Our bank balance in QuickBooks never matches what's actually in the account
When nobody reconciles the accounts every month, the balance shown in QuickBooks drifts away from the real bank balance. A supply house charge on a card that got paid off twice, a customer deposit that hit the bank but never got logged, or an outstanding check all compound over time into a gap nobody can explain.
Once that gap opens, every report pulled from QuickBooks, including the profit and loss statement your tax preparer relies on to file your return, is built on numbers that do not actually match your bank.
This shows up at the worst time, right when you are applying for a truck loan or filing your tax return, and tracking the discrepancy down transaction by transaction under a deadline usually means paying rush fees to whoever has to fix it.