<div class="tarif-block">
<div class="tb-header">
<h2 data-id-user="1">ИП</h2>
</div>
<div class="tb-body">
<label class="radio">
<input class="forma" name="forma" type="radio" value="Специальный режим">
</label>
</div>
</div>
var userID = $('input[name="forma"]:checked').parent().parent().parent().attr('data-id-user');