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W-4 Withholding Planner

Two incomes, one tax return — and each payroll withholds as if its paycheck were the only one. Enter both salaries to see the April gap your W-4s are building, what the Step 2(c) checkbox actually changes, and the exact Step 4(c) extra that closes it.

Will you owe in April?

Enter both salaries, your pay frequencies, and what your W-4s already claim. The planner runs the 2026 married-filing-jointly math both ways — bare W-4s vs the Step 2(c) checkbox — and hands you the exact entries for each form.

Spouse A

Annual salary $

Gross yearly pay, before any deductions.

Paid

Spouse B

Annual salary $

Enter 0 if only one spouse works.

Paid

Children under 17

$2,200 credit each for 2026.

Other dependents

$500 credit each.

Other yearly income $

Interest, dividends, side work — Step 4(a).

Extra deductions $

Above the $32,200 standard — Step 4(b).

Extra withheld /paycheck $

Already in Step 4(c)? Enter it here.

Step 2(c) checkbox

The multiple-jobs box.

Step 3 credits

Child/dependent credits.

Try:

Owed next April$6,060True tax $10,940/yr · payrolls withhold $4,880/yr · Step 3 adds $169.23/paycheck to your pay

No Step 2 adjustment · withheld/yr$4,880Closest

Step 2(c) on both W-4s · withheld/yr$11,590Closest

Combined household income

A · $90,000B · $60,000

$0$150,000

What each payroll sees without Step 2

$32,200 untaxed10% · $24,800 → $2,48012% · $76,000 → $9,12022% · $17,000 → $3,740A = Spouse A · B = Spouse B

Without Step 2, payrolls count two $32,200 deductions and two sets of low brackets — $64,400 of deduction room and $49,600 of 10%-bracket room for one household that gets $32,200 and $24,800. That double-count is the $6,060.

Filing status

Married filing jointly — on both W-4s.

2(c)

Multiple jobs / spouse works

Check the box on both W-4s. One box alone mis-splits the brackets.

≈ $650 refund

Claim dependents

Claim $4,400 (2 under 17 × $2,200) — on the higher earner's W-4 only.

$169.23/paycheck

4(c)

Extra withholding

Extra withholding to close the gap — on Spouse A's W-4 only (the higher earner), so you don't double-correct.

$233.08/paycheck

On track to owe $6,060 in April. Each payroll withholds as if its salary were the household's only income — the full $32,200 standard deduction and the full low brackets, counted twice. That double-count costs $6,060/yr on these salaries. Your $4,400 of Step 3 credits already arrive in your paychecks ($169.23 each), so they cannot shrink the April bill — only Step 2 can. Pick one fix: check Step 2(c) on both W-4s — April flips to a $650 refund, because the box over-withholds a little when the two pays differ; or add $233.08/paycheck in Step 4(c) on the higher earner's W-4.

How it works: your true tax is the 2026 married-filing-jointly tax on both salaries (plus other income) minus the $32,200 standard deduction, extra deductions, and $2,200 per child under 17 ($500 per other dependent). Each payroll, left alone, withholds the same MFJ tax on its salary alone — full deduction, full low brackets, twice. The Step 2(c) checkbox tells each payroll to use half the deduction and half the brackets, which lands withholding near the true household number. Step 4(c) is the fine-tuning knob: a flat extra amount per paycheck on one W-4.

How the two-income withholding math works

Payroll software is literal-minded: give it a W-4 that says "married filing jointly" and it withholds as if that salary were the household's entire income. It applies the whole $32,200 standard deduction and runs the whole salary through the 10% and 12% brackets first. Do that at two jobs and the household gets two standard deductions and two sets of low brackets — while the actual tax return allows one. The gap between the doubled math and the single return is the April bill two-income households keep discovering.

The formula

true tax = MFJ tax on (both salaries + other income − $32,200 − extra deductions) − $2,200 × kids − $500 × other dependents · bare withholding = MFJ tax on (salary A − $32,200) + MFJ tax on (salary B − $32,200) · April gap = true tax − withheld

The Step 2(c) checkbox fixes this at the source: each payroll switches to half the standard deduction ($16,100) and half of every bracket, so the two halves add back up to roughly one correct household calculation. It is exact when the two pays are equal and drifts into slight over-withholding as they diverge — try the "Unequal" scenario above to see the drift.

