JSFiddle - React, Tailwind, and code Playground

HTML

<input type="checkbox" id="ckbxEmp" >czech Bachs
<input type="text" id="txtbxSSNOrITIN" maxlength="5">

JavaScript

$(document).on("change", '[id$=ckbxEmp]', function () {
    
    var ckd = this.checked;
    $('[id$=txtbxSSNOrITIN]')
        .attr("maxlength", ckd? 2 : 5)
        .css({
            background: ckd? '#ffff00' : "green",
            width: ckd? 24 : 144
        }).val(function(i, v){
            return ckd && v.length>2 ? v.slice(0,2) : v;
        });
    
});