Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
Costs of Collection
The ordinary burdens of Roman taxpayers were limited to these imposts; but we may not overlook the fact, that the expenses of collection were very considerable, and the contributors paid an amount disproportionately great as compared with what the Roman government received. For, while the system of collecting taxes by middlemen, and especially by general lessees, is in itself the most expensive of all, in Rome effective competition was rendered extremely difficult in consequence of the slight extent to which the lettings were subdivided and the immense association of capital.
To these ordinary burdens, however, fell to be added in the first place the requisitions which were made. The costs of military administration were in law defrayed by the Roman community. It provided the commandants of every province with the means of transport and all other requisites; it paid and provisioned the Roman soldiers in the province. The provincial communities had to furnish merely shelter, wood, hay, and similar articles free of cost to the magistrates and soldiers; in fact the free towns were even ordinarily exempted from the winter quartering of the troops-- permanent camps were not yet known.
Do you see any typos or other mistakes? Please let us know and correct them
Reference address : https://www.ellopos.net/elpenor/rome/4-11-commonwealth-economy.asp?pg=12