---

if (data.contractType == "КПП") {
    $("#maxPaymentTermDiv").show();
} else {
    $("#maxPaymentTermDiv").hide();
}



<div class="col-sm-4" id="maxPaymentTermDiv">
    <label for="maxPaymentTerm">Максимальный срок выплаты</label>
    <input
        type="text"
        class="form-control"
        id="maxPaymentTerm"
    />
</div>