a gift card or non-cash award does not avoid tax — most non-cash compensation is taxable at fair market value, and it arrives with the added disadvantage of not being cash.

8. Other income that gets withheld strangely

Bonuses are the commonest case, and the same confusion arrives with several other kinds of pay.

Commissions. Treated as supplemental wages under the same rules, so the same flat 22% percentage method typically applies when they are paid separately. For someone whose income is mostly commission, this can produce persistent over- or under-withholding across a whole year rather than a single event.

Severance. Also supplemental wages, and also commonly withheld at the flat rate. This is the case where over-withholding hurts most: a severance payment usually arrives in a year when your total income will be lower than usual, so a flat 22% is very likely to over-collect on someone who has just lost their income and needs the cash immediately.

Payouts of accrued leave. Same treatment. Often bundled with a final paycheck, in which case the aggregate method may apply and withhold more still.

Overtime. Different — overtime is ordinary wages, not supplemental, so it is withheld under your normal W-4 settings. But because a single large paycheck is annualised by the withholding tables, a heavy overtime week can be withheld as though you earn at that rate all year, producing exactly the same "it was taxed at 40%" impression through a completely different mechanism.

Equity compensation. Vesting restricted stock and similar are generally treated as supplemental wages, with the added complication that the withholding is frequently satisfied by selling a portion of the shares. Whether the flat rate covers your actual liability is worth checking rather than assuming, particularly for anyone whose marginal rate is well above 22%.

The pattern across all of these: withholding rules are built for administrative simplicity across millions of payrolls, not for accuracy on your individual situation. The return is what makes it accurate.

9. When to actually do something about it

Most people should ignore withholding entirely — it approximately works, and the reconciliation handles the rest. Four situations where it is worth attention.

You consistently receive a large refund. Adjusting your W-4 moves that money into your paychecks. Same annual tax, better timing, and it is entirely within your control.

You consistently owe at filing. More urgent, because a large enough shortfall can attract an underpayment penalty. This is common for people with substantial bonus or commission income and a marginal rate above 22%.

Your income changed sharply mid-year. A raise, a job change, a spouse starting or stopping work, or a severance payment all break the assumptions your existing W-4 was set under.

You have significant non-wage income. Investment income, self-employment, or rental income are not withheld against at all, so wage withholding has to cover them or you need estimated payments.

The mechanism in every case is the same: submit a revised W-4 to your employer. It can be done at any time and as often as you like, and the IRS publishes a withholding estimator for working out what to put on it.

10. Where the money should go once it arrives

Having established that the bonus is not being taxed punitively, the practical question is what to do with what lands.

The ordering that follows from everything else on this site:

1. Any employer retirement match you are not capturing. If the bonus can be deferred and doing so captures match you would otherwise miss, that is an immediate return no other use competes with. This is the one that has to be decided in advance, because the deferral election usually closes before the bonus is paid.

2. A starter emergency fund, if you do not have one. A bonus is one of the few moments a fund can move by months rather than weeks. Against $3,400 of monthly essentials, a $6,635 net bonus is nearly two months of runway acquired in a single deposit.

3. High-interest debt. A card balance at 22% costs more than any savings account earns, so retiring it is a guaranteed return equal to the rate. A bonus is unusually well suited to this because it is a lump sum, and lump sums retire balances in a way monthly surpluses take years to.

4. The rest of the emergency fund, then longer-term goals.

The thing to decide before the money arrives

Bonuses are announced in advance and paid later, which creates a window where the money is real enough to plan and not yet available to spend. That window is the best time to make the decision, because a lump sum in a current account behaves very differently from a lump sum with a destination already assigned.

A useful rule, decided in advance and applied every time: a fixed share to the destination above, and a fixed share explicitly to spend. The second half matters — a plan that allocates 100% of every windfall to obligations is one people abandon, and a deliberate 10% or 20% for something enjoyable is what makes the other 80% survive.

Frequently asked questions

Are bonuses taxed at a higher rate than salary? No. A bonus is added to your ordinary income and taxed at exactly the same rates. It is often withheld at a flat 22% federally, which is a prepayment rather than a tax, and it reconciles at filing.

Why did a third of my bonus disappear? Roughly 22% federal withholding, 7.65% FICA, and state withholding on top. Only the FICA is final — the rest is an estimate that gets settled on your return.

Will I get the over-withholding back? Yes, as part of your refund, provided your total withholding for the year exceeded your total liability. If your marginal rate is below 22%, the flat rate over-collects on the bonus.

Why was my colleague's bonus withheld differently? Employers can use the percentage method (flat 22%, bonus paid separately) or the aggregate method (bonus combined with a paycheck and withheld as though that were your normal pay). The aggregate method often withholds more. Both reconcile identically at filing.

Is there a point where the rate genuinely changes? Yes — supplemental wages above $1 million in a calendar year are withheld at 37% on the portion above the threshold. That is mandatory and is a real rule rather than a default.

Can I avoid tax by putting the bonus in my 401(k)? You can defer income tax on it, not FICA — Social Security and Medicare apply regardless. An HSA contribution through payroll reduces both. Bonus deferral elections often must be made before the bonus is paid, and annual limits apply.

Should I adjust my W-4 to stop getting big refunds? It is a cash-flow decision rather than a tax one — your annual liability does not change either way. Money in your paychecks can work for you during the year; a refund is a forced savings mechanism some people genuinely benefit from.

I got a bonus and now owe money in April. Why? Probably a marginal rate above 22%, so the flat withholding under-collected. If the shortfall is large, an underpayment penalty can apply, and adjusting withholding is a better remedy than saving up for the bill.

Is a signing bonus treated differently? No — it is supplemental wages like any other bonus, withheld the same way and taxed as ordinary income at filing. The complication with signing bonuses is the clawback: many carry a repayment obligation if you leave within a stated period, and repaying a bonus in a later year than you received it creates a genuinely awkward tax situation worth getting advice on before you sign.

Does a bonus affect my Social Security wage base? Yes. Bonus pay counts toward the $184,500 contribution and benefit base like any other wages, so a large bonus can push you past it earlier in the year — after which Social Security stops being withheld and your regular paychecks get bigger. Medicare continues regardless, because it has no cap.

What to do next

The useful comparison is your real marginal rate against the 22% flat withholding rate — that difference is what comes back or what you will owe.

• Take-home pay calculator — your marginal and effective rates, and every deduction separated.
• Marginal vs. Effective Tax Rate — the two rates, and why confusing them causes most tax confusion.
• Your Paycheck in the USA in 2026 — the full federal and state picture.
• Emergency fund calculator — a common and sensible destination for a bonus.
• 50/30/20 budget calculator — where to put it once it arrives.

Every figure on this site is sourced and dated. How we source every number.

Figures in this article are illustrations computed by this site's own tax engine for tax year 2026, on single filers taking the standard deduction. Federal figures come from IRS Revenue Procedure 2025-32 and the Social Security Administration. Supplemental-wage withholding methods are set by federal regulation and employers have discretion between them; state supplemental withholding varies and is not modelled. This is general education and not tax advice; for your own situation consult a licensed tax professional.