For the 2009 legislative session, Marostica was named to a seat on the legislature's Joint Budget Committee, and a seat on the House Appropriations Committee as the ranking Republican member. During hearings before the beginning of the legislative session, Marostica supported withdrawing all state funding from public research universities, a move opposed by university leaders, but which was discussed more seriously after poor economic forecasts. Marostica also helped to lead an effort to allow the state to tap the financial reserves of Pinnacol Assurance, a quasi-governmental worker's compensation insurer, in order to balance the state budget. Following the legislative session, Marostica served on Colorado's Long-Term Fiscal Stability Commission, a panel created by legislation during the 2009 General Assembly to consider changes to constitutional constraints on the state budget.