You would need to amend your taxes all the way back to 2016. The IRS does not allow you to claim a refund for taxes further back than 3 years, but they do expect you to fix any underreporting of income as far back as you find the under-reporting.
To report the foreign rental income, you will select
- Income
- Rental Properties and Royalties
- When setting up the property, select foreign and add the foreign address.
"Sec. 6501(e)(1) provides that the period for assessment of taxes is extended to six years when there has been an omission from gross income on a return of an amount more than 25% of the gross income stated in the return. Sec. 6501(e)(2) provides a similar rule for omissions from the reportable value of a gross estate or total gifts of items includible on a filed estate or gift tax return, and Sec. 6501(e)(3) provides a similar rule for returns of certain excise taxes. In addition, Sec. 6501(e)(1)(ii) extends the period to six years for failure to report specified foreign financial assets whose total value exceeds $5,000." Journal of Accountancy
You may want to work with a local tax professional to fix your underreporting of income since 2016.
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