Like the Yellow-margined Flycatcher (Tolmomyias assimilis), the Yellow-breasted Flycatcher has in recent years also been subject to a revisionist taxonomy in parts of the ornithological literature. Overall, the Yellow-breasted Flycatcher is distributed, in a wide variety of forest types, across much of northern and central South America, from northern Colombia and Venezuela, as well as in Trinidad and Tobago, south to the Atlantic coastal forests of eastern Brazil, over which range six subspecies are generally upheld, but some authors have preferred to split this flycatcher into two separate species north and south of the Amazon. When such a proposal is followed, the northern species is usually known as the Ochre-lored Flatbill (Tolmomyias flaviventris), while the southern one takes the name Ochre-faced Flatbill (Tolmomyias viridiceps). Again, however, this division might prove too simplistic, and a wide-ranging vocal and genetic study is ideally required to resolve the Yellow-breasted Flycatcher’s taxonomy. Compared to other members of the genus, the Yellow-breasted Flycatcher is rather easily identified by its usually obviously yellow head and underparts, sometimes with an obvious ochre-colored loral region.