Dividing Retirement Accounts in Illinois Divorce

Retirement accounts are often the most valuable assets in an Illinois divorce after the marital home. Dividing them correctly requires understanding what portion is marital property, how to calculate that portion, what legal documents are needed to split the accounts, and how to avoid unnecessary taxes and penalties. Getting any of these steps wrong can cost tens of thousands of dollars.

Illinois is an equitable distribution state under 750 ILCS 5/503. This means the court divides marital property in a manner it deems fair, which is not necessarily 50/50. Retirement accounts — including 401(k) plans, pensions, IRAs, 403(b) plans, and military retirement — are subject to this framework. This article walks through how each type of account is handled, the role of Qualified Domestic Relations Orders (QDROs), and the tax issues you need to watch for.

Marital vs. Non-Marital Portions

Not all of a retirement account is necessarily marital property. Under 750 ILCS 5/503(a), marital property includes assets acquired during the marriage. If a spouse had a retirement account before the marriage, the pre-marital balance (plus its growth attributable to pre-marital contributions) is non-marital property. Only the portion earned or contributed during the marriage is subject to division.

This distinction matters most for long-tenured employees who had years of service before the marriage. If a spouse worked for the same employer for 30 years but was married for only 15, roughly half the retirement benefit may be non-marital.

The same rule applies to contributions made after the date of legal separation or filing for divorce. Those contributions are generally non-marital, though the precise cutoff date can be contested.

The Coverture Fraction

Illinois courts use the coverture fraction (also called the time rule or marital fraction) to determine the marital share of a pension or defined benefit plan. The formula is:

Coverture Fraction = Months of plan participation during the marriage / Total months of plan participation

For example, if a spouse participated in a pension plan for 240 months total and was married for 180 of those months, the coverture fraction is 180/240, or 75%. That means 75% of the pension benefit is marital property. The court then applies equitable distribution to that 75% — typically awarding the non-employee spouse some percentage of the marital share (often 50%, but not always).

For defined contribution plans like 401(k)s, the coverture fraction is less commonly needed because account statements show the balance at specific dates. The marital portion can be calculated by subtracting the pre-marital balance (adjusted for passive gains and losses) from the current balance.

Dividing 401(k) and 403(b) Plans

Employer-sponsored defined contribution plans — 401(k)s, 403(b)s, 457 plans, and thrift savings plans — are divided using a Qualified Domestic Relations Order (QDRO). A QDRO is a court order that directs the plan administrator to transfer a specified portion of the account to the non-employee spouse’s own retirement account.

The QDRO process in Illinois involves several steps:

1. The divorce judgment must specify the division. The marital settlement agreement or court order should state exactly how much of the retirement account the non-employee spouse will receive — either as a dollar amount or a percentage of the marital portion.
2. A QDRO is drafted. This is a separate legal document from the divorce decree. It must comply with both federal law (ERISA) and the specific plan’s requirements.
3. The plan administrator pre-approves the QDRO. Before submitting the QDRO to the court, it should be sent to the plan administrator for review. Each plan has its own model QDRO language and requirements. Submitting a QDRO that does not comply with the plan’s rules will result in rejection.
4. The court signs the QDRO. Once the plan administrator confirms the QDRO is acceptable, it is submitted to the Illinois court for entry.
5. The QDRO is sent to the plan administrator for processing. The plan administrator then segregates the non-employee spouse’s share into a separate account.

The non-employee spouse can roll their share into their own IRA or eligible retirement plan without triggering taxes or penalties. However, if they take a direct distribution instead of a rollover, the distribution is subject to income tax and, if the recipient is under 59 1/2, may also be subject to a 10% early withdrawal penalty — with one important exception: distributions from a 401(k) or 403(b) made pursuant to a QDRO incident to divorce are exempt from the 10% early withdrawal penalty (though income tax still applies).

