Divorce and Taxes in Minnesota: 7 Costly Mistakes (and How to Avoid Them)

Death and taxes may be inevitable, but tax surprises in a divorce usually are not. Most of the expensive ones come from a short list of mistakes that are easy to fix if someone spots them before the judgment and decree is signed, and very hard to fix after.

Here are the seven that cost Minnesotans the most money, in plain English.

A quick note before we start: I am a Minnesota divorce lawyer, not a CPA. This is general information, not tax advice. If real money is at stake, bring a tax professional in before you sign anything.

Mistake 1: Picking the wrong filing status (the December 31 rule)

The IRS looks at one day: December 31. If your divorce is not final by December 31, you are treated as married for that entire tax year, even if you moved out in March. IRS Publication 504 lays out the rules.

That leaves you with these choices for the year you separate:

• Married filing jointly. Often the lowest combined tax, but read the warning below.
• Married filing separately. Usually more tax and fewer credits, but it keeps your return separate from your spouse’s.
• Head of household. Possible even while still married if you lived apart for the last six months of the year, paid more than half the cost of keeping up your home, and your child lived with you more than half the year.
• Single. Once the divorce is final, if head of household does not apply.

The joint return warning. When you sign a joint return, both of you are responsible for the whole tax bill, plus interest and penalties, even after the divorce. If you have any doubt about how your spouse reports income, filing separately can be the safer choice.

Pro tip: at mediation, the question of how you will file taxes often never comes up. That is usually a mistake. Decide it, put it in writing, and say who pays any balance due and who keeps any refund.

Mistake 2: Assuming alimony works the way it used to

This is where older articles and well-meaning friends lead people astray. The rule depends on when your divorce or separation agreement was signed:

• Signed before 2019: alimony is generally deductible by the payer and taxable to the person who receives it.
• Signed after December 31, 2018: the payer cannot deduct it, and the person who receives it does not report it as income.
• Signed before 2019 but modified later: the old rule still applies unless the modification expressly adopts the new rule.

Minnesota’s income tax follows the federal treatment, so a 2026 maintenance award is not taxable on your Minnesota return either.

That may not sound like a big deal, but it is a huge deal. If you receive $3,000 a month in spousal maintenance under a 2026 decree, those are after-tax dollars. To take home $3,000 from a paycheck, you would likely need to earn close to $4,000. The same is true in reverse: if you pay $3,000 a month, you are paying with money you already paid tax on.

Many “my friend deducts his alimony” conversations are just comparing divorces from different years. If your case involves an older, pre-2019 maintenance order, have a CPA confirm how it should be reported.

Mistake 3: Leaving “who claims the kids” vague

Child support itself is tax neutral. It is never deductible and never taxable. What does affect your taxes is everything around it: who claims the children, who gets the credits, and how your parenting time schedule plays out.

For federal taxes, the IRS treats the parent the child lived with for more nights during the year as the custodial parent. In Minnesota, the court can allocate the dependency exemption and order the parent who has the child more than half the year to sign the release to the other parent (Minn. Stat. 518A.38, subd. 7). The Minnesota Supreme Court confirmed that courts can do this based on the child’s best interests in Rogers v. Rogers, 622 N.W.2d 813 (Minn. 2001).

The release is IRS Form 8332. It can move the child tax credit to the other parent, but it does not move head of household status, the earned income tax credit, or the child and dependent care credit. Those stay with the parent the child lives with. I walk through the details in Taxes and Divorce in Minnesota: 8 Common Questions.

The credits are worth fighting over. The federal child tax credit is $2,200 per child for 2025 and is adjusted for inflation after that. Minnesota has its own refundable child tax credit of $1,750 per qualifying child, which phases out as income rises, plus a separate Minnesota dependent exemption.

What to put in your judgment and decree so you never have to call your lawyer about this again:

• Who claims which child, in which tax years. “Odd years to Mom, even years to Dad” beats “the parties will alternate.”
• Who signs Form 8332, and by what date each year.
• Any condition, such as child support being paid in full through December 31.

And if you are tempted to file first and claim the child anyway: the IRS flags duplicate claims, asks both parents for proof, and disallows one. It is a slow, expensive headache. Settle it in the decree.

Mistake 4: Taking the asset with a hidden tax bill

Transfers of property between spouses because of a divorce are generally not taxed when they happen (Internal Revenue Code section 1041). The catch is the tax basis. When you receive an asset, you also receive your spouse’s original basis, so the tax shows up later when you sell.

That means $50,000 in cash and $50,000 in stock are not the same $50,000. If the stock was bought years ago for $1,000, you will owe tax on the $49,000 gain when you sell it.

