What this estimate includes
The calculator estimates federal income tax from taxable income, then subtracts the tax credits you enter and compares the result with withholding and estimated payments.
It automatically uses the larger of the 2026 standard deduction or your itemized deduction input. It does not verify whether a credit is allowed, refundable, phased out, or limited by other tax rules.
Source assumptions come from the IRS 2026 tax inflation adjustment release.