Worked example: $90,000 + $60,000, two kids

Combined salaries: $150,000. Minus the $32,200 standard deduction, $117,800 is taxable: 10% on the first $24,800 ($2,480), 12% on the next $76,000 ($9,120), 22% on the last $17,000 ($3,740) — $15,340 of tax. Two child credits at $2,200 each cut it to a $10,940 true tax.

Bare W-4s: Spouse A's payroll withholds tax on $90,000 − $32,200 = $57,800 → $6,440. Spouse B's withholds on $60,000 − $32,200 = $27,800 → $2,840. Claiming the $4,400 of credits on Step 3 trims withholding to $4,880.

April gap: $10,940 − $4,880 = $6,060 owed. Check Step 2(c) on both W-4s and withholding becomes $11,590 — a $650 refund. Or skip the box and add $233.08 per biweekly paycheck ($6,060 ÷ 26) in Step 4(c) on the higher earner's W-4.

Where this comes in handy

The April forecast: run your two salaries before year-end — the gap number tells you whether to adjust now or brace for April.
The checkbox decision: the comparison bars show whether Step 2(c) lands you near zero or over-withholds on unequal pays.
New-job W-4 setup: bring the checklist to HR — it lists the exact entry for every line that matters.
The October re-check: a raise, bonus, or new baby changes the math; re-run the planner and update Step 4(c) for the remaining paychecks.
The new-baby update: add the child to Step 3 on the higher earner's W-4 — worth $2,200/yr, or about $84.62 per biweekly paycheck.
The "why do we always owe?" answer: the bracket ladder shows the double-count visually — useful the next time someone says "but we both had taxes taken out."

W-4 withholding — frequently asked questions

Do we check the Step 2(c) box on both W-4s, or just the higher earner's?

Both. The checkbox tells each payroll to use half the standard deduction and half the brackets — the two halves only add up to one correct household calculation if both payrolls do it. Checking it on one form alone mis-splits the math and usually over-withholds. Run the "Two earners" scenario above with the box on to see it land near zero.

We both claimed our kids on Step 3 — is that why we owe every April?

Very likely a big part of it. Each $2,200 child credit claimed on Step 3 lowers that payroll's withholding by $2,200 for the year. Claim the same kids on two W-4s and you collect the credit twice in your paychecks — then the tax return grants it once, and the difference shows up as an April bill. Only the higher earner should fill in Step 3; the other spouse leaves it blank.

My spouse earns much less than I do — is the checkbox still the right move?

It still closes most of the gap, but it over-withholds more as the pays diverge: on $120,000 + $40,000 the box swings a $6,720 shortfall to a $2,650 refund. The IRS guidance is that the checkbox fits best when the lower pay is more than half the higher pay; with very unequal incomes the online Tax Withholding Estimator (or the worksheet) lands closer to zero. Try the "Unequal" scenario to see your numbers.

Can one spouse's Step 4(c) extra withholding cover both of us?

Yes — and that's the intended design. Step 4(c) is a flat extra dollar amount per paycheck, so putting the whole household gap on the higher earner's W-4 is exactly how the IRS expects you to use it. The one rule: coordinate. If both spouses add the full gap, you've doubled the fix and manufactured a big refund.

My paycheck shows $0 federal tax withheld — is that normal?

Often, yes. A payroll withholds $0 whenever the annualized salary minus the $32,200 standard deduction (married filing jointly) comes out at or below zero — for example, a $30,000 salary at one job. It does not mean the household owes nothing: the other spouse's income still fills the brackets on the joint return. Enter both salaries above — the planner shows the household gap even when one paycheck shows $0.

A bonus and overtime pushed us into a higher bracket — how do we fix withholding now?

Use Step 4(c) for the rest of the year: take the shortfall, divide by the paychecks remaining, and put that per-paycheck amount on the higher earner's W-4. October is the classic moment for this re-check — there are still enough paychecks left to spread the fix painlessly, and you'll see the corrected withholding on the next pay stub.

What happens if we just skip Step 2 entirely?

You get the default this planner models as "no Step 2": each payroll withholds as if it were the only income. On $90,000 + $60,000 with two kids, that builds a $6,060 April bill — $6,060 of tax the return charges that the paychecks never collected. Skipping Step 2 is the single most common reason two-income households owe in April.

Should Steps 3 through 4(b) go on both W-4s?

No — put them on the highest-paying job's W-4 only, and leave them blank on the other. Steps 3–4(b) are household-level adjustments (credits, deductions); entering them twice double-counts them the same way skipping Step 2 double-counts the deduction. The checklist above follows this rule automatically.