Agent stops before stopping distance

I have code that checked if i was within stopping distance. If not then set the new destination, else call an event to say i have reached it.
Like this:

Code (CSharp):

1. if(Vector3.Distance(transform.position, target.transform.position) >  agent.stoppingDistance)
2. {
3. agent.SetDestination(target.transform.position)
4. }
5. else DestinationRechedEvent.Invoke();

It worked well. Sometimes the agent would get a bit closer but that was expected and accounted for based on my understanding of the behavior. But i have now noticed it sometimes stops before the stopping distance. So the SetDestination code does not make it move but it has not reached it yet. Its only of by a few decimal places and i can account for it by rounding but I wonder if there is something im doing wrong that i can fix rather than inserting rounding code all over. (I use it in a few different forms a lot)