How Long Does Alimony Last in South Dakota?

There's no statutory formula for alimony duration in South Dakota. How long it lasts depends entirely on which type of alimony is awarded — and each type has different termination triggers and modification rules.

Duration by Alimony Type

General (Permanent) Alimony Duration

"Permanent" is misleading — it doesn't always mean forever. It means there's no predetermined end date. The obligation continues until one of these events occurs:

• Death of either party. The obligation dies with the payer (unless the decree specifically requires life insurance to secure payments) and terminates if the recipient dies.
• Remarriage of the recipient. Automatic termination in most cases, though some negotiated agreements explicitly waive this trigger.
• Cohabitation. If the recipient enters a marriage-like cohabiting relationship, the payer can petition to terminate. The payer must prove the relationship resembles marriage — shared expenses, shared residence, mutual dependence — not simply that the recipient has a new partner.

In practice, permanent alimony after long marriages (20+ years) where one spouse never established a career often lasts 10-15+ years until retirement, remarriage, or a material change.

Rehabilitative Alimony Duration

Rehabilitative alimony is tied to a specific goal: completing a degree, obtaining a certification, or finishing a training program. Duration matches the plan:

• Associate degree: 2 years
• Bachelor's degree: 4 years (or 2 if the recipient already has some credits)
• Professional certification: 6 months to 2 years
• Vocational training: 1-3 years

The court typically sets a hard end date based on the expected program completion. If the recipient completes the program early, the payer can petition to terminate early. If the program takes longer than expected (health interruption, program changes), the recipient can petition for extension.

Restitutional Alimony Duration

This type functions like a debt repayment. You supported your spouse through law school for 3 years — you might receive 3-5 years of payments calculated to reimburse your financial contribution. The timeline is fixed at the time of the decree and generally cannot be extended.

Critically: restitutional alimony typically does not terminate upon the recipient's remarriage, because it represents repayment of a past contribution rather than ongoing need-based support.

How to Modify Alimony in South Dakota

Under SDCL § 25-4-41, either party can petition the court to modify general or rehabilitative alimony by proving a material, involuntary change in circumstances. Both words matter:

Material: The change must be significant enough to fundamentally alter the financial picture. A $200/month raise won't qualify. Losing your job, becoming disabled, or the recipient doubling their income might.

Involuntary: Deliberately quitting your job to reduce income doesn't count. Taking early retirement when you could continue working may not qualify. The change must be beyond your control or a reasonable life decision made in good faith.

Common grounds for modification:

Payer seeking reduction:

• Job loss or permanent disability reducing income
• Retirement at normal retirement age
• Recipient's substantial increase in income
• Recipient's cohabitation with a new partner

Recipient seeking increase:

• Unexpected medical expenses or disability
• Payer's significant income increase (less likely to succeed alone)
• Cost-of-living changes making the original amount inadequate

What won't work:

• Voluntary unemployment or underemployment
• A brief, temporary income fluctuation
• Changes that were foreseeable at the time of the decree
• The payer's new spouse's income (their new spouse's money isn't relevant to the original obligation)

Making Alimony Non-Modifiable

Parties can agree in their settlement to make alimony terms non-modifiable. This means neither party can petition for changes regardless of what happens. Both sides give up flexibility:

• The payer gains certainty — they know exactly what they'll pay and for how long
• The recipient gains security — the amount and duration are locked in
• Both lose the ability to respond to genuinely changed circumstances

Non-modifiability must be explicitly stated in the written agreement. Absent explicit language, South Dakota courts retain jurisdiction to modify.

Alimony and Retirement

A common question: what happens to permanent alimony when the payer reaches retirement age?

Retirement at a normal age (62-67) with a genuine reduction in income typically qualifies as a material change in circumstances. The payer can petition for reduction or termination. However:

• Early retirement (before normal age) is scrutinized — was it voluntary to reduce alimony?
• The payer may still have income from retirement accounts, Social Security, and investments
• Courts look at the totality of financial circumstances, not just employment income

Plan for this in your original agreement. If you're the payer, negotiate an explicit termination date tied to a reasonable retirement age. If you're the recipient, understand that retirement will likely trigger a modification proceeding.

Protecting Your Interests

Whether you're paying or receiving alimony, the South Dakota Financial Split Guide includes worksheets for modeling different alimony scenarios — helping you evaluate trade-offs between lump-sum property settlements and ongoing payments before you commit to terms that may last a decade or more.

See more South Dakota guides →