Why this matters
Some notices require a response, while others are informational. The IRS instructions on the specific letter explain where to reply and what evidence to provide. Ignoring a deadline can limit options.
Example
If a notice says a payroll deposit is missing, compare the stated quarter with the bank confirmation and tax account transcript before sending a duplicate payment.
What to review
Keep the complete notice, mailing date, return copy, payment confirmation and correspondence. Use the reply address or method on that notice.
Official source: www.irs.gov/individuals/understanding-your-irs-notice-or-letter