The end of "what do I owe?"
Half of a treasurer's inbox is the same three questions: what do I owe, did my payment go through, and can you send me a receipt. The member portal answers all three permanently. Every member sees their live balance, every charge with its deadline, and the full history of what they've paid – updated in real time, including partial payments and anything the treasurer recorded by hand.
That transparency changes the dynamic. Members stop treating dues as a surprise and start treating them as a bill they can see coming – with the deadline, the early-bird discount, and the late fee all spelled out in advance.