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

Model real-life mortgage decisions, including offset saving, paused contributions, hold periods, reuse of funds, and how much interest is saved across each stage.

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.

Short-Term Rental Business Calculator

Model the running costs and audit the full performance of a short-term rental portfolio in one place.

This short-term rental business management and audit calculator is built for hosts, co-hosts, and property managers who want to scale properly and audit the whole portfolio properly. Instead of stopping at booking income, it helps you work through staffing, software, trust costs, review drag, client net, business net, future expansion, and whole-portfolio auditing so you can see which properties make the most money, which ones lose the most, which ones have the most upside, and where costs need to be cut.

Short-term rental portfolio audit Business running costs Growth and staffing planning
Business and Audit View, Not Just One Property
Built for people buying, growing, restructuring, or auditing a short-term rental business who need to understand both the full operating model and which properties are helping or hurting the portfolio.
Model the current bookProperties, revenue, fees
Plan future scalingWorkers, hours, expansion
Track true costsSoftware, trust, admin
Audit the portfolioWinners, losers, upside
What this short-term rental business management and audit calculator helps you work through

Use it to test what a short-term rental portfolio or management business costs to run now, what happens as more properties are added, and how each property is performing inside the wider portfolio. It helps you move from top-line income into the real structure underneath the business so you can spot the strongest properties, the weakest properties, the biggest upside, and the places where costs need attention.

Front sheet setup Model property count, nightly rate, occupancy, cleaning, management fees, and custom revenue or expense lines.
Labour planning See worker lines, hours, and whether growth points toward part-time or full-time hiring.
Business costs Account for software, trust costs, internal support, and other operating expenses that affect margin.
Portfolio audit view See which properties make the most, lose the most, have the most upside, or need costs pulled back.