Obviously you continue to take in money because people pay taxes and all the other ways that revenue comes into the Treasury, but you are in a situation where, absent your borrowing authority, you have bills and obligations that far exceed the money in your pocket.

WHITEHOUSE: Press Briefing

His handling so far of the tricky welfare-reform issue has been assured, provoking neither indignation among Labour backbenchers nor yet the hostility of a Treasury reluctant to pay for expensive programmes to propel benefit claimants into work.

ECONOMIST: Bagehot

Rallies also pump money into the U.S. Treasury, as rich people take profits and pay tax on them.

FORBES: Magazine Article