Calculator method
Calculator pages start with user-entered inputs, apply visible formulas, and label exclusions before showing related guides and official sources.
Calculator inputs run in the browser unless a page explicitly states otherwise. Equity Tax Lab does not store calculator input values.
Source-check method
Source checks compare page claims against listed official sources. This is an editorial process, not professional tax review.
Each official source should explain what it supports, when it was checked, and where the reader can verify the original material.
Expert-review method
A page is marked expert-reviewed only when a qualified external tax, legal, payroll, or financial professional reviews the page and is named or otherwise documented.
Known limits
State tax, local tax, filing method, valuation, liquidity, AMT interactions, payroll treatment, and personal return facts can change outcomes. Those topics require official instructions and professional review.