Taking on Goldfishman's remarks i propose an additional solution on top of CommSex.

Look into getting a Novated Lease on a new car, something that you and your wife would need and love to have.
Government incentives are amazing on EV cars right now.

A Novated Lease will slightly reduce your overall net income, but also make you more tax efficient and you get a new car to boot!

Where does the punting come in? Well at the end of your lease you need to pay the residual to keep the car, normally 25%.
So its good practice to put a portion of your pay into a separate account to cover the the residual at the end of the lease.

The formula would be (Residual Cost / Lease Term X Frequency of Pay) + Punting.
Open a paperless fee free account with a bank thats not the Big4, I hear Macquarie Bank and ING are pretty good looking at the other thread and get your payroll to send that calculated amount there.
Additionally any costs related to the car can be claimed back from your leasing agency account. You can get these claims to be paid to the residual account for some more punting money.


While you're there, increase your superannuation contribution to the maximum or to whatever you can afford. Might as well since we are making sound financial decisions.

So in summary:
1. CommSex account for shares and punting
2. Novated lease for new car, setup another account for the residual end of lease payment
3. Increase pre tax super contributions

This should result in:
1. A decent share portfolio
2. A new car to distract your wife + any cash from trading in the old car
3. 2 accounts with cards to access discreet cash
4. Multiple reasons why your income has reduced into the joint account.
5. A better retirement fund.