6 Oshawa tax and accounting engagements in full — what the client came to us with, what we did, and what it was worth. Each one is specific to Oshawa and its provincial tax regime, not a general example.
Case Study 1 · Objection and relief
$16,500 Of Penalties And Interest Cancelled On Relief — Textile Manufacturer, Oshawa
An assessment of $16,500 landed at a textile manufacturer in Oshawa, Ontario following a desk review. The auditor had not seen the records behind instalments still calculated on a year the business had long outgrown.
What we did
We rebuilt the sales ledger by customer location, applied the correct place-of-supply rate to each stream, and filed the adjusted HST returns, then set out the legislative basis for the position alongside the documents supporting it.
The result
$16,500 of penalties and interest was cancelled under the taxpayer relief provisions, and the underlying assessment was adjusted to match the filed position.
Case Study 2 · Backlog brought current
Collections Halted And $86,000 Cut From A 6-Year Backlog — Plastics Moulder, Oshawa
By the time a plastics moulder in Oshawa, Ontario called, 6 years were outstanding and the CRA had assessed on estimates. Underneath it sat sector-specific exposure the previous accountant had not seen before.
What we did
We reconstructed the records year by year and assessed and claimed Ontario Made Manufacturing Investment Tax Credit alongside the federal return. Each filing replaced an arbitrary assessment with a real one.
The result
The account is current. Filing on real numbers rather than CRA estimates reduced the balance by $86,000, and a relief application addressed part of the accumulated interest.
Case Study 3 · Missed incentive claimed
Incentive Review Recovered $90,000 Across 4 Open Years — Marketing Agency, Oshawa
An incentive review at a marketing agency in Oshawa, Ontario started from a simple question: what has never been claimed? The answer ran to 4 years, driven by Ontario Made Manufacturing Investment Tax Credit eligibility that had never been assessed.
What we did
We assessed and claimed Ontario Innovation Tax Credit alongside the federal return, documenting eligibility to the standard a reviewer would apply rather than the standard a claim form requires.
The result
The credits produced $90,000 across the open years, and the tracking now in place means the following year's claim is documented as the work happens rather than reconstructed afterwards.
Case Study 4 · Scaling without breaking
Growth Handled Without A Missed Filing, $46,000 Freed — Benefits Consultancy, Oshawa
A benefits consultancy in Oshawa, Ontario was opening in a second province — different filing obligations, a different payroll regime, and out-of-province sales billed at the ON rate instead of the customer’s already in the file.
What we did
We registered the provincial payroll account, caught up the outstanding remittances, and applied for relief on the penalty and put monthly reporting in place so the owner could see the cash effect of growth while there was still time to act on it.
The result
Growth was absorbed without a compliance failure. $46,000 of cash was released, and the monthly reporting now flags a problem while it is still small.
Remittances at an insurance brokerage in Oshawa, Ontario were consistently late by a few days, which was enough to trigger penalties every quarter. Behind it sat 13% HST charged on every sale regardless of where the customer was located.
What we did
We recalculated the corporate tax at the 12.2% combined small business rate and rebased the instalments on the current year, then moved the remittance dates into a scheduled process rather than a monthly decision.
The result
Penalties stopped from the following remittance onwards, and $74,000 of overpaid instalments was refunded.
Case Study 6 · Deadline rescue
Filed On Time From A Standing Start, $32,500 Penalty Avoided — Optometry Practice, Oshawa
Client: An optometry practice · Where: Oshawa, Ontario · Engagement: 7 weeks, fixed fee
Penalty avoided$32,500
Turnaround7 weeks
FiledOn time
The situation
An optometry practice in Oshawa, Ontario came to us 7 weeks before its filing deadline with instalments still calculated on a year the business had long outgrown. A late filing would have triggered a penalty of roughly $32,500 before interest.
What we did
We worked backwards from the deadline. We rebuilt the sales ledger by customer location, applied the correct place-of-supply rate to each stream, and filed the adjusted HST returns, prioritising the items that actually gated the filing and deferring everything that did not.
The result
The return was filed on time and complete. The $32,500 penalty never arose, and the compliance calendar we set means the next deadline is scheduled rather than discovered.
Reviewed for the 2025 tax year by Udit Gupta, Certified Tax Accountant. Figures describe representative engagements of this type; outcomes depend on your own facts. Client names and identifying details are omitted for confidentiality.
