I used Claude Code to prepare my personal income tax return this year, and so far the IRS hasn’t come after me.

Had Claude generate yaml files for the input/source documents, then had it generate code to process the return into output yaml files.

Manually typed the results into the IRS Free File Forms website, and was pleased to see that it did some input validation.

Had it generate Code modules to match the IRS forms and schedules by name, keeping the nomenclature in code as close as possible to that in the official IRS instructions.

Spot checked a whole lot of it and found very, very little of it that needed correction.

Stored all of it in git so that I could monitor the diffs as it went along.

Maybe the neatest part was when I asked Claude why I wound up owing so much it gave me a list of reasons and dollar amounts in descending order.

Still blows my mind that Americans have to do this.

In the UK almost nobody needs to "file their takes" and if you do you just do it online without the need for software.