Yes, you will include your pay received on 12/31 on the 2019 tax return.
If this was your only job of the year and you had no other income, you may not need to file a return at all. If you earned less than your standard deduction ($12,200 if you are single), then you would not need to file a return. However, if your employer withheld taxes from your pay or if you are eligible for the Earned Income Tax Credit, then you may still want to file to get a refund.
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