Dividing Pensions

Pensions (defined benefit plans) present more complex valuation challenges than 401(k)s because their value depends on future variables — the employee’s final salary, years of service, and life expectancy. Illinois courts use two primary approaches:

Present value method. An actuary calculates the present value of the future pension benefit. The marital portion is determined using the coverture fraction, and the non-employee spouse receives their share through an offset — meaning they receive other marital assets (such as a larger share of the home equity or other accounts) equal to the present value of their pension share.

Deferred distribution method. The pension is not valued at the time of divorce. Instead, a QDRO is entered that entitles the non-employee spouse to receive a percentage of each pension payment when the employee spouse begins drawing benefits. This approach avoids the need for actuarial valuation and ensures the non-employee spouse shares in the actual benefit, including any cost-of-living adjustments.

Illinois courts may use either method, and the choice often depends on the parties’ preferences and the availability of other assets for an offset.

Dividing IRAs

Traditional IRAs and Roth IRAs are divided differently than employer plans. No QDRO is needed. Instead, IRAs are divided through a transfer incident to divorce under Internal Revenue Code Section 408(d)(6).

The divorce decree or settlement agreement must specify the division. Once the order is entered, the account holder’s financial institution transfers the specified portion to the receiving spouse’s own IRA. This transfer is tax-free as long as it is done pursuant to the divorce decree and transferred directly between IRA accounts.

A critical mistake to avoid: if the account holder withdraws funds and hands the money to the other spouse, the withdrawal is treated as a taxable distribution to the account holder, potentially triggering income tax plus the 10% early withdrawal penalty. The transfer must go directly from one IRA to another.

Military Retirement

If one spouse is an active-duty or retired member of the military, the Uniformed Services Former Spouses’ Protection Act (USFSPA) governs division of military retirement pay. Illinois courts can divide military retirement as marital property under 750 ILCS 5/503, subject to federal rules.

Key points for military retirement in Illinois:

• The 10/10 rule. The Defense Finance and Accounting Service (DFAS) will make direct payments to the former spouse only if the marriage overlapped with at least 10 years of creditable military service. If the overlap is less than 10 years, the employee spouse must make payments directly.
• The coverture fraction applies. The marital portion is based on the overlap between the marriage and military service.
• Survivor Benefit Plan (SBP). The SBP provides a continued annuity to the former spouse if the military member dies. Elections for former spouse SBP coverage must be made within one year of the divorce. Missing this deadline can permanently forfeit the benefit.

Valuation Date

The date used to value retirement accounts can significantly affect the outcome. Illinois law provides that marital property is generally valued as of the date of the trial or a date agreed upon by the parties. However, the date of separation, the date of filing, or the date of the QDRO submission can all be argued depending on market conditions.

If the stock market dropped significantly between the date of filing and the trial, the employee spouse would want the later valuation date. If the market increased, they would want the earlier date. Both sides should consider the valuation date carefully and address it in settlement negotiations.

Common Tax Traps

Several tax issues arise when dividing retirement accounts in divorce:

• Failing to do a direct rollover. If QDRO proceeds are paid to the non-employee spouse in cash rather than rolled into a retirement account, income tax applies. Always request a direct rollover.
• Overlooking the IRA transfer rules. As noted above, IRA transfers must go directly between accounts. A check made payable to the receiving spouse rather than to the receiving spouse’s IRA is a taxable event.
• Ignoring the tax character of the account. A $200,000 traditional 401(k) is not worth the same as $200,000 in a Roth IRA. The traditional account will be taxed upon withdrawal; the Roth will not. Equitable distribution should account for the after-tax value, not just the nominal balance.
• Forgetting about SBP elections. The Survivor Benefit Plan for military retirement requires timely action. A missed deadline cannot be undone.

For a broader overview of how retirement accounts are divided nationally, see our guide on dividing retirement accounts in divorce. For more on Illinois divorce law generally, see our article on parenting time schedules in Illinois.

