To increase your federal tax withholding, submit a revised withholding form to whoever pays you and tell them to take more out. For wages, that means writing an extra per-paycheck dollar amount on Line 4(c) of IRS Form W-4 and giving it to your employer. Pensions use Form W-4P, one-time retirement withdrawals use Form W-4R, Social Security and unemployment use Form W-4V, and third-party sick pay uses Form W-4S. The form goes to the payer, never to the IRS.
Getting the amount right matters because federal income tax is pay-as-you-go: you owe it as you earn, not in a single April payment.1Internal Revenue Service. Pay as You Go, So You Won’t Owe: A Guide to Withholding, Estimated Taxes and Ways to Avoid the Estimated Tax Penalty To avoid an underpayment penalty, your total withholding and estimated payments during the year need to reach at least the smaller of 90 percent of your current-year tax or 100 percent of what you owed last year.2Office of the Law Revision Counsel. 26 USC 6654 – Failure by Individual to Pay Estimated Income Tax If your adjusted gross income last year was more than $150,000 ($75,000 if married filing separately), that 100 percent threshold rises to 110 percent.3Internal Revenue Service. Underpayment of Estimated Tax by Individuals Penalty Aim to clear one of those bars and you’re safe from the penalty.
Figure Out How Much Extra to Withhold
Before you change anything, pull together your most recent pay stubs for every job in the household, last year’s federal return, and a realistic estimate of income that doesn’t have withholding attached to it, such as freelance work, investment gains, rental income, or an expected bonus.
Then run the numbers through the IRS Tax Withholding Estimator at irs.gov. You enter filing status, dependents, income sources, and anticipated deductions, and it tells you how much additional withholding per paycheck would put you on track. It can also generate a pre-filled Form W-4 or W-4P you print and hand to your employer or plan administrator.4Internal Revenue Service. Tax Withholding Estimator
Wages: Form W-4, Line 4(c)
Form W-4, the Employee’s Withholding Certificate, controls how much federal tax your employer takes from each paycheck.5Internal Revenue Service. Form W-4, Employee’s Withholding Certificate Download it from irs.gov, request it from HR, or update it through your employer’s payroll portal if one is available.
The direct route to more withholding is Step 4, Line 4(c), labeled “Extra withholding.” Write a flat dollar amount on that line and your employer will deduct it from every paycheck on top of the standard withholding calculated from your filing status and income.5Internal Revenue Service. Form W-4, Employee’s Withholding Certificate The number you enter is the per-paycheck amount, not an annual total. If the estimator says you need $2,400 more withheld for the year and you’re paid biweekly across 26 pay periods, put $92 on Line 4(c).
You can submit a new W-4 as many times as you want during the year. A raise, a second job, or a spouse starting work is a good reason to revisit it, and the IRS recommends completing a new W-4 every year and any time your financial situation shifts.6Internal Revenue Service. About Form W-4, Employee’s Withholding Certificate
Bonuses and Supplemental Pay
Bonuses, commissions, and other supplemental wages are usually withheld at a flat 22 percent regardless of what your regular W-4 says, and supplemental wages over $1 million in a year are withheld at 37 percent. If 22 percent falls short of your actual bracket, the extra amount on Line 4(c) helps close the gap, because it comes out of every paycheck including the one carrying the bonus.
Pensions and Retirement Distributions
Retirement income uses different forms depending on whether payments are recurring or one-time.
Regular Pension or Annuity Payments: Form W-4P
If you receive periodic pension, annuity, profit-sharing, or IRA payments, Form W-4P is what you file. It works much like the W-4, and Step 4(c) lets you request a specific extra dollar amount withheld from each payment.7Internal Revenue Service. 2026 Form W-4P – Withholding Certificate for Periodic Pension or Annuity Payments Send it to your plan administrator or pension provider.
Lump Sums and Rollovers: Form W-4R
One-time withdrawals, IRA distributions payable on demand, and other nonperiodic payments use Form W-4R. The default withholding on nonperiodic payments is 10 percent, but you can pick any rate from 0 to 100 percent. For eligible rollover distributions the default is 20 percent, and that’s the floor. You can go higher but not lower.8Internal Revenue Service. 2026 Form W-4R – Withholding Certificate for Nonperiodic Payments and Eligible Rollover Distributions If you know a large IRA distribution will land in a bracket above 10 percent, raising the W-4R rate is the cleanest way to keep tax from piling up on the return.
