Reconciliation is not filing
A GST/HST return can be filed quickly and still be wrong in ways that only surface when the CRA asks questions. Year-end reconciliation is the slower, quieter work that prevents that: taking the totals in the books — sales, tax collected, tax paid on expenses — and proving each one against the return line it feeds, before anything is submitted. For an annual filer the stakes are concentrated, because a full year of small classification errors arrives in a single return. For monthly and quarterly filers, the year-end pass is the chance to catch the drift that twelve or four separate filings can hide.
The return's own structure tells you what to prove. Line 101 holds total sales and other revenues. Line 103 holds GST/HST collected or collectible. Lines 106 through 108 build total input tax credits (ITCs) and adjustments. Line 109 is net tax — the amount the whole exercise produces. Reconciliation means each of those numbers has a book total behind it that matches, and a reason written down where it does not.
The three tie-outs
| Return line | What goes there | Book total it must tie to |
|---|---|---|
| 101 | Total sales and other revenues for the period, including zero-rated and exempt supplies, but excluding GST/HST and provincial sales tax | The sales ledger for the period, with tax stripped out |
| 103 | GST/HST collected or collectible on supplies, including tax on paid and unpaid invoices | The tax-collected account in the general ledger |
| 108 | Total ITCs and adjustments — tax paid or payable on business purchases (line 106) plus adjustments that reduce net tax (line 107) | The tax-paid-on-expenses account, supported invoice by invoice |
| 109 | Net tax: total GST/HST and adjustments (line 105) minus total ITCs and adjustments (line 108) | Nothing — this line is proven by the three tie-outs above it, never entered from memory |
The most common year-end differences are boring, which is why they survive: an invoice dated in one period and entered in another, tax recorded on an exempt sale, or a purchase booked with the tax buried in the expense instead of split into the ITC account. Each one shows up as a tie-out that will not close. Work the differences while the year is still open in the accounting file — a difference explained in December is a note in the working papers; the same difference found by an auditor is a reassessment conversation.
The annual add-backs and the documentation sweep
Two cleanups belong specifically to year-end. First, the meals and entertainment add-back: once a year, 50% of the ITCs claimed during the year on meal and entertainment expenses must be added back on line 104 — 20% applies for long-haul truck drivers instead of 50%. Because the ITCs were claimed at full value through the year, this single line is where the year's over-claim is settled. Second, the bad debt rhythm: if a debt you claimed a bad-debt adjustment on is later partly recovered, the GST/HST on the recovered amount is added back in the period of recovery — the original return is not amended to do it. Scan year-end receivables with that in mind before deciding anything is truly uncollectible.
Then sweep the ITC support itself, because an ITC without its documents is a loan from the CRA, not a credit. The documentation requirements are tiered by the size of the sale. At every tier, the record must show the supplier's business or trading name, the invoice date (or the date the tax was paid or became payable), and the total amount paid or payable. For a sale of $100 or more, it must also show the total GST/HST charged — or state that the amount includes the tax — and the supplier's GST/HST registration number. At $500 or more, add the buyer's name, a brief description of what was supplied, and the terms of payment. Pull the year's largest expense invoices and check them against those tiers in December; a missing registration number can usually still be obtained from the supplier in December, and is much harder to chase two years later.
Instalments: the line 110 check
Annual filers carry one extra reconciliation step. If your net tax for the previous fiscal year was $3,000 or more, you may have had to make quarterly instalment payments during the current year — and for a business with branches or divisions filing separate returns, that $3,000 threshold is tested against the whole business's net tax, not each return separately. Those instalments are not ITCs and they are not an expense; on the annual return they are entered on line 110, instalment and other annual filer payments, so the balance owing is reduced by what was already paid.
The instalment arithmetic, worked once: suppose the year's net tax on line 109 comes to $9,600 and four quarterly instalments of $1,000 were paid during the year. Line 110 takes $4,000, and the balance actually payable with the return is $5,600 — not $9,600. Two protections are worth knowing while you reconcile: instalments set at one quarter of the previous year's net tax, paid in full and on time, attract no instalment interest even if this year's net tax turns out higher; and overpaying or paying the next instalment early can reduce or eliminate interest on an instalment that was short or late. One special case: an individual with business income and a December 31 year-end files the GST/HST return by June 15 but must remit net tax by April 30 — and a remittance already made by April 30 is added to instalments on line 110, so it is counted once, in the right place.
Filing clocks by filer type
| Filer type | Return due | Payment due |
|---|---|---|
| Monthly or quarterly | One month after the end of the reporting period | One month after the end of the reporting period |
| Annual, other than a self-employed individual with a December 31 year-end | Three months after fiscal year-end | Three months after fiscal year-end |
| Annual, self-employed individual with a December 31 year-end | June 15 | April 30 |
When a due date falls on a Saturday, Sunday, or a CRA-recognized holiday, a payment received on or before the next business day counts as on time. Most registrants must file electronically, so year-end is also the moment to confirm the filing method still works — before the deadline week, not during it. And if reconciliation turns up an error in a return already filed, corrections have their own channel: a return can be adjusted online in My Business Account once the CRA has finished processing the original (with at least 14 days elapsed for monthly or quarterly returns), provided the period ended no more than four years ago and is not tied to an appeal or audit. A mailed adjustment must be signed by the owner or an authorized representative and include the business number with its RT extension, the reporting period, the corrected amount for each line, and a contact name and phone number.
The reconciliation procedure
- Freeze the period. Finish entering the year's sales and purchase invoices, then work from reports for the exact reporting period — not "the year so far."
- Tie line 101. Compare the sales ledger total, tax excluded, against the draft line 101 — remembering that zero-rated and exempt supplies belong in the total even though no tax was charged on them.
- Tie line 103. Compare the tax-collected account against tax on taxable sales for the period, including invoices issued but not yet paid.
- Tie lines 106–108. Match the ITC account to expense records, then run the documentation tier check on the largest invoices: supplier name, date, total, tax shown, and registration number at $100 and over.
- Post the annual adjustments. Add back 50% of the year's meal and entertainment ITCs on line 104, and review receivables for bad debts claimed or recovered during the year.
- Prove line 110. List every instalment actually paid during the year from bank records — not from memory — and confirm the total is what will be entered for annual filer payments.
- Compute line 109 from the proven lines, compare it with what the accounting software expects, and investigate any difference before filing. Keep the tie-out worksheet with the return; it is the first document an auditor's question should meet.
What success looks like
Success is a one-page worksheet where four numbers — sales, tax collected, ITCs, and instalments — each match a book or bank total, with every remaining difference named and explained. When that page exists, filing is a transcription task that takes minutes, and a CRA query two years from now gets answered from a file instead of reconstructed from memory.
FAQ
Is reconciliation different from just filing carefully? Yes. Filing records the numbers; reconciliation proves them against independent totals first — the sales ledger, the tax accounts, and bank records of instalments paid.
I found an ITC with no proper invoice after filing. What now? Get the supporting document from the supplier if you can; if a filed return needs changing, use the CRA's adjustment process for that period rather than burying the fix in a later return.
Do quarterly filers need a year-end pass too? The instalment and annual-filer items may not apply, but the three tie-outs and the once-a-year meals add-back are annual habits regardless of filing frequency.