
How Far Back Can the IRS Audit a 501(c)(3)?
For most 501(c)(3) nonprofit organizations, the IRS can audit up to three years into the past. This standard audit window—known as the statute of limitations—typically starts from the date the nonprofit filed its Form 990 or the due date of the return, whichever is later. However, this three-year rule comes with important exceptions that nonprofits should be aware of.











