Thank you, I should have been clearer.
My question is my wife has not filed taxes for the last 3 years since she had no income. However she has been working for the last 3 months in the US and has paystubs/job offer letter for that time. Is that sufficient documentation for I-864 or is it likely they may ask for assets/joint sponsor? At the NVC stage we only showed assets and we don't have a joint sponsor. But I believe Montreal is more strict about spouse moving back and working. We also have rental lease, bank statements, IRA accounts, voting history and kid's kindergarten application.
I'm thinking of taking 2 copies of I-864, one with just her income and one with income + assets if they ask for it. Her income is comfortably above the threshold, just the fact that we don't have tax returns for the last 3 years.