A last name mismatch with the IRS commonly occurs when the name on a tax return does not match records at the Social Security Administration (SSA), often due to non-updated name changes from marriage/divorce, spelling errors, typos, or hyphenation issues. The IRS uses the first four letters of a last name for matching.
Sometimes when the IRS has determined there is a mismatch, it is because the taxpayer uses two last names and the "wrong" one is being identified on the tax return as the last name.
See this IRS webpage for more information about name matching issues and how to resolve them.
You can choose to mail in your tax return if the IRS rejected it for a name spelling error, but it is generally faster to correct the spelling in your software and resubmit for e-file.
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