The highway, student loan and flood insurance package Congress is expected to approve today includes provisions that would raise $20 billion in new taxes and fees from companies.

One of the new measures would adjust the way pension liabilities are measured for companies. Currently, companies are generally required to contribute more into their pension plans because interest rates are at historic lows.

The bill would adjust the way interest rates are factored in, and allow companies to contribute less to pensions. However, that would also lead to increased tax revenues from these companies, and this change would raise an estimated $9.4 billion over the next decade.