If a certified letter arrives at your door, the contents almost certainly carry a deadline. The documents that come as certified mail are overwhelmingly the kind with legal or financial consequences: IRS notices, court summonses and subpoenas, foreclosure warnings, debt collection letters, insurance decisions, lease and HOA notices, and other official communications where the sender needs proof you received it. Nobody pays extra postage to send you something optional.
IRS and State Tax Notices
The IRS is one of the heaviest users of certified mail, and for some notices federal law requires it. A statutory notice of deficiency, often called a “90-day letter,” must go out by certified or registered mail.1GovInfo. 26 USC 6212 – Notice of Deficiency It tells you the IRS believes you owe more tax and gives you 90 days to challenge the amount in Tax Court before the agency can assess it. Miss that window and you lose the right to dispute the tax before paying it.
Collection due process notices are also sent certified or registered, at least 30 days before the IRS can levy your bank accounts, wages, or other property.2Office of the Law Revision Counsel. 26 USC 6330 – Notice and Opportunity for Hearing Before Levy The notice explains your right to request a hearing, and that deadline is firm. State tax agencies follow similar practices for their own disputes, with the specifics varying by state.
Court Documents and Legal Papers
Courts and attorneys rely on certified mail for anything that starts a clock. The most common items include:
- Summons and complaints announcing that a lawsuit has been filed against you. Many jurisdictions allow service of process by certified mail as an alternative to a process server.
- Subpoenas ordering you to appear at a proceeding or produce documents.
- Eviction notices, which state landlord-tenant statutes commonly require or allow to be sent certified.
- Notices of intent to sue, required in some contexts as a pre-litigation step so the recipient has fair warning.
Ignoring court-related certified mail does not stop the case. If you were properly served and don’t respond, the court can enter a default judgment against you.
Foreclosure and Mortgage Default Notices
Fall behind on a mortgage and certified mail will follow. Federal law requires notices of default and foreclosure sale for federally insured mortgages to be sent by certified or registered mail to the property owner, all borrowers on the loan, and anyone holding a lien on the property.3Office of the Law Revision Counsel. 12 USC 3708 – Service of Notice of Default and Foreclosure Sale The notice must go out at least 21 days before the foreclosure sale date, and under federal law it is considered legally delivered once mailed, whether or not you actually receive it or sign the return receipt.
Many states layer their own pre-foreclosure notice rules on top of the federal ones, often with longer timelines or additional certified mailings. This is one of the clearest situations where not picking up your certified mail can cost you a house.
Debt Collection Letters
Debt collectors are not required by federal law to use certified mail for their initial contact or the validation notice that must follow. The Fair Debt Collection Practices Act sets the timing and content of that notice but not the mailing method. Many collectors use certified mail anyway, because it creates a delivery record they can point to if you later claim you never got it.
Watch the 30-day dispute window described in the notice. Within that period, you can request written verification of the debt, which forces the collector to pause collection activity until they provide proof. If you send a dispute letter, use certified mail yourself so you have your own record.
Business, Insurance, Landlord, and HOA Notices
Private businesses and property managers reach for certified mail when they need proof you received something. Common examples:
- Contract termination notices, since many contracts require written notice with proof of delivery.
- Insurance claim decisions, including denial letters, cancellation notices, and settlement offers, particularly when appeal deadlines apply.
- Landlord notices, such as lease violation warnings, rent increase notifications, and non-renewal letters.
- HOA violation and lien notices documenting that a property owner was told about fines, assessments, or a lien filing.
The common thread is a deadline or a legal right at stake.
What to Do When Certified Mail Arrives
The carrier will try to get a signature at delivery. If no one is home, they leave a PS Form 3849 notice with a tracking number and instructions. From there you can schedule a redelivery online using the tracking number, or pick the item up at your local post office. Requests submitted by 2:00 AM Central Time on a weekday are eligible for same-day redelivery.4USPS. Schedule a Redelivery Move quickly. USPS holds certified mail for a limited period, typically around 15 days, before returning it to the sender as unclaimed.
What Happens If You Refuse or Ignore It
Refusing to sign or letting the letter sit unclaimed does not make the underlying problem go away. Courts in most jurisdictions recognize a legal presumption that properly mailed items are received. When a sender can produce certified mail tracking showing delivery was attempted at your address, many courts treat that as sufficient notice even without your signature.
The practical consequences depend on what was inside. If it was a court summons, the sender may re-serve you by regular mail or through a process server, and the case moves forward whether you participate or not. If it was an IRS notice of deficiency, the 90-day clock to petition Tax Court runs from the mailing date, not the date you decide to open the envelope.1GovInfo. 26 USC 6212 – Notice of Deficiency If it was a foreclosure notice on a federally insured mortgage, federal law states the notice is legally effective upon mailing regardless of whether you actually receive it.3Office of the Law Revision Counsel. 12 USC 3708 – Service of Notice of Default and Foreclosure Sale
Pick it up. Open it. Whatever is inside, you are better off knowing while you still have time to respond.
Certified Mail Is Not Registered Mail
People sometimes mix up certified and registered mail, but they answer different needs. Certified mail proves delivery of documents; it travels through the postal system as ordinary mail with no special physical security and no insurance, and the only enhancement is the tracking and delivery record.5PostalPro. Certified Mail Guidebook Registered mail physically secures valuable items in locked containers and safes with a documented chain of custody, and it includes insurance covering up to $50,000 in declared value. That is why certified mail carries legal documents while registered mail carries jewelry, cashier’s checks, and other items with intrinsic monetary value. If your certified letter is inside a plain envelope with a green sticker or bar-coded label, it is the document-proof kind, and something inside is waiting for a response.