Eligibility for the MLS LPSIA Tax Offset
A lump sum payment in arrears will only be eligible for the MLS LSPIA Tax Offset if the amount of the lump sum is equal to or greater than ten per cent (10%) of taxable income for MLS purposes (Excluding the spouse's income when there is a spouse) in the current year, less the total LSIA.
Click this link for information on the ATO website Lump sum payment in arrears.