You are required to file an income tax return if your income is above the threshold for filing, even if you are retired.
The threshold for filing income tax returns are updated every year. You may find the link below informative:
https://turbotax.intuit.com/tax-tips/irs-tax-return/does-everyone-need-to-file-an-income-tax-return/...
The IRS provides a tool for determining whether you need to file depending on your specific circumstances. You can check your situation using this tool at the end of each year.
Here is the link to the tool:
https://www.irs.gov/help/ita/do-i-need-to-file-a-tax-return
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