It depends if you had lump-sum payments reported for years prior to 2021. If not, enter "0" in that Box then enter 2020 as the year. If you have amounts reported prior to 2021:
- Pick year 2020.
- Enter the total amount shown for "Other Tax Years" under that specific year.
As long as your income in those "Other" years was similar, the calculation will be accurate. If the amount is small (under $300), the tax impact is likely zero anyway.
@MJR-TX
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