Suggest when should Bell Mountain buy the new accounting system?

Bell Mountain should buy the new accounting system when it meets all of their requirements in terms of functionality, usability and cost-effectiveness. They should also assess how this system compares to existing options on the market and ensure that it will provide them with sufficient ROI over time. Additionally they need to consider any potential training or support costs associated with onboarding the new software to ensure there are no surprises down the line.

Once Bell Mountain has established that this is indeed a viable option they can begin considering timing; typically businesses look for opportunities such as year-end or tax season when they can take advantage of vendor discounts while simultaneously easing transition processes by taking advantage of slower periods. However if Bell Mountain requires immediate access to features not available in their current solution then waiting may not be an option and purchasing the new system immediately may be necessary.