Child Support Modification Check
A go/no-go check against your state’s real, documented modification threshold. 12 of 50 states + D.C. publish a fixed percentage or ratio; the rest use the substantial-change test.
Not legal or financial advice. Child support is determined by a court based on your state’s official worksheet. Online estimators provide an informal planning figure only. Laws change — always confirm the current guideline with your state child support agency or a licensed family law attorney in your state before relying on any number.
Quick answer
If a recalculated guideline amount differs from your current order by your state's threshold (commonly 10–20% or $50/month), you have a documented basis to request modification — plus a 3-year review right in most states. Thresholds below are from this site's state data, retrieved 2026-08-09. Sources: State guidelines · Modification guide.
Run the check
Compare your current order with what the guideline produces today. The checker applies the exact rule for the state you pick.
Modification Eligibility Checker
Uses Florida’s real, documented modification threshold (data retrieved 2026-08-09).
Likely qualifies
Current estimated support$1,179/mo
Proposed estimated support$901/mo
Change24% ($279/mo)
Your recomputed change is 24% ($279/mo), which meets Florida’s 15% or $50/mo threshold — you likely qualify to modify.
Florida rule: Florida presumes a substantial change when recomputed support differs by 15% or $50, whichever is greater (Fla. Stat. § 61.14).
Educational / planning aid only — not legal advice. This tool applies the threshold Florida publishes in our data; a court or agency makes the final decision and may consider factors beyond a single percentage. Consult a licensed family-law attorney in Florida.
All thresholds by state (retrieval-dated)
Each row is the threshold this site documents for that state, cited to the statute. Data retrieved 2026-08-09.
| State | Documented threshold | Statute / source |
|---|---|---|
| Alaska | Substantial change (no fixed % published) | Alaska Civ. R. 90.3 |
| Mississippi | Substantial change (no fixed % published) | Miss. Code Ann. § 43-19-101 |
| Nevada | Substantial change (no fixed % published) | Nev. Rev. Stat. § 125B.070 |
| North Dakota | Current order below 85% of new guideline | N.D. Admin. Code § 75-02-04.1 |
| Texas | Substantial change (no fixed % published) | Tex. Fam. Code Ann. § 154.125 |
| Wisconsin | Substantial change (no fixed % published) | Wis. Stat. § 767.511 |
| Delaware | Substantial change (no fixed % published) | Del. Code tit. 13 § 501 |
| Hawaii | Substantial change (no fixed % published) | Haw. Rev. Stat. § 576D-7 |
| Montana | Substantial change (no fixed % published) | Mont. Code Ann. § 40-4-204 |
| Alabama | 10% | Ala. Admin. Code r. 32-X-1-.03 (Rule 32) |
| Arizona | 20% | Ariz. Rev. Stat. § 25-320 |
| Arkansas | 20% or $100/mo | Ark. Code Ann. § 9-12-312 |
| California | Substantial change (no fixed % published) | Cal. Fam. Code § 4050 et seq. |
| Colorado | Substantial change (no fixed % published) | Colo. Rev. Stat. § 14-10-115 |
| Connecticut | Substantial change (no fixed % published) | Conn. Gen. Stat. § 46b-215 |
| Florida | 15% or $50/mo | Fla. Stat. § 61.14 |
| Georgia | Substantial change (no fixed % published) | O.C.G.A. § 19-6-15 |
| Idaho | Substantial change (no fixed % published) | Idaho Code § 32-706 |
| Illinois | Substantial change (no fixed % published) | 750 ILCS 5/505 |
| Indiana | 20% | Ind. Code § 31-16-8-1 |
| Iowa | Substantial change (no fixed % published) | Iowa Code § 598.21 |
| Kansas | Substantial change (no fixed % published) | Kan. Stat. Ann. § 60-1610 |
| Kentucky | Substantial change (no fixed % published) | Ky. Rev. Stat. § 403.212 |
| Louisiana | Substantial change (no fixed % published) | La. Rev. Stat. § 9:315 |
| Maine | Substantial change (no fixed % published) | 19-A M.R.S. § 2005 |
| Maryland | Substantial change (no fixed % published) | Md. Code Fam. Law § 12-204 |
| Massachusetts | Substantial change (no fixed % published) | Mass. Gen. Laws ch. 208 § 28 |
| Michigan | 10% or $50/mo | Mich. Comp. Laws § 552.16 |
| Minnesota | 20% | Minn. Stat. § 518A.34 |
| Missouri | Substantial change (no fixed % published) | Mo. Rev. Stat. § 452.340 |
| Nebraska | Substantial change (no fixed % published) | Neb. Rev. Stat. § 42-364 |
| New Hampshire | Substantial change (no fixed % published) | N.H. Rev. Stat. Ann. § 458-C:4 |
| New Jersey | Substantial change (no fixed % published) | N.J. Court Rule 5:6A (App. IX) |
| New Mexico | Substantial change (no fixed % published) | N.M. Stat. Ann. § 40-4-11.1 |
| New York | Substantial change (no fixed % published) | N.Y. Dom. Rel. Law § 240(1-b) |
| North Carolina | Substantial change (no fixed % published) | N.C. Gen. Stat. § 50-13.4 |
| Ohio | Substantial change (no fixed % published) | Ohio Rev. Code § 3119.021 |
| Oklahoma | 20% | Okla. Stat. tit. 43 § 118 |
| Oregon | Substantial change (no fixed % published) | Or. Rev. Stat. § 25.275 |
| Pennsylvania | Substantial change (no fixed % published) | 23 Pa.C.S. § 4322 |
| Rhode Island | Substantial change (no fixed % published) | R.I. Gen. Laws § 15-5-16.2 |
| South Carolina | 20% | S.C. Code Ann. § 20-7-891 |
| South Dakota | Substantial change (no fixed % published) | S.D. Codified Laws § 25-7-6.2 |
| Tennessee | Substantial change (no fixed % published) | Tenn. Comp. R. & Regs. 1240-02-04-.06 |
| Utah | 10% | Utah Code § 78B-12-301 |
| Vermont | 10% | Vt. Stat. Ann. tit. 15 § 654 |
| Virginia | Substantial change (no fixed % published) | Va. Code § 20-108.2 |
| Washington | Substantial change (no fixed % published) | Rev. Code Wash. § 26.19.020 |
| West Virginia | Substantial change (no fixed % published) | W. Va. Code § 48-13-101 |
| Wyoming | Substantial change (no fixed % published) | Wyo. Stat. Ann. § 20-2-311 |
| District of Columbia | Substantial change (no fixed % published) | D.C. Code § 16-916.01(a) Appendix I |
Frequently asked questions
What is a child support modification threshold?
Most states require the recalculated guideline amount to differ from your current order by a fixed percentage (commonly 10–20%) or a dollar amount (e.g., $50/month) before a court will treat the change as “substantial.” A few states have no bright-line number and apply a general substantial-change test.
I qualify on the number test — do I automatically get a new order?
No. Meeting the threshold creates a presumption (or opens the door) for modification; you still file a motion or agency review, prove the change is continuing (not temporary), and the court issues the new order. Modification is prospective — it rarely erases arrears from before filing.
What if my state has no fixed percentage?
States marked “substantial change” decide case by case. You can still file, but you will need to argue why the change is substantial and continuing — an income shift of 10–20% or more is usually persuasive.
Is there a free review without a lawyer?
Yes — federal law requires every state’s child support agency to offer a periodic review (usually every 3 years) that you can request without proving changed circumstances. Most states also allow a free administrative review before any court filing.
Advertisement · 728×90
Ad space — supporting free, ad-supported calculators.