Bookkeepers and tax preparers do different jobs, and confusing the two is what makes tax season expensive. A tax preparer files your return using your financial records. A bookkeeper produces those records during the year. When the records do not exist, the preparer has to build them first — at their rate, under a deadline, with less context than you have.
The single most effective preparation is a monthly close that actually happened. If each month was categorized, reconciled, and reported as it passed, tax preparation becomes a handoff rather than a project. Your preparer receives a finished Profit & Loss and Balance Sheet and works from them directly.
Beyond the books themselves, a few categories reliably cause problems. Vehicle use requires a mileage record kept contemporaneously, not estimated afterward. Home office deductions require the square footage and the expense basis documented. Meals and entertainment have specific rules on deductibility that depend on circumstances your records need to capture at the time.
Owner draws and contributions are another recurring source of confusion. Money you take out of the business is not a business expense, and money you put in is not revenue. Miscoding either distorts both your profit and your equity position, and it is a correction that gets caught late and awkwardly.
If you have employees or subcontractors, payroll and contractor payments need to reconcile against the forms you issue. A mismatch between what your books say you paid a subcontractor and what the corresponding form reports is the kind of discrepancy that invites questions worth avoiding.
None of this requires you to become an accountant. It requires the year's records to be maintained as the year happens. Businesses that do that experience tax season as an administrative step. Businesses that do not experience it as a reconstruction project with a legal deadline attached — and pay accordingly.