Thanks Megapint , but for those I saw, including most recent ( https://www.canadavisa.com/canada-immigration-discussion-board/goto/post?id=10168768 ) they have not specified dates for application period. Rather seems they are asking for CURRENT proof of income.Income proof shows if indeed you were on the payroll during application and could also show if it exist in NOC classification https://noc.esdc.gc.ca/.
Remember the job must have been a paying job meaning you cannot be a volunteer. From my understanding the officer will be specific on which dates the income is required. For some you may require both paystub and income tax acknowledgement. Each case is different. If i changed jobs and its not clear which months officer want paystub, I'd rather put LOE and explain when i changed jobs and attach both paystubs from previous job[when i applied TR PR] and current job [If i have new employer]
See this link for related info >> https://www.canadavisa.com/canada-immigration-discussion-board/threads/2021-tr-to-pr-pathway-aor-timelines-join-here.731318/post-9968485
Kind of confused.