6 worked GST/HST Filing-Frequency Change case studies — the position a client typically comes to us with, what we do, and what it is worth. Each is an illustrative example built on the rules that apply to gst/hst filing-frequency change work, not a specific client's file.
Case Study 1 · Backlog brought current
$138,000 Of Arbitrary Assessments Vacated After 3 Years — Cross-Border SaaS Company, Saskatoon
Client: A SaaS company with Canadian and US customers · Where: Saskatoon, Saskatchewan · Engagement: 8 weeks, fixed fee
Arbitrary tax vacated$138,000
Years brought current3
Account statusCurrent
The situation — A SaaS company with Canadian and US customers, Saskatoon, Saskatchewan
3 years of unfiled returns had turned into notional assessments at a SaaS company with Canadian and US customers in Saskatoon, Saskatchewan. Underneath lay HST charged at the home-province rate on sales into four different provinces. Collections had already started.
What we did for A SaaS company with Canadian and US customers, Saskatoon, Saskatchewan
We rebuilt the sales ledger by customer province and applied the correct place-of-supply rate to each stream. We filed corrected returns before the CRA opened a review. We then filed every outstanding year in chronological order so the CRA could vacate the notional assessments cleanly.
The result — A SaaS company with Canadian and US customers, Saskatoon, Saskatchewan
All 3 years were accepted as filed. $138,000 of arbitrarily assessed tax was vacated, collections action stopped, and the account is current for the first time in 3 years.
Case Study 2 · Planning that cut the bill
Remuneration Review Saved $36,500 Across Corporate And Personal Returns — Interprovincial Construction Supplier, Halifax
Client: A construction supplier selling into three provinces · Where: Halifax, Nova Scotia · Engagement: 9 weeks, fixed fee
Combined saving$36,500
ScopeCorporate + personal
Future yearsNo rework needed
The situation — A construction supplier selling into three provinces, Halifax, Nova Scotia
Nothing was wrong at a construction supplier selling into three provinces in Halifax, Nova Scotia. The filings were on time and accurate. What they were not was planned. A registration threshold crossed nine months before anyone registered had never been reviewed.
What we did for A construction supplier selling into three provinces, Halifax, Nova Scotia
We assembled the export documentation, restored zero-rating on the qualifying sales, and reduced the proposed assessment. We ran the numbers across both the corporate and personal returns, so the saving was real rather than deferred into someone else's hands.
The result — A construction supplier selling into three provinces, Halifax, Nova Scotia
$36,500 came off the combined corporate and personal tax bill, and the structure holds for future years without further work.
Case Study 3 · Structure rebuilt
Reorganisation Completed Tax-Deferred, $27,000 Saved Each Year — Multi-Province Online Retailer, Surrey
Client: A multi-province online retailer · Where: Surrey, British Columbia · Engagement: 5 weeks, fixed fee
Annual saving$27,000
Tax on reorganisationDeferred
Elections filedOn time
The situation — A multi-province online retailer, Surrey, British Columbia
A multi-province online retailer in Surrey, British Columbia had outgrown the structure it started with. Input tax credits claimed on the exempt side of a mixed-supply business was the immediate problem. The longer-term one was that the structure blocked the next step.
What we did for A multi-province online retailer, Surrey, British Columbia
We mapped the current structure and modelled the target. Then we brought the nil and missing periods current so the account was clean before the refund claim was filed. The tax-deferred elections were filed on time and the supporting valuations documented.
The result — A multi-province online retailer, Surrey, British Columbia
The reorganisation completed without triggering tax, and the new structure saves approximately $27,000 a year while removing the exposure the old one carried.
Case Study 4 · Scaling without breaking
Scaled To 45 Staff With $124,000 Of Working Capital Freed — Digital Platform Seller, Hamilton
Client: A platform seller collecting tax at checkout · Where: Hamilton, Ontario · Engagement: 8 weeks, fixed fee
Headcount reached45
Working capital freed$124,000
Missed deadlinesZero
The situation — A platform seller collecting tax at checkout, Hamilton, Ontario
A platform seller collecting tax at checkout in Hamilton, Ontario was growing fast, with headcount reaching 45 in eighteen months. The back office had not kept up. Export sales zero-rated with no shipping documentation behind them was the first thing to break.
What we did for A platform seller collecting tax at checkout, Hamilton, Ontario
We backdated the registration to the date the business stopped being a small supplier, remitted the tax owing, and applied for relief on the penalty portion. We built the compliance calendar for the size the business was becoming rather than the size it had been.
The result — A platform seller collecting tax at checkout, Hamilton, Ontario
The business reached 45 staff with no missed remittance and no late filing. $124,000 of working capital was freed in the process.
Case Study 5 · Objection and relief
Notice Of Objection Allowed In Full, $69,000 Reversed — Exempt-Supply Clinic, Winnipeg
Client: A health clinic making exempt supplies · Where: Winnipeg, Manitoba · Engagement: 7 weeks, fixed fee
Amount reversed$69,000
ObjectionAllowed in full
Account balanceNil
The situation — A health clinic making exempt supplies, Winnipeg, Manitoba
A health clinic making exempt supplies in Winnipeg, Manitoba had been reassessed for $69,000. 22 days were left on the objection deadline. The reassessment rested on a sales tax account filed annually while the CRA had moved the business to quarterly.
What we did for A health clinic making exempt supplies, Winnipeg, Manitoba
We filed the objection inside the deadline with a complete submission rather than a placeholder. Alongside it, we filed the section 156 election for the related registrants, so supplies between them stopped carrying tax that served no purpose but cash-flow drag.
The result — A health clinic making exempt supplies, Winnipeg, Manitoba
The appeals officer allowed the objection in full. $69,000 was reversed and the account returned to a nil balance.
Case Study 6 · CRA review defended
$125,000 Proposed Adjustment Withdrawn In Full — Late GST/HST Registrant, Ottawa
Client: A seller who crossed the registration threshold before registering · Where: Ottawa, Ontario · Engagement: 5 weeks, fixed fee
Adjustment withdrawn$125,000
File closed in5 weeks
Penalties assessedNone
The situation — A seller who crossed the registration threshold before registering, Ottawa, Ontario
A seller who crossed the registration threshold before registering in Ottawa, Ontario received a proposal letter opening a review of GST/HST filing-frequency change. The CRA had identified management fees between two related registrants carrying tax that only ever went out and came back. It proposed an adjustment of $125,000, with 30 days to respond.
What we did for A seller who crossed the registration threshold before registering, Ottawa, Ontario
We treated the response as an evidence exercise rather than an argument. We tested the quick method against the account’s actual input tax credit history and stayed on the regular method where the credits were worth more. We then indexed every supporting document against the specific line the auditor had questioned.
The result — A seller who crossed the registration threshold before registering, Ottawa, Ontario
The proposed adjustment was withdrawn in full — all $125,000 of it. The file closed in 5 weeks with no change to the assessed amounts and no penalty.
Reviewed by Udit Gupta, Founder and Tax Accountant for the 2025 tax year. These case studies are illustrative worked examples composed from the CRA rules that apply to this type of work, not specific client files; figures are representative and outcomes depend on your own facts.
