In 2026, the federal and New Jersey state income tax returns are both due on April 15. Taxpayers can file either electronically or by mail, with electronic submissions typically processed faster. New Jersey residents should be aware that refunds, especially those claiming the Earned Income Tax Credit, may take longer—approximately four weeks for e-filed returns and up to 12 weeks for mailed paper returns. Refunds are issued via direct deposit or paper checks from the Property Tax Relief Fund. To avoid penalties, taxes owed must be paid by the April deadline, although extensions can be requested, which provide additional time to file but not to pay. The federal deadline aligns with New Jersey’s, and failure to file or pay on time can result in penalties such as failure-to-file and failure-to-pay fines, which accrue monthly and can reach up to 25% of unpaid taxes. Taxpayers can check refund status using the state’s online tool or by calling the provided helpline.