WTP Mortgage Calculator

Model mortgage repayments, offset strategies, extra repayment plans, and long-term loan cost in one place.

This calculator is built for people who want more than a basic repayment figure. You can model the core loan settings first, then layer in offset balances, staged extra repayment rules, contribution timing, interest-only periods, and offset reuse decisions later on. That means you can see not just what the loan costs now, but how different saving and repayment choices can change interest paid, total cost, and time saved over the life of the loan.

Repayments + Offset + Strategy
Built to show how the mortgage behaves now, what changes over time, and where savings can come from when you model different repayment and offset decisions.
Model the basicsLoan, rate, term, fees
Plan strategiesOffset and extra repayments
Structure timingWeekly, fortnightly, monthly
Track savingsInterest saved across each stage
What the mortgage calculator helps you work through

Instead of stopping at one repayment number, this tool helps you understand how the mortgage behaves across the full loan life. You can compare repayment frequencies, account for monthly fees and setup costs, model interest-only periods, build staged rules for extra repayments or offset contributions, and open the full schedule to see the ongoing expenditure timeline in more detail.

Core loan modelling Set the amount, rate, term, repayment type, fees, and starting offset balance.
Short-term save and hold scenarios Test what happens when you save hard for a period, stop contributing, then hold or reuse the money later.
Stage-by-stage interest savings See how much interest is saved during the saving phase, during the hold phase, and across the overall scenario.
Offset reuse decisions Model whether money stays in offset or gets pulled back out later, and see how that changes the result.
Mortgage Calculator

Open the WTP Mortgage Calculator

This is not just a calculator for showing a repayment amount. It is built to help people model real-life mortgage decisions, including saving into offset for a short-term goal, pausing contributions, holding funds there for a period, then using the money later and seeing exactly how much interest was saved through each part of that process.

Best For Mortgage planning and staged saving strategies
Includes Offset, extra repayments, IO periods
Unique View Shows savings during save, hold, and reuse stages
View the Calculator

WTP Property Portfolio Analyser

Build a portfolio properly with investment property only, short-term rental property only, or a combined mixed-property scenario.

The WTP Property Portfolio Analyser system is built for scenario planning across an entire portfolio, not just one property at a time. You can model up to 20 properties, forecast buying now versus buying later, build a strategy around your own scenario, and work through the bigger picture across buying, holding, selling, debt reduction, and retirement planning. The tools are intentionally very similar because they all do the same core job — the only difference is whether you want to model investment property only, short-term rental property only, or both together in one combined portfolio.

One System. Three Ways.
Choose the analyser based on the type of portfolio you want to build, while keeping the same portfolio-planning logic underneath.
Portfolio sizeUp to 20 properties
Compare timingBuy now vs buy later
Strategy buildingBuild around your scenario
WorkflowSave, upload, continue later
What the portfolio analysers help you do

These tools help you build a full portfolio plan instead of relying on isolated calculations. You can work through property value, debt, income, expenses, projected growth, potential sale outcomes, and longer-term decision-making in one place. That makes it easier to compare timing, test different buying paths, and structure a portfolio strategy around what actually suits your goals and numbers.

Plan up to 20 properties Model a real portfolio, not just one property in isolation.
Forecast buy now vs buy later See how timing decisions can shift the future outcome.
Strategise around your scenario Build pathways based on your own assumptions and direction.
Choose the right portfolio type Investment only, STR only, or a combined mixed portfolio.