A consumer proposal will end (by law) if you fall behind by a total of three payments.
Before you miss that third payment, you should speak with your LIT and he/she can see if an amended offer can be made to your creditors. If you have been honest and making payments and the reason for not being able to continue are understandable, your creditors may accept the change. A few of the changes that can happen (there are many) include: deferring payments for a few months, reducing payments for a few months (sometimes with catch-up payments).
When you fall behind by three months, the proposal is automatically deemed annulled, and your creditors can resume collection actions, including interest charges, legal action, or wage garnishments.
But if you have been honest and in contact with the LIT he/she can recommend to your creditors that they allow the CP to be revived. Speak with your LIT about details.
The key here is to communicate with your LIT when things go wrong – the sooner the better.
If your proposal fails (cannot be amended or revived), you can explore other debt relief options, like filing a new proposal or considering bankruptcy.