You will report the interest you earned on Fed Sch B. Follow these steps:
- go to federal income,
- interest,
- skip import,
- received from -enter description like son's mortgage
- enter amount of interest
- continue, none,
- continue
Rhode Island does tax non-source income but interest is only taxed when associated with a business or trade. Yours would not be taxable according to RI DOR.

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