Lock In Letters

At times, the IRS may give an employer an order to withhold taxes at a minimum rate. Therefore, SPF-API provides a mechanism to prevent employees from changing certain state or federal withholding forms.

Sample Request

In the sample request below, use the lockInLetters element to provide a single state abbreviation or a comma-separated list of states. For a Federal lock-in letter, use the value "FEDERAL".

{
    "homeAddress": {
        "streetAddress1": "11 S Union St",
        "city": "Montgomery",
        "state": "AL",
        "zipCode": "36130"
    },
    "workAddresses": [
        {
            "streetAddress1": "64 N Union St",
            "city": "Montgomery",
            "state": "AL",
            "zipCode": "36130"
        }
    ],
    "lockInLetters": [ 
     "FEDERAL",
      "AL"
    ]
}