Fellows usually make only slightly more than residents. The pay scale at most institutions is set from PGY-1 through PGY-8 with increases of 1 to 2 thousand dollars every year. So a first year resident (PGY-1) can start at $38,000 and a interventional cardiology fellow in his final year of fellowship (PGY-7) can make $48K-$50K. Many fellows do more moonlighting to supplement their income, depending on the specialty. Some can make upwards of 100K if their fellowship isn't too intense.