Most IRS deadlines start with a piece of mail. The 90-day window to petition the Tax Court starts when a notice of deficiency is mailed. The 30-day period before a levy runs from a notice the IRS sends by certified mail. And the law says many of those notices are good if they were mailed to your last known address, whether or not you ever opened them.
That makes your address a deadline issue. If the IRS has the wrong address, a clock can start and finish without your knowing. If the IRS used an address that was not legally your last known address, the notice may not have started anything. This guide covers how the rule works and how to keep it working for you.
Where the rule comes from
Section 6212(b)(1) of the Internal Revenue Code says that a notice of deficiency for income tax, gift tax and certain excise taxes, if mailed to the taxpayer at his last known address, is sufficient, even if the taxpayer is deceased, under a legal disability or, for a corporation, has terminated its existence. Section 6212(b)(3) applies the same idea to estate tax notices addressed to the decedent's last known address.
The phrase appears elsewhere too. Section 6331(d)(2)(C) allows the pre-levy notice to be sent by certified or registered mail to the taxpayer's last known address. Section 6901(g) makes a notice of transferee liability sufficient if mailed to the last known address of the person subject to the liability.
And the regulation that defines the term applies broadly. Treasury Regulation 301.6212-2(c) says its rules determine whether all notices, statements or other documents are mailed to a last known address whenever the term is used in the Code or regulations.
What counts as your last known address
Treasury Regulation 301.6212-2(a) sets the general rule: your last known address is the address on your most recently filed and properly processed federal tax return, unless the IRS is given clear and concise notification of a different address. The regulation points to Rev. Proc. 90-18, or later procedures prescribed by the Commissioner, for what counts as clear and concise notification and as a properly processed return.
Notice the words properly processed. Filing a return with a new address does not instantly change the address on file. The return has to be processed. A notice prepared and mailed in the gap between your filing and the IRS processing can still go to the old address and still be valid.
The Postal Service exception
The regulation adds a twist. Under Treasury Regulation 301.6212-2(b)(2), the IRS updates addresses using the U.S. Postal Service National Change of Address database. If your name and last known address in IRS records match the name and old address in that database, the new address in the database becomes your last known address, unless you give the IRS clear and concise notification of a different address.
That address stays your last known address until you file and the IRS properly processes a return with a different address, or you give the IRS clear and concise notification of a change.
The regulation's own examples show the timing problem. A taxpayer files a forwarding order with the Postal Service, and the IRS records update a couple of weeks later. A notice prepared before the update goes to the old address and is still mailed to the last known address. A notice prepared after the update goes to the new one.
Telling someone else is not telling the IRS
Treasury Regulation 301.6212-2(b)(1) is blunt: except for the Postal Service rule, change of address information you give a third party, such as a payor or another government agency, is not clear and concise notification of a different address.
Updating your address with your employer, your bank, the Social Security Administration or your state motor vehicle office does not update it with the IRS. People are surprised by this every year.
How to change it properly
The IRS form for this purpose is Form 8822, Change of Address, which the IRS describes as the form used to notify it of a change to your home mailing address. Businesses use Form 8822-B, Change of Address or Responsible Party, Business.
Filing a return with the new address also works once the return is properly processed. If you are in the middle of an audit or expecting a notice, do not wait for the next return. File Form 8822, keep proof of when you sent it and tell your representative.
If you have a representative with a power of attorney, ask for copies of notices to go to that person as well. That does not change your last known address, but it adds a second set of eyes on the mail.
Joint filers who separate
Section 6212(b)(2) allows the IRS to send a single joint notice of deficiency for a joint return. But if either spouse has notified the IRS that separate residences have been established, the IRS must send a duplicate original of the joint notice by certified or registered mail to each spouse at his or her last known address.
That is a reason for each spouse to notify the IRS of a separate address after separation. Otherwise the notice for a jointly filed year may go only to the address on the last joint return, and the spouse who moved may never see it.
Why this is a statute of limitations issue
A notice of deficiency suspends the assessment statute when it is mailed. The guide on notices of deficiency explains how. If the notice was validly mailed to your last known address, the suspension applies even if you never received it, and the 90-day petition period runs on schedule.
If the notice was not mailed to your last known address, its validity can be challenged, and with it the suspension of the three-year assessment period. In a case near the deadline, that can be the difference between a valid assessment and a time-barred one. Address disputes are fact disputes: what was on the most recent processed return, what notifications were sent and when, what the Postal Service database showed.
On the collection side, the levy notice under section 6331(d) and other collection notices sent to the last known address trigger rights with short deadlines. Missing them because the mail went to an old address does not stop the clock.
Protecting yourself
- File Form 8822 whenever you move, and do not rely on the Postal Service database or a third party to update the IRS.
- Keep proof of mailing for the Form 8822, ideally by certified mail.
- If you separate from a spouse you filed jointly with, notify the IRS of your separate address.
- Set up forwarding with the Postal Service anyway, since the IRS may pick up the new address from that database.
- If you learn of a notice late, check the address it was mailed to against your filing and notification history before you assume the deadline has passed.
The bottom line
Address problems are easy to prevent and expensive to fix after the fact. A five-minute Form 8822 can save a year of arguing over whether a notice was valid.
The IRS can rely on your last known address for deadline notices: the address on your most recently filed and properly processed return, unless you gave clear and concise notification of a different one, with the Postal Service database rule layered on top. Telling a third party does not count. Form 8822 does. Keep the IRS current, because the clock does not care whether you got the mail.