is irr the same as roi 
although irr is sometimes referred to informally as a project s return on investment it is different from the way most people use that phrase often when people refer to roi they are simply referring to the percentage return generated from an investment in a given year or across a period however that type of roi does not capture the same nuances as irr and for that reason irr is generally preferred by investment professionals another advantage of irr is that its definition is mathematically precise whereas the term roi can mean different things depending on the context or the speaker 