How Child Support Is Calculated in Connecticut

Connecticut child support is calculated under the Child Support and Arrearage Guidelines, adopted by the Commission for Child Support Guidelines pursuant to C.G.S. § 46b-215a. The Guidelines use an income-shares model: the premise is that a child should receive roughly the share of parental income they would have received if the household had stayed intact.

The worksheet moves in a fixed order. Each parent's gross weekly income is established, statutory deductions are subtracted to reach net weekly income, the two nets are combined, the combined figure is matched against the schedule for the number of children, and the resulting basic support obligation is apportioned between the parents in proportion to their share of the combined net.

The parent who does not have primary physical custody pays their share to the parent who does. That result is presumptive, meaning a court is required to order it unless a specific, stated reason to depart applies.

Gross income under the Guidelines is broad. It includes salary and wages, commissions, bonuses, overtime, tips, self-employment income net of ordinary business expenses, rental income, interest and dividends, pension and retirement income, Social Security benefits, unemployment and workers' compensation, and, in many cases, regular gifts and in-kind benefits that reduce living expenses.

The complication in Fairfield County cases is variable and equity compensation. A base salary is easy. A bonus that ranges from a quarter to twice base depending on the year, restricted stock units vesting on a rolling schedule, and deferred compensation payable years out are not. Courts commonly look to a multi-year average, sometimes with a supplemental percentage order on income above a stated threshold.

Self-employment is the other recurring dispute. Business expenses that are ordinary and necessary reduce income; personal expenses run through a business do not. That distinction is where most closely held-business support fights actually live.

The Guidelines enumerate the grounds on which a court may deviate from the presumptive amount. They include other financial resources available to a parent, extraordinary expenses for the child (medical, educational, or related to a disability), extraordinary parental expenses, the needs of a parent's other dependents, coordination of total family support, and shared physical custody arrangements that substantially alter each parent's costs.

Shared custody is the most frequently invoked. Where a parenting plan approaches an even split, the presumptive transfer payment can overstate the receiving parent's actual cost. A court may deviate, but it must say so on the record and state the basis.

Deviation is not discretionary hand-waving. It is a structured departure that has to be justified in writing. Cases are won and lost on whether counsel built the record for one.

Beyond the basic obligation, the Guidelines apportion three categories separately. The cost of the child's health insurance premium is allocated between the parents. Unreimbursed medical expenses are split by percentage, typically after the custodial parent absorbs the first $100 per child per year. Qualifying work-related child care is likewise apportioned.

These are often the practical difference between an order that functions and one that generates post-judgment motions. A support order that is silent on orthodontia, therapy, or summer care is an order that will be back in court.

Child support in Connecticut generally continues until the child turns eighteen, or, if the child is still a full-time secondary-school student living with a parent, until graduation or the child's nineteenth birthday, whichever comes first (C.G.S. § 46b-84(b)).

Educational support orders for post-secondary education are separate and governed by C.G.S. § 46b-56c. They are not automatic, the court must find that the parents would have provided support had the family remained intact, and the order is capped by reference to the cost of the University of Connecticut.

An existing support order can be modified on a showing of a substantial change in circumstances, or where the existing order deviates from the current guidelines figure by fifteen percent or more. Job loss, a significant raise, a change in the parenting schedule, and a child aging out all qualify as triggers worth reviewing.

Modification is prospective from the date of service of the motion. Waiting to file is expensive, the months before filing are generally not recoverable.