Questions and answers
Frequently Asked Questions
This page covers the common questions users have about accuracy, assumptions, and how to use UsefulTax for salary planning.
Last reviewed: 2026-03-13
How to use this page
This FAQ is designed to answer the recurring questions users ask before relying on a planning estimate, especially around accuracy, state differences, and what the calculator does not model.
How accurate is this tax calculator?
UsefulTax uses 2026 federal tax brackets and standard assumptions for FICA and state income tax. It does not include every deduction, employer payroll setting, or local tax, so your real paycheck may differ.
What is FICA tax?
FICA stands for the Federal Insurance Contributions Act. It funds Social Security and Medicare and is usually withheld directly from employee paychecks.
Does this include local taxes?
Not fully. Some cities and local jurisdictions apply income taxes or payroll taxes that are not part of this simplified estimator.
Can I use this for job offers and relocation decisions?
Yes. That is one of the main use cases. The most useful view is usually monthly or per paycheck, because that makes differences easier to compare in practice.
Why do state pages matter if I already have the homepage calculator?
State pages add context, comparisons, and a faster path for users who arrive from search looking for a specific state take-home pay estimate.
Who maintains UsefulTax?
UsefulTax is maintained as an independent educational site under the UsefulTax brand. The goal is to keep the calculator and support pages useful for planning, while being clear about limitations and update dates.
Should I rely on this for filing my taxes?
No. UsefulTax is for planning and comparison only. It is not a filing tool and it does not replace personalized professional tax advice.
Common planning reminders
It helps you compare rent, childcare, savings, and recurring bills more realistically than annual totals alone.
They are useful when you already know the state you care about or want a faster answer from search without reconfiguring everything manually.
Still deciding?
Go back to the calculator, review methodology, or learn more about the site
Use the homepage calculator for a quick estimate, then compare two states under the same salary assumptions.