Key takeaway: After a large bonus or commission, calculate both the payments needed on time to avoid an estimated-tax penalty and the cash needed for the final tax bill. Those amounts can differ substantially. Update the projection before the next installment deadline and confirm any payroll adjustment on the actual paystub.
For the wider picture, see year-round tax planning with a Fort Lauderdale tax advisor.
A bonus check can have substantial tax withheld and still leave a balance due. It can also be adequately covered by other withholding, estimated payments or credits. The useful comparison is your projected annual tax against all payments credited toward that tax, with attention to when each payment counts.
This guide covers ordinary federal individual estimated-tax planning for calendar-year U.S. citizens and residents receiving employee bonuses or commissions. Nonresident, farming and fishing, and other special rules need separate review. A self-employed salesperson’s commission is business income rather than employee supplemental wages; the payroll discussion below assumes an employment relationship.
Read the paystub before assuming a shortfall
For 2026, an employer may use the optional 22% federal supplemental withholding rate on separately identified bonuses or commissions within the applicable limit if it withheld federal income tax from regular wages in the current or immediately preceding calendar year. Otherwise the aggregate method may be required. Supplemental pay combined with regular pay without identifying each amount is treated as one regular payroll payment.
The $1 million threshold is cumulative annual supplemental wages, including payments from businesses under common control. The excess is subject to 37% withholding. A Form W-4 does not change a separately applied flat supplemental rate; it can affect regular-pay or aggregate-method withholding. These are employer withholding rules, not special final income-tax brackets for bonuses. See IRS Publication 15, section 7.
Ask payroll which method it used, then distinguish federal income tax withholding from Social Security, Medicare, state deductions and benefit deductions. The entire difference between gross pay and take-home pay is not a federal income-tax prepayment. Investigate an incorrect gross amount or deduction as a possible payroll error before building a projection around it.
Set the payment target and the final-tax reserve separately
Under the ordinary 2026 rules, estimated payments generally are needed if you expect to owe at least $1,000 after withholding and refundable credits and those amounts will be below the smaller of:
- 90% of 2026 tax; or
- 100% of 2025 tax, increased to 110% if 2025 adjusted gross income exceeded $150,000, or $75,000 when filing married filing separately for 2026.
The prior-year comparison requires a filed return covering 12 months. Use the tax calculation specified by the instructions, rather than last year’s refund or balance due. See the 2026 Form 1040-ES instructions and worksheet.
A separate exception applies if you had no tax liability for the preceding full 12-month tax year and were a U.S. citizen or resident throughout that year. Special rules and possible waivers also exist for qualifying circumstances; a disappointing bonus or a general expectation of a refund is not itself a waiver. The governing rules are in Internal Revenue Code section 6654.
These payment targets address estimated-tax penalties. They do not cap your final tax liability. If income rises sharply, the prior-year target may be much less than the current-year tax. Keep the expected filing balance in your cash plan even when timely payments satisfy that target.
Use the payment periods, not calendar-quarter meeting dates
The ordinary calendar-year 2026 installment deadlines are:
| Installment | Payment deadline | Cumulative income period for annualization |
|---|---|---|
| First | April 15, 2026 | January 1–March 31 |
| Second | June 15, 2026 | January 1–May 31 |
| Third | September 15, 2026 | January 1–August 31 |
| Fourth | January 15, 2027 | January 1–December 31 |
Deadlines come from 2026 Form 1040-ES; the cumulative income periods come from Publication 505, Worksheet 2-9. Applicable disaster relief can change a taxpayer’s dates. Waiting until June 30 or September 30 to review a payment due earlier that month is too late.
For uneven compensation, the annualized income installment method can reduce an earlier required installment based on income, deductions and other items actually attributable to the cumulative period. It is a calculation, not permission to put all tax on a late bonus into any convenient installment. Use Publication 505’s worksheet and file Form 2210 with Schedule AI when using this method. Retain dated records supporting the allocation.
Compare extra withholding with an estimated payment
Federal withholding is generally treated as paid in equal portions on the installment due dates, unless you elect treatment using the actual withholding dates. That can make additional withholding from remaining wages useful late in the year. Confirm there are enough wages and processing time for payroll to implement the change; an unprocessed W-4 request is not a payment. See Publication 505’s withholding allocation rules.
