About Business Addition

At Business Addition, formerly Start IT Consulting, we ensure your financials reflect exactly where you are today so you can confidently plan where you want to be tomorrow.


We treat every client’s business as our own. We see your vision and help you achieve it.


We combine the best of your strengths with our expertise to provide a balanced approach to building your business.


We get excited about future proofing your systems and creating practical solutions that are easy to understand.

Who We Are

We Are Registered BAS Agents & Qualified Bookkeepers

More than this though, we are your partners in business with a commitment to adding value to your business. Providing qualified onsite and offsite bookkeeping and busines support, we service clients in a wide range of sectors throughout Cairns, Queensland and farther afield. We take care of all your general bookkeeping requirements, as well as Payroll Services, Accounting Software Support, and a suite of other progression-based services so you can focus on what’s most important to you – developing your business.

Years in Business

Formerly Start IT Consulting, Business Addition has supported hundreds of local businesses since its inception.

Happy Client Star Rating

Feedback from happy clients is the best indicator that Business Addition (formerly Start IT Consulting) continues to provide top-quality service and results.

Expert BAS Agents

Our team of Registered BAS Agents have the knowledge and experience to take care of ATO related obligations and compliance.

Our Story

Two decades in business, first as Start IT Consulting and now Business Addition, affords a consultancy like ours an in-depth understanding of what makes a good business great. 

We started out with a passion for providing general and rescue bookkeeping services following the introduction of GST in 2000. Our aim was to take the load off busy business owners and maintain their business books.

Our handling of their data and the onerous and ongoing daily responsibilities of running a business gave our clients back the time and energy to focus on the aspects of their business that inspired them and the space to strive for excellence.

It also meant they had a true and accurate picture of where their business was at and where it was heading financially. This kind of insight gives a business owner the confidence to either push forward or the knowledge to make necessary changes to ensure long-term success. 

As our business has developed, so too has the range of support we extend to our clients. 

Today, we offer a holistic and comprehensive consultancy-based service that seeks to assist and direct our clients in any area of business that requires attention.

“We purchased Australian Tourist Publications nearly 15 years ago and Heather has been an integral part of our business from the beginning. Her knowledge and professionalism are faultless.”

Jackie Honour

Managing Director

“For the last 14 years we have used the services of Heather Sanders and Business Addition (formerly Start IT Consulting) for our bookkeeping and BAS Agent. Without Heather and Business Addition, we would not be where we are today.”

Mark Shergold


Join Us

Comprehensive Support for Our Clients

At Business Addition, we provide a holistic approach to supporting you in business. Part of this is the flexibility to choose what services will best serve your goals. Our added option of Tailored Packages ensures the support and advice you want is available when you need it most and at no additional cost.

Join Us

We offer a free 45-minute initial consultation either online, over the phone or face to face. The choice is yours.


Our Team of Experts

Any business is only ever as good as the team on the ground. At Business Addition, our team is dedicated to providing financial solutions that will benefit you and your business. We work cohesively to support you through every stage of your business development.

Heather Sanders

Heather Sanders


Leading the Business Addition team is Registered Bas Agent Heather Sanders.

Heather completed a Degree in Business Management in the UK, before settling here in Cairns, Australia in 1988.

Heather was a driving force behind Start IT Consulting since its inception in 2000, assuming sole ownership in 2013. She holds a Certificate IV in Training and Assessing and a Certificate IV in Financial Services (Accounting), has been a Reckon Account Accredited Professional Partner since 2003. She is also Xero Certified. Heather is your first contact with Business Addition, ensuring a smooth transition with a skillful analysis of your individual requirements. She specializes in creating customized reports and addresses the pain points of your record keeping with simple solutions that are easy to understand.

Heather’s unwavering focus and determination sees her study your business processes, streamlining and questioning as she goes until the optimum financial results are achieved.

Rosslyn Johnsson

Rosslyn Johnsson

Registered BAS Agent

Specialising in client liaison, Ros has been with the Business Addition team since January 2018. A Registered BAS Agent, Ros is a member of the Australian Bookkeepers Network, holds a Certificate IV in Finance (Bookkeeping) and is also a Xero Certified Advisor.

Working as a Bookkeeper since 2014, Ros is constantly developing her skills and her qualifications. Currently completing a Bachelor of Accounting through CQU, Ros in on track to become a qualified Accountant by midway through 2021.

Leonie-Jane Mahnken

Leonie-Jane Mahnken

Registered BAS Agent

In addition to her work as a Registered BAS Agent, Leonie-Jane is a specialist in Administration Support. With a focus on Business Support and Bookkeeping, Leonie-Jane has some 30 years’ experience in a broad cross section of roles, including Project and Contract Administration, Office Management, Executive Assistance, Board Liaison, Procurement and Bookkeeping.

Leonie-Jane holds a Certificate IV in Accounting, a Certificate IV in Bookkeeping, and a Certificate III in Micro Business Operations, as well as a Certificate IV in Communication (Counselling), Certificate III in Travel & Tourism and Certificate III in Business Administration. Her background has seen her work as a trusted and valued employee for major employment agencies in Cairns, contracted to a variety of State, Local and Federal Government and Private Businesses.