A CP14 notice informs you that you owe taxes and provides details about the amount due, including penalties and interest.

An IRS CP75 notice requests proof for tax credits or deductions claimed during an audit.

A CP501 notice is a reminder from the IRS that you have an unpaid balance on your taxes and provides instructions on how to pay.

A CP2000 notice proposes changes to your tax return due to discrepancies between the income reported on your return and information from third parties.

A CP11 notice is sent when the IRS finds an error on your tax return that changes your refund or balance, leaving you with taxes owed.

A CP12 notice informs you that the IRS made corrections to your tax return, which resulted in a refund, a reduced balance, or confirmation that no additional amount is due.

An IRS CP13 notice informs taxpayers that the IRS made corrections to their tax return, resulting in no additional balance due and no refund owed.

A CP71 notice reminds you that you still owe taxes from a previous IRS balance and includes the current total, including penalties and interest.

A CP22A notice is issued when the IRS makes adjustments to your tax return based on the information you provided, resulting in a balance due.