Most Minnesota parents encounter child support as a number. It arrives in an order, or in a proposed order, or in a spreadsheet a lawyer emails over, and it is either livable or it is not.
Very few ever watch the calculation run. That is a shame, because the calculation is public, mechanical, and printed in the statute — and once you can see it, you can see something more useful: almost every input is fixed by arithmetic, and only two of them are genuinely contestable.
Those two are how many nights the child spends with each parent, and what a parent is treated as capable of earning. Nearly every Minnesota child support fight worth having is a fight about one of them.
This article describes Minnesota’s statutes in general terms. It is not advice about any particular family’s situation, and support calculations depend on facts a general article cannot supply.
The six steps, exactly as the statute writes them
Minnesota uses an income shares model: the statute estimates what the parents together would spend on the children, then divides that between them.
Minn. Stat. § 518A.34(b) sets out the procedure to determine a parent’s basic support obligation:
“(1) determine the gross income of each parent under section 518A.29; (2) calculate the parental income for determining child support (PICS) of each parent, by subtracting from the gross income the credit, if any, for each parent’s nonjoint children under section 518A.33; (3) determine the percentage contribution of each parent to the combined PICS by dividing the combined PICS into each parent’s PICS; (4) determine the combined basic support obligation by application of the guidelines in section 518A.35; (5) determine each parent’s share of the combined basic support obligation by multiplying the percentage figure from clause (3) by the combined basic support obligation in clause (4); and (6) apply the parenting expense adjustment formula provided in section 518A.36 to determine the obligor’s basic support obligation.”
“PICS” is the term to learn. It is gross income less the credit for nonjoint children — the children of a different relationship — and it is what every later step operates on.
Basic support is not the whole obligation. Under § 518A.34(f), the court determines each parent’s total obligation “by adding together each parent’s basic support, child care support, and health care coverage obligations,” calculated under §§ 518A.40 and 518A.41. And the final order “shall separately designate the amount owed for basic support, child care support, and medical support” (§ 518A.34(h)).
One category sits outside the presumptive number entirely. Under § 518A.34(e), “[u]nreimbursed and uninsured medical expenses are not included in the presumptive amount of support owed by a parent” — they are handled separately under § 518A.41. Parents routinely assume the monthly support figure covers the orthodontist. It does not.
The guideline table is a table
Step (4) sends you to Minn. Stat. § 518A.35, subd. 2, which is literally a chart. Combined PICS runs down the left in $100 bands; the number of joint children runs across the top; the cell is the combined basic support obligation for that month.
Read the table against its own header, not against memory. The header runs One, Two, Three, Four, Five, Six — the number of children ascends left to right, and the income bands also ascend in $100 steps down the left-hand column. The ordering itself is unremarkable; the risk is transcription. Reading a dollar figure off the line above or below its actual range label produces a figure for the wrong income band, and the error is not visible in the result.
We are deliberately not reproducing an excerpt of the table here. A partial chart invites exactly those errors, and a wrong number in a support calculation is not a harmless one. Pull § 518A.35, subd. 2 and read the row you need against the header. The first band is wide — $0 to $1,399 — and from there the table steps in $100 bands up to $19,900–$19,999, closing with a final row for $20,000 and over.
Past the top of the table, the number stops climbing. Section 518A.35, subd. 3(a), caps it: for parents whose combined PICS exceeds the income limit in subdivision 2, the basic support obligation “must be the same dollar amount as provided for the parties with a combined parental income for determining child support equal to the income limit under subdivision 2.” A household at $30,000 a month and a household at $20,000 a month land on the same guideline figure.
That cap has a door in it. Under subd. 3(b), a court “may order a basic support obligation … in an amount that exceeds the income limit” on a finding that a child has a disability or other substantial, demonstrated need for the additional support, for the reasons set out in § 518A.43. High-income cases involving a child with significant needs are the ones where this matters, and it is an argument that has to be made and supported — the cap is the default.
And the table stops at six children. For a proceeding involving more than six, § 518A.35, subd. 4, provides that the court “may derive a support order without specifically following the guidelines,” but must still consider the principles behind them and “both parents’ needs, resources, and circumstances.”
Two structural features matter more than any single row.
