simpletaxcalculator.app
Editorial Policy
This page explains how Simple Tax Calculator collects, reviews, validates, and maintains the tax rate data and calculation logic used across this platform.
Last reviewed: May 2026
Our editorial principles
Accuracy, transparency, and clarity are central to how we build and maintain our tax calculators. We aim to:
- Use official government and tax authority sources whenever possible
- Present tax calculations in a simple and understandable format
- Clearly separate verified information from estimates or simplified assumptions
- Regularly review calculators and tax rate datasets
- Maintain transparency about how calculations are produced
Our content and calculators are designed to help users better understand common tax calculations — not to replace professional tax advice.
Sources and data collection
Tax rates, thresholds, and related information are gathered from official public sources including:
- State Departments of Revenue and their published rate tables
- IRS publications, revenue procedures, and official notices
- Official state and local government tax documentation
- Government-published tax tables and legislative updates
We do not rely exclusively on third-party aggregators for tax rates. Each calculator page links to the relevant official source so users can verify rates independently.
Review process
Our review process combines professional financial oversight, structured data research, and technical validation across three distinct roles.
Financial review
Calculator methodologies, tax assumptions, and rate logic are reviewed by our Lead Financial Reviewer. His review covers the financial accuracy of calculation logic and rate data before publication.
Data research and validation
Tax rate datasets are collected and verified by research contributors with experience in data systems, compliance reporting, and data analytics. Contributors cross-reference rate data against official state Department of Revenue websites before it is published.
Technical validation
Calculator implementation, formulas, and system logic are developed and maintained by our engineering team. All calculations are tested against known outputs before deployment to ensure they are stable, reproducible, and accurate.
Update policy
We review our rate datasets and calculators regularly. Updates are published when:
- State or local tax authorities publish new rates or thresholds
- Tax laws or regulations change at the state or federal level
- Errors or inconsistencies are identified internally or reported by users
- New jurisdictions or calculator features are added
Update frequency varies by tax category and the publication schedules of the relevant authorities. The date of the most recent rate verification is displayed on each calculator page.
Error correction
If you identify an error in our data or calculation logic, please contact us at contact@simpletaxcalculator.app. We review all correction requests within 5 business days and publish corrections promptly when verified.
Independence
Simple Tax Calculator is independently operated by Kobina AB, based in Stockholm, Sweden. We do not accept payment to feature, promote, or modify tax rate data.
Our contributors and reviewers may hold positions in other organizations. These external roles do not influence our editorial standards or review process. We maintain a clear separation between financial review, data collection, and technical implementation.
Limitations
Our calculators provide simplified estimates based on publicly available rate data. They do not account for all individual circumstances, exemptions, credits, or jurisdiction-specific rules that may affect a user's actual tax liability. Users should verify tax matters with official government sources or consult a licensed tax professional before making financial decisions.
Contact
Editorial questions and correction requests:
contact@simpletaxcalculator.appAbout Us · Last reviewed: May 2026