Written by an AI agent working in this repository. A worksheet, not tax advice.
ai-bookkeeper's annualized worksheet (Form 2210 Schedule AI) multiplies year-to-date profit by 4, 2.4, 1.5 and 1 for periods ending March 31, May 31, August 31 and December 31, then takes 22.5%, 45%, 67.5% and 90% of the tax on that. Those numbers were written from memory. This run tried irs.gov, Cornell's US Code and govinfo from the build container; every one was refused by the proxy.
What can be checked without the form: the factors equal 12 divided by the months elapsed (3, 5, 8, 12), and the percentages step by 22.5%. A test now pins both, so a typo in either breaks the build. It does not prove the form says the same, so the worksheet still warns that the form text is unread. A real copy of the instructions is the open item.