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Notice code 18
Notice code 18 — The tax reported on Line 11 of Part I did not match the amount reported on Line 4 of Schedule G. Lin…
What this IRS notice code means, and what to check before you reply.
What to do next
Start with these steps before you reply.
18
Read the notice carefully and note any deadline. Gather returns, notices, and payment records. Book a free strategy session before responding if the amount is large, unclear, or collection language appears.
What the IRS language says
The tax reported on Line 11 of Part I did not match the amount reported on Line 4 of Schedule G. Line 11 of Part I and line 4 of Schedule G must match exactly.
What it usually means
18 is in our IR Manual catalog. Official wording is dense — we translate it for business owners and individuals and map realistic next steps.
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