The Debt Payoff Calculator loads your mortgages, investment loans, HECS, credit cards, and personal loans and shows you when each one will be paid off — and what happens when you put extra money toward repayments.
What it does
For every liability on your account, the calculator:
- Uses the loan terms you’ve already captured (interest rate, repayment amount, repayment frequency, loan type).
- Applies your chosen repayment strategy to distribute any extra monthly amount.
- Projects each loan’s balance forward year-by-year and shows you a stacked-balance chart narrowing to zero.
- Shows three KPIs at the top: debt-free in (under the scenario), total starting debt, and total interest paid.
Repayment strategies
| Strategy | How it works |
|---|---|
| Avalanche | Puts all extra repayment toward your highest-interest loan first. When that loan is paid off, the freed amount cascades into the next-highest-rate loan automatically. Mathematically minimises the total interest you pay. |
| Snowball | Puts extra toward your smallest balance first. When that loan is gone, the freed amount cascades into the next-smallest balance. Produces quick wins by closing accounts early. |
| Proportional | Splits your extra amount across all loans in proportion to their current balances. Neutral; useful when you can’t decide or want a balanced approach. |
| Manual | You decide exactly how much extra to put toward each loan individually. |
All strategies automatically roll over freed cashflow — when a loan pays off mid-horizon, its allocation cascades to the next-priority loan so your extra budget stays fully deployed.
Repayment cadence
You can switch all your loans from monthly to fortnightly or weekly. Because there are 26 fortnights (and 52 weeks) in a year versus 12 months, switching to fortnightly or weekly adds slightly more repayment capacity per year, reducing your debt faster.
Where the data comes from
The calculator loads your liabilities from the Net Wealth Tracker (/net-wealth). If you added a mortgage or loan using Quick Add, the rate, repayment amount, and term are pre-filled automatically. If a loan is missing its terms, the calculator shows an “Add loan terms ↗” link that opens the entity’s settings in a new tab.
Saving and revisiting scenarios
When you click Calculate, the result is saved under the scenario name you’ve set. You can save multiple scenarios (e.g. “Avalanche with $500 extra” and “Snowball with $200 extra”) and reopen them any time from the Saved scenarios panel.
What it does NOT model (yet)
- Lump-sum repayments (e.g. using a tax refund or bonus). Coming in a future update.
- Side-by-side scenario comparison. Currently you can only view one scenario at a time.
- HECS PAYG repayment bands (income-linked compulsory repayments). HECS is modelled as a straight-line paydown at 0% interest in v1.
- Tax, inflation, or fees — all projections are nominal and pre-tax.
Where it fits
The Debt Payoff Calculator lives under Tools → Modelling. You can also reach it from the “Debt-free date” button in the top-right of the Net Wealth Tracker page.
For the full picture — including how your assets grow alongside your liabilities — use the Net Wealth Forecaster.