Rules for determining your modified adjusted gross income for purposes of IRA contributions.

IRA owners need to know their modified adjusted gross income for various purposes:

Finding your modified AGI is a two-step process. First find your adjusted gross income, then apply the modifications.

Adjusted Gross Income

Adjusted gross income ("AGI") represents your total income reduced by certain deductions known as "adjustments," but before you take your itemized deduction or standard deduction, and before you take the deduction for personal exemptions.
    If you file regular Form 1040 or Form 1040A, adjusted gross income is the last number at the bottom of page 1 (and the first number at the top of page 2). On Form 1040EZ, adjusted gross income appears on line 4 (as of 2005).

Q: Are capital gains included in AGI?

A: Yes. For example, if you have a $20,000 capital gain, it will increase your AGI (and your modified AGI) by $20,000. This is true even for long-term capital gains that are subject to special tax rates.

Estimating AGI

To estimate your adjusted gross income for a year that's not yet completed, it's usually best to begin with your adjusted gross income from the preceding year's tax return and estimate any changes from there.

Q: What if I contribute to, or make a rollover to, a Roth IRA, and later find out that my modified AGI is too large?

A: You should be able to avoid penalties if you take appropriate corrective action. For details, see Excess Contributions.

Modifications

To arrive at your modified AGI, start with your adjusted gross income and then add back the following items:

Note that you are not required to add back any contribution you made to an employer plan such as a 401k plan. If you are running up against the limit for modified AGI, one way to reduce that number is to make deductible contributions to an employer plan.

Exclude Conversion Income

There's an additional modification that's made only when you're determining modified AGI for purposes of the Roth IRA. In this case you exclude any income you report as a result of converting a traditional IRA to a Roth IRA. Without his favorable rule, the income reported on the conversion could prevent you from making additional Roth IRA contributions — or even disqualify the very same conversion that is causing you to report the income!

Example: You're single and have a traditional IRA worth $120,000 with no basis. Before you decide to make a conversion your AGI and your modified AGI are both equal to $80,000. If you convert this IRA to a Roth IRA your AGI will increase to $200,000. But the conversion doesn't count as part of your modified AGI, so you can still make contributions to your Roth IRA.

Required Distributions

Finally, there's a special rule dealing with required minimum distributions from traditional IRAs. You can convert a traditional IRA to a Roth IRA even if you're over age 70½ and receiving minimum distributions. But in the year of the conversion, you're still required to take the minimum distribution from the traditional IRA, and you're not allowed to transfer the minimum distribution to the Roth IRA. In other words, that portion of the money in your traditional IRA isn't eligible for rollover or conversion.
    Beginning in 2005, though, you don't have to count that minimum distribution as part of your modified AGI. This rule change is explained in Expanded Conversion Eligibility.

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