Common Roth IRA mistakes
Last updated August 2026
Short answer
A Roth IRA is simple to open and easy to hold wrongly, which is a bad combination for an account whose value comes from decades of compounding.
Leaving it in cash
Transferring money and investing it are two separate actions, and only the first is obvious.
Contributions land in a settlement fund and earn very little until a trade is placed.
Choosing the investment in the same session as the transfer, or switching on automatic investing, closes the gap permanently.
Contributing while ineligible
The 2026 phase-out runs $153,000 to $168,000 for single filers and $242,000 to $252,000 for married filing jointly.
Somebody who contributes in January and earns above it by December has an excess contribution, taxed at 6% for each year it stays.
Removing the excess plus its earnings before the filing deadline avoids the tax, and recharacterisation is an alternative worth asking about.
The pro-rata rule on a backdoor conversion
Conversions draw proportionally from every traditional, SEP and SIMPLE IRA you hold, not from the specific dollars just contributed.
A $100,000 rollover IRA alongside a $7,500 non-deductible contribution makes roughly 93% of the conversion taxable.
The fix is clearing pre-tax IRA balances into an employer plan before 31 December of the conversion year, which many plans accept.
Try it in Walnut
Walnut connects to your brokerage and reads your IRA balances across providers, which is the figure the pro-rata calculation depends on.
Using it as an emergency fund
Contributions can be withdrawn at any age without tax or penalty, which makes the Roth tempting as a backstop.
The room used cannot be replaced, so a withdrawal permanently reduces the tax-advantaged space available to you.
It is a legitimate last resort and a poor plan, which is a distinction worth making before rather than during a bad month.
Putting the wrong assets in it
The Roth is the account whose growth is never taxed, so it should hold what you expect to grow most.
Holding bonds there while equities sit in a taxable account wastes the shelter on the asset that needed it least.
The allocation stays the same across accounts; only the location of each piece changes.
The two five-year rules
One applies to the account, determining when earnings can be withdrawn tax-free alongside being 59.5.
A separate one applies to each conversion, determining when converted amounts can be withdrawn penalty-free under 59.5.
Assuming an established account clock covers a recent conversion is a misreading that costs the 10% additional tax.
An annual check that catches all of these
Confirm the contribution was made for the intended tax year and that it is invested rather than sitting in cash.
Check income against the phase-out once the year is nearly over, and correct any excess before the filing deadline.
Look at what the Roth actually holds, since it should contain the assets you expect to grow most rather than the ones that needed shelter least.
Sources
Eligibility, excess contributions, the pro-rata calculation and the five-year rules are covered in IRS Publication 590-A and Publication 590-B, with 2026 figures from Notice 2025-67. Walnut is informational and is not an investment adviser. This guide is educational and not personalized tax advice.
FAQ
What is the most common Roth IRA mistake?
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Contributing and then leaving the money in cash. The contribution lands in a settlement fund and stays there until you place a trade, and accounts sit uninvested for years because nobody realised the second step existed.
What happens if I contribute while ineligible?
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A 6% excise tax applies for each year the excess remains. Removing it and its earnings before the tax filing deadline avoids the penalty entirely, which is why catching it in the same year matters.
What is the pro-rata trap?
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A backdoor Roth conversion is taxed proportionally across all your traditional, SEP and SIMPLE IRA balances. Somebody with a large rollover IRA finds most of the conversion taxable, which turns a routine manoeuvre into an unexpected bill.
Do I lose the contribution room if I withdraw?
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Yes. Roth contributions can be withdrawn at any time without tax or penalty, and the room used cannot be replaced. Treating the account as an emergency fund permanently shrinks your tax-advantaged space.
What is the five-year rule people get wrong?
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There are two. One applies to the account for qualified withdrawals of earnings, and a separate one applies to each conversion. Assuming the account clock covers a recent conversion is a common and costly misreading.
Should I hold bonds in a Roth?
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Usually not. The Roth is the account whose growth is never taxed, so it is the natural home for the assets you expect to grow most. Putting the slowest-growing assets there wastes the most valuable shelter you have.
Is contributing in January a mistake?
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Not usually, and it does create risk if your income might exceed the phase-out. Contributing after the year ends, once income is known, avoids the excess entirely, at the cost of a few months out of the market.
What about naming a beneficiary?
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Leaving it blank is the quiet mistake. An IRA passes by beneficiary designation rather than by will, so an outdated or missing form can send the account somewhere your estate plan never intended.
What should I check each year?
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That the contribution was made for the year you intended and is actually invested, that your income stayed under the phase-out, and that the account holds the assets you expect to grow most. Those three checks catch every mistake on this page.