With super, you can co-contribute to your spouse. He is already getting super, so I assume his is in retirement phase rather than accumulation phase, so the income isn’t taxed, nor is the super fund itself. Anything you add to his super won’t be taxed at all once it’s there including its income. For instance, you could use the bring forward rule to add three years of non concessional contributions at once, but you wouldn’t be able to add any for two years afterwards (ie you’re paying in three years worth in the first year), so you could add $100k to his and $100k to yours this year, $300k to each next year (the last year you have a lower income tax), for a total of $800k (if you both have that much room below the cap), $400k of which is tax free, and is readily accessible because he’s already drawing a pension and he’s above preservation age, and $400k of which isn’t readily available because it’s in your super, and you’re still in accumulation phase, and the super income is paying 15% tax. All this makes a few assumptions that you’d need to check out, but you should be able to reduce tax on income from the capital you have outside super.