Here is how a name change affects a 1040 tax return

When a taxpayer legally changes their name, there are tax consequences they need to know about, especially at tax time. People change their names for several reasons:
  • Taking their spouse’s last name after a marriage
  • Hyphenating their last name with their spouse’s after getting married
  • Going back to their former name after a divorce
  • Giving an adopted child the last name of their new family
The IRS wants people experiencing a name change to remember these important things: Reporting change to SSA: Taxpayers should notify the Social Security Administration of a name change ASAP. When a taxpayer files their taxes, the IRS checks SSA records to ensure names and social security numbers on the forms match.   Failing to report a name change: If a name on a taxpayer’s tax return doesn’t match SSA records, it can delay the IRS processing of that return. In that case, if the taxpayer is due a refund, it will take longer for them to get their money.   Name Change Due to Adoption: In the case of an adoption, if the child has a Social Security number, the taxpayer should be sure to inform the SSA of a name change. If the child does not have a Social Security number, the taxpayer may use an Adoption Taxpayer Identification Number on their tax return. An ATIN is a temporary number. Taxpayers can apply for an ATIN by filing Form W-7A, Application for Taxpayer Identification Number for Pending U.S. Adoptions. Taxpayers file this form with the IRS.   Getting a New SS Card: After a name change, a taxpayer should file Form SS-5, Application for a Social Security Card. The form is available on SSA.gov or by calling 800-772-1213. The taxpayer’s new Social Security card will reflect the name change.