Let's assume a Domitianic legion in which a soldier received 300 denarii/year. (I'm trying to figure out what the income of the fiscus Judaicus -40,000,000 sesterces/year- signified for the Roman empire.)
- Cohorts 2-9 had 9*6*80=4320 men, and Cohort 1 had 5*160 men; 5120 men >>> 1,536,000 den.
There were 58 centurios, who earned 5,000 den >>> 290,000 den.
There were 120 cavalrymen, who earned 400 den >>> 48,000 den.
These figures are more or less "hard". I've now visited the library and can get a bit beyond thus. Yann Le Bohec offers a guess for the officers.
- Primipilus: 25,000
Five equestrian tribunes: 5*2500 >>> 12,500
One angusticlavian tribune: 10,000
Praefectus castrorum: 25,000
Prefect of the cavalry: 15,000
I think it is remarkable that a tribune earned less than a centurio, although as an equestrian, he did of course not need the money.
The legatus was, in the Severan age, reckoned to earn as much a procurator: >>> 60,000 (assuming he was a sexenarius).
Assumed sesquiplicarii:
- Tesserarii: 59*450 >>> 26,550
Cornicens: 59*450 >>> 26,550
Signifers: 59*450 >>> 26,550
Assumed duplicarius:
- optiones: 59*600 >>> 35,400
Assumed triplicarius:
Grand total: 2,137,450 denarii, or about 9,000,000 sesterces.
This is, I think, a reasonable guess for the payment of wages. Does anyone have an idea about additional bonuses (bootnail & shoe allowance, fodder allowance for cavalry)? How much money was spent for the upkeep of the fort? What was the prize of weapons and armor? Etcetera?