It will reduce your refund if it's a Roth IRA contribution that you are not eligible to make. Excess contributions are subject to a 6% excess-contribution penalty each year that they remain in the account. The penalty for an excess contribution will be calculated on Form 5329 Part IV and will appear on Form 1040 line 59.
You can avoid the excess-contribution penalty for 2017 by either obtaining a "return of contribution" (not a regular distribution) from the Roth IRA or, if you are eligible to make a traditional IRA contribution instead, by recharacterizing the contribution to a traditional IRA. Either transaction requires that you contact the Roth IRA custodian to perform the transaction by the due date of your tax return.
Before determining that you have an excess Roth IRA contribution, be sure to enter all items of income and all above-the-line deductions on your tax return. Your eligibility to make a Roth IRA contribution depends on your earnings and your modified AGI.
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