The IRS gives no guaranteed timeline for issuing an estate tax closing letter and states plainly that “issuance date estimates are not possible.” As a practical answer to how long it takes to get an estate tax closing letter: plan on waiting at least nine months after filing Form 706 before you can even submit the request, and then several more weeks to several more months after that before the letter arrives. Returns pulled for examination wait considerably longer, since the letter cannot issue until the audit closes.
Why You Have to Wait Nine Months Before Requesting
The IRS asks executors not to submit a closing letter request through Pay.gov until at least nine months have passed since Form 706 was filed. That window exists because the IRS typically decides within six to nine months of filing whether to audit the return. Requesting sooner does not speed anything up; the request simply sits in the queue and gets revisited later.
There are two situations that change the nine-month rule. If the return is under examination, wait at least 30 days after the examination concludes before requesting. And if you have already confirmed that transaction code 421 (TC 421) is posted on the estate’s account transcript, you can submit the request at any time, since TC 421 signals the IRS is done with the return.
One more preliminary point on timing: closing letters are not automatic. The IRS stopped mailing them by default on June 1, 2015. For any Form 706 filed on or after that date, no request means no letter, regardless of whether the return was filed to pay tax or only to elect portability.
What Happens After You Submit the Request
Once Pay.gov transmits the request and the $56 user fee to the IRS, the agency typically begins researching the estate’s account within about three weeks. The first thing the IRS looks for is TC 421 on the transcript.
If TC 421 is already posted, the request moves into production, review, and issuance. That stage alone takes several additional weeks. If TC 421 has not posted yet, the IRS rechecks the transcript roughly every 60 days until it does. Only then does the letter enter the production queue. This staged process is why the IRS refuses to commit to a delivery date. Returns that clear without examination often produce a letter within a few months of the request. Returns picked up for audit wait until the exam wraps.
What Stretches the Timeline
Examination is the single biggest factor. Once selected, an audit can run months or longer depending on the estate’s complexity. Hard-to-value assets draw the most scrutiny: closely held business interests, real estate, and limited partnership interests. Larger estates face significantly higher audit rates than smaller ones. The nine-month, six-to-nine-month, and 30-day markers all revolve around this examination cycle.
Other things that add delay:
- Errors or missing information on Form 706, which trigger correspondence rounds that add weeks each.
- Unpaid tax balances, which prevent the IRS from closing the case at all until resolved.
- Requests submitted before the nine-month mark, which sit in the queue and get revisited on the 60-day cycle rather than moving forward.
- An outdated executor address on file, since the letter is mailed to whatever address the IRS has. File Form 8822 to update it before you expect the letter.
Checking on a Pending Request
The IRS will only discuss a pending request once two thresholds are met: the request was submitted at least nine months after Form 706 was filed, and at least 120 days have passed since the Pay.gov submission. Before both of those, calling won’t help.
Once you’re past the 120-day mark, call the IRS estate and gift tax line at 866-699-4083. Have ready the decedent’s name and Social Security number, the date of death, and your Pay.gov transaction date and tracking ID from the confirmation email.
A Faster Alternative: The Account Transcript
You may not need to wait for the formal letter at all. Under IRS Notice 2017-12, an account transcript showing TC 421 serves as the functional equivalent of a closing letter. TC 421 means “Closed examination of tax return” and independently confirms the IRS has finished reviewing the Form 706.
Tax professionals registered with the IRS can pull account transcripts instantly through the Transcript Delivery System (TDS) on IRS.gov. Executors and authorized representatives can request a hardcopy transcript by mail or fax using Form 4506-T. Many probate courts, title companies, and financial institutions accept a transcript with TC 421 in place of the letter. If your goal is to satisfy a third party rather than to have the letter itself, this route can save weeks or months.
The IRS still recommends waiting at least nine months after filing Form 706 before pulling the transcript, since the audit decision typically happens in that window. For examined returns, allow at least 30 days after the examination closes for TC 421 to post.
Requests Submitted Before October 28, 2021
If you asked for a closing letter under the old pre-Pay.gov process before October 28, 2021, and it never arrived, that request is no longer in the queue. You need to submit a fresh request through Pay.gov and pay the current $56 fee. The same timing rules apply: at least nine months after the original Form 706 filing, unless TC 421 is already posted on the transcript, in which case you can submit right away.
A Realistic Estimate
Put together, a straightforward estate with no examination and a clean return is looking at roughly nine months of mandatory wait, then a few weeks for IRS research after the Pay.gov submission, then several more weeks in the production queue. Somewhere in the range of a year from filing Form 706 is a reasonable working expectation. Add the length of any examination on top of that if the return is selected. If you need proof of closure sooner and a third party will accept it, an account transcript showing TC 421 is the faster path.