I’m afraid that what I was talking about had little to do with what you are talking about.
To start with 1526 is a little bit too early for the “modern” regular army and then, a single province, even if heavily taxed, hardly would provide a reliable financial base for a strong army of the late XVII - mid- XVIII.
What I was talking about was a model by which the regular troops had been financed in the pre-Petrian Tsardom. The state was extremely short of coin so the regulars had been getting a salary augmented by the private income: at the time free of service the soldiers were allowed to act as traders (streltsy) or to work on the granted small plots of land. Of course, this was resulting in a potentially lower quality of the troops and the problems related to maintaining their households/businesses during the protracted war or even when they were sent to a garrison duty on a border (hence “famous” revolt of the streltsy). But it was still better than noting and had been making army affordable.
Peter found a solution in his typical way: enforced recruitment in a complete disregard of the economy so that even with the military expenses amounting to 70 - 90% of the state income there was a need to close the “gap” by billeting troops in the private lodgings (AFAIK, not just for free but with the wide open field for the extortions by the military commanders).
But the PLC “wojsko komputowe” (as I understand, wojsko kwarciane maintained from the royal estates was abolished in 1652) was financed by the Sejm and amounted approximately to 12,000 in the Kingdom and 6,000 in Great Duchy with Sejm’s approval needed for increasing its size at the time of war and in the case of a prolonged war financing could easily became a serious problem.
You probably agree that army of 20 - 40k (or even slightly more) was inadequate of the needs of the state like the PLC, especially if a big part of these numbers is raised only on ad hoc basis. Having 2 practically independent armies (Polish and Lithuanian) was not helping either.