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This study analyzes the influence of mergers by acquisition on the optimization of financial and tax efficiency in construction companies. Using a quantitative approach, a post-positivist paradigm, and a non-experimental, cross-sectional, and explanatory design, the results of an applied instrument were analyzed with an inter-element correlation matrix, reflecting a mean of 0.508 (range: 0.471 to 0.583), confirming ex-ante psychometric homogeneity. Hypothesis testing using Spearman's rho revealed a moderate-to-strong and significant positive correlation between mergers by acquisition and financial efficiency (rho = 0.583, p = 0.029 < 0.05); conversely, tax efficiency exhibited a non-significant relationship (rho = 0.471, p = 0.169 > 0.05). It was concluded that mergers act as a direct catalyst for optimizing profitability and solvency ratios if supported by due accounting diligence. Second, post-merger tax efficiency exhibits high volatility due to the regulatory complexity of Panama's DGI (General Directorate of Revenue). Third, these findings methodologically justify the need to transition to a confirmatory structural model applicable to the Panamanian construction sector.