The 2020 tax return filed in 2021 showing 2020 income is currently the most recent tax return
One recent pay stub is fine as evidence of current income.
No worries regarding bonuses. As long as the income stated is comfortably over the required amount, it's fine. They can see the past income is actually MORE than the stated income. It's not a problem.
Not required to file a tax return is not a problem. Being required to and not filing is a problem.
Lots of members here have been in the same situation but may not be reading and replying. More important is to get the right answers from somebody who actually knows. ?