How Connecticut Calculates Child Support
Connecticut uses the Income Shares model but with two important differences from most other states. First, Connecticut calculates child support based on net income rather than gross income. Second, Connecticut works in weekly amounts rather than monthly amounts. The Connecticut Child Support and Arrearage Guidelines govern all child support proceedings in the state. Understanding these two distinctions is essential to interpreting your calculator results correctly.
Net income means income after mandatory deductions — after taxes, Social Security, and Medicare. Working in weekly amounts is a calculation preference that Connecticut's guidelines require. The calculator converts between weekly and monthly automatically, but it helps to understand the underlying framework when reviewing the line-by-line breakdown.
The Connecticut Child Support Formula
Connecticut's calculation follows four steps.
Step one is calculating each parent's net weekly income. This means starting with gross weekly income and subtracting federal income tax, Connecticut state income tax, Social Security, Medicare, and mandatory union or professional dues. Connecticut state income tax uses a progressive structure ranging from 2 percent to 6.99 percent depending on income and filing status. Step two is adding both parents' net weekly incomes to produce the combined net weekly income. Step three is looking up the Basic Combined Support Obligation in Connecticut's schedule using the combined net weekly income and number of children. Step four is dividing each parent's net weekly income by the combined total to determine their income share percentage, then applying that percentage to the total obligation.
A quick example using weekly figures: Parent A's net weekly income is $800. Parent B's net weekly income is $500. Combined net weekly income is $1,300. Parent A's income share is 61.5%. If Connecticut's schedule shows a Basic Combined Support Obligation of $290 per week for one child at $1,300 combined income, Parent A's obligation is approximately $178 per week — or about $771 per month.
What Counts as Income in Connecticut
Connecticut uses a broad income definition. Courts include wages, salaries, overtime, commissions, bonuses, tips, self-employment income, rental income, pension and retirement distributions, Social Security benefits, SSDI payments, unemployment compensation, workers' compensation, disability benefits, and income from any other regular source.
Courts in Connecticut can impute income to a parent who is voluntarily unemployed or underemployed. The imputed income reflects what the parent could reasonably earn based on their education, work history, and the local job market.
Connecticut excludes income received for caring for a child from another relationship. Courts also exclude non-recurring income such as a one-time inheritance or insurance settlement, unless the parent regularly draws on those funds.
Step-by-Step: How to Use This Calculator
Because Connecticut uses net weekly income, the setup step is different from gross-income states.
Step 1 — Calculate your net weekly income. Start with your gross weekly income (annual salary divided by 52). Subtract federal income tax withholding. Subtract Connecticut state income tax. Subtract Social Security (6.2 percent of gross up to $176,100 annually in 2026). Subtract Medicare (1.45 percent of all gross income). Subtract mandatory union dues if applicable. The result is your net weekly income.
Step 2 — Calculate the other parent's net weekly income. Apply the same calculation using their gross income and estimated tax withholding.
Step 3 — Enter the number of children covered by this order.
Step 4 — Enter parenting time. Count your overnight stays per year and divide by 365 for your percentage. Connecticut applies a credit when the paying parent has significant parenting time.
Step 5 — Add healthcare costs. Enter the weekly or monthly cost of the children's health insurance premium — whichever you track more easily. The calculator handles the conversion.
Step 6 — Add childcare costs. Enter weekly or monthly work-related childcare expenses.
Step 7 — Review the weekly and monthly amounts in the results. Connecticut orders are often expressed as a weekly amount, so both figures are useful.
Parenting Time Adjustments in Connecticut
Connecticut applies a parenting time credit when the paying parent has substantial parenting time. Courts look at the overall parenting schedule and may apply an adjustment when the paying parent's time significantly exceeds the standard visitation level.
Connecticut does not use a rigid percentage threshold the way some states do. Instead, courts evaluate the specific parenting arrangement and apply credits that reflect the direct costs each parent bears during their time with the children. At near-equal parenting time, both parents' obligations are considered simultaneously, and the net payment is calculated from the higher-earning parent to the lower-earning parent.
If your parenting schedule is close to 50/50, the parenting time adjustment in Connecticut can meaningfully reduce the calculated obligation. Enter your exact overnight count to get the most accurate result.
Add-On Expenses in Connecticut
Connecticut adds healthcare premiums and work-related childcare costs to the base support obligation. These are allocated proportionally based on each parent's share of the combined net weekly income.
Courts may also address extraordinary unreimbursed medical expenses and educational costs. Connecticut courts have discretion to include other necessary expenses when the circumstances of the case require it.
Reading Your Results
Your results will display each parent's net weekly income, the combined net weekly income, the Basic Combined Support Obligation, each parent's income share, the parenting time adjustment if applicable, add-on allocations, and the final weekly and monthly payment amounts.
Confirm that your net income calculation looks reasonable. A common mistake is entering gross income rather than net, which will produce a result significantly higher than what a Connecticut court would actually order. If your take-home pay is roughly $3,500 per month, your net weekly income is approximately $808 — not your gross monthly salary divided by 4.
After You Get Your Estimate
Connecticut courts follow the Child Support and Arrearage Guidelines in most cases. Deviation is allowed when applying the guidelines would be inequitable or inappropriate. Courts consider the needs of the child, the financial resources of both parents, and any other relevant circumstances.
Connecticut allows modification when there has been a substantial change in circumstances. A commonly referenced threshold is a 15 percent change in the calculated obligation, though courts have discretion. A significant income change, a change in parenting time, or a change in health insurance costs are all grounds that may support a modification.
A licensed Connecticut family law attorney can help you verify your net income calculation and prepare for court — many offer a free initial consultation.