ABSTRACT

 The study examined the macroeconomic determinants and the performance offirms in Nigeria. The data collection is secondary data, the study used the 1970-2018 time series national data, obtained from the publications of Central Bank of Nigeria (CBN), and National Bureau of Statistics (NBS), for specific objectives. Data collected was analyzed using descriptive statistics. Growth Rate Model, Ordinary Least Square (OLS) Regression Technique, Quadratic Model, Granger Causality test, Unit Root Test, Co-integration test, and Error Correction Mechanism (ECM), t-test and F-test. Foreign direct investment had a significant positive relationship with real gross domestic product during the period ofthis study, specifically the studyfound out that a one percent increase in personal income tax will result to a 437.5482 increase in the real gross domestic product during the time ofthis study and the result was not significant at 0.4403%. Managers should effectively consider interest rates in making borrowing decisions, as this may affect the cost of debt; Government should endeavor to maintain a stable exchange rale to enable firms secure the needed resourcesfromforeign countries.