The two companies have existing relationships in the UK and South African markets.
"Decision Australia's expertise and focus are a perfect fit for the Board capability set in Australia," said Board partners and alliances director Christopher Wilkins.
"Their experience and expertise in taking planning to market and then enhancing this with the Board solution set will further reinforce their broad capability in data and strategic consulting to meet the critical decision-making requirements of today's enterprises."
Decision Australia CEO Aiden Heke said "Partnering with Board International is a great step for Decision Australia to enhance our Financial Planning and Analysis offering.
"The role of finance has shifted from predominantly accounting functions into information enablers and strategic partners of the organisation. Board is a market leading decision-making platform that will help our customers achieve goals and make a difference to their businesses."