Tax refund methodology
A transparent reconciliation—not a hidden tax engine.
Formula
Refund or balance = federal withholding + other federal payments + refundable credits − estimated total federal tax
A zero or positive result is labeled an estimated refund. A negative result is labeled an estimated balance owing and displayed as an absolute amount. The effective rate is estimated total federal tax divided by gross income.
Scope
The model is intended for U.S. federal individual income-tax reconciliation. The user supplies total tax after using a current, authoritative calculation. The tool does not apply tax brackets, filing status, standard or itemized deductions, dependent rules, alternative minimum tax, self-employment tax, net investment income tax, credits, penalties, or interest.
Assumptions
- All inputs refer to the same taxpayer return and tax year.
- Withholding and payments are federal income-tax amounts actually credited to that return.
- Refundable credits are entered separately and are not already netted into total tax.
- Total tax is nonnegative and already reflects the return’s applicable rules.
- State, local, payroll, and foreign taxes are excluded.
Limitations and checks
The result cannot confirm eligibility, detect missing forms, identify offsets, estimate processing time, or test underpayment penalties. Compare every payment with source forms and IRS account records where available. If this estimate differs from tax software, investigate the inputs rather than averaging the two results.