Zhisan
Independent Developer & Author
About the Author
Zhisan is an independent developer who builds and maintains the free tools and calculators on ByteJSON. With a background in software development, Zhisan focuses on creating accessible, privacy-focused web applications that help people make informed financial decisions without compromising their personal data.
All tools on ByteJSON run entirely in the browser — no data is ever sent to a server. This commitment to privacy means users can calculate their taxes, plan their retirement, or compare employment options with complete confidence that their information stays on their device.
Areas of Expertise
Developer Tools
Building fast, client-side utilities for JSON processing, encoding, formatting, and more.
US Personal Finance Calculators
Creating accurate, easy-to-use calculators for mortgage, retirement, and investment planning.
Self-Employment Tax Calculations
Helping freelancers and independent contractors understand and estimate their self-employment tax obligations.
Income Tax Calculations
Providing federal income tax estimates based on current IRS tax brackets and standard deductions.
All calculations are based on official, publicly documented sources such as the Internal Revenue Service (IRS) and the Social Security Administration (SSA).
Pages Authored & Maintained
The following tax and finance calculators are built and maintained by Zhisan on ByteJSON:
Calculate your self-employment tax based on net earnings
Compare take-home pay between 1099 and W-2 employment
Estimate the tax impact of converting to a Roth IRA
Estimate your federal income tax liability
Plan your retirement savings and withdrawals
See how compound interest grows your money over time
Project investment growth with regular contributions
Important Disclaimer
Zhisan is not a certified public accountant, tax attorney, or financial advisor. The calculators on ByteJSON are built using publicly available IRS publications and official government data. They provide estimates for educational purposes and should not replace professional tax or financial advice. Always consult a qualified professional for decisions that may affect your financial or tax situation.
Commitment to Accuracy
Keeping calculators accurate and up to date is a top priority. Whenever the IRS publishes updated tax brackets, standard deductions, or contribution limits, the calculators on ByteJSON are updated to reflect the latest figures. All calculations are verified against official IRS publications and SSA documentation to ensure reliability. If you ever spot a discrepancy, please reach out so it can be corrected promptly.
Contact & Connect
Have questions about a calculator, found a bug, or want to suggest a new tool? Feel free to reach out through any of the channels below.
GitHub: github.com/colodoo · Email: [email protected]