<p>This study analyzes the relationship between tax revenue and gross national expenditure in Romania, aiming at identifying both short-term dynamics and long-term dependencies. Romania represents a relevant case due to frequent fiscal policy changes and adjustments during economic crises. The gross national expenditure exhibits an initial positive response that increases over the long term, indicating a gradual adjustment to support tax revenue. In the long run, they become a major factor in the dynamics of revenues. Tax revenue is dominated by its own shocks, showing a significant self-regulating capacity in the short term and remaining relatively stable over time. The results obtained provide a solid foundation for understanding the dynamics of certain economic relationships, potentially contributing to the development of effective and sustainable economic policies.</p>