Your accountant gives you a tax P&L. Your business needs an operations P&L. They are not the same thing.
A tax P&L is optimized to minimize what you pay the government. It bundles owner compensation into "salaries," treats depreciation as a line item, and generally hides the true operating picture. That's fine for the tax return. It's useless for running a business.
An operations P&L separates owner wages from everyone else's, strips out non-cash charges like depreciation, and shows you what your business actually does month-over-month. That's what you need to make decisions.
If the only P&L you look at is the one your accountant prepares at year-end, you're flying blind eleven months out of twelve.