Backdoor Roth IRA: How It Works and Who It May Fit
A backdoor Roth IRA is a strategy some high income earners use to fund a Roth IRA when their income is too high to contribute directly. It is not a special account type. It is a two-step process: make a nondeductible contribution to a traditional IRA, then convert that money to a Roth IRA.
The strategy is widely used and generally permitted under current law, but the details matter. Existing IRA balances, timing, and tax reporting can all change the result. Below, we explain how a backdoor Roth works, where people run into trouble, and how it fits into broader wealth and tax planning.
Start Here: A Complimentary Wealth and Tax Review
Before attempting a backdoor Roth conversion, it helps to know whether it makes sense for you and how it interacts with your other accounts. Compound offers a complimentary, no-obligation wealth and tax review that may include:
Your retirement accounts: traditional, Roth, SEP, SIMPLE, and employer plans
Recent tax returns: income level, prior IRA contributions, and reporting history
Your investment portfolio: how Roth assets fit into an overall asset location strategy
Long-term goals: retirement income, legacy, and charitable plans
Request your wealth and tax review.
Why Does the Backdoor Roth IRA Exist?
Roth IRAs offer tax-free qualified withdrawals and are not subject to required minimum distributions for the original owner. Direct Roth IRA contributions, however, phase out above certain income levels, and income limits apply that change over time.
Traditional IRA contributions do not have the same income cap, although the deduction may be limited if you or your spouse participate in a workplace plan. And Roth conversions have no income limit. Combining those two rules is what creates the backdoor.
How a Backdoor Roth Works, Step by Step
Contribute to a traditional IRA. Make a nondeductible contribution, up to the annual limit. Annual limits apply and are adjusted periodically.
Convert to a Roth IRA. Move the balance from the traditional IRA to a Roth IRA. Many people convert soon after contributing to limit any growth that would be taxable on conversion.
Report it correctly. Nondeductible contributions and conversions are reported on IRS Form 8606. Missing this form is one of the most common errors and can lead to paying tax twice on the same dollars.
If you have no other pre-tax IRA money, the conversion is often largely tax-free, since you are converting dollars that were already taxed.
The Pro-Rata Rule: The Most Common Pitfall
The pro-rata rule is where many backdoor Roth plans go wrong. When you convert, the IRS looks at all of your traditional, SEP, and SIMPLE IRA balances together as of the end of the year. You cannot choose to convert only the after-tax dollars. Instead, each conversion is treated as a mix of pre-tax and after-tax money based on the ratio across all of those accounts.
For example, if most of your combined IRA balances are pre-tax from an old rollover, most of your conversion may be taxable, even though your new contribution was not deductible.
Ways people sometimes address this include:
Rolling pre-tax IRA money into an employer 401(k), if the plan accepts roll-ins, which can remove it from the pro-rata calculation
Converting the full pre-tax balance in a year when doing so fits the broader tax plan
Skipping the strategy when the tax cost outweighs the benefit
Each option has tradeoffs, which is why this is worth modeling before acting. For more on converting larger balances, see our guide on converting pre-tax savings to Roth.
Other Rules Worth Knowing
Five-year rules. Different five-year rules can apply to Roth earnings and to converted amounts for owners under a certain age. Withdrawing converted money too soon may trigger a penalty in some cases.
Spouses. Each spouse can generally complete a backdoor Roth using their own IRA, subject to the pro-rata rule on their own accounts.
Legislative risk. Congress has discussed limiting the strategy in the past. Rules can change, so it is worth confirming current law each year.
State taxes. Wisconsin residents should also confirm how state income tax applies to any taxable portion of a conversion.
Who May a Backdoor Roth Fit?
A backdoor Roth may be worth discussing if you:
Have income above the Roth IRA contribution limits
Have little or no pre-tax money in traditional, SEP, or SIMPLE IRAs
Want more tax-free assets for retirement or for heirs
Already contribute to your workplace retirement plan
It is common among physicians, attorneys, executives, and business owners. If your employer plan allows after-tax contributions, a mega backdoor Roth may also be worth reviewing as part of broader high net worth financial planning.
How the Backdoor Roth Fits a Wealth Plan
A backdoor Roth is a small annual move, but repeated over many years it can build a meaningful pool of tax-free assets. That matters for wealth management in several ways:
Tax diversification. Having pre-tax, taxable, and Roth accounts gives more flexibility over which accounts to draw from in retirement. See retirement planning in Wisconsin.
Asset location. Investments with higher expected growth are sometimes held in Roth accounts.
Legacy planning. Roth assets can be an efficient asset to pass on, though inherited account rules apply. Coordinate estate decisions with your estate attorney.
To see how annual contributions may grow over time, try the Compound calculator. Results are hypothetical and for illustration only.
Because this strategy touches investments, tax reporting, and retirement income, it fits naturally where wealth management and tax planning and preparation work together. For high earners, our guide on tax planning considerations for high-income physicians covers related strategies.
Serving Clients Throughout Wisconsin
Compound works with high income earners, business owners, and families throughout Wisconsin, including Milwaukee, Madison, Waukesha, Brookfield, Green Bay, Appleton, and Eau Claire, as well as surrounding areas.
Considering a backdoor Roth? Request a complimentary wealth and tax review.
Frequently Asked Questions
What is a backdoor Roth IRA?
A backdoor Roth IRA is a process in which you make a nondeductible contribution to a traditional IRA and then convert it to a Roth IRA. It can allow people whose income exceeds Roth contribution limits to fund a Roth.
Is a backdoor Roth legal?
The strategy is generally permitted under current law. Rules can change, so confirm current treatment with your tax professional before acting.
Do I pay tax on a backdoor Roth conversion?
You may owe tax on any pre-tax money converted and on any growth before conversion. The pro-rata rule can make part of the conversion taxable if you hold other pre-tax IRA balances.
What form do I file for a backdoor Roth?
Nondeductible contributions and conversions are generally reported on IRS Form 8606. Accurate reporting helps avoid paying tax twice.
Can I do a backdoor Roth every year?
Many people repeat the strategy annually, subject to annual contribution limits and their individual tax situation.
Compound is a registered investment adviser. Registration does not imply a certain level of skill or training. This article is for informational and educational purposes only and should not be construed as personalized investment, tax, or legal advice. Tax laws are complex and subject to change. Strategies discussed may not be suitable for everyone, and there is no guarantee that any strategy will achieve its objectives or reduce taxes. Calculator results are hypothetical, are not guarantees of future results, and do not reflect any actual investment. Investing involves risk, including possible loss of principal. Diversification does not ensure a profit or protect against loss. Please consult your tax, legal, and financial professionals before acting on any information in this article. For more information, see Compound's Form ADV, available at adviserinfo.sec.gov.
About Compound Wealth
Compound Wealth brings together professionals across tax planning, wealth management, accounting, and business transition services to provide a coordinated planning experience. This collaborative approach supports evaluating financial decisions from multiple perspectives while supporting each client's broader planning objectives.
