ONTARIO HOME INTEL · LTB APPLICATION GUIDE
The Landlord and Tenant Board currently lists three A-series applications that can be relevant to landlords or tenants: A1, A2 and A4. They address different legal questions and are not interchangeable.
A1 – Application about Whether the Act Applies
An A1 asks the LTB to determine whether the Residential Tenancies Act applies to a particular rental situation. This can be important where the legal status of the occupancy itself is disputed or uncertain.
A2 – Application about a Sublet or an Assignment
An A2 addresses specified disputes involving a sublet or assignment. If your issue involves changing who occupies the rental unit, start with our Assignment vs Subletting guide before reviewing the current official A2 instructions.
A4 – Application to Vary the Amount of a Rent Reduction
An A4 concerns varying the amount of a rent reduction in the circumstances covered by the application. It is not a general application for challenging any rent increase or requesting an arbitrary rent reduction.
How these applications are filed
Tribunals Ontario currently lists A1, A2 and A4 as applications that may be filed by mail or courier, at ServiceOntario, or by email under the LTB’s current filing process. Do not assume every LTB application is filed through the Tribunals Ontario Portal.
Get the current official A1, A2 and A4 forms and instructions →
Related resources
- LTB Notice & Form Finder
- How to Break or Assign a Lease
- Assignment vs Subletting
- What to Expect at the LTB
General information only: Whether an A1, A2 or A4 is appropriate depends on the facts and the statutory issue being raised. Verify the current form, filing method and instructions with Tribunals Ontario. Last reviewed September 2026.