By law you can object to tax assessments (except for the Diverted profits tax assessment) and most other decisions the ATO make, within the appropriate time limits.
You can object to most decisions about:
Time limits for lodging objections vary from 60 days to four years.
The time starts from the date the assessment or notice of decision was given to you.
This is generally taken to be the date the ATO's assessment, notice, ruling, demand, decision or other correspondence was delivered to you or your representative in the usual course of the post.
If the final lodgement day falls on a non-business day, your objection can be lodged on the next business day.
If you're outside the time limit, you can ask for an extension of time by including a written request with your objection.
The ATO will process a request for an extension of time, and notify you in writing of the outcome.
If the ATO accept your request, they will consider your objection.
If the ATO refuse, they will explain your right to review their decision.
➲ PS LA 2003/7 How to treat a request to lodge a late objection
Source: For detailed + current information regarding the time limit applicable to your objection please refer to ATO Website - Decisions you can object to and time limits
This FAQ is intended for general interest + information only.
It is not legal advice, nor should it be relied upon or used as such.
We recommend you always consult a lawyer for legal advice specifically tailored to your needs & circumstances.