It would not show any difference. No numbers will change since it is not deductible. You can do it if you wish and have no changes but the comment that you contributed.
Even Form 8606 will not record the contribution.
Use Form 8606 to report:
- Nondeductible contributions you made to traditional IRAs.
- Distributions from traditional, SEP, or SIMPLE IRAs, if you have ever made nondeductible contributions to traditional IRAs.
- Conversions from traditional, SEP, or SIMPLE IRAs to Roth IRAs.
- Distributions from Roth IRAs.
