2026 federal income tax worked example: from gross income to tax

Build taxable income before touching the brackets

Assume a single filer expects $85,000 of gross ordinary income in 2026 and has $3,000 of eligible adjustments. The planning AGI is $82,000. If the filer qualifies for the $16,100 basic standard deduction and has no larger allowable itemized total, taxable income is $65,900.

This example deliberately excludes credits, preferential capital-gain rates, additional deductions for age or blindness, alternative minimum tax, surtaxes, and special income rules. Those omissions make the arithmetic readable, not universally applicable.

• Gross income: $85,000
• Less adjustments: $3,000
• AGI: $82,000
• Less standard deduction: $16,100
• Taxable income: $65,900

Apply the 2026 single-filer schedule one layer at a time

The first $12,400 is taxed at 10%, producing $1,240. The next $38,000—from $12,400 to $50,400—is taxed at 12%, producing $4,560. The remaining $15,500 is taxed at 22%, producing $3,410.

The total illustrated federal income tax is $9,210 before credits and other taxes. The 22% marginal rate describes the next ordinary taxable-income layer in this example; it does not turn the full $85,000 into 22% tax.

Reconcile the estimate with the number you actually need

Tax liability is not the same as a refund or balance due. To estimate the amount still payable, compare the broader return liability with withholding, estimated payments, and refundable credits. To estimate take-home pay, also consider payroll, state, local, and benefit deductions.

Use the calculator to test one assumption at a time and retain the year, filing status, income, adjustments, deduction choice, credits, and excluded items beside the result.