Adding Family to a Subclass 400 Application in 2026: Timing and Documents

Yes — on a pending Subclass 400 application, family members can be added at any time before the Department decides it. That is the position stated on the Australian Department of Home Affairs' official page for the Temporary Work (Short Stay Specialist) visa (Subclass 400), as of the August 2026 version of that page. The cut-off is the decision itself, not the date you originally lodged. What matters in practice is who qualifies as family, what each person has to file, and the extra consent and guardianship rules that apply when the person being added is under 18.

When exactly can a family member be added?

There are two points at which family can come into the application. You can include Members of the family unit in your application when you first apply, and the same official page repeats the position in its post-lodgement steps: you can add family members to your application at any time before the Department decides on it.

Adding late is not a separate application. The Department's own steps say family applications are processed together, and they add two mechanical conditions: each family member must have their application charge paid, and documents must be attached to their application. If you did not attach everything at lodgement, the instruction is to attach further documents in ImmiAccount as soon as you can.

One constraint travels with any late addition. The Department states that you must be outside Australia when you apply and when it makes a decision, and its application steps state that you and anyone included in the application must be outside Australia both when you apply and when the application is decided. So adding a family member who is currently in Australia is not simply a paperwork question — it affects whether the application can be decided at all.

Does adding family slow the decision down?

No fixed add-on period is published for adding a person. What the official page does say is that an application can take longer to process when it is not filled in correctly, when documents are missing or the Department needs more information, or when verification of information takes time. The visa processing time tool is described as showing times for recently decided applications, as a guide only and not specific to your application, and the Department says it cannot give status updates within the standard processing time.

That shifts the timing risk onto document quality rather than the act of adding someone. Late additions are exactly the situation where documents arrive after lodgement, so the useful discipline is to upload the full set at once rather than in dribs and drabs. The Department also says not to arrange travel to Australia until it has told you in writing that the visa is granted — a point worth weighing before booking flights for a larger group.

Who counts as family on a Subclass 400 application?

The official page defines it narrowly for this visa:

Person	Relationship basis	Extra conditions carried
Partner	Married or de facto partner of the main applicant	No work or study in Australia, except a language training program
Dependent child or stepchild	Dependent child of the main applicant, or stepchild of the main applicant (child of the partner)	Same work/study limit; under-18 consent criteria apply
Partner's dependent children and stepchildren	Child of the partner	Same work/study limit; relationship runs through the partner

The list is limited to those three relationships; parents, siblings and other relatives are not named on the page. The Regulations-level criteria summarised for Subclass 400 (clause 400.311) frame the secondary applicant as a family member of the main applicant who applies together with the main applicant, which is consistent with the "processed together" instruction above.

Every added person also inherits the health and character requirements. The Department states that you and your family members who apply must meet its health requirements and character requirements, with the eligibility section specifying that family members aged 16 years and over must meet the character requirement. The Department will tell you if and when police certificates are needed, and if you did not complete health examinations before applying, it will tell you if it needs them.

What documents does a partner need?

For a partner, the official document list asks for identity documents, character documents, and documents about other relationships if applicable. Identity, per the general identity section, means the pages of a current passport showing photo, personal details and issue and expiry dates, plus a national identity card if they have one and proof of any change of name — a marriage or divorce certificate, change of name documents from an Australian registry of births, deaths and marriages or the relevant overseas authority, or documents showing other names used.

The relationship itself is proven in one of two ways: a current marriage certificate, or enough documents to prove a de facto relationship of at least 12 months before you apply. The page names four kinds of de facto evidence: joint bank account statements, billing accounts in joint names, joint leases or mortgages, and documents showing the partner lived at the same address as you. Because the 12-month window is expressed as running before the application, a relationship that only recently reached 12 months is worth checking against the current official wording before relying on it.

What documents does a child under 18 need, and whose consent is required?

For every dependant under 18 applying with you, the Department asks for the child's identity documents, proof of your relationship with them — a birth or marriage certificate — and the child's character documents if applicable. A stepchild fits the same pattern, with the relationship running through the birth or marriage certificate that connects the child to you or your partner.

