Where the numbers on this site come from, how often they get rechecked, and what happens when one is wrong.
Every rate used in the calculators traces back to a government source, not a summary of one. The 15.3% self-employment tax rate and the Social Security wage base come from IRS Schedule SE instructions and the Social Security Administration's annual COLA fact sheet. Quarterly due dates and safe harbor rules come from IRS Publication 505 and the IRS estimated tax pages. When a guide cites a figure, the source is linked in the text next to it.
The Social Security wage base and Additional Medicare Tax thresholds are reviewed every year after the SSA publishes its COLA announcement, typically in October, ahead of the following filing season. Guides and the calculators themselves get a pass whenever the IRS updates a relevant publication, and at minimum once a year regardless of whether anything changed.
Priya Raman drafts and updates the guides and reference pages. Before a figure change goes live, it gets checked against the source document a second time. Chris Terry, publisher of this site, has final sign-off on anything that changes a tax rate or threshold shown to readers.
If something on this site is wrong, outdated, or unclear, the fastest way to flag it is the contact form. Include the page and the specific figure or claim you think is off. Confirmed corrections get fixed promptly, and the page's last-updated date reflects the change.
Nothing here is a filing service, and none of it is personalized tax advice. The calculators model federal rules using the inputs you give them; they do not see your full return, your state tax situation, or credits specific to your circumstances. For advice tied to your actual numbers, a licensed CPA or enrolled agent is the right resource.