The MTA's upcoming capital program is facing a $15.2 billion shortfall.

According to documents posted on its website Monday evening, the agency's 2015-2019 capital plan will cost a total of $32 billion dollars. The program includes the next phase of the Second Avenue Subway, expanding Metro North's New Haven Line service into Penn Station, expanding the city's bus rapid transit network, and finishing East Side Access.

The MTA says in order to pay for the full plan — which it calls "critical" to the region — it "will work with its funding partners and stakeholders to develop proposal to fill this gap with contributions from the system's many beneficiaries, including such options as new dedicated revenue sources, partnerships that leverage private investment, additional appropriations from state, federal, and local governmental partners, or new MTA debt."

Earlier this year, a report by the State Comptroller predicted a $12 billion funding gap. That report noted that the MTA's previous capital plan had a $9.9 billion gap, which was closed mostly by reducing the program and borrowing money.

The agency's board will vote Wednesday on whether to submit its capital plan to the Capital Program Review Board, a state panel that must approve it.