Why this calculator is worth using

• Buying or already own it: work from a purchase price and deposit, or from your property’s current value and what you still owe.
• Deposit two ways: set it as a percentage with quick-select chips, or as a specific dollar amount, and see both figures live at once.
• Real calendar dates, not just years: enter your actual loan start date, and a separate interest-only start date if you restructured onto interest-only partway through an existing loan. See the exact date your interest-only period ends and your loan expires.
• Payment shock, made visible and adjustable: see what your repayment jumps to once interest-only ends, and test different future interest rates since nobody knows what rates will be in a few years.
• Choose what happens next: decide whether you’ll move to Principal & Interest, or roll onto another interest-only period at a different rate, since not everyone switches straight to P&I.
• The increase is impossible to miss: it states outright how much extra you’ll pay each time, not just the new total.
• Built-in date checking: flags it clearly if your interest-only period would run past your loan’s expiry date.
• Email yourself the report: get a full summary sent to your own email, including both scenarios, so you can revisit your numbers anytime.