What weaknesses did the Polish-Lithuanian Commonwealth have in finance and military defense?

The Polish-Lithuanian Commonwealth faced severe structural weaknesses in finance and military defense, primarily stemming from the political dominance of the szlachta (gentry) and their resistance to central authority.12

Financial Weakness

The Commonwealth suffered from chronic financial instability. In the second half of the 17th century, the state budget was approximately 10–11 million zlotys, a fraction of the resources available to contemporary powers like England or France. This fiscal weakness was exacerbated by the lack of a central bureaucracy and the fragmentation of sovereignty, as taxation functions increasingly shifted to local sejmiki (regional assemblies).134

Military Defense

The Commonwealth’s military capacity was fundamentally undermined by the szlachta's political ideology:
* Ideological Opposition: The nobility equated a standing army with royal absolutism. They preferred relying on traditional noble levies, viewing them as a virtuous alternative to a professional military.13
* The Liberum Veto: This constitutional mechanism allowed any single deputy to dissolve the Sejm and nullify all previous legislation. This paralyzed the government, preventing the implementation of necessary defensive reforms or consistent military funding.54
* Resource Allocation: Despite the state's limited budget, roughly 90% of it was consumed by military expenditures, yet this remained insufficient to maintain a modern, effective defense against rising regional powers.13

Ultimately, the szlachta prioritized their perceived "liberties" over the development of a robust state, leaving the Commonwealth vulnerable to its neighbors.42