Consent and guardianship sit one level below the document checklist. The criteria summarised from the Migration Regulations 1994 and the Department's PAM3 guidance add public interest criteria that bite only on applicants under 18: PIC 4012 on unaccompanied minors, PIC 4017 on guardian consent, and PIC 4018 on the best interests of the child being a primary consideration. The practical reading is that a child's file is not complete on identity and relationship evidence alone — consent from the parent or guardian also has to be evidenced. Assume an applicant adds a 15-year-old stepchild two weeks after lodging: the identity pages, the certificate linking the child to the partner, and evidence of the non-travelling parent's consent all have to land before the decision, or the file is incomplete in a way the document checklist alone does not surface.

This description covers published criteria only and is not advice on any individual situation; where the wording matters — a child travelling with one parent, or with a guardian who is not a parent — the current text on the Federal Register of Legislation and a qualified professional's reading of it should govern.

What does it cost, and what can added family members do in Australia?

The Department's page states that there is a charge for each family member who applies for the visa with you, and points to the Visa Pricing Estimator rather than publishing a figure in the page text. It also lists other possible costs for health checks, police certificates and biometrics. The same page records that from 1 July 2026 a lower visa application cost applies to eligible Pacific Island and Timor-Leste citizens lodging a valid application, and that family members are eligible for the lower cost, based on the passport of the primary applicant.

On activity, the rule is restrictive: any family members included in the application are not permitted to work or study in Australia, and the visa listing carves out only a language training program. The Regulations-level criteria (clause 400.312) express this as an intention not to undertake a course leading to a formal degree, other than language training.

On money, you must be able to show that you and your family have enough means to support yourselves while in Australia. The Department accepts evidence of funds such as an employment contract or bank statements, or a letter from a bank or financial institution stating your financial position, and says it can also consider allowances, accommodation and other help from your employer.

Two formatting rules catch out otherwise complete files: non-English documents need English translations, and the Department asks for scans or photographs in colour, clear, with each multi-page document saved as one file.

What if the decision is already made, or something in the application is wrong?

Before the decision, corrections go through Form 1023 Notification of incorrect answers, attached in ImmiAccount, and the Department asks to be told about changes such as contact details, marital or de facto status, the birth of a child, or a wish to withdraw. After the decision, there is nothing to add to; the page states that you cannot stay in Australia longer by extending this visa, and that the application charge is not refunded if the application is refused.

Frequently Asked Questions

Can I add my partner after I have already lodged my Subclass 400 application?

Yes. The Department of Home Affairs states on the Subclass 400 official page that family members can be added at any time before it decides the application. Each added person needs their own application charge paid and their own documents attached in ImmiAccount.

Can family be added after the Subclass 400 visa is granted?

No. The permission to add family runs only up to the point of decision, and the same page states that this visa cannot be extended to stay longer in Australia. Someone not included in the granted application would need to be assessed under a different visa.

Do added family members have to be outside Australia?

Yes. The Department states that you must be outside Australia when you apply and when it makes a decision, and its application steps extend that to anyone included in the application. A family member inside Australia at decision time is a problem for the whole application, not just their own.

Is a marriage certificate required to add a partner?

No, but one of two things is. The Department accepts either a current marriage certificate or enough documents to prove a de facto relationship of at least 12 months before you apply, such as joint bank statements, joint billing accounts, a joint lease or mortgage, or documents showing a shared address.

Can my spouse work or my child attend school on a Subclass 400 visa?

No. Family members included in the application are not permitted to work or study in Australia, and the only study carve-out named on the visa listing is a language training program. If schooling during the stay is the goal, this visa does not deliver it.

What extra rules apply when the person added is under 18?

Beyond identity documents, a relationship certificate and character documents if applicable, the Regulations-level criteria add public interest criteria specific to minors: PIC 4012 on unaccompanied minors, PIC 4017 on guardian consent, and PIC 4018 on the best interests of the child. In practice a child's file also has to evidence the consent of the parent or guardian.