The House Republican plan to extend the debt ceiling for six weeks would permanently ban the Treasury Department from using extraordinary measures to avoid default, congressional aides said.

The provision would ban practices, used by Democratic and Republican administrations for decades, which have effectively allowed the Treasury to limit investments in pensions and other funds when the government bumps up against its borrowing limit. These steps have extended the time that Treasury can continue borrowing and paying the nation’s bills while Congress debates terms for raising the debt ceiling.