You do not need a debit and credit to know the cash is wrong
Owners are told the books are a specialist's language. Some of the work is. The warning signs are not. If you can read a bank balance and a loan statement, you can tell when the books have drifted.
This is not a request that you fix the file yourself. It is a way to decide whether you need a cleanup before a preparer, a lender, or a buyer relies on it. If the books are current and you want them kept that way after the cleanup, monthly bookkeeping is a separate engagement. Do not mix the two in your head yet. First find out if the file you have is true.
Four checks that do not require an accounting background
Compare the cash in the books to the bank on the same day. Not "roughly." The same day, the same account. If the books say $40,000 and the bank says $11,000, the books are wrong, even if every other page looks tidy. Outstanding checks can explain a difference. A difference nobody can list is not outstanding checks. It is a file that does not tie.
Look at loans. If you paid a truck off and the books still show the full balance, the books are wrong. If you borrowed and the books show the deposit as sales, the books are wrong in a way that inflates profit. You know whether you bought a truck. You do not need a chart of accounts to know the books should mention it.
Look at profit against the bank. If the books say you made far more than you deposited, ask where the money is. It might be receivables, and that is fine if customers actually owe it. It might be deposits that were never recorded as borrowed money. You are allowed to ask for the bridge from profit to cash in plain language.
Look at your own cards and draws. If personal groceries, or transfers to yourself, are sitting in supplies or miscellaneous, the expenses are not the business. You will feel this one without a class. The total will not match the way you actually spend.
What those checks mean, and what they do not
One difference can be a timing item. A pattern of differences means the file should be cleaned or rebuilt before someone else uses it. You have not diagnosed the whole year by spotting cash. You have earned the right to stop trusting the printout.
The next step is a diagnostic, not a weekend of retyping. The diagnostic is $499. It is a read-only review: findings with dollar amounts, and a fixed quote to fix them. The $499 credits toward the work if you approve it. A licensed CPA reviews the package that comes out of that work. You are not expected to learn the entries in order to authorize them.
Catch-up bookkeeping versus monthly bookkeeping helps you name which product you need. A file that fails the cash test is not a candidate for "just keep going next month." The history has to be made true first.
When the books might be fine
If cash matches, the loans match, the profit could plausibly have landed in the bank or in invoices you recognize, and you are not staring at personal spending in the supplies account, the books may be fine. You can still want a second set of eyes before a loan or a sale. That is a diagnostic, not a confession that everything is broken.
If you are only a few weeks behind and the prior months tied, you may need the current month closed, not a reconstruction of three years. Say that when you ask for the quote. Scope follows the months that fail, not your anxiety about the ones that pass.
What to do after you spot it
Do not delete transactions until someone has tied the account. Deleting the number you dislike does not create a tie to the bank. It creates a second problem.
Do not wait for the preparer to discover it in March if you can see it now. Send the statements. Read the findings. Approve a cleanup only for the scope the findings support.
If the cleanup gets you current and you want the next months kept current, that is monthly bookkeeping, scoped on its own. One problem at a time. The first problem is whether the books you already have are true.