Thank you for the question.
You've described the Canada disability benefit as an important measure for persons with disabilities. As for what's in this bill.... Under current law, Canada disability benefits would be treated in the same way as social assistance. The way that social assistance is treated for tax purposes is that it's in and then it's out. It's in for the purposes of calculating income-tested benefits, such as the Canada child benefit, but then it's taken out before tax. People don't pay tax on social assistance or on amounts that are considered social assistance, but it does affect the calculation of their income-tested benefits.
On what this measure is doing, it's in the spirit of making sure that those receiving the Canada disability benefit can benefit from the full amount. It will exempt the amounts completely, so they won't be included at all. They won't be in and out. It just means that in the first place, they won't be in, meaning they won't affect the calculation of entitlement to income-tested benefits, such as the Canada child benefit and several others.