Probably not ancient. The word εἰσόδημα is attested only in Sphrantzes (15th cent.):
Georgius Sphrantzes Hist., Chronicon sive Minus [Sp.] (3143: 001)
“Georgios Sphrantzes. Memorii 1401–1477”, Ed. Grecu, V.
Bucharest: Academie Republicii Socialiste România, 1966; Scriptores Byzantini 5.
Chapter 23, section 8, line 6
Ἰδοὺ ἐγώ, καὶ ἐὰν ἔχῃ χρείαν καὶ ἄσπρων δι' ἔξοδον καὶ εἰσόδημα
καὶ ἄλλο τι πρὸς θεραπείαν αὐτοῦ, ἕτοιμός εἰμι νὰ τὸν θεραπεύσω”. [TLG]