Got a letter from the IRS? Here is what to do first.

Open it and read it the same day. Most IRS letters ask a question or point out a mismatch, and most give a date to answer by. Missing that date is usually what turns a small letter into a big problem.

Is it really from the IRS?

The IRS normally contacts you first by mail. It does not start contact by email, text message or social media. If a call, text or email says it is the IRS and demands payment right away, treat it as a scam and do not reply.

To check a letter, look for it in your IRS online account, or compare it with the notices listed on irs.gov. If you call, use the phone number on the IRS website, not one printed in a message you are unsure about.

What does the letter want?

Look for three things: the notice number in the corner, what the IRS thinks is different, and the date it wants an answer by. Many letters only need a short reply with a document attached. Some just confirm a change and need nothing from you.

Keep a copy of anything you send back, and write down the date you sent it. If you reply by mail, a delivery receipt is worth the small extra cost.

Should you pay it right away?

Not until you know it is correct. If the letter says you owe more, check the figures against your return first. If you agree, pay by the date shown. If you do not agree, the letter explains how to respond, and you are allowed to do that.

When should you call us?

Call us if the letter mentions an audit. Call us too if you are not sure what it is asking, or if the amount does not match anything you recognize. Bring every page of the letter with you.