From the 2019-20 income year new ring-fencing rules apply to residential property deductions. Ring-fencing means residential property deductions can only be used to offset income from residential property. You cannot use rental losses to offset other income like salary and wages.
Under the rules, you can only claim deductions up to the amount of income you earn from the property for the year.
You must carry forward deductions over that amount. You can use these deductions to offset your rental income in future income years.