What to Do Next

If retirement accounts are at stake in your Illinois divorce, take these steps:

1. Identify every retirement account. Gather statements for all 401(k)s, pensions, IRAs, 403(b)s, military retirement, and deferred compensation plans held by either spouse.
2. Determine the marital portion. Calculate pre-marital balances and apply the coverture fraction where applicable.
3. Address the QDRO early. Do not wait until after the divorce is finalized to start the QDRO process. Have the QDRO drafted and pre-approved by the plan administrator before the final hearing.
4. Consider tax consequences. Compare the after-tax value of retirement assets, not just the face value. A dollar in a pre-tax account is worth less than a dollar in a Roth account.
5. Consult an Illinois family law attorney. Retirement division involves the intersection of state divorce law, federal tax law, and ERISA. Schedule a consultation with an attorney experienced in dividing retirement accounts in Illinois to protect your financial future.

Frequently Asked Questions

What is a QDRO and do I need one in an Illinois divorce?

A Qualified Domestic Relations Order (QDRO) is a court order that directs the plan administrator of an employer-sponsored retirement plan (such as a 401(k), 403(b), or pension) to transfer a specified portion of the account to the non-employee spouse. In Illinois, a QDRO is required to divide most employer-sponsored retirement plans. Without it, the plan administrator has no authority to transfer funds. The QDRO is a separate document from the divorce decree and must be drafted, pre-approved by the plan administrator, and then signed by the court.

How does Illinois determine the marital portion of a retirement account?

Under 750 ILCS 5/503(a), only the portion of a retirement account earned or contributed during the marriage is marital property subject to division. For pensions, Illinois courts use the coverture fraction — the months of plan participation during the marriage divided by the total months of participation. For defined contribution plans like 401(k)s, the marital portion is typically calculated by subtracting the pre-marital balance (adjusted for passive gains and losses) from the current balance.

Are IRAs divided differently than 401(k) plans in Illinois?

Yes. IRAs do not require a QDRO. Instead, they are divided through a transfer incident to divorce under Internal Revenue Code Section 408(d)(6). The divorce decree specifies the division, and the financial institution transfers the specified portion directly from one IRA to another. This transfer is tax-free as long as it goes directly between accounts. If the account holder withdraws funds and hands the money over instead, the withdrawal is taxed as income and may trigger a 10% early withdrawal penalty.

What is the biggest tax mistake to avoid when dividing retirement accounts?

One of the most costly mistakes is failing to account for the tax character of different accounts. A $200,000 traditional 401(k) is not worth the same as $200,000 in a Roth IRA — the traditional account will be taxed upon withdrawal while the Roth will not. Equitable distribution in Illinois should consider the after-tax value of retirement assets, not just the nominal balance. Another common mistake is taking a cash distribution instead of a direct rollover, which triggers immediate income tax.

How This Guide Was Researched

This guide was created by reviewing publicly available legal information from official state statutes, judiciary websites, court resources, and family law publications. The goal is to explain family law topics in plain English so readers can better understand the process before speaking with an attorney.

Sources and Legal References

This guide is based on publicly available legal information and official sources, including:

• Illinois state statutes and family law codes
• Illinois judicial branch website and court resources
• Official Illinois court forms and filing instructions
• Illinois child support guideline publications
• State bar association and legal aid resources

Official Illinois Resources

• Illinois Courts – Self-Help
• Illinois Courts – Family Law Resources
• Illinois Divorce, Child Support & Maintenance Forms

For more about how we research our guides, see our editorial policy and sources methodology.

Related Guides

Learn more about related family law topics:

• No-fault divorce
• Mediation vs. litigation
• Custody laws by state
• Divorce with children
• Child custody laws explained
• Divorce checklist
• How custody is determined

Last updated: March 2026. This guide summarizes general legal information based on publicly available sources and is provided for educational purposes only. It does not constitute legal advice. For advice specific to your situation, consult a licensed attorney in your state.