For Medicare levy purposes, your taxable income excludes the taxed element of a superannuation lump sum, other than a death benefit, that you received when you were aged between your preservation age and 59 years old that does not exceed your low-rate cap for 2017–18. For 2017–18, the low-rate cap is $200,000 but it could be less if you received superannuation lump sums in previous years.
For more information, see Low-rate cap amount for taxable components of superannuation lump sum payments.