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Notice code 600
Notice code 600 (Default) — We changed the amount claimed for Standard Deduction on your tax return. The error was: in the com…
What this IRS notice code means, and what to check before you reply.
What to do next
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600
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
We changed the amount claimed for Standard Deduction on your tax return. The error was: in the computation of the total amount on Schedule L, or the transfer of the total amount from Schedule L to your tax return.
What it usually means
600 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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