Super vs Mortgage
— Which Wins?

Super vs Mortgage: The Definitive Australian Guide

This is one of the most common financial decisions Australians face — and the right answer is almost never the same for two people. It depends on your tax rate, how long until you retire, your mortgage interest rate, and what your super fund actually returns after fees.

The core comparison is straightforward: paying down your mortgage gives you a guaranteed after-tax return equal to your interest rate. Putting extra money into super gives you a tax-advantaged return based on your fund's performance — but you can't access it until preservation age.

The tax advantage of concessional super contributions

When you make a salary-sacrifice or personal deductible contribution to super, it's taxed at 15% inside the fund — compared to your marginal rate of up to 47% outside. For someone on the 37% marginal rate, that's a 22% immediate tax saving on every dollar contributed. This is what makes super so powerful as a wealth-building vehicle for high income earners.

When paying off the mortgage wins

The mortgage generally wins when: your interest rate is high relative to your expected super return; you're close to retirement and want guaranteed debt reduction; you value liquidity and flexibility; or you're in a lower tax bracket where the concessional contribution benefit is smaller.