My pleasure. Yes, in fact, CPP is a contributory-based scheme. Once you're in the system, you will get your cheques right through to the very end.
GIS is re-evaluated every year. The reason it's re-evaluated every year is that there are conditions of eligibility, the largest one being income. So we have to make sure that you're still within the income ranges we describe.
Marital status will also change it. You get a larger benefit if you're a single individual. So if your spouse or partner has died, we need to know that so we can increase the value of the benefit.
As I also mentioned, residency is important. If somebody has left the country, we don't send those benefits outside of Canada. So that's the reason.
I will also say, as I've said a couple of times, if somebody files their tax return, it is essentially an automated process. We will take care of it all in the background for them as long as they fill out their tax return.