Estimated payments are credited by payment date. A late payment generally stops further accrual on the amount it covers but does not erase the penalty for an earlier unpaid period. A return can show a refund and still have an earlier installment penalty. The Form 2210 instructions explain the separate installment calculation and application of payments to earlier shortfalls.
Keep the last payroll opportunity separate from the January fourth-installment deadline. Additional 2026 wage withholding must occur through 2026 wages; a January estimated payment designated for 2026 follows different timing rules. Some return-related choices remain available after year-end, but they do not reopen a missed payroll processing window.
We cover Payroll Bonuses and Commissions in a companion article, “Payroll Bonuses and Commissions: Preventing Withholding Surprises.”
Worked example: a safe-harbor target does not pay the entire bill
Assume a calendar-year employee has a filed 12-month 2025 return, 2025 AGI of $200,000 and prior-year tax of $30,000 under the applicable worksheet. A large bonus increases projected 2026 tax to $50,000. Expected full-year federal income tax withholding, including the bonus, is $25,000. There are no other credits or special adjustments in this illustration, and withholding is allocated equally. The employee uses the ordinary installment method and already paid $2,000 by April 15 and $2,000 by June 15.
| Calculation | Amount |
|---|---|
| 90% of projected current-year tax: $50,000 × 90% | $45,000 |
| Prior-year target: $30,000 × 110% | $33,000 |
| Smaller annual target | $33,000 |
| Target less projected withholding: $33,000 − $25,000 | $8,000 estimated payments |
| Each of four equal installments: $8,000 ÷ 4 | $2,000 |
| Next payment, September 15, with earlier installments paid timely | $2,000 |
| Fourth payment, January 15, 2027 | $2,000 |
| Projected filing balance: $50,000 − $25,000 − $8,000 | $17,000 |
After the two $2,000 payments already made, the employee needs $21,000 of additional cash beyond future payroll withholding: $4,000 for the two remaining installments plus $17,000 for the projected filing balance. If only $18,000 has been reserved, the cash-plan gap is $3,000. The $25,000 withholding forecast already includes future payroll deductions; subtracting those deductions again would understate the reserve.
This is an illustrative application of the rules, not a computed return for a particular income level. Changes in income, credits, withholding or payment timing require recalculation. The prior-year target in this example protects against an estimated-tax penalty only if the relevant installments and assumptions are satisfied.
Make the next action specific
Prepare one dated worksheet with the prior-year target, current-year tax forecast, actual payments, expected remaining withholding, next installment, and remaining cash reserve. Separate known compensation from uncertain commissions and model the latter at more than one amount. Include other household income and relevant state obligations rather than treating a bonus as the entire tax picture.
The IRS Tax Withholding Estimator can help eligible wage earners evaluate a W-4 adjustment using current pay records and other income information. It is not a substitute for checking each estimated-payment deadline or a complex business-owner projection.
Assign responsibility: the advisor documents the calculation, the employee submits any W-4 change or estimated payment, and the employee checks the resulting paystub or payment confirmation. For owner-employees, keep the employer’s payroll obligations and the owner’s individual estimates separate. A business distribution should not automatically be treated as wages or as the measure of taxable business profit.
For help with a variable-compensation projection, contact CPA Firm South Florida with the next payment and payroll deadlines. Confirm the deliverable, fee and responsibility for implementation in the engagement. Tax-return preparation can include related advice within its scope; ongoing projections, payroll work and IRS representation require the scope appropriate to the services requested.
Frequently asked questions
Does 22% bonus withholding mean my bonus is taxed at 22%?
No. A withholding rate determines a prepayment. Your annual tax calculation includes taxable income, deductions, credits and any applicable additional taxes. Compare the full-year tax with all credited payments, rather than judging one paycheck by your highest tax bracket.
Can a December estimated payment erase an earlier underpayment?
Usually it cannot erase the penalty for days an earlier installment was unpaid. Federal withholding is generally allocated equally among installment dates unless actual-date treatment is elected. Compare the two methods using the full payment history before choosing a year-end adjustment.
Do I need estimated payments if I expect a balance due?
A balance due alone does not establish an estimated-tax penalty. Check the $1,000 test, the applicable current-year or prior-year payment target, and whether each installment was paid on time. Also reserve cash for any tax still due with the return.
What should I send a CPA after a large commission?
Send the actual paystub, year-to-date compensation and federal income tax withholding, dated estimated-payment confirmations, the prior-year return, and a forecast of remaining household income, deductions and credits. Identify uncertain amounts and the next payroll processing deadline.