Why is my dependent's last name important?

The IRS compares your dependent's Social Security number with your dependent's last name. If the two don't match their records, then they'll reject your e-filed tax return.

The IRS gets its information from the Social Security Administration, so you need to use the last name shown on your dependent's Social Security card. If you're uncertain which last name to enter for your child, go to the Social Security Administration website, or call 1-800-772-1213 to find which name is recorded on your dependent's social security records.

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