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About Us

Our Focus is on you!

At Hadlow and Trehy, we know that our clients want their accountant to be available when they're needed. That is why our focus is not on being the BIGGEST, but giving the best service.  Too often, larger accounting practices lose that personal touch with their clients, which is so important in a trusting business relationship.

So we undertake to put you and your business first. We guarantee to return your phonecalls and emails promptly (almost always the same day, or next business day if that's not possible!), so you're never left hanging. You will always get our undivided attention when you call, and prompt efficient service in all of our dealings with you.

About The Director   

Mike Trehy | B Fin Admin, CA, FTIA

Mike started his career in Armidale, country NSW in 1991, working as an accountant at one of Australia’s largest regional accounting practices.  Having graduated from the University of New England with a Bachelor of Financial Administration, he qualified as a Chartered Accountant in 1995. He is also a Fellow and Chartered Tax Advisor of the Taxation Institute of Australia and a Registered Tax Agent. He moved to Sydney in 2005, working at a suburban practice in Caringbah for 2 years before establishing Hadlow and Trehy in July 2008.

Mike's professional interest lies in the relationships he builds with his clients. He excels at conveying business and taxation advice in a simple and down to earth manner. His experience covers all aspects of running small to medium sized businesses including taxation and accounting advice, business plans, acquisitions and sales, cash flow budgetting and forecasting, and business development and growth strategies.

Mike's experience ranges from smaller rural industries to larger corporate retailers, wholesalers and manufacturers. He also has extensive experience with medical and health industry professionals.

Mike has now made his home in Gymea Bay in the Sutherland Shire. Sadly, he has been a passionate Cronulla Sharks supporter all his life.

Latest News


Hadlow and Trehy Chartered Accountants has a new Office number. You can contact us on:

(02) 9525 4441

All other contact details remain unchanged.

Feel free to contact us here.


With the current low interest rate environment, many people are thinking of starting (or adding to!) their property portfolios. At Hadlow and Trehy Chartered Accountants, we're well versed in all aspects of property investment, including cash flow impacts, use of Self Managed Superfunds, deductibility of costs and negative gearing tax effects.

If you've got questions in this regard, contact us to make an appointment to have all of your questions answered.

You can find all of the contact details and a map of our new location here.


At Hadlow and Trehy we advocate the use of online (cloud based) bookkeeping solutions, such as MYOB AccountRight Live, MYOB Essentials or Xero. Using this online technology allows us to communicate and collaborate with our clients in real time, and provide more effective and current advice regarding our clients' financial affairs. 

If your accountant isn't using this technology, they may be advising you based on out of date information.

If you'd like to know more, contact us here.