What Tax Mistakes Can Cost You the Most in an Illinois Divorce?

 Posted on April 18, 2026 in Finances and Divorce

Taxes are probably not what you think about first when your marriage ends, but the tax choices made during your divorce in 2026 can follow you for years. Property transfers, retirement accounts, and support payments all carry tax consequences. Getting them wrong can cost you far more than you expect. A St. Charles, IL divorce attorney who knows the financial side of divorce can protect you from these mistakes. At Weiler & Associates, P.C., we routinely handle tax considerations in divorce and will fight for the best possible outcome for you.

How Does Selling the Marital Home Affect Your Taxes in an Illinois Divorce?

The marital home is often the biggest asset divided in a divorce. Under the Illinois Marriage and Dissolution of Marriage Act, 750 ILCS 5/503, property gained during the marriage is usually considered marital property. However, the law also lists some exceptions, such as certain gifts, inheritances, and property excluded by agreement.

Federal tax law adds another layer. Under IRC Sections 121 and 1041, transferring the home between spouses as part of a divorce is usually not taxable at the time. But the spouse who keeps the home also takes on its original tax basis, which can lead to a larger taxable gain when the home is sold later.

Under federal law, a homeowner may exclude up to $250,000 in capital gains, or up to $500,000 on a joint return if IRS rules are met. If one spouse keeps the home and sells it later as a single filer, they may no longer qualify for the larger joint exclusion.

What Happens to a 401(k) or IRA When You Divide It in an Illinois Divorce?

Retirement accounts are generally considered marital property in Illinois, so they get divided like everything else. However, taking money out of a retirement account the wrong way leads to a large, unexpected tax bill.

To divide a 401(k) or pension in a divorce, you usually need a Qualified Domestic Relations Order, or QDRO. This order tells the plan how to pay a share to the other spouse. If the account is handled the wrong way, the distribution can become taxable.

The tax rules are also more specific than many people expect. Payments made to a former spouse under a QDRO are usually taxed to that person, not the original account holder. They also typically avoid the 10 percent early withdrawal penalty.

IRAs are different. They are not divided with a QDRO. Instead, they are usually transferred tax-free under a divorce agreement through what is called a transfer incident to divorce.

Can Spousal Maintenance Tax Rules Affect Your Illinois Divorce Settlement?

The Tax Cuts and Jobs Act changed the tax rules for spousal maintenance in the last decade. For divorces finalized on or after January 1, 2019, the paying spouse can no longer deduct maintenance payments. The receiving spouse no longer pays income tax on them either.

This change affects how maintenance is negotiated. The paying spouse now carries a higher after-tax cost, so they often push back harder on the amount. An attorney who understands this shift can help both sides reach a number that makes sense, given what each person will actually keep.

Which Parent Gets To Claim the Child Tax Credit After an Illinois Divorce?

Only one parent can claim a child as a dependent each year. The custodial parent, the one the child lives with most of the year, gets that right by default. However, parents can agree to give the noncustodial parent the right to claim the child in certain years by signing IRS Form 8332.

When the divorce agreement does not spell this out, both parents sometimes try to claim the same child. Only one parent can do that each year. If both parents try, one return may be rejected, or the IRS may later require proof and deny one of the claims. Putting this in writing during the divorce avoids a problem that is easy to prevent but hard to fix after the fact.

Talk to a St. Charles, IL Tax Consideration Divorce Attorney Today

Tax problems that come up in divorce are legal problems, and they are much easier to prevent than to fix later. At Weiler & Associates, P.C., we understand how tax issues connect to property division, retirement accounts, and support. Lead attorney Tim Weiler is a Certified Financial Litigator with specific experience litigating and settling complex financial matters in divorce. To speak with our Kane County divorce lawyers, call 630-331-9110 today.