IRA Income Phase-Out

An IRA income phase-out is a statutory range of modified adjusted gross income over which an IRA tax benefit is reduced proportionally to zero. Two different benefits are phased out by two different sets of rules, and conflating them is the most common error attached to the term. Under Internal Revenue Code section 219(g), a taxpayer who is an active participant in a workplace retirement plan loses the deduction for a traditional IRA contribution across an income range, while the contribution itself remains permitted. Under section 408A(c)(3), a taxpayer loses the ability to contribute to a Roth IRA across a different income range. The generic mechanic of a phase-out, and how it differs from a cliff, belongs to the broader term; what follows is specific to IRAs.

The three traditional-IRA deduction ranges, for 2026. If a single filer or head of household is covered by a plan at work, the deduction phases out over $81,000 to $91,000. If a married couple files jointly and the contributing spouse is the one covered at work, the range is $129,000 to $149,000. If the contributing spouse is not covered but the other spouse is, a separate and much higher range applies, $242,000 to $252,000. A married person filing separately who is covered by a plan gets a range of $0 to $10,000, written into the statute as an applicable dollar amount of zero and not adjusted for inflation. And if neither spouse is covered by a workplace plan, there is no income ceiling at all; the contribution is deductible at any income.

The Roth contribution ranges, for 2026. Single filers and heads of household phase out over $153,000 to $168,000, married couples filing jointly over $242,000 to $252,000, and a married person filing separately over $0 to $10,000, again unindexed.

One overlap worth naming so nobody mistakes it for a duplicate. The traditional range for a contributor whose spouse is covered and the Roth range for a joint filer are numerically identical, and they are expected to stay identical. Both are built from the same $150,000 statutory base, indexed by the same cost-of-living formula and rounded the same way, so they move together. They are still two different tests answering two different questions, one about a deduction and one about eligibility to contribute at all. Treating a figure from one as an answer to the other happens to give the right number today and is reasoning that will fail the moment Congress amends either provision.

Being an "active participant" is a status test, not a contribution test. The statute reaches participants in qualified plans, 403(a) annuity plans, federal and state government plans, 403(b) arrangements, simplified employee pensions, and SIMPLE retirement accounts. It expressly excludes eligible 457(b) plans. Two details catch people. The determination is made "without regard to whether or not such individual's rights under a plan, trust, or contract are nonforfeitable," so being unvested does not help, and receiving an employer contribution you did not ask for is enough to make you an active participant. Narrow carve-outs exist for members of a reserve component serving 90 days or less on active duty, and for volunteer firefighters.

A real piece of relief for separated spouses. Section 219(g)(4) provides that a married couple who file separate returns and live apart at all times during the year are not treated as married for this purpose, so the punishing $0 to $10,000 band does not apply and the single-filer ranges are used instead. The same rule is imported into the Roth test.

Each test defines income differently, and one difference is genuinely useful. The traditional-IRA measure is adjusted gross income determined after applying the Social Security benefit inclusion and passive activity rules, and without regard to several exclusions including the foreign earned income exclusion, plus the IRA deduction itself added back. The Roth measure is the same, with one carve-out: income included as a result of a Roth conversion is not counted. So a large conversion does not push a saver out of Roth contribution eligibility, even though it raises adjusted gross income for almost every other purpose.

Do not reach for these numbers for the retirement savings contributions credit. That credit has its own ceilings, structured as hard cutoffs rather than proportional bands, and they are neither the traditional nor the Roth figures.

Work out the modified adjusted gross income the relevant test uses, find the applicable range, and measure how far into it you are. The reduction bears the same ratio to the dollar limit as your excess income bears to the width of the range. Two mechanical rules then apply. The reduction is rounded down to the next lowest $10, and the resulting limit is never reduced below $200 unless the arithmetic takes it all the way to zero.

A hypothetical example on the deduction side, using 2026 figures. Priya is single, age 40, covered by a 401(k) at work, with modified adjusted gross income of $85,000 and an IRA contribution limit of $7,500. Her range runs from $81,000 to $91,000, so it is $10,000 wide, and she is $4,000 into it. Forty percent of her limit is therefore lost: $7,500 multiplied by 0.40 is $3,000, leaving $4,500 deductible. She may still contribute the full $7,500; the remaining $3,000 becomes nondeductible basis reported on Form 8606.

A second hypothetical showing the $200 floor. If Priya's income had been $90,800, she would be $9,800 into a $10,000 band, and 98% of $7,500 is $7,350, which would leave only $150 deductible. The floor lifts it to $200. At $91,000 she is at the top of the band and the deduction is zero.

Pros

• A phase-out avoids the cliff effect, so one extra dollar of income never destroys an entire benefit.
• On the traditional side, only the deduction is at stake. The contribution itself is never blocked by income.
• The ranges are indexed, so they generally rise each year alongside earnings.
• Being ineligible for a direct Roth contribution does not close the Roth off, because conversion is not income-limited.

Cons

• There are more ranges than most people realize, and picking the wrong one produces a confidently wrong answer.
• Modified adjusted gross income is not a number that appears on the return, so it has to be built, and each test builds it slightly differently.
• The married-filing-separately band is $0 to $10,000 and is not indexed, so it tightens in real terms every year.
• The figures only settle at year end, so a December bonus or a capital gain can retroactively make a contribution made in January partly or wholly ineligible.