If a taxpayer takes their spouse's last name or if both spouses hyphenate their last names, they may run into complications if they don't notify the SSA. If the newlyweds file a tax return using their new last names, IRS computers would not be able to match the new name with their Social Security Number.
After a divorce, taxpayers who change back to their previous last name also need to notify the SSA of the change.
Informing the SSA of a name change is quite simple. File a Form SS-5 at your local SSA office. The form is available on SSA's Web site at www.socialsecurity.gov, by calling 800-772-1213 or at local offices. It usually takes about two weeks to have the change verified.
Taxpayers who adopt their spouse's child after getting married will want to make sure the children have an SSN. Taxpayers must provide SSNs for each dependent claimed on a tax return. For adopted children without SSNs, the parents can apply for an Adoption Taxpayer Identification Number -- or ATIN -- by filing Form W-7A, Application for Taxpayer Identification Number for Pending U.S. Adoptions with the IRS. The ATIN is a temporary number used in place of an SSN on the tax return. The W-7A is available on the IRS Web site, IRS.gov, or by calling 800-TAX-FORM (800-829-3676).
