Basically, you must file Form 8606 for every year you contribute after-tax amounts (non-deductible contributions) to your traditional IRA. Conversions from traditional, SEP, or SIMPLE IRAs must also be reported on Form 8606. Additionally, you must file the form every year you receive a distribution from your Roth IRA or your traditional IRA if you ever previously contributed after-tax amounts.
[Edited 3/24/2022|4:00am PST]
