Say you sell a rental and carry a $185,000 note at 7% with a five-year balloon. You add it through the loan wizard: principal, rate, term, and the balloon date. The engine generates the full amortization schedule to the cent while you're still typing.
Each month you record the buyer's payment and the waterfall applies it for you; when they send an extra $500 toward principal, the note quietly gets shorter without changing the payment. You share the borrower portal link once, and the buyer can check their balance, payoff quote, and history any time: no login, no app, no calls to you asking “what do I still owe?”
The following January, NoteHarbor already has the year's interest totaled, so the 1098 generates from real numbers and you can download it or email it to the buyer on request. And when year five arrives, the balloon is right there on the schedule. It's not a surprise you find out about from the buyer.