There are three types of audits in terms of scope and taxpayer type. One is the correspondence examination, the other is the office examination, and the third is the field examination.

First are the correspondence examinations. This audit is the most popular one. As the name says, this type of audit is done by mail. It has a limited scope and is primarily limited to one or two things on the return.

Next audit is the office examinations. This audit is usually more expansive in scope. The analysis is more comprehensive, and it involves several reviews. It is also the second most popular audit. As the name implies, audits occur in the IRS' local offices.

The third type of audit is the field examination. This one requires that the IRS conducts the audit at the taxpayer's property or where the bookkeeping is kept. Field exams are the most challenging and thorough in carrying. Lastly, it is the least frequent audit, and it is the lengthiest. It can last months or years to conclude.

Those are the three types of audits in terms of scope and taxpayer's type.

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