From Desk Review to Field Verification and the Tax Audit Modality Revenue Paradox in Southwest Nigeria

Abstract

This study examines why desk audits can be perceived as operationally useful while showing little independent association with revenue generation, and whether field verification supplies the missing enforcement intensity. It develops a distinct empirical analysis from a 2025 survey of 374 employees of federal and state revenue authorities across the six states of Southwest Nigeria. Item-level descriptive statistics, Pearson correlations and multiple ordinary least-squares regression are re-examined with the appendix/SPSS outputs treated as the authoritative statistical record. Desk-audit items show comparatively strong support for return comparison and office-based record assessment, but the weakest desk-audit rating concerns the availability of technical tools. Field-audit responses are more uneven: validating desk-audit reports records the strongest field-audit rating, whereas direct verification activities receive lower scores. At the construct level, desk audit is weakly and negatively correlated with reported revenue generation (r = -0.050, p = .335) and remains statistically insignificant in the multivariate model (B = -0.046, beta = -0.065, p = .190). Field audit is positively correlated with revenue generation (r = 0.227, p < .001) and retains a positive independent association after controlling for desk and back-duty audits (B = 0.080, beta = 0.112, p = .029). Recalculation from the ANOVA sums of squares gives R² = .158 and adjusted R² = .151. The findings support an escalation interpretation: desk review is best treated as a screening and information-production stage, while targeted field verification converts detected anomalies into enforceable adjustments. The paper concludes that digital desk analytics, risk scoring, case escalation and field capacity should be designed as one integrated audit architecture rather than as competing audit modes.