Contact details


02 6736 1033


02 6736 2529



212 Rouse Street, Level 1
Tenterfield, NSW 2372

PO Box 78



Contact Us


02 6736 1033


02 6736 2529



212 Rouse Street, Level 1
Tenterfield, NSW 2372

PO Box 78



Online Enquiry

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About Us

TDG Business Services (formerly TDG Associates) was founded by Alan Donges in 2009 after he retired from 28 years with accounting firm Roberts & Morrow, including 18 years in the partnership. The goal of TDG was to provide local, tailored accounting and business services to the Tenterfield and surrounding community.


Based in a rural area, we have first-hand knowledge of the issues that primary producers and businesses face in this area, and many of us live on the land ourselves. We are also affiliated with Westlawn Finance and share office space with them, making it easy for you to chat with them if you need to obtain a loan.


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Why choose a Chartered Accountant?

Chartered accountants undergo the most rigorous training program following university.  A chartered accountant is an internationally recognised designation, and these accountants are required to maintain very high ethical and professional standards. They are also required to undergo ongoing professional education.


Not all accountants are chartered accountants.

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Our Team


Alan Donges (Principal)

With over 35 years of experience in public practice and the finance industry, Alan is a fellow of the Institute of Chartered Accountants in Australia. Alan enjoys meeting with his clients face-to-face and often travels to see them.


Alan launched TDG Associates in 2009 after retiring from Roberts & Morrow, where he worked for 28 years, including 18 years in the partnership. In 2013, Jason Halliday joined the TDG partnership, and the company was rebranded to TDG Business Services.


Alan’s professional interests include small business management and taxation, superannuation and retirement planning, and the interaction of IT systems within the industry.


Married to Michelle, Alan has five children and when he has time is a keen cricketer, golfer, and rugby player.



  • Fellow of the Institute of Chartered Accountants of Australia
  • Certified Practicing Accountant
  • Registered Tax Agent
  • Justice of the Peace
Donna Simpson

Donna Simpson (Manager)


Donna has over 17 years of experience working in accounting and taxation.  Upon graduating from UNE Armidale with a Bachelor of Commerce (majoring in Accounting and Human Resource Management), Donna joined Roberts & Morrow in 2000 working in the Tenterfield office. 


Donna finished her CA qualification to become a member of the Institute of Chartered Accountants in 2004, before travelling and working in Canada for 12 months.  Since coming back to Australia, Donna worked in Brisbane and Melbourne as a Business Services Manager and In-House Business Services Advisor.


Having grown up in Ballandean and her family still farming now, Donna has life experience not only in agriculture but an array of industries such as hospitality, mining, real estate, property development and project management.


Donna spends her spare time being mum to Bronson.


Zac Curry (Accountant)

Zac joined TDG in 2014 following the completion of his HSC at the local high school. Zac is in the process of completing his Accounting degree online through the University of New England in Armidale.


Still finding his niche, Zac is enjoying experiencing first-hand the wide range of services we are able to offer and learning from the senior mentors at our firm.


Zac enjoys the rural lifestyle the Tenterfield community has to offer and spends his spare time on the land, motor bike and push bike riding, as well as water-skiing.

John Donges

John Donges (Junior Accountant)

John has over 30 years of experience working in finance and accounting and  has broad ranging experience with many ASX100 companies and large family companies from livestock transport, to mining, to travel, to name a few.


He completed his Bachelor of Business through the University of Southern Queensland, by distance education in 1994.


John’s professional interests include computer system integration as well as small business management—roles he considers go hand in hand.


Having worked across vast swathes of Queensland and New South Wales in his working life, he considers the Border districts home.



Amy Trudgian (Administration Manager)

With a background in administration work, Amy joined our admin team in 2011. She has recently taken up the challenge of joining our rank of accountants and is enjoying learning from our skilled senior staff members as well as attending external training courses.


Amy and her partner Terry keep busy taking their two kids, Seth and Ruby, to various activities and sporting events. When Amy has spare time she enjoys cooking, reading, fishing, and four wheel driving.


Dannielle Williams (Administration)

Dannielle is the newest member of the TDG team, joining the administration team in 2017. Her primary role is customer service—if you come to our front desk, Dannielle will help you get set up with what you need.


Dannielle worked for 35 years in hairdressing, and was a small business owner for 13 of those. She is a people person and enjoys volunteering in the community and learning new skills.


When she has spare time, Dannielle enjoys camping and reading murder mysteries. She is married to Mike and has two sons, Aidan and Liam.

Lynne Dearden

Lynne Dearden (Administration)


An interest in bookkeeping most of her working life, Lynne finds figures challenging and balancing the figures keeps her brain working. Outside of working she enjoys the cinema, reading, walking, knitting  and watching TV.