Lower payment now, or equity now?
Compare an interest-only payment against a fully-amortizing one: the monthly difference, the equity you'd forgo, the payment jump when the IO period ends, and the lifetime-interest tradeoff. It compares structures — it doesn't recommend one.
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The tradeoff in plain terms
Interest-only lowers the monthly payment because you pay no principal for a set period — useful for cash flow, common in some investor and alternative-financing structures. The cost: no equity is built during that window, the full balance remains, and the payment rises when the loan recasts over the remaining term. Over the life of the loan you typically pay more interest. Whether that tradeoff is worth it depends on your plan for the property — which is your call, not this tool's.
Why does the payment jump later?
Because the full balance then amortizes over a shorter remaining term. Paying nothing toward principal early means the same balance is repaid over fewer years afterward.