The table is presumptive, not mandatory. Under § 518A.35, subd. 1(a), “[t]he guideline in this section is a rebuttable presumption and shall be used in any judicial or administrative proceeding to establish or modify a support obligation under this chapter.”
The table stops. Under § 518A.35, subd. 1(e), “[f]or combined parental incomes for determining child support exceeding $20,000 per month, the presumed basic child support obligations shall be as for parents with combined parental income for determining child support of $20,000 per month.” Subdivision 3 says the same thing and then supplies the exception: a court may order more “if it finds that a child has a disability or other substantial, demonstrated need for the additional support for those reasons set forth in section 518A.43 and that the additional support will directly benefit the child.”
Above $20,000 in combined monthly PICS, the guideline is flat. More income does not produce more presumptive basic support. It produces an argument under § 518A.43.
Input one: overnights, and why the formula cubes them
Step (6) is where the parenting schedule enters the number, and Minnesota’s method is unusual enough to be worth spelling out.
Section 518A.36, subd. 1(a) first defines the currency:
“For purposes of this section, the percentage of parenting time means the percentage of time a child is scheduled to spend with the parent during a calendar year according to a court order averaged over a two-year period.”
It is scheduled time under a court order, averaged over two years — not what actually happened last month. It “may be determined by calculating the number of overnights or overnight equivalents that a parent spends with a child pursuant to a court order,” and overnight equivalents exist for a parent who has “significant time periods on separate days where the child is in the parent’s physical custody and under the direct care of the parent but does not stay overnight.”
And every order has to say so: “Every child support order shall specify the percentage of parenting time granted to or presumed for each parent.”
The formula itself, at § 518A.36, subd. 2(b), does something people find surprising. Calling the parent with fewer overnights “parent A” and the parent with more “parent B,” the court must:
“(1) raise to the power of three the approximate number of annual overnights the child or children will likely spend with parent A; (2) raise to the power of three the approximate number of annual overnights the child or children will likely spend with parent B; (3) multiply the result of clause (1) times parent B’s share of the combined basic support obligation as determined in section 518A.34, paragraph (b), clause (5); (4) multiply the result of clause (2) times parent A’s share of the combined basic support obligation as determined in section 518A.34, paragraph (b), clause (5); (5) subtract the result of clause (4) from the result of clause (3); and (6) divide the result of clause (5) by the sum of clauses (1) and (2).”
Overnights are cubed. That single design choice is why parenting time is the most-litigated input in Minnesota support practice. A linear adjustment would make each additional overnight worth roughly the same amount; cubing does not. The effect of moving overnights is smallest at the extremes and largest as the schedule approaches even — which is exactly the range in which most parenting schedules are negotiated.
The formula also decides who pays. Under subd. 2(c), if the result is negative, parent A is the obligor and the number becomes its positive equivalent; if positive, parent B is the obligor. The parent with more overnights is not automatically the one who receives support.
Two more rules complete the picture:
- Equal time, equal income. Under § 518A.36, subd. 3, if parenting time is equal and the parents’ PICS are also equal, “no basic support shall be paid unless the court determines that the expenses for the child are not equally shared.”
- No order, no adjustment. Under subd. 1(b), if there is no court order awarding parenting time, the court determines support “without consideration of the parenting expense adjustment,” and applies the adjustment once a parenting time order issues.
On the parenting time side of the file, Minn. Stat. § 518.175, subd. 1(g) supplies a floor:
“In the absence of other evidence, there is a rebuttable presumption that a child must receive a minimum of at least 25 percent of the parenting time with each parent.”
And a schedule that cannot be counted is itself a problem the court must fix. Under § 518.175, subd. 5(a), if a parenting plan or order “cannot be used to determine the number of overnights or overnight equivalents the child has with each parent, the court shall modify” it so that it can.
Input two: income the court decides you could earn
The second contested input is Minn. Stat. § 518A.32, potential income. It applies when “a parent is voluntarily unemployed, underemployed, or employed on a less than full-time basis, or there is no direct evidence of any income,” and it begins from a presumption: “it is rebuttably presumed that a parent can be gainfully employed on a full-time basis,” with “full time” meaning 40 hours a week except in trades that customarily use a different week.
