Author
William Petersen, CPA
William Petersen, CPA, founded and maintains salaryincometax.com, including its tax-rule sourcing, calculator methodology, and editorial review process.
Credential
CPA (US)
Public calculators
9
Published guides
23
Contact
support@salaryincometax.com
Who I am
William Petersen is a US Certified Public Accountant (CPA) with over 10 years of experience in independent tax and accounting practice, working directly with individual and small-business clients on tax preparation, payroll questions, and general accounting.
William Petersen founded salaryincometax.com and is personally responsible for the tax-rule sourcing, calculator methodology, and editorial decisions published on the site.
The focus is practical salary questions: how gross salary becomes net pay, how tax and social contributions work, how cost of living changes affordability, and how workers can compare job offers across countries.
The goal is not to replace a payroll department or tax adviser. It's to help readers ask better questions, understand the assumptions behind salary calculators, and spot the costs that can change a relocation or negotiation decision.
Research method
- Apply CPA training and practice experience to check that each country's modeled tax logic (bracket order, deduction timing, how social contributions interact with income tax) reflects how payroll actually works, not just what a published rate table shows.
- Use official tax authority, statistics office, and public payroll references where available - see the Sources page for the reference list behind each country model.
- Separate source-backed calculator pages from illustrative estimate models that are not ready for public navigation.
- Translate tax and salary rules into practical examples, monthly cash-flow context, and clear limitations.
- Link country guides to calculators, source notes, and related cost-of-living articles so readers can verify assumptions themselves rather than take a figure on faith.
Editorial standards
Articles are written for readers making real salary decisions, not for search engines alone. Every guide should answer the core question directly, include practical examples, explain common mistakes, and identify when a reader should replace benchmark data with current quotes or professional advice.
When a figure is estimated, benchmark-based, or dependent on household circumstances, the page says so clearly. The full process is documented on the Editorial Policy page, including where AI-assisted drafting is used and how it's reviewed.
Corrections and updates
Tax rules, contribution rates, wage benchmarks, and housing costs change. Source-backed country pages and blog guides are reviewed as new tax-year data becomes available or when readers report an issue.
Corrections can be sent to support@salaryincometax.com. Please include the page URL, the disputed figure or paragraph, and the source you believe should be reviewed.
Limitations
This calculator provides an estimate only and should not be considered financial, tax, or legal advice.
Calculator outputs and editorial guides are planning tools. Final payroll results can change because of residency status, local deductions, benefits, pension choices, employer setup, bonuses, tax credits, and personal circumstances.