For context, for about 6 months I was working as a freelancer for a company (full time hours but I would just be 'employed' under my own ABN and I would issue them invoices for the hours I worked)
Since I didn't have tax being withheld this way, when I would be paid, to avoid a lump sum of tax needing to be paid at the end of the financial year, I would immediately pay a set amount into my income tax every week. I based this set amount based on what I would earn annually from working at the rate I was on, but I only ended up working as a freelancer for half a year before getting a new, permanent job. So when I run the numbers I've paid significantly more income tax than I needed to (I've paid almost $4000 when the amount I actually ended up earning would have only been taxed about $600).
Even though this tax was paid through voluntary means, am I still going to be able to have it paid back (minus what I do actually owe) when I do my tax returns this year, or should I request a refund of the excess?