Social Security and Unemployment: Form W-4V
Social Security benefits, unemployment compensation, and certain other government payments use Form W-4V, the Voluntary Withholding Request.9Internal Revenue Service. About Form W-4V, Voluntary Withholding Request Unlike the W-4 or W-4P, you don’t enter a custom dollar amount. You pick from fixed percentages.
For Social Security benefits, railroad retirement benefits, Commodity Credit Corporation loans, and certain crop disaster payments, the choices are 7, 10, 12, or 22 percent. Unemployment compensation has only one option: 10 percent.10Internal Revenue Service. Form W-4V (Rev. January 2026) – Voluntary Withholding Request If 10 percent isn’t enough to cover the tax on your unemployment income, you’ll need to make estimated tax payments to make up the difference.
Send the completed W-4V to the agency issuing your payments, and include your Social Security number or claim number so it reaches the right account.
Third-Party Sick Pay: Form W-4S
If sick pay or disability payments come from an insurance company or other third-party payer rather than directly from your employer, withholding on those payments is voluntary and you use Form W-4S to request it. Enter a whole-dollar amount for each payment period, subject to minimums of $4 per day, $20 per week, or $88 per month. The withholding cannot reduce any single payment below $10. Give the form to the insurer or third-party payer. If your employer pays your sick leave directly, they already withhold taxes and this form doesn’t apply.11Internal Revenue Service. 2026 Form W-4S – Request for Federal Income Tax Withholding From Sick Pay
Using W-4 Withholding to Cover Side Income
Freelance and gig income doesn’t come with automatic withholding, and the usual answer is quarterly estimated payments on Form 1040-ES. There’s a simpler option if you or your spouse also holds a W-2 job: raise the wage earner’s Line 4(c) enough to cover the household’s full tax bill, including the self-employment piece. The IRS Tax Withholding Estimator accepts self-employment income as an input and folds it into the recommended withholding amount.4Internal Revenue Service. Tax Withholding Estimator For the IRS, a dollar withheld from a paycheck counts the same as a dollar sent with a 1040-ES voucher.
Submit the Form and Confirm It Took Effect
Deliver the completed form to whoever issues your payments: HR or payroll for a W-4, the plan administrator for a W-4P or W-4R, the paying agency for a W-4V, the insurance company for a W-4S. Many employers accept W-4 updates through a digital payroll system; others want a signed paper copy.
Employers have to put a revised W-4 into effect no later than the start of the first payroll period ending on or after the 30th day after they receive it.12Internal Revenue Service. Topic No. 753, Form W-4, Employees Withholding Certificate In practice, most payroll departments process changes within one or two pay cycles. Check your next pay stub after the expected effective date. The federal income tax line should show your standard withholding plus the extra amount you asked for. If it doesn’t, contact payroll right away. Keep a copy of every form you turn in.
Timing Matters
A W-4 change only affects paychecks issued after your employer processes it, so a December adjustment can only do so much. If you notice mid-year that you’re behind, act quickly, because every remaining paycheck is a chance to close the gap. If you made a big mid-year bump, revisit your W-4 in January. The per-paycheck amount that made sense across a partial year can overwithhold across a full twelve months.13Internal Revenue Service. Publication 15-T (2026), Federal Income Tax Withholding Methods
When the IRS Sets Your Withholding: Lock-In Letters
Occasionally the IRS decides on its own that a taxpayer is underwithholding and sends a “lock-in letter” (Letter 2800C) to the employer. The letter sets a minimum withholding level, and the employer has to follow it within 60 days.14Internal Revenue Service. Understanding Your Letter 2800C Once a lock-in is in place, you can still submit a W-4 that increases withholding above the floor, but any W-4 that would lower it gets rejected unless the IRS approves the change.
If you get a lock-in letter and think the level is wrong, you have a window before the 60-day deadline to send a new W-4 to the IRS along with a written statement explaining why your withholding should be different. After the lock-in takes effect, the same process applies, except the IRS has to approve the change before your employer can act on it.14Internal Revenue Service. Understanding Your Letter 2800C Most people never see a lock-in letter, but if you’ve previously claimed an unusually low withholding amount, it’s worth knowing the mechanism exists.