If you are making nondeductible contributions or engaging in the backdoor Roth strategy, it is vitally important to fill out IRS Form 8606 each and every year, so you don’t end up paying taxes twice.
When you contribute to an IRA, you are in charge of tracking the type of contributions and keeping a history of all after-tax (nondeductible) contributions year after year. This is unlike your employer’s 401(k), where your company tracks everything for you.
Do I Need to Fill Out Form 8606?
Form 8606 must be filed with your Form 1040 federal income tax return if you (a) make nondeductible contributions to a traditional IRA or (b) converted assets (pre-tax or nondeductible) from an IRA to a Roth IRA. The purpose of reporting the nondeductible contributions to a traditional IRA is to effectively establish a “basis” in the IRA that would otherwise be fully taxable on a normal distribution or conversion to Roth. This reporting aids in avoiding taxation of an already taxed contribution. The purpose of reporting the Roth conversion is to establish the amount of the conversion that is taxable.
It’s worth repeating: If you don’t fill out Form 8606 correctly, you could end up being taxed twice for the same asset.
Deductible contributions to traditional IRAs and contributions to Roth IRAs are subject to income limitations based on filing status. Due to these limitations, many of our clients exercise the option of making a nondeductible contribution to a traditional IRA, which have no income limitations. Clients also convert traditional IRA assets to Roth IRAs to take advantage of the backdoor Roth strategy, an action that is also not subject to income limitations. These two steps together, referred to as the Backdoor Roth strategy, would both be reported on Form 8606.
Why Tax Form 8606?
Reporting the taxable contribution to an IRA or conversion to Roth on Form 8606 explains the transactions that occurred to the IRS. If you made a backdoor Roth contribution in the prior year, your custodian will provide you a Form 5498 to report the IRA contributions and a Form 1099-R to report Roth conversions. It is your responsibility — not your custodian’s — to determine if contributions are deductible, taxable or in excess of income limitations.
There is nothing to lead you to connect what is being reported by custodians to filing Form 8606. Also, for a number of years, leading tax software did not automatically produce Form 8606 as part of its normal preparation. For 2018, TurboTax and H&R Block software include ways to report backdoor Roth contributions. In both programs, careful attention needs to be given to answering the walk-through questions like those regarding “rollovers” and “conversions.” As in other instances, using a CPA to prepare your tax return can be of great benefit.
What Does a Correctly Filled Out 8606 Look Like?
What If You Fail to File Form 8606?
So what if you forgot to file tax form 8606? The total absence of filing can create an unnecessary tax liability. There is an opportunity to amend such an omission by later filing a Form 8606 (possibly with an amended tax return). The penalty for late filing a Form 8606 is $50. There is no time limit for the amended/late filing. However, if a filing omission resulted in an immediate tax consequence (like the full taxation of a Roth conversion), the amendment must be made prior to the three-year limitation on refunds.
Is This Filing Complication of Backdoor IRAs Worth It?
The potential to defer taxes on earnings in a traditional IRA or create nontaxable growth in a Roth IRA can be significant. Also, this strategy can be maximized by rolling over after-tax contributions from a 401(k).