Alimony and Child Support Modification in South Carolina

Life changes after divorce. Job losses, promotions, relocations, remarriage, and children aging out of the system all alter the financial picture that existed when the court issued its original order. South Carolina Family Court allows modifications to both alimony and child support — but only under specific legal standards, and the process requires more than just asking.

Modifying Alimony in South Carolina

South Carolina recognizes several types of alimony (periodic, lump-sum, rehabilitative, reimbursement), and the rules for modification depend on which type was awarded.

Periodic alimony (ongoing monthly payments) can be modified if the requesting party demonstrates a substantial, unanticipated change in circumstances since the original order. This is a high bar. The change must be:

• Substantial: A minor income fluctuation does not qualify. Courts look for changes like involuntary job loss, serious illness or disability, or a significant increase in the paying spouse's income.
• Unanticipated: If the change was foreseeable at the time of the original order, the court will not treat it as grounds for modification. Planned retirement, for example, is generally foreseeable.
• Not self-created: Voluntarily quitting a job or taking a lower-paying position to reduce payments will not persuade the court.

Lump-sum alimony cannot be modified after the order is entered. It is a fixed amount, often paid in installments, and the court treats it as a final property-like award.

Rehabilitative alimony (time-limited support designed to help the recipient become self-supporting) can sometimes be extended if the recipient demonstrates good-faith efforts toward self-sufficiency but needs additional time due to unforeseen circumstances.

Cohabitation and remarriage: Under South Carolina law, periodic alimony terminates automatically upon the remarriage of the recipient. It may also be reduced or terminated if the recipient is cohabiting with a romantic partner in a relationship resembling marriage — but the paying spouse must prove the cohabitation to the court.

Modifying Child Support in South Carolina

Child support modifications are governed by the South Carolina Child Support Guidelines. Either parent can request a modification by demonstrating a change in circumstances that would result in at least a 15% change in the support obligation when recalculated under the current guidelines.

Common grounds for child support modification include:

• Income changes: Involuntary job loss, disability, or a significant increase in either parent's income
• Changes in custody or parenting time: If the child begins spending substantially more overnights with the non-custodial parent, the support calculation may shift
• Changes in the child's needs: New medical expenses, educational costs, or special needs that were not present at the time of the original order
• Aging out: When a child turns 18 (or graduates from high school, whichever is later), support for that child terminates and the total obligation should be recalculated for remaining children

How to File for Modification

1. File a Petition for Modification with the South Carolina Family Court in the county that issued the original order (or the county where either party currently resides, if different).

2. Serve the other party with the petition and a summons. South Carolina requires formal service of process — you cannot simply mail the petition to your ex.

3. Prepare financial declarations. The court will require updated financial information from both parties, including income verification, tax returns, and a completed Financial Declaration form.

4. Attend the hearing. The judge will evaluate whether the change in circumstances meets the legal threshold and, if so, recalculate the obligation.

The modification takes effect from the date the petition is filed, not the date the court issues its ruling — so filing promptly matters if your circumstances have already changed.

What You Cannot Modify

South Carolina's equitable distribution of marital property is final and non-modifiable. Once the court divides assets and debts in the divorce decree, that division cannot be revisited. This means you cannot go back and ask for a different split of the house, retirement accounts, or marital debt — even if circumstances change dramatically. Only alimony and child support are subject to post-decree modification.

What the Toolkit Covers

The South Carolina After-Divorce Checklist includes a section on when and how to pursue modifications, along with worksheets to organize the financial documentation the court requires.

See more South Carolina guides →