The processes and procedures required for an audit, review, and compilation all differ significantly, which means that the costs will differ significantly as well.A compilation takes the least amount of time, which makes it the lowest cost option for your business. However, it is the least comprehensive of the methods.A review requires much fewer hours than an audit, but more hours and processes than a compilation, making it the second cheapest option for your business.While an audit tends to be the most expensive option, it is also the most thorough and complete analysis and overview of your financial statements.