IRS Letters and Forms
Notice code 603

Notice code 603 (Default) — We have disallowed the amount claimed as First- Time Homebuyer Credit on page 2 of your tax return. …

What this IRS notice code means, and what to check before you reply.

What to do next

Start with these steps before you reply.

603

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 have disallowed the amount claimed as First- Time Homebuyer Credit on page 2 of your tax return. According to the date of purchase you provided, your house is not eligible for the credit.

What it usually means

603 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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