There is no SDI tax in New Jersey for 2023. If you worked in New Jersey, your employer should not have withheld any SDI, and there should not be any SDI in box 14 of your W-2. If your 2023 W-2 for New Jersey shows an amount (other than zero) for SDI, it's an error by the employer. The employer should correct the W-2 and refund the improperly withheld amount to you.