Having a fight with the ATO? Let me help.

Tax Audits, Objections & Appeals

Tax Related Crimes

Tax Lawyer Catriona Hartigan

Being on the wrong end of an ATO investigation or debt recovery action is stressful. It can be overwhelming when you are up against such a big organisation. It’s you, the small business owner, against the ATO and its 20,000 employees. It can seem impossible to fight back against the ATO’s huge resources.

This is where I can help you. I am a tax lawyer based in Adelaide. I specialise in tax disputes. I spend my days helping small businesses to deal with the ATO. I help with interest and penalty remissions, objections to tax decisions, tax audits and more.

No matter where you are in Australia, if you’re in a dispute with the ATO, then I can help.

If you have any questions about how I work, please read my frequently asked questions page, or call me on 0421 120 379 for a chat.

What my clients say about my work   

I’m an accountant at Precision Management Accounting. One of my clients had some difficulties lodging his BAS with the ATO and he received a penalty notice from the ATO for over $4,000!

I contacted Catriona to see if she could help us to have the penalty reversed. Catriona drafted a letter to the ATO and I soon realised that the negotiation process was in fact a legal process that was heavily reliant on using correct wording and terminology – something that was out of my accounting skill set. Catriona’s letter was accepted by the ATO and all penalties were reversed – making my client extremely happy!

As an accountant, it’s great knowing I have Catriona who can also help my clients with any ATO issues.Anita Wassermann | Precision Management Accounting


I had a Court summons for failing to lodge tax returns. It was a complex problem, one that I could no longer avoid. What I desperately needed was a specialist in taxation, a legal firm that did not treat me as another number.

I found Hartigan Law on the internet and the website told me exactly what I wanted to read. I met with Catriona and we had a lengthy discussion about my situation, how it arose and what she thought was the best way to handle it. Before the hearing there were a few more meetings with Catriona.

The day of the hearing came, and that was where I saw that I had definitely made the right choice in having Catriona represent me. She confidently and purposefully explained my situation to the magistrate, her defence was strong reasonable and truthful. I had never hoped for such a great result and as low a fine, and it showed that Catriona was there to represent me, to do her best and not just go through the motions.

If ever I had to contend with the ATO again Catriona is definitely the person I want in my corner. Matthew Beaumont | Small Business Owner