This is a supplement to the marginal tax rate post, and an updated version of the 2020 tax rate visualization (adding 2023 tax information). The top chart computes and displays both single and married marginal taxes on employee income in California. The idea is to give a quick reference on the effective tax rate on additional income. All tax data is for 2023.
While the marginal tax rate post serves as a quick reference on how much tax you’ll pay on additional income, it doesn’t show the overall tax burden. This chart has a number of views to see the amount or percentage of income paid to taxes with varying levels of income. As usual, this chart is for California. If you’d like other states to be added, let me know.
By changing the settings, you can look at different income ranges, view by absolute dollars or percentage of income, and stack/unstack the various taxes. All information stays local to your computer, I don’t know anything about what inputs you provided.
Disclaimer: I’m not a financial professional, and this chart probably contains errors; it ignores the standard deduction at a minimum. This does not constitute tax advice. Consult your accountant or tax lawyer.
My sources were Caltax’s rate summary, the California Franchise Tax Board’s Form 5805 instructions, the Tax Foundation’s summary of 2023 tax brackets, the Social Security Administration publication 05-10003, and Healthline’s additional medicare tax page.