Other places people get burned:

• Rental property, where past depreciation is taxed again when you sell.
• Business interests with built-in gains.
• Farmland that was a gift. Gifted property carries the giver’s old basis, which can be very low if the land was bought decades ago. Inherited property is different: it usually gets a new basis at the date of death.

Before you agree to a division, ask for the basis of each asset and compare after-tax values, not just account balances. My Minnesota Property Division Guide covers how courts value and divide these assets.

Mistake 5: Selling, or keeping, the house without a tax plan

When you sell your main home, you can exclude up to $250,000 of gain if you file single, or up to $500,000 if you file jointly, as long as you meet the ownership and use tests (generally, you owned and lived in the home for two of the last five years).

Two divorce rules help here. If your spouse transfers the house to you, you get credit for the time your spouse owned it. And if you move out but the decree lets your ex live in the home, that time can still count as your use. That is why the decree language matters if you keep your name on a house you no longer live in.

Here is how much timing can matter. Say you own a $1 million home you bought for $100,000. Sell it after the divorce as a single filer and $650,000 of the $900,000 gain is taxable. Between federal capital gains tax, the 3.8% net investment income tax, and Minnesota income tax (Minnesota taxes capital gains like regular income, at rates up to 9.85%), the bill could top $150,000. Sell while you are still married and filing jointly, and up to $500,000 of that gain may be excluded.

If the house is the biggest asset in your case, read Mortgages and Divorce and run the after-tax numbers before deciding who keeps it.

Mistake 6: Cashing out a 401(k) the wrong way

Retirement accounts cause more accidental taxes and penalties than anything else in a divorce, partly because people treat a $100,000 401(k) like $100,000 in the bank. It is not. Most of it is pre-tax money.

401(k)s and pensions. These are divided with a court order called a QDRO. Here is the rule most people do not know: money paid directly from the plan to the ex-spouse under a QDRO is not hit with the 10% early withdrawal penalty, even if that spouse is under 59½. It is still taxed as income, and the plan will withhold 20% for taxes if it is paid out in cash.

The trap: if the receiving spouse rolls the money into an IRA first and then takes it out, the penalty exception is lost. If you need some cash from the division, take it from the plan under the QDRO and roll the rest.

IRAs. IRAs do not use a QDRO. They are split by a transfer incident to divorce, ideally trustee to trustee. Do not withdraw the money and hand it to your spouse. That is a taxable distribution to you, plus the 10% penalty if you are under 59½.

Mistake 7: Forgetting the follow-up after the decree

• Update your W-4 right away. Your filing status, household and credits are changing.
• If you are self-employed, or you receive alimony under a pre-2019 order, plan for quarterly estimated taxes.
• Update beneficiary designations on retirement accounts, life insurance and payable-on-death accounts.
• If you change your name, update it with Social Security before you file, so your return matches.

Are divorce legal fees tax deductible?

Not anymore. The 2017 tax law suspended the deduction for legal fees in personal matters like divorce, and the 2025 tax law kept that rule in place. Plan on paying your divorce fees with after-tax money.

Your divorce tax checklist (before the decree is final)

• Decide how you will file for the current year, and put it in writing.
• Spell out who claims each child, in which years, and when Form 8332 is signed.
• Get the tax basis for brokerage accounts, real estate and business interests before you divide them.
• Use the right tool for retirement accounts: a QDRO for 401(k)s and pensions, a transfer incident to divorce for IRAs.
• Run the numbers on selling the house before or after the divorce is final.
• Update withholding, estimated taxes and beneficiary designations right after.

Frequently asked questions

Is alimony taxable in Minnesota?

Not under a divorce or separation agreement signed after 2018. Spousal maintenance under an agreement signed after December 31, 2018 is not deductible for the payer and not taxable to the recipient, and Minnesota follows the federal rule. Older agreements generally keep the old rule, where alimony is deductible and taxable.

Is child support taxable?

No. Child support is never taxable to the parent who receives it and never deductible for the parent who pays it.

Who claims the child on taxes after a divorce in Minnesota?

The IRS starts with the parent the child lived with for more nights. A Minnesota court can allocate the dependency exemption to the other parent and order the custodial parent to sign IRS Form 8332, so the decree should say who claims each child and in which years.

Do I pay the 10% penalty when a 401(k) is split in a divorce?

Not if the money is paid from the plan directly to the ex-spouse under a QDRO. It is still taxed as income. The exception does not apply to IRAs or to money rolled into an IRA first.

Can we still file jointly if we are separated?

Yes, if you are still legally married on December 31. Just remember that a joint return makes both of you responsible for the entire tax bill for that year.

Tax rules change, and every case is different. Use this as a list of questions to bring to your lawyer and your CPA, not as a substitute for either.