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
To this was added the produce of cattle-fines and confiscations and the gains of war. In cases of need a contribution (-tributum-) was imposed, which was looked upon, however, as a forced loan and was repaid when the times improved; whether it fell upon the burgesses generally, or only upon the --metoeci--, cannot be determined; the latter supposition is, however, the more probable.
The king managed the finances. The property of the state, however, was not identified with the private property of the king; which, judging from the statements regarding the extensive landed possessions of the last Roman royal house, the Tarquins, must have been considerable. The ground won by arms, in particular, appears to have been constantly regarded as property of the state. Whether and how far the king was restricted by use and wont in the administration of the public property, can no longer be ascertained; only the subsequent course of things shows that the burgesses can never have been consulted regarding it, whereas it was probably the custom to consult the senate in the imposition of the -tributum- and in the distribution of the lands won in war.
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Reference address : https://www.ellopos.net/elpenor/rome/1-05-original-constitution-rome.asp?pg=22