A trust may be considered a master trust if it makes an election to that effect (by enclosing a letter with the return for its first taxation year). It must also fulfill the following conditions from the time of its creation:
A trust that makes such an election is exempt from income tax and is not required to file the trust return for subsequent taxation years.
For further information, refer to the Guide to Filing the Trust Income Tax Return (TP-646.G-V).