A spouse can apply for a dependent visa by linking their application to the main applicant’s visa, such as a Partner Visa (Subclass 309/100), Student Visa (Subclass 500), or Skilled Visa (Subclass 482 or 186). You must create an account on ImmiAccount, complete the relevant form, upload required documents (proof of marriage, identity, financials, and police checks), and pay the applicable fee. Canadian residents can apply online and attend biometrics and medical appointments in Canada before the visa decision.