This paper examined the effect of tax identification number on revenue generation in south-west, Nigeria. The ex-post facto research design was adopted and the population covered all the states in the Southwest geopolitical zone of Nigeria, out of which three states namely Ekiti, Osun and Ondo States were selected as the study elements using simple random sampling technique. Quantitative secondary data were sourced from the State Board of Internal Revenue of the sampled states spanning from 2008-2017 for a period of 10 years segregated into Pre-TIN (2008-2012) and post-TIN (2013-2017). The analysis used mean and sampled paired t-test to reveal that there was a positive and significant difference between internally generated revenue of the sampled states before and after the introduction of TIN. The paper concluded that TIN has improved revenue generation in Southwest, Nigeria. The study recommended that intermittent checks of all the platform related to TIN should be carried out so as to detect and prevent abuse and other fraudulent activities. It was equally recommended that regulatory agencies of the government should enlighten taxpayers on the benefit of Tax Identification Number (TIN) to improve revenue generation.
Key words: Tax identification number, revenue generation, taxpayers.
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