Where does surplus capital exist?
Total wealth · each pathway modelled at 100% of your surplus · tap to expand
Enter your income and expenses. The planner uses current FY2026-27 tax rates to find your take-home pay and monthly surplus, then compares what that surplus achieves as extra mortgage repayments, ETF investments, or super contributions — showing the after-tax outcome of each so you can direct your next dollar deliberately.
It works out where your next dollar is best put to work. Starting from your income and expenses, it estimates your monthly surplus and compares what that surplus achieves across the main options — extra mortgage repayments, investing in ETFs, or salary-sacrificing into super — so you can see the trade-off rather than guess.
Surplus is your after-tax income minus your living expenses and existing commitments. The planner uses current FY2026-27 tax and Medicare rates to convert your gross income to take-home pay, then subtracts what you spend, leaving the amount actually available to allocate each month.
It depends on the after-tax return of each option and your time horizon. Paying down a 6% mortgage is a guaranteed 6% return; ETFs have higher expected returns but more risk; super is tax-advantaged but locked until preservation age. The planner shows each side by side so you can weigh certainty, access and tax against expected growth.
Australian FY2026-27 tax settings, a default long-run investment return you can change, and the concessional super cap. Every input is editable and nothing is stored on our servers — the figures are a planning estimate, not personal financial advice.
I'm a geologist-turned-builder who got frustrated with financial calculators that hand-wave how Australian tax actually works.
Every projection on MyNextDollar runs on current ATO mechanics for FY2026-27 — Stage-3 brackets, super contribution caps and HELP thresholds.
The calculation engine is covered by 88 unit tests and 10,000 fuzz scenarios, so what you see is exactly what the rules produce — not a rough estimate.