Signature – Who Can Sign the Form W-7: Generally, the applicant is required to sign Form W-7. The following are exceptions to this requirement.
a. Applicant is a dependent under 18 years of age. If the applicant is a dependent under 18 years of age, his or her parent or court-appointed guardian can sign if the child cannot. The parent or court-appointed guardian must type or print his or her name in the space provided and check the appropriate box that indicates his or her relationship to the applicant. If the individual is signing as a court-appointed guardian, a copy of the court-appointment papers showing the legal guardianship must be attached.
Adults, other than a parent or court-appointed guardian, can sign Form W-7 only if a Form 2848, Power of Attorney and Declaration of Representative, has been signed by a parent or court-appointed guardian authorizing the individual to sign for the applicant.
Applicant is a dependent 18 years of age or older. If an applicant is 18 years of age or older, the applicant or a court-appointed guardian can sign or appoint a parent or another individual to sign. The individual (if other than the applicant) must type or print their name in the space provided and check the appropriate box that indicates their relationship to the applicant. If the individual is signing as a court-appointed guardian, a copy of the court-appointment papers showing the legal guardianship must be attached. Individuals other than the applicant or a court-appointed guardian must attach a Form 2848 from the applicant or court-appointed guardian authorizing them to sign the Form W-7.
A spouse can’t sign for his or her spouse, unless the Power of attorney box is checked and Form 2848 has been attached to Form W-7..
Applicant can’t sign their name. If an applicant can’t sign his or her name, then the applicant must sign his or her mark (for example, an “X” or a thumbprint) in the presence of a witness. The witness’s signature is also required and must be identified as that of a witness.
Note. All Powers of Attorney (POAs) submitted to the IRS must be in English. Any POAs received in a foreign language will be considered invalid unless accompanied by a certified English translation. The POA must clearly state the purpose for which it’s intended under the Acts authorized section. For more information, go to IRS.gov.