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Kansas Alimony Calculator (2026)

Kansas law (K.S.A. §§ 23‑2902, 23‑2904) caps court‑ordered maintenance at 121 months, though spouses may agree to longer periods. Because the state has no statutory alimony formula, courts weigh the factors in the statutes. This calculator provides a widely used rule‑of‑thumb—30% of the higher earner’s gross income minus 20% of the lower earner’s gross income, with a 40% combined‑income cap and duration percentages—*as an estimate only*, not a legal determination.

Reviewed 2026-09-02 · Estimates only — not legal or financial advice.

Kansas has no statutory alimony formula. Courts decide case by case under K.S.A. §§ 23-2902, 23-2904. The calculator below shows a widely used rule of thumb (the AAML guideline) as a negotiation starting point — it is not the law and a judge may land anywhere the factors justify.
Before taxes.
Before taxes.
The law behind this calculator: Kansas maintenance (121-month statutory limit) — K.S.A. §§ 23-2902, 23-2904.

How Kansas calculates it

  • Calculate 30% of the higher‑earning spouse’s annual gross income.
  • Calculate 20% of the lower‑earning spouse’s annual gross income.
  • Subtract the lower‑earner amount from the higher‑earner amount to get a preliminary annual alimony figure.
  • Apply the 40% cap so the recipient’s total income does not exceed 40% of the combined income, adjusting the annual figure if necessary.
  • Convert the final annual amount to a monthly figure for a rule‑of‑thumb starting point.
  • Determine duration by applying 30% of marriage length if under 3 years, 50% if 3–10 years, 75% if 10–20 years, or indefinite if over 20 years.

Worked example

In the example, a higher‑earning spouse earning $100,000 per year and a lower‑earning spouse earning $40,000 per year, married 12 years, yields a rule‑of‑thumb alimony of $30,000 minus $8,000 = $22,000 per year, reduced to $16,000 by the 40% cap, which works out to about $1,333 per month, and a duration guide of 75% of 144 months, about 108 months. The court is not bound by any of this.

Frequently asked questions

What is the maximum length of court‑ordered alimony in Kansas?

K.S.A. §23‑2904 limits a court‑ordered maintenance order to 121 months, unless the parties mutually agree to a longer term.

Is alimony taxable in Kansas?

Kansas follows the federal treatment enacted after 2019: alimony payments are not deductible by the payer and are not taxable income to the recipient.

How does the length of my marriage affect the estimated alimony duration?

The rule‑of‑thumb uses 30% of the marriage length for marriages under 3 years, 50% for 3–10 years, 75% for 10–20 years, and treats marriages over 20 years as indefinite.

Can a Kansas court deviate from the 30%/20% rule‑of‑thumb?

Yes. Kansas has no statutory formula, so a judge may order any amount and duration based on the statutory factors, not the guideline.

Does Johnson County use a different alimony guideline?

Johnson County courts often reference an informal local guideline, but the rest of Kansas follows no formula and relies on the statutory factors.

Is the calculation different in Wichita, Overland Park or Kansas City?

No. K.S.A. §§ 23-2902, 23-2904 applies statewide, so courts in Wichita, Overland Park, Kansas City and every other county start from the same guideline. Local practice can differ in how judges weigh deviation factors and in typical negotiated outcomes, but the formula on this page is the one used across Kansas.

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