W-4 Withholding Optimizer 2026-2030

Year, Filing & Income

Tax Year

2026 uses Rev. Proc. 2025-32. Later years are projections.

Inflation assumption (% per year)

Used only for 2027-2030 (IRC §1(f), §63(c)(7), §24(i)).

Filing Status (Step 1(c))

Single and MFS use the same W-4 box and table.

Job 1 Annual Wages ($)

The W-4 you are completing. Use the higher-paying job.

Spouse / Job 2 Annual Wages ($)

Enter 0 if none. Only two jobs total can use the Step 2(c) box.

Other Income, Step 4(a) ($)

Interest, dividends, retirement income. Not spouse or Job 2 wages.

Multiple Jobs Method (Step 2)

Applies only when Job 2 wages are entered. Form W-4 Step 2.

Pay Periods Per Year (Job 1)

Credits & Deductions

Children Under 17

Each earns the child tax credit (Step 3(a)). IRC §24.

Other Dependents

$500 each (Step 3(b)). IRC §24(h)(4).

Other Credits ($)

Foreign tax credit, education credits, etc. Added to Step 3.

State & Local Taxes Paid ($)

Income or sales tax plus property tax. Capped under IRC §164(b)(6)-(7).

Home Mortgage Interest ($)

Worksheet line 6c.

Cash Gifts to Charity ($)

Itemized: amount over 0.5% of income. Standard: up to $1,000 ($2,000 joint).

Medical & Dental Expenses ($)

Only the part over 7.5% of income counts.

Other Itemized Deductions ($)

Worksheet line 6e.

Adjustments to Income ($)

Student loan interest, deductible IRA, educator expenses. Line 5.

Qualified Tips ($)

Through 2028. Up to $25,000. IRC §224.

Qualified Overtime Premium ($)

Through 2028. The "half" of time-and-a-half. IRC §225.

Passenger Vehicle Loan Interest ($)

Through 2028. Up to $10,000. IRC §163(h)(4).

Taxpayers Age 65 or Older

$6,000 each through 2028. IRC §151(d)(5)(C).

Target Outcome

Target refund / (balance)

$0 target = break even (no refund, no balance due). Positive = refund you receive. Negative = balance you owe when you file. A small refund is a buffer against estimation errors. A large balance due may trigger the estimated tax penalty under IRC §6654.

W-4 Entries & Analysis

Enter your information above.

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