This study is to investigate the effect of Tax Evasion and Tax Avoidance on internally revenue in Oyo State. The desire to uplift one’s society should be the desire of every patriotic citizen (Allingham and Sandom 1972).

Tax payment is a demonstration of such desire. Tax is a financial issue and its payment is a civil duty. It is the imposition of a financial burden for the government on individual firm and companies. In general based, the word tax means any contribution imposed by the government upon individual and companies for the use of government to provide facilities or services as rendered by the state. It is not a voluntary payment or donation but an enforced contribution made on the pronouncement or directive of legislative authorities.