Where Can I Find Out How Much Congress Spends On Itself?

You can find data for legislative branch spening in the data set compiled by the First Branch Forecast, which has a very helpful newsletter by the way.

First, surf to the site’s Data Sets page, then click the House and Senate Appropriations, 1994-present link.

It will download an Excel file to your desktop that you can open. The file contains both spending for the various accounts such as House of Representatives salaries, the Government Publishing Office, etc.