Connecticut Joint Filing Agreement is a legal document that allows married couples in Connecticut to file their state income tax returns jointly, instead of separately. This agreement is only applicable for couples who are legally married, regardless of whether they were married in Connecticut or another state. By filing jointly, couples can combine their income, deductions, credits, and exemptions, which often leads to potential tax savings. This arrangement is especially beneficial when one spouse earns a significantly higher income than the other or when one spouse has extensive deductions or credits. It is important to note that both spouses must sign the joint filing agreement voluntarily and must include all necessary supporting documentation. The Connecticut Department of Revenue Services provides specific forms for couples seeking to file their income taxes jointly. The most common form is the "CT Joint Filing Agreement" (Form CT-1040JD), which couples must attach to their joint tax return (Form CT-1040). This agreement requires the couple to provide their personal information, such as names, social security numbers, and addresses, along with additional details related to their income, deductions, and exemptions. It is essential to carefully review the instructions provided by the Connecticut Department of Revenue Services to ensure accurate completion of the joint filing agreement form. Additionally, couples should consult with a tax professional or seek guidance from the department if they have any questions or concerns regarding their eligibility or the process. Overall, the Connecticut Joint Filing Agreement offers married couples the opportunity to streamline their tax filing processes and potentially receive tax benefits. It helps ensure proper coordination and avoids discrepancies between federal and state tax filings. By filing jointly, couples can take advantage of various tax incentives available in Connecticut, maximizing their overall tax savings.