Subdivision 2 gives the court three methods, “as appropriate”:
“(1) the parent’s probable earnings level based on employment potential, recent work history, and occupational qualifications in light of prevailing job opportunities and earnings levels in the community; (2) if a parent is receiving unemployment compensation or workers’ compensation, that parent’s income may be calculated using the actual amount of the unemployment compensation or workers’ compensation benefit received; or (3) the amount of income a parent could earn working 30 hours per week at 100 percent of the current federal or state minimum wage, whichever is higher.”
The statute then does something people miss: it lists the situations that are not voluntary. Under subdivision 3, a parent is not considered voluntarily unemployed or underemployed on a showing that the situation is temporary and will ultimately lead to increased income; that it “represents a bona fide career change that outweighs the adverse effect of that parent’s diminished income on the child”; that the parent “is physically or mentally incapacitated or due to incarceration”; or that a government agency has found the parent eligible for general assistance or supplemental Social Security income.
Three more protections sit alongside it. Subdivision 4: no potential income may be imputed to a parent receiving a TANF cash grant or comparable MFIP benefits. Subdivision 5: where a parent stays home to care for a child covered by the support order, the court may weigh the parties’ pre-action child care arrangements, the parent’s employment history and local job availability, the relationship between employment-related expenses and achievable earnings, the child’s age and health, and the availability of child care providers. Subdivision 6: a self-employed parent is not voluntarily underemployed if net self-employment income is lower “because of economic conditions that are directly related to the source or sources of that parent’s income.”
This is the input with the widest range of defensible answers, which is precisely why it is argued about. Overnights are countable. “What could this person earn” is a judgment.
Floors: the self-support reserve
Minnesota does not run the formula off a cliff. Minn. Stat. § 518A.42, subd. 1(a) states “a rebuttable presumption that a child support order should not exceed the obligor’s ability to pay,” and subd. 1(b) tells the court how to measure it: subtract from the obligor’s PICS “a monthly self-support reserve equal to 120 percent of the federal poverty guidelines for one person.”
If the resulting income available for support falls between the minimum and the guideline amount, the court reduces the obligation in a set order — medical support first, then child care support, then basic support (subd. 1(c)).
If it falls at or below the minimum, or the obligor’s gross income is under 120 percent of the poverty guidelines for one person, subd. 2 supplies fixed minimums: $50 per month for one child, $60 for two, $70 for three, $80 for four, $90 for five, and $100 for six or more. A parent ordered to pay the minimum “is presumed unable to pay child care support and medical support.”
The minimum does not apply to an incarcerated obligor, to a recipient of general assistance, SSI, TANF, or MFIP benefits, or where the court finds the obligor “receives no income and completely lacks the ability to earn income” (subd. 3). And under subd. 3(d), where the parenting expense adjustment drives basic support below the minimum, the lesser amount governs.
Deviation: when the court may leave the guideline
Minn. Stat. § 518A.43 is the deviation section, and its stated purposes are worth quoting: deviation “is intended to encourage prompt and regular payments of child support and to prevent either parent or the joint children from living in poverty.”
The court must consider all earnings, income, circumstances, and resources of each parent; “the extraordinary financial needs and resources, physical and emotional condition, and educational needs of the child to be supported”; the standard of living the child would enjoy if the parents lived together, “but recognizing that the parents now have separate households”; residence in a foreign country with a substantially different cost of living for more than a year; which parent takes the tax dependency exemption and its financial benefit; the parents’ debts as limited by subdivision 2; whether court-ordered support exceeds the garnishment limits in § 571.922; and, in out-of-home placement cases, whether redirecting support to reimburse the county would compromise reunification.
Two specific deviation authorities are easy to miss:
- Income disparity with a mid-range schedule. Under subd. 1a, the court may decline to order a party with “between ten and 45 percent parenting time” to pay basic support “where such a significant disparity of income exists between the parties that an order directing payment of basic support would be detrimental to the parties’ joint child.”
- Increase in the custodial parent’s income. Under subd. 1b, on a modification motion the court may deviate “when the only change in circumstances is an increase to the custodial parent’s income and the basic support increases.”
Debt-based deviations are tightly bounded. Under subd. 2, the court may consider debts owed to private creditors only if support has not been assigned to the public authority, the debt was reasonably incurred for necessary support or necessary generation of income, and the requesting party produces “a sworn schedule of the debts, with supporting documentation.” Any further downward departure on that basis “must not exceed 18 months in duration,” after which support “must increase automatically.”
