Aside from reducing your staffing costs, you will save a lot of time. You won't need to participate in any accounting duties.
A professional accounting firm has highly skilled accountants. None of your accounting duties will be too hard for them. They will also help you to solve problems if they occur.
There will be no learning curve on your part because you don’t need to train on how to use complex software.
If your books are well-kept, you can file correct tax returns without missing a deadline