Get Many-to-Many checkbox value in Django

In django I have a form and one of the fields is a Many-to-Many field. For this Many-to-Many field I am displaying each item as a Checkbox instead of a multiple selector. As I iterate over the M-2-M field I need to know what the value for each item is.

{% for employee in form.employees %}
{{ employee.id}}
{% endfor %}

In this example form.employees is just a queryset of all the employees and as I iterate over them I need to know what their id is.