Marginal is not effective
A marginal bracket applies only to the next dollars inside that band. The effective rate divides total estimated federal liability by total entered income.
2026 US federal planning estimate
Trace income from gross earnings to refund or amount due
Apply 2026 federal brackets and standard deductions, then add withholding, estimated payments, deductions, credits, self-employment income, and an optional state-rate estimate.
Plan with context
A tax estimate should show how every layer connects.
This planning worksheet moves from gross income to adjusted gross income, deductions, taxable income, progressive brackets, credits, payments, and the final estimated settlement.
AGI comes before deductions
Eligible pre-tax retirement contributions, HSA contributions, and half of modeled self-employment tax reduce adjusted gross income before the standard or itemized deduction.
Standard versus itemized
The calculator automatically uses the larger entered itemized amount or 2026 standard deduction for the selected filing status.
Credits versus deductions
A deduction reduces taxable income. An entered nonrefundable credit reduces calculated tax directly, but not below zero in this model.
Payments determine settlement
Withholding and estimated payments do not change the tax calculation itself. They determine whether the estimate ends with a refund or amount due.
Tax returns contain exceptions
Capital-gain rates, phaseouts, refundable credits, AMT, QBI, additional Medicare tax, and state-specific rules need a fuller filing analysis.
Included
2026 federal brackets and standard deductions, four common filing statuses, ordinary income, simplified self-employment tax, adjustments, deductions, credits, payments, and a bracket worksheet.
Not included
Preferential investment-income rates, dependents, refundable credits, AMT, QBI, detailed business deductions, every payroll-tax rule, or a state-specific tax return.
Use it well
Enter year-to-date figures and expected remaining income, compare the result with projected withholding, and use filing software or a qualified professional for an actual return.