The IRS Private Letter Rulings database lives at irs.gov/written-determinations, where the agency posts new rulings every Friday alongside Technical Advice Memoranda and Chief Counsel Advice. You can search by ruling number, Uniform Issue List Code, subject, or release date. Each ruling technically binds only the taxpayer who requested it, but the collection is public because Section 6110 of the Internal Revenue Code requires it, and the documents give everyone else a usable window into how the IRS reads specific parts of the tax code.
Where the Database Lives and What It Contains
Two URLs matter. The main search page is irs.gov/written-determinations. The raw document folder, if you’d rather browse or download files directly, is at irs.gov/pub/irs-wd.
On the search page, there’s a “Find” box for keywords and four sortable columns: ruling number, Uniform Issue List Code (UILC), subject, and release date. That’s the whole interface. No Boolean operators, no dropdown for IRC section, no advanced filters. It’s functional and basic.
One thing the tool cannot do: find rulings by the taxpayer who requested them. Section 6110 requires the IRS to redact names, addresses, and other identifying details before publication, replacing names with generic labels and stripping proprietary financial figures. No database, free or commercial, will show you who asked for a given ruling.
How PLR Reference Numbers Work
Every Private Letter Ruling carries a seven-digit reference number that encodes when it was released. The first two digits are the year, the next two are the week of the year, and the final three are the sequence number within that week’s batch. PLR 202615003 was the third ruling released in the fifteenth week of 2026.
If you already have a number from a court opinion, a journal article, or a colleague, typing it straight into the “Find” box is the fastest way to pull the document. Technical Advice Memoranda use a parallel seven-digit numbering system, so the same trick works for them.
Search Strategies That Actually Work
The most productive way to search the free database is by Uniform Issue List Code. UILC codes map to specific Internal Revenue Code sections and sub-issues, so if you’re researching like-kind exchanges, you’d look for codes tied to Section 1031. Because the UILC column is sortable, related rulings cluster together and you can scan them as a group. Pairing a UILC filter with a date range narrows things quickly when you only want recent guidance.
Keyword searches through the “Find” box work for broader research but return noisy results. Tax concepts travel under multiple labels, so run several variations. A search for “installment sale” and one for “installment obligation” may pull up different rulings on the same underlying topic. Try the synonyms before concluding the database is empty on your issue.
When the free site’s limits get in the way, commercial tax research platforms such as Thomson Reuters Checkpoint, Bloomberg Tax, and Westlaw carry the same PLR text with stronger search engines, cross-references to related rulings and code sections, and editorial annotations. The underlying documents are identical because everything originates in the IRS’s disclosures. What you’re paying for is indexing and search, not different content.
What’s Inside a Private Letter Ruling
Rulings follow a consistent structure, and knowing the parts lets you triage relevance in a minute or two.
- Statement of facts. The specific transaction, the parties (with names redacted), the financial arrangements, the timeline. This section decides whether the ruling is useful to you. Your situation has to track closely with these facts for the analysis to translate.
- Applicable law. The IRC sections, Treasury Regulations, and other published guidance the IRS relied on. It builds the framework for what follows.
- Analysis. The IRS’s reasoning connecting the facts to the cited law. Often the most instructive section for anyone trying to understand how the agency thinks about a novel issue.
- Conclusion. A concise statement of the tax treatment the IRS will apply to the described transaction.
- Non-precedent caveat. A standard statement that the ruling applies only to the requesting taxpayer and cannot be cited as precedent.
Read the facts first. A ruling’s conclusion is only as broad as the facts it rested on. If your transaction differs in a way the IRS treated as material, the conclusion may not carry over.
Other Documents You’ll See in the Same Database
The written determinations page contains more than PLRs. Two other document types show up often enough to matter.
A Technical Advice Memorandum is guidance from the Office of Chief Counsel issued at the request of an IRS field examiner or appeals officer during an audit or other proceeding. A taxpayer initiates a PLR before or shortly after a transaction; a TAM addresses a question that came up while the IRS was already reviewing a return. TAMs deal only with completed transactions and represent the IRS’s final position on the specific issue in that specific case. The format mirrors a PLR.
Chief Counsel Advice memoranda also appear. These are written advice from the Office of Chief Counsel to IRS field personnel on legal questions in tax administration. Like PLRs and TAMs, they aren’t precedential, but they reveal how the agency reasons about particular issues.
What Legal Weight a PLR Carries
Section 6110(k)(3) of the Internal Revenue Code is blunt: a written determination “may not be used or cited as precedent.” No other taxpayer can point to a favorable PLR and force the IRS or a court to follow it. The IRS itself isn’t bound by a PLR when dealing with anyone other than the original requester.
For the taxpayer who requested it, a PLR is binding on the IRS as long as the transaction was described fully and accurately and then carried out as described. That certainty is the whole reason people pay for these rulings before entering complex transactions.
Substantial Authority for Penalty Protection
Where PLRs punch above their non-precedential label is in penalty protection. Under IRC Section 6662, the IRS can impose a 20% accuracy-related penalty when a taxpayer substantially understates income tax. One defense is showing “substantial authority” for the position taken on the return. Treasury Regulations at 26 CFR 1.6662-4(d)(3)(iii) list what counts as authority, and private letter rulings issued after October 31, 1976 are explicitly on that list, even rulings issued to someone else.
The substantial authority standard is objective. It doesn’t matter whether you knew about the PLR when you filed. What matters is whether the authorities supporting your position, weighed against those cutting the other way, are strong enough. A favorable PLR on facts similar to yours doesn’t guarantee you clear the threshold, but it adds real weight to your side. This is one of the main reasons practitioners mine the database in the first place: not to cite rulings as binding precedent, but to build a body of authority that reduces penalty exposure.