Third party notice (Rule 203(1)(c)) (Form 18)
Form 18 is the Supreme Court of Tasmania third party notice. A defendant uses it to join someone who should indemnify them or contribute to the plaintiff's claim.
Word document from Supreme Court of Tasmania's website.
DraftOur fillable copy of this form has not been through editorial review yet. Check it against Supreme Court of Tasmania's current form before you rely on it.
- Format
- Word (DOCX)
- Category
- Court form
- Form number
- Form 18
- Version
- v7e785cf0
- Last verified
- 3 October 2026
Supreme Court of Tasmania · Supreme Court Rules 2000; Supreme Court Forms Rules 2000

For law practices: this form maps to the published matter-field vocabulary, so your practice management system fills it from your matter data - on your own machine. Practice management systems can fetch and assemble it through the document assembly API.
What Form 18 is for
Under rule 202 of the Supreme Court Rules 2000 (Tas), a defendant who claims to be entitled to contribution or indemnity, or other relief connected with the subject of the action, from a person who is not already a party may file and serve a third party notice on that person. Rule 203 says what it must contain and requires it to be in the prescribed form, which is Form 18. Once served, the third party becomes a party to the action (r 204). If the third party does not appear, it is taken to admit the validity of any judgment in the action and its own liability as claimed (r 206).
When you need it
- You are a defendant and claim that a non-party must indemnify you, or contribute to whatever you have to pay the plaintiff.
- Without leave, file it within 30 days after delivering your defence; at any other time you need the Court's leave (r 202(2)).
- Against a person who is already a co-defendant, serve a notice under rule 211 instead. No appearance is needed to that notice.
How to fill it in
- 1
Heading and filing date
Copy the heading from the action. The registry inserts the filing date.
- 2
Third party
Insert the third party's name and address.
- 3
Paragraph 2: the claim
Use the indemnity version or the contribution version (with the proportion claimed), identify which defendant is claiming if there is more than one, and set out the grounds. Rule 203(1)(a)-(b) requires the nature and grounds of the claim and the relief sought.
- 4
Paragraph 3: costs
State the extent of any claim to be indemnified against the plaintiff's costs, and the claim for the costs of the third party proceedings.
- 5
Paragraph 4: days for appearance
Insert the appearance period. It must not be less than a defendant would get on a writ: 7 days in Tasmania or 21 days elsewhere in Australia (r 203(1)(d), r 98, r 99).
- 6
Date and address for service
Date it and give the name and address for service of the defendant's practitioner, or of the defendant in person.
Filing, lodging and service
- Lodge the notice at the registry with as many copies as you need sealed (r 203(1)(e)).
- Serve it as if it were a writ, usually personally (r 203(2), r 133), with a copy of the writ and of any pleadings delivered in the action (r 203(3)).
- The third party files a notice of appearance within the period in the notice and serves it on the defendant (r 205).
Common mistakes
- Diary the 30-day limit from delivering your defence. After that you need leave (r 202(2)(b)).
- Once the third party appears, any party can seek directions about how the third party claim will be tried (r 208).
- Execution cannot issue against a third party without leave until the defendant has satisfied the judgment against it (r 209(3)).
Frequently Asked Questions
When can a defendant issue a third party notice in the Tasmanian Supreme Court?
Without leave within 30 days after delivering the defence, and at any other time with the leave of the Court or a judge (r 202(2)).
What happens if a third party ignores the notice?
It is taken to admit the validity of any judgment in the action and its liability for the contribution or indemnity claimed (r 206). The defendant may enter judgment against it in the circumstances in rule 207.
Checked against the official sources on 26 October 2026
- Supreme Court Rules 2000 (Tas) Part 7 Division 15 (rr 201-212), rr 98, 99, 133
- Supreme Court of Tasmania - Form 18 Third party notice
General information about the form, not legal advice about your matter. Rules and forms change: if anything here differs from the court or agency's current instructions, theirs apply.
Field map
3 boxes on the Third party notice (Rule 203(1)(c)) (Form 18) fill from your matter.
- Client
- Client full name(s)
- Matter
- Matter / file reference
- Key Dates
- Current date
Matter plans that use this form
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