When I was running my publishing company, I used my (sadly, rather inept) accountant exactly five times: once to set me up on my accounting software — a disaster through-and-through — and once a year for the four years to do our taxes.
If I had known then what I know now (businesses that use accountants regularly grow their profits 23% faster!), I would have made an effort to find an accountant that was a much better fit, and I would have consulted them far more frequently.
Here’s a video I made recently for Xero that goes over the critical times when it’s a good idea to hire an accountant.