And one clean rule that resolves a recurring misunderstanding — subd. 5: “An award of joint legal custody is not a reason for deviation from the guidelines.”
Modification: the 20 percent / $75 presumption
Minn. Stat. § 518A.39, subd. 2(a) lists eight grounds on which support terms may be modified, “any of which makes the terms unreasonable and unfair,” including substantially increased or decreased gross income of either parent, substantially increased or decreased need, a change in the cost of living as measured by the federal Bureau of Labor Statistics, extraordinary medical expenses not covered by § 518A.41, a change in the availability or cost of health coverage, the addition or substantial change of work- or education-related child care expenses, and emancipation.
Then subd. 2(b) builds a presumption around a number:
“It is presumed that there has been a substantial change in circumstances under paragraph (a) and the terms of a current support order shall be rebuttably presumed to be unreasonable and unfair if: (1) the application of the child support guidelines in section 518A.35, to the current circumstances of the parties results in a calculated court order that is at least 20 percent and at least $75 per month higher or lower than the current support order…”
Both conditions, not either. At least 20 percent, and at least $75 per month. Other listed triggers include a 20 percent decrease in a parent’s gross income “through no fault or choice of the party,” an unenforceable medical support provision, unavailable ordered health coverage, and an order stated as a percentage rather than a dollar amount.
Two limits deserve emphasis, because both cost people money:
A new baby does not, by itself, reopen the order. Under subd. 2(c), “[a] child support order is not presumptively modifiable solely because an obligor or obligee becomes responsible for the support of an additional nonjoint child, which is born after an existing order.”
Modification generally is not retroactive to when things changed. Under subd. 2(f), a modification “may be made retroactive only with respect to any period during which the petitioning party has pending a motion for modification but only from the date of service of notice of the motion on the responding party” and the public authority. The clock starts when the motion is served, not when the job was lost. That single sentence is the most expensive thing in chapter 518A for a parent who waits.
Finally, on a modification motion the court “shall not consider the financial circumstances of each party’s spouse, if any” (subd. 2(e)(1)), and shall not count compensation for work beyond a 40-hour week if six specific conditions are met, including that the excess employment began after the existing order and is voluntary rather than a condition of employment (subd. 2(e)(2)).
Parenting time is enforced on its own track
Support and parenting time are separate obligations, and Minnesota says so directly. Under § 518.175, subd. 1(c), “[a] parent’s failure to pay support because of the parent’s inability to do so shall not be sufficient cause for denial of parenting time.”
Enforcement of parenting time runs through § 518.175, subd. 6. When a parent has been deprived of court-ordered parenting time, the court shall order compensatory parenting time, which must be at least of the same type and duration, taken within one year, and at a time acceptable to the deprived parent. Where a party “has repeatedly and intentionally denied or interfered with court-ordered parenting time,” the court must additionally order reimbursement of costs and reasonable attorney fees if the party has the means to pay, and may impose a sanction of up to $500 payable to the other party, modify custody under the procedures in § 518.18, or award other relief in the children’s best interests. Those protections yield where the court makes written findings that the denial “was necessary to protect a child’s physical or emotional health.”
The court administrator must provide a pro se motion form for parenting time disputes, with an affidavit section and a description of the parenting time expeditor process under § 518.1751 — and that form “may not include a request for a change of custody” (§ 518.175, subd. 1(f)).
What to do
- Get the worksheet, not just the number. Chapter 518A contemplates one — § 518A.78 directs a worksheet — and the six steps of § 518A.34(b) are reproducible. If you cannot see which figure went in at each step, you cannot tell whether the result is right.
- Count the overnights before you agree to a schedule. Because § 518A.36 cubes them, a schedule change that looks minor on a calendar may not be minor in the calculation. Run it both ways before signing.
- Make sure the order states the parenting time percentage. Section 518A.36, subd. 1(a) requires it, and § 518.175, subd. 5(a) requires the court to fix an order from which overnights cannot be determined. An uncountable schedule creates a modification fight later.
- Document income honestly and completely. Gross income under § 518A.29 and self-employment income under § 518A.30 are where PICS comes from, and PICS drives everything downstream.
