About smarttaxcalc
What we do
smarttaxcalc helps you estimate your taxes quickly: capital gains on investments, self-employment and 1099 income, sales tax, property tax and federal income tax. Every calculator uses official IRS rates (2026 brackets, FICA, NIIT) and recognized sources such as the Tax Foundation for state-level rates.
Why the numbers are trustworthy
Each calculator shows its sources with the access date. Rates are reviewed and updated every year when new figures are published. Calculations run entirely in your browser — no personal data is sent or stored.
Contact
Questions or corrections? We review source data constantly and welcome pointers to official figures. Reach out through the contact information in the privacy policy.