Opening your mailbox and seeing an IRS notice can feel like your stomach just dropped. In 2026, more taxpayers are reporting unexpected IRS correction letters tied to “math errors,” refund adjustments, or return mismatches. In many cases, these notices are not full audits, but they can still affect refunds, balances due, and response deadlines. The growing wave is catching filers off guard, especially people who filed early, claimed credits, or earned income from multiple sources.
