The Internal Revenue Service defines a private letter ruling, or PLR, as a statement issued to a taxpayer that interprets and applies tax laws to the taxpayer's specific set of facts. A PLR is issued to establish with certainty the federal tax consequences of the applicant’s tax question, and the findings are binding on the IRS. The resolution of the tax question in the requested PLR may not be relied on by other taxpayers. The PLRs are generally made public after the taxpayer’s identifying information has been removed from the document.

PLRs are important to planned giving to understand innovative gift planning opportunities. Although the PLRs are not binding on other taxpayers, donors and their advisors have a better understanding of how the IRS would rule when presented with a case with the same facts. While other donors may not rely on private letter rulings, certain unique planned giving options are now more common based on the PLR outcomes, such as flexible and step gift annuities, reinsured charitable gift annuities, commuted payment gift annuities, and more.