- If you are underemployed for a reason, put the reason in the record. Section 518A.32, subd. 3 lists what defeats an imputation finding, and subds. 5 and 6 add the stay-at-home and self-employment situations. These are proved with evidence, not asserted.
- File promptly when circumstances change. Section 518A.39, subd. 2(f) limits retroactivity to the period after service of the motion. Waiting six months to file is a decision to absorb six months.
- Budget separately for unreimbursed medical. Section 518A.34(e) keeps it outside the presumptive figure.
- Do not trade parenting time for money, or money for parenting time. They are separately enforceable, and § 518.175, subd. 1(c) forbids conditioning one on the other.
- Ask about the public authority. County child support offices administer many Minnesota cases, and the expedited process under § 518A.46 has its own procedures.
The observation
Minnesota’s child support statute is a machine with a small number of moving parts. Gross income, nonjoint children, the guideline table, the share of combined PICS, the parenting expense adjustment, the self-support reserve. Feed it the same facts twice and it returns the same number twice.
That is a feature, and it deserves more respect than it gets. It means most of what parents fear about support — that the outcome depends on who has the better lawyer, or who the judge likes — is largely wrong about the calculation itself.
But the machine only produces a number after someone decides two things it cannot decide for itself: how the child’s year is divided, and what a parent is capable of earning. Chapter 518A has almost nothing to say about the first — it just cubes whatever the parenting order tells it — and it hands the second to a court’s judgment across three methods and six escape hatches.
Which is why the practical advice is nearly the opposite of the instinct. Parents arrive wanting to argue about the support number. The support number is downstream. The arguments that change it are about the calendar and about the paystub, and they are usually cheaper to have early, before an order is entered, than later, when someone has to prove a 20 percent change and can only reach back to the date the motion was served.
Madgett Law, LLC handles Minnesota family law matters including child support establishment and modification, parenting time disputes, and enforcement. If you have questions about an existing order or a proposed one, send us a message or call 612-470-6529.
Sources: Minn. Stat. § 518A.34 (computation of child support obligations; six-step procedure in paragraph (b); split custody; total obligation in paragraph (f); unreimbursed and uninsured medical expenses excluded from the presumptive amount in paragraph (e); separate designation in paragraph (h)); § 518A.35, subds. 1, 2, 3, 4 (guideline as rebuttable presumption; the basic support table; the $20,000 combined PICS income cap and the disability/demonstrated-need exception; more than six children); § 518A.36, subds. 1, 2, 3 (parenting expense adjustment; definition and measurement of percentage of parenting time; the overnight-cubing formula; equal parenting time and equal income); § 518A.32, subds. 1–6 (potential income; rebuttable presumption of full-time employment; three methods; circumstances not treated as voluntary; TANF/MFIP; caretaker factors; self-employment economic conditions); § 518A.39, subds. 1, 2 (modification; grounds; the 20 percent and $75 presumption; nonjoint child born after an existing order; retroactivity limited to the period after service of the motion; spouse’s finances and excess employment); § 518A.42, subds. 1, 2, 3 (ability to pay; self-support reserve of 120 percent of the federal poverty guidelines for one person; minimum basic support amounts; exceptions); § 518A.43, subds. 1, 1a, 1b, 2, 5 (deviation factors; income disparity with ten to 45 percent parenting time; increase in custodial parent’s income; private creditor debts and the 18-month limit; joint legal custody not a basis to deviate); §§ 518A.29, 518A.30, 518A.33, 518A.40, 518A.41, 518A.46, 518A.78 (gross income; self-employment income; nonjoint children deduction; child care support; medical support; expedited process; worksheet). Minn. Stat. § 518.175, subds. 1, 5, 6 (parenting time; 25 percent rebuttable presumption; nonpayment of support not cause for denial; pro se motion form; modification where overnights cannot be determined; remedies including compensatory parenting time, costs and attorney fees, and a sanction of up to $500); § 518.1751 (parenting time expeditor); § 518.18 (modification of custody procedures) (Minnesota Office of the Revisor of Statutes). This article is general legal information, not legal advice, and reading it does not create an attorney–client relationship. Child support outcomes depend on facts specific to each family. Statutes change; verify current text before relying on it. No outcome is promised or implied.