The Contribution Is Always Allowed; the Deduction Is Not
Two separate questions get merged into one and cause a great deal of confusion. Whether you may contribute to a traditional IRA is almost always yes, provided there is earned income behind it. Whether you may deduct that contribution is a different test entirely, turning on whether you or your spouse is covered by a plan at work. When the answer to the second is no, the contribution creates something that has to be tracked for as long as the account exists.
- The answer:: Contribution eligibility and deduction eligibility are separate. Earned income permits the contribution; workplace plan coverage and income decide the deduction.
- If nobody is covered:: There is no income limit at all. The contribution is fully deductible however much you earn.
- If you are covered:: The deduction phases out over a band of modified adjusted gross income, and above it disappears entirely — though the contribution itself remains permitted.
- Non-deductible means basis:: File Form 8606 for the year. That basis comes back tax-free later, but only pro-rata across all your traditional IRAs combined.
Where the AI summary above gets this wrong
"If you earn too much you cannot contribute to a traditional IRA."
That's surface-true. Here's what it misses:
- Income never blocks the contribution — There is no income ceiling on contributing to a traditional IRA. What income can remove is the deduction. Conflating the two stops people making contributions they are entitled to — and it is precisely those non-deductible contributions that make a backdoor Roth possible.
- Coverage matters more than income — If neither you nor your spouse is covered by a workplace plan, no income limit applies to the deduction at all. The phase-outs only exist for people who already have a plan at work, and the threshold for an uncovered spouse is much higher than for a covered one.
- The basis has to be tracked or it is lost — A non-deductible contribution is only worth making if Form 8606 is filed and the running basis is carried forward. Without that record the same dollars are taxed twice — once when earned, again on withdrawal — and nobody notices for twenty years.
01 Two questions that are not the same question
Eligibility to contribute to a traditional IRA rests on having taxable compensation, and for a married couple that test is met at household level. There is no income ceiling. Someone earning a great deal may contribute the full amount every year.
Deductibility is where income enters, and only through a specific door. If neither you nor your spouse is covered by a retirement plan at work, the contribution is deductible with no income limit whatsoever. The phase-outs apply only where workplace coverage exists.
Where it does, there are two different bands. One applies to the person who is covered. A much more generous one applies to a spouse who is not covered but is married to someone who is. A household can therefore be above the limit for one spouse and comfortably inside it for the other, on the same joint return.
Source: Publication 590-A, Contributions to Individual Retirement Arrangements
02 What a non-deductible contribution actually creates
When the deduction is unavailable, the contribution is still permitted, and it produces basis: money that has already been taxed sitting inside a traditional IRA. That basis should never be taxed again, and the only thing standing between you and paying tax on it twice is Form 8606.
The form is filed for the year of the contribution and carries a running total forward. It is easy to skip, because nothing bounces when you do — the consequence arrives decades later, when a withdrawal is treated as fully taxable because no record says otherwise.
For higher earners this same non-deductible contribution is the first step of a backdoor Roth. The mechanism only works because income limits the deduction rather than the contribution — the very distinction the common advice erases.
Source: Traditional and Roth IRAs
03 Getting the basis back, pro rata
Basis does not come back first, and it does not come back on demand. Every traditional IRA you own is treated as a single account for this purpose, and each withdrawal or conversion carries the same proportion of basis as the whole holding does.
If $30,000 of basis sits inside $250,000 of traditional IRA money, basis is 12% of the total, and 12% of any withdrawal comes out tax-free. You cannot elect to withdraw the basis alone, and opening a separate IRA to hold it changes nothing — the aggregation is the point of the rule.
Two consequences follow. A large pre-tax balance dilutes basis to near-irrelevance, which is why a backdoor Roth works cleanly only for someone with little or no traditional IRA money. And employer plan balances are excluded from the calculation, so rolling an IRA into a current 401(k) can restore a clean position.
Shows: how much of a withdrawal or conversion comes out tax-free because it represents your non-deductible basis, under the pro-rata rule that treats all traditional IRAs as one. Ignores: employer plan balances, which are not counted, and the year-end balance rule that fixes the ratio.
Source: Publication 590-B, Distributions from Individual Retirement Arrangements
Form 8606 is the least glamorous document in American retirement saving and the one I would most like people to file. It does nothing for you in the year you file it — no refund, no deduction, no visible benefit at all. It just records that this money has already been taxed. Skip it for fifteen years and there is no way to prove the point when it matters, and the IRS's default assumption is not in your favour. I made this mistake myself with a conversion once, and reconstructing the record was far more work than filing the form would ever have been.
FAQ
Can I contribute to a traditional IRA if I earn too much?
Yes. There is no income limit on contributing to a traditional IRA, only on deducting the contribution. If your income is above the deduction phase-out you may still contribute; the contribution becomes non-deductible basis instead.
When is a traditional IRA contribution fully deductible?
Always, if neither you nor your spouse is covered by a retirement plan at work — no income limit applies. Where workplace coverage exists, the deduction phases out over a band of modified adjusted gross income, with a much higher threshold for a spouse who is not covered.
What do I have to do after a non-deductible contribution?
File Form 8606 for that year and keep the running basis total. Without it, there is no record that the money was already taxed, and the same dollars are taxed a second time on withdrawal.
Sources
Regulator references
- Publication 590-A, Contributions to Individual Retirement Arrangements · Internal Revenue Service · 2025The deduction phase-outs, and how workplace plan coverage changes them.Last verified: 2026-09-07
- Traditional and Roth IRAs · Internal Revenue Service · 2025The contribution limits the deduction question sits on top of.Last verified: 2026-09-07
- Publication 590-B, Distributions from Individual Retirement Arrangements · Internal Revenue Service · 2025How non-deductible basis is recovered later under the pro-rata rule.Last verified: 2026-09-07
Calculator unit tests · the assertions this page's worked example is checked against, and their last result
Changelog
- 2026-09-07 — initial publish (new format)
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Jordan Reeves
Founder of Talk Through Wealth. A software engineer for over a decade before turning to retirement planning, Jordan built the projection engine after watching family members get fragmented, country-by-country advice that never reconciled. He writes about retirement the way the engine computes it: month-by-month, lifetime-long, and skeptical of any rule of thumb that hasn't been run through the math.