Interjurisdictional Support Orders in Ontario: Enforcing Support Across Borders

When the parent who owes — or is owed — child or spousal support lives outside Ontario, the usual domestic tools don't automatically reach them. An interjurisdictional support order (ISO) is the mechanism Ontario provides for exactly this situation: it lets a support claim cross provincial, territorial, or even international lines through a formal, court-supervised process, rather than requiring you to start a lawsuit in a foreign court on your own.

The process exists because Ontario's courts have no direct power to compel someone living in another province or country to pay. Instead, Ontario cooperates with a network of "reciprocating jurisdictions" — other provinces, U.S. states, and countries that have agreed to recognize and act on each other's support applications. If you're trying to establish, change, or collect support from someone who has moved away, understanding how the pieces fit together will save you a lot of frustration.

This guide explains who uses the ISO process, how an application moves from Ontario to another jurisdiction, and what it can and can't accomplish.

When You Need an Interjurisdictional Support Order

You may need this process if:

• The person who should be paying support has moved to another province, territory, or reciprocating country, and you need a new support order against them
• An existing Ontario support order needs to be enforced against someone who no longer lives in the province
• Circumstances have changed and an order needs to be varied, but the paying or receiving parent now lives elsewhere
• You live outside Ontario and need a support claim heard against someone who lives here — Ontario acts as the receiving jurisdiction in these cases

The process is set out in Ontario's Interjurisdictional Support Orders Act, 2002, which governs how Ontario courts and its designated authority work with equivalent authorities in other places.

How the Process Works

1. You start with an application, not a foreign lawsuit. Rather than hiring a lawyer in the other jurisdiction, you complete an ISO application through Ontario's designated authority, setting out what you're asking for along with financial and family information.
2. Ontario forwards the application. Once your paperwork is complete, it's transmitted to the equivalent authority in the reciprocating jurisdiction where the other party lives.
3. The other jurisdiction takes over. That jurisdiction's own court process considers the application, often without requiring you to travel or appear in person.
4. An order is made or registered. The receiving jurisdiction either issues a new support order or registers and gives effect to Ontario's existing order under its own laws.
5. Enforcement follows local rules. Once in place, the order is enforced using whatever tools exist in the jurisdiction where the paying parent actually lives.

Reciprocating Jurisdictions

Ontario can only use this streamlined process with places that have a reciprocal arrangement in place. Broadly, these fall into three groups:

• Other Canadian provinces and territories
• U.S. states and certain other sub-national jurisdictions with a reciprocal agreement
• A number of other countries that have entered into reciprocal support arrangements with Canada or Ontario specifically

The list of reciprocating jurisdictions, and the exact procedure each one uses, can differ from place to place and can change over time. Confirm current status with your lawyer or Ontario's designated authority before assuming a particular country or state is covered.

What an ISO Application Can — and Can't — Do

Where Enforcement Happens

Ontario's Family Responsibility Office (FRO) plays a role on both sides of these cases: it can act as Ontario's designated authority for outgoing applications, and it enforces support owed to Ontario recipients once an order exists here. Once an order is registered in another jurisdiction, though, day-to-day enforcement generally shifts to that jurisdiction's own equivalent agency, working within its own laws.

Frequently asked questions