The average American household receives approximately 17 pieces of mail per week. Most of it is marketing. But buried in that pile are documents that, if ignored, can result in late fees, legal action, damaged credit, or even eviction.
Here's how to tell the difference — and what to do when you spot the dangerous ones.
1. IRS and State Tax Authority Notices
Why it matters: Tax agencies are among the few creditors who can garnish your wages, levy your bank account, and file tax liens on your property — all without a court order.
Red flags to watch for:
- Any letter from the IRS, your state revenue department, or the Department of Treasury
- Phrases like "Notice of Deficiency," "Final Notice," or "Intent to Levy"
- A response deadline (always in bold, usually 30–90 days)
What to do:
- Note the deadline immediately
- Look up the notice number on the IRS website (e.g., CP2000, CP504, Letter 1058)
- Don't call the number on the letter if you're unsure it's real — go to IRS.gov directly
- Consult a CPA or tax attorney if the amount exceeds $1,000
2. Legal Notices and Court Summons
Why it matters: Ignoring a court summons results in a default judgment against you — meaning the court rules in favor of the other party automatically, without hearing your side.
Red flags:
- Words like "Summons," "Complaint," "Plaintiff," or "Defendant"
- A return date or court date
- A case number
- A sheriff's badge or court seal on the envelope
What to do:
- Do not ignore — you typically have 20–30 days to respond
- Contact a lawyer or legal aid society immediately
- Keep the envelope (the postmark matters for deadline calculation)
3. Landlord and Housing Notices
Why it matters: A "Pay or Quit" notice is the first step in the eviction process. Even if you've lived somewhere for years, certain notices begin legal timelines that move quickly.
Red flags:
- "Notice to Quit," "Pay or Quit," "Notice to Vacate," or "Unlawful Detainer"
- Any letter from a property management company's legal department
- Letters mentioning your lease violation
What to do:
- Know your state's tenant rights — timelines vary from 3 days to 30 days
- If you owe rent, pay or arrange a payment plan in writing within the notice period
- Keep a copy of all communication with your landlord
4. Insurance Denial and Cancellation Letters
Why it matters: A retroactive insurance cancellation means claims you thought were covered aren't. A policy non-renewal letter gives you a window to find new coverage before you're uninsured.
Red flags:
- "Notice of Cancellation," "Non-Renewal," or "Denial of Claim"
- A specific effective date for coverage termination
- Any letter from an insurance company after you've filed a claim
What to do:
- Check whether the cancellation is for non-payment or another reason — the response differs
- For claim denials, request the specific reason in writing and file an appeal
- Contact your state's insurance commissioner if you believe the denial is improper
5. Debt Collection Letters
Why it matters: If you don't respond to a debt collector within 30 days of their first letter, you lose certain legal rights — including the right to demand they verify the debt.
Red flags:
- Any letter from a company that isn't the original creditor
- Phrases like "Final Demand," "Debt Validation Notice," or "Settlement Offer"
- An amount that seems unfamiliar or inflated
What to do:
- Within 30 days of receiving the letter, send a written request for debt validation (via certified mail)
- Check your credit report — the debt may be past the statute of limitations in your state
- Never pay a debt you don't recognize without validation; it can restart the collection clock
The Common Thread
All five of these letter types share one characteristic: time-sensitive deadlines that get worse if missed. The letters themselves are dense, legalistic, and deliberately intimidating. Most people delay reading them because the prospect is stressful.
That delay is exactly what makes the situation worse.
PaperLens scans any of these letters and tells you the deadline, what it means, and what to do next — in plain English, in under 10 seconds. Try it free →