Doing your own books: when it works and when it starts costing you

Doing your own books works, and keeps working, as long as three things hold: the transaction count is low enough that you finish in about an hour a week, every bank and credit-card account is reconciled to a statement every month, and nobody else’s money runs through the file — no payroll, no inventory, no holdbacks, no second currency. Owners watch the first condition. The second decides the outcome. A file that is entered but never reconciled is not a set of books; it is a list of transactions that agrees with nothing.

Which is why the cost of doing it yourself almost never arrives as a bookkeeping problem. It arrives twice, late: as cleanup priced at year-end, and as decisions nobody could make until somebody knew the real number — by which point the year had closed.

Where doing your own books genuinely works

One bank account, one credit card, invoices you raise yourself, no employees. A consultant billing six clients a month has perhaps forty transactions to code and two accounts to reconcile, and an hour on the first Monday of the month covers it with room to spare. No rule requires you to hire anyone. The obligation is to keep records adequate to support what you filed and produce them on request, and what that means in practice is identical whether you keep the file or someone else does.

There is a second argument for it, usually dismissed too quickly. An owner who codes their own transactions knows things no monthly report communicates — which customer always pays at sixty days, how much of a good month was one invoice. That knowledge is worth something, and buying it back later is expensive.

So the honest version of this decision is not whether you are the sort of person who does their own books. It is whether the file still closes.

Reconciliation is the test, not tidiness

A tidy file can be badly wrong. A file with every transaction categorized and attached to a receipt is still unproven until its closing balance matches the bank’s. Reconciliation is the only step that catches what is not there: the deposit the feed imported twice, the cheque that never cleared, the supplier charge that went on a personal card and never made it in at all.

The signals that DIY has stopped working are mechanical rather than emotional, and there are six worth watching:

• Months you cannot close. If December’s balance in the file does not equal December’s statement, every figure drawn from it — revenue, expenses, the tax you are accruing — is a guess wearing a decimal point.
• An uncategorized or “ask my accountant” account that grows. It is a holding pen, and holding pens fill.
• Receipts that live in a bag rather than in the file. The ledger line is not the record; the invoice behind it is.
• Money out that you cannot name. Anything that is not salary, not a declared dividend and not a reimbursement lands in the shareholder-loan account, which carries its own repayment deadline and its own tax.
• A GST/HST return filed from a number nobody has tested. Monthly and quarterly filers are on a one-month clock after each period ends; the file does not get a grace period to be right.
• The month you hire someone, start carrying stock, begin holding back on contracts, or take your first invoice in another currency. Each adds a subledger, and subledgers are where self-taught bookkeeping generally stops being enough.

One signal is not on that list, and it is the one owners use most: revenue. There is no dollar figure at which DIY becomes wrong — a C$900,000 consultancy with forty transactions a month can run cleaner than a C$200,000 repair shop with four hundred.

Cleanup is rework, and rework prices like rework

Reconstructing nine months costs more than keeping nine months would have. The reason is context, not competence. Whoever does the cleanup was not there when the cheque was written, so every unexplained line becomes a question, and you answer it in April about something that happened the previous June. Fifty such questions is a week of your time that nobody quoted you.

The tax cost runs alongside it. A deduction can fail for want of the document even where the ledger entry and the bank line both exist. GST/HST credits missed in the period they belonged to are generally claimable later, but the window runs on a time limit rather than on your intentions. Instalments calculated off an unreliable base are wrong in one of two directions, and the method for setting them assumes a number you can trust. Where records are inadequate outright, the CRA can determine income by other means — deposits, net worth, industry ratios — and you are then arguing against its estimate rather than presenting your own.

The largest cost is the quietest. The T2 is due six months after year-end, but the decisions worth money — the compensation mix, whether an asset goes into service before the date, what to do with a shareholder balance — all expire at the year-end itself. A file that closes in March cannot inform a decision made in December.

An illustrative example: nine unreconciled months

Round numbers, December 31 year-end. An incorporated HVAC service business, 2026 fiscal year, quarterly GST/HST filer. The owner keeps the books himself, bank feed connected, and codes transactions most Sundays. The last time he reconciled to a statement was March.

At December 31 the file shows C$480,000 of revenue. In January it is reconciled properly, and two things fall out.

C$22,000 of customer deposits appear twice — the feed brought them in and he also entered the cheques when they arrived. Real revenue is C$458,000. The corporate tax he had been accruing was overstated, which sounds like good news until you notice the four GST/HST returns were filed on the inflated sales figure, so the over-reported periods have to be corrected on the returns they belong to, not netted quietly into the next one.

C$18,000 of credit-card charges sit uncategorized. C$12,000 turn out to be parts and fuel with receipts in the truck. C$6,000 has a statement line and nothing else. That C$6,000 comes out of the deduction — at the federal rate of 9% on the first C$500,000 of active business income for an eligible CCPC in 2026, C$540 of federal corporate tax on money he genuinely spent, before the provincial rate on top.

And the C$95,000 he drew during the year was coded to draws, so it sits in the shareholder-loan account waiting for a decision that could only have been made in December. Nobody could set the salary and dividend mix at year-end, because nobody knew whether the year was C$480,000 or C$458,000 until March.

None of that is untidiness. Every transaction was in the file, coded, on time. Reconciliation was the missing step, and it is the only one that catches a deposit counted twice.

The hybrid most owners actually want

There is a middle setting, and it is where a lot of engagements sit for a year or two: you keep the daily entry, someone else closes the period. You capture receipts and code transactions as the week runs. The chart of accounts is set once, properly, so the coding decisions that carry tax consequences are already made before you meet them. Then the accounts are reconciled and the period closed on a quarterly cycle, with coding fixed while the year can still be changed rather than after it cannot.

Be precise about the word: this is a look at your file, not a review engagement. The assurance kind of review is signed by a CPA firm, and we are not one — where a lender or a bonding agent asks for that, the signing firm is a separate appointment.

The hybrid is usually a stage rather than a destination. It ends the way it should, at the month the daily entry stops fitting into the week.

What Cadence does

We look at the file before quoting, because the file sets the fee. Where records are in reasonable shape — a clean spreadsheet is genuinely fine — the annual-returns package starts at C$3,000 and covers the corporate and owner returns, working from what you keep. Where nine months need reconciling first, that is remedial work: we scope it and price it once at the estimate, rather than finding it in March. The quarterly close-and-review version sits in the year-round packages alongside the planning it feeds, with ranges on the pricing page. If you would rather stop entering transactions altogether, bookkeeping and reconciliations run through the same team that files the return. Auto, repair and local-service shops tend to arrive on the hybrid and move off it within a couple of years, which is a reasonable order to do it in.