Definitions for "nondeductible contribution"
Funds contributed to a qualified retirement plan that are not deducted for tax...
A contribution (for example, to an IRA) that cannot be deducted from income tax in the year for which it's made.
A contribution made to a traditional IRA and designated by the IRA holder as nondeductible either by choice or because of restrictions on the ability to make a deductible contribution. An income tax deduction is not taken for this contribution. A nondeductible contribution must be reported on a Form 8606 filed with the IRS.