Retirement plans come with strict IRS rules on how contributions, earnings, and withdrawals are attributed to account owners, spouses, and beneficiaries. Misunderstanding these rules can trigger unexpected taxes, penalties, or even plan disqualification. Below, I break down the key attribution rules for 401(k)s, IRAs, and other tax-advantaged accounts—and how to stay compliant.
Table of Contents
1. Attribution Rules for Spousal IRAs
The IRS applies income attribution to prevent abuse of retirement accounts between spouses.
Key Rules:
- Spousal IRA Contributions:
- If one spouse has no income, the working spouse can contribute to an IRA in their name.
- The attributed contribution limit (2024) is $7,000 ($8,000 if 50+).
- Both spouses’ IRAs cannot exceed the working spouse’s taxable income.
Example:
- John earns $80,000; Jane is unemployed.
- John can contribute $7,000 to his IRA + $7,000 to Jane’s IRA (total $14,000).
- If John only earned $10,000, the max combined contribution would be $10,000.
2. Attribution in Employer Retirement Plans (401(k), 403(b))
Ownership attribution affects controlled groups (businesses with overlapping owners).
Key Scenarios:
| Situation | Attribution Rule | Tax Risk |
|---|---|---|
| Spouse owns 50%+ of another business | IRS may treat both businesses as one for contribution limits | Excess contributions taxed at 6% annually |
| Parent & child co-own a business | If child under 21 works for parent, their 401(k) may be attributed to the parent | Risk of double contributions beyond IRS limits |
Example:
- Bob owns 100% of Company A, and his wife Sue owns 60% of Company B.
- The IRS may treat both companies as a single employer, meaning:
- The combined 401(k) employee deferral limit (2024: $23,000) applies across both plans.
- If Bob contributes $23,000 at Company A and Sue contributes another $23,000 at Company B, the IRS could impose a 6% penalty on the excess.
3. Inherited IRA Attribution & the “10-Year Rule”
Since the SECURE Act (2020), most non-spouse beneficiaries must withdraw all funds from an inherited IRA within 10 years (with some exceptions for minors and disabled beneficiaries).
Attribution Rules for Inherited IRAs:
- Spouse Beneficiary: Can treat the IRA as their own (no 10-year rule).
- Non-Spouse Beneficiary (e.g., child): Must empty the account by Year 10 (no annual RMDs unless the original owner was already taking them).
- Trust as Beneficiary: Complex rules; often subject to the 10-year rule unless structured as a “see-through” trust.
Example:
- Sarah inherits a $500,000 IRA from her father (who died in 2023).
- She must withdraw all funds by 2033, but can choose when (e.g., take nothing until Year 10, or spread withdrawals).
- If she fails, the IRS imposes a 25% penalty on the remaining balance.
4. Prohibited Transactions & Disqualified Persons
The IRS prohibits certain transactions between retirement accounts and “disqualified persons” (e.g., account owner, family members, business partners).
Attribution Triggers:
- Self-Dealing: Using IRA funds to buy property you or a family member will use.
- Leveraging Retirement Funds for Personal Loans (e.g., borrowing from your 401(k) to fund a relative’s business).
Penalties:
- Immediate taxation of the entire account (if in an IRA).
- 15% excise tax (if in a 401(k)).
Example:
- Mark uses his IRA to buy a vacation home his son rents.
- The IRS considers this self-dealing and may disqualify the IRA, making all funds taxable immediately.
5. Roth IRA Attribution & the 5-Year Rule
Roth IRAs have unique attribution rules for contributions vs. earnings:
| Withdrawal Type | Rule | Penalty if Broken |
|---|---|---|
| Contributions | Can be withdrawn anytime, tax-free | None |
| Earnings | Tax-free only if: 1) Account open 5+ years, AND 2) Owner is 59½+ or disabled | Earnings taxed + 10% penalty |
Example:
- Lisa, 40, opens a Roth IRA in 2024 and contributes $7,000.
- In 2026 (Year 2), she withdraws $8,000 ($7,000 contributions + $1,000 earnings).
- Result:
- $7,000 = tax-free (contributions).
- $1,000 = taxed as income + 10% penalty ($100).
Key Takeaways
- Spousal IRAs allow contributions for non-working spouses, but total contributions cannot exceed taxable income.
- Business owners must watch attribution in 401(k) plans to avoid excess contribution penalties.
- Inherited IRAs now mostly fall under the 10-year rule (exceptions for spouses).
- Prohibited transactions with disqualified persons can trigger full account taxation.
- Roth IRA earnings require 5+ years of seasoning before tax-free withdrawal.
Final Thought:
Retirement plan attribution rules are complex but critical for avoiding IRS penalties. When in doubt, consult a tax professional or ERISA attorney before making moves involving family members or multiple businesses.
