When transactions are missing, duplicated, misclassified or unreconciled, every later decision becomes less reliable.
Reconciliation creates confidence
Bank, credit-card, loan and payment-platform accounts should be reconciled to statements. Unexplained differences need review.
Classification affects the story
Revenue, cost of goods, payroll, owner draws, debt principal, interest and capital purchases should be recorded consistently.
Accruals and timing matter
Depending on the business and reporting method, receivables, payables, inventory, prepaid expenses and deferred revenue may need to be understood.
Reports should agree with reality
A profit and loss statement, balance sheet, tax return and bank activity should be explainable together. Large differences need documentation.
Bookkeeping cleanup and tax work should be completed by appropriately qualified professionals for the scope involved.