Contributions from post tax money are not taxed when put into a superannuation fund. They are called non-concessional contributions.
You can only make up to $150,000 in non-concessional contributions a year, as long as you are under age 65 or else pass the work test rule. If you are under 65 you can make a $450,000 non-concessional contribution, however you will not be able to make another non-concessional contribution for 3 years. Amounts in excess of the contributions cap are taxed at 46.5% in the fund.
If you are under age 65 or pass the work test rule, you may elect to make some of your contribution deductible. This depends on whether you are substantiallty self-employed and need the tax deduction. Currently if you are under 50 the maximum deductible amount is $50,000, over 50 it is $100,000. If you elect to make this concessional contribution you will pay tax of 15% on this amount.
The concessional caps above are independent to the non-concessional caps. This is only general and not financial advice. recommend you talk with your advisor.
