About CalcSumly

Why this site exists

CalcSumly builds free, accurate finance calculators for US freelancers and the self-employed. The big finance sites chase mortgages and retirement; the day-to-day money questions of 1099 workers — self-employment tax, quarterly estimates, deductions, real take-home pay — are underserved or buried behind sign-ups. Each tool here is hand-built, shows the formula it uses, walks through a worked example, and cites the IRS or SSA source it relies on.

Who builds it

Dr. Julian Vance

Co-founder, Lead Data Architect & Primary Author

Julian leads the data and methodology behind CalcSumly's calculators, with a background in applied economics and quantitative analysis of tax and housing data. He focuses on building tools from primary public datasets (IRS, SSA, US Census) rather than oversimplified estimates.

How we keep figures accurate

Every dollar amount, rate, wage base, and contribution limit changes annually. We pull each figure from the current IRS and SSA publications, cite the source on the tool, stamp each page with the tax year and the date it was last verified, and re-check every figure each January. See our methodology for details.

A note on advice

These calculators are educational estimates, not tax, legal, or financial advice. They can't see your full situation. Use them to understand the math and plan ahead, then confirm with the cited IRS source or a qualified tax professional before filing.