The 60-second answer
Per-seat PBX pricing multiplies a rate by your headcount every month, so the bill grows as you hire. Flat-band pricing charges one fixed amount up to an extension ceiling. Per-seat is cheaper at the bottom of a band; flat bands win above roughly 11 extensions and stop the bill moving entirely.
Two pricing models, one hidden variable
Nearly every business phone quote in Canada arrives in one of two shapes. Per-seat: a rate, multiplied by a headcount, every month. Flat-band: one number, covering everyone up to a ceiling.
Buyers compare them by plugging in today's headcount, which is precisely the input that guarantees a wrong answer. Headcount is not a constant. It is a monthly series that moves with the business and the labour market [2], and a per-seat contract is a bet that it will not move much. Most three-year phone contracts outlive the org chart that was used to price them.
The arithmetic, entry band
Market rates in Canada sit in two clusters. Full-service hosted voice, where the provider also sells you the lines and the numbers, runs $20 to $35 per seat per month. PBX-only service, where you bring your own trunk, runs $8 to $15 per seat. MapleReceptionist sells the second category at $99 CAD per month for up to 10 extensions, which is $9.90 per extension at the ceiling.
| Extensions | Per-seat @ $9 | Per-seat @ $12 | Per-seat @ $25 (full service) | Flat band |
|---|---|---|---|---|
| 4 | $36 | $48 | $100 | $99 |
| 8 | $72 | $96 | $200 | $99 |
| 10 | $90 | $120 | $250 | $99 |
| 18 | $162 | $216 | $450 | $219 |
| 25 | $225 | $300 | $625 | $219 |
| 40 | $360 | $480 | $1,000 | $399 |
| 50 | $450 | $600 | $1,250 | $399 |
| 85 | $765 | $1,020 | $2,125 | $699 |
| 100 | $900 | $1,200 | $2,500 | $699 |
All figures CAD per month, before HST. Read down the columns and the pattern is consistent: per-seat at the aggressive end of the market beats a flat band only in the lower half of each band, and loses at every ceiling. At the ceiling of each band the flat price works out to $9.90, $8.76, $7.98 and $6.99 per extension respectively — the effective rate falls as you grow, which is the opposite of what per-seat does.
Seat creep, the line item nobody audits
Here is what a per-seat model actually bills for, as opposed to what buyers assume it bills for:
- The employee who left in March whose extension is still provisioned in September.
- The phone in the workshop that three people share.
- The extension at the loading dock.
- The second handset a manager keeps at home.
- The boardroom phone.
- The spare that was configured for a contractor once.
None of these are people. All of them are seats. A twelve-person business routinely runs sixteen to eighteen extensions, and under per-seat billing every one of them is a recurring charge that requires someone to notice and remove it. Under band pricing the same extensions cost nothing until they push you past a ceiling — which means the workshop phone, the dock phone and the boardroom phone stop being budget decisions and go back to being operational ones.
Per-seat pricing quietly makes “should this room have a phone?” a finance question. That is a bad question to have to ask about a $10 line item, and businesses answer it by not putting a phone where one belonged.
The three-year model
A fair comparison needs three inputs, not one. Current extensions, realistic extensions in 36 months, and the non-human extensions you already have or will want. Work an example: a business at 14 real staff today, planning 22 in three years, with 5 shared and common-area phones.
| Year 1 (19 ext) | Year 2 (23 ext) | Year 3 (27 ext) | 36-month total | |
|---|---|---|---|---|
| Per-seat @ $12 | $2,736 | $3,312 | $3,888 | $9,936 |
| Flat band | $2,628 (25-band) | $2,628 | $4,788 (50-band) | $10,044 |
Almost identical — and that is the honest result, not a rigged one. The band model does not win on headline arithmetic in every scenario. What it wins on is that two of those three years cost exactly what you were told they would cost at signing, and the third increase arrived at a renewal date with notice rather than as a line on a bill you had already paid.
There is a second input the table cannot show. A per-seat rate quoted today is usually the current rate, not a contractually fixed one. Over three years of Canadian consumer price movement [6], a rate free to rise and a headcount free to rise compound in the same direction. Ask explicitly whether the per-seat number is fixed for the term. If the answer is vague, the model above is optimistic.
Where per-seat genuinely wins
Be fair to it. Per-seat is the better buy when:
- You are a stable four- to eight-person business with no growth plans and few shared phones. At six real extensions and $9 a seat, $54 beats $99 and nothing in this article changes that.
- Your headcount is seasonal and your provider genuinely bills down as well as up. Some do. Many bill up immediately and down at renewal, which is not the same product.
- You need only a handful of extensions but the full-service bundle — numbers, minutes, SMS — and you would otherwise buy those separately anyway.
The last point deserves emphasis. Flat-band PBX-only pricing excludes numbers and DIDs, SMS and texting, and AI call handling by design. They are separate products at separate prices. Comparing a $99 band against a $25-per-seat full-service quote without adding your number costs back is not a comparison, it is a category error.
What the tax does to each
Nothing differential, but worth stating plainly because it comes up. A hosted PBX subscription is a taxable supply under the Excise Tax Act [5], and GST or HST is added at your provincial rate at checkout [4]. Either model is a current expense, deductible in the year incurred [3]. The only practical difference is predictability: a fixed band gives you a tax figure you can forecast for the term, while a per-seat bill produces a tax amount that tracks headcount.
How to compare two quotes in ten minutes
- Count your extensions, not your employees. Walk the building.
- Add the extensions you would create if they were free. That number is real demand your current pricing is suppressing.
- Project 36 months of headcount honestly, not conservatively.
- Multiply the per-seat rate by the year-3 extension count, not today's.
- Ask, in writing, whether the per-seat rate is fixed for the term.
- Ask what is excluded from both quotes: numbers, minutes, SMS, AI handling, setup, moves-and-changes labour.
- Compare totals across 36 months, with setup included.
Setup on the flat bands: $350 at the entry band or $250 with a 12-month commitment, then $750, $1,200 and $1,900 at the 25, 50 and 100 bands. Roughly 30 to 60 minutes of administrative changes per month are included, which is the line most per-seat quotes bill hourly.
Bottom line
Per-seat pricing is cheaper when you are small and staying small. Flat-band pricing is cheaper at the top of every band, gets cheaper per extension as you grow, and removes headcount from your phone budget entirely for the length of a term. Most Canadian establishments sit under 100 employees [1], which is the full range the four bands cover — $99, $219, $399, $699 CAD per month, plus HST, with the number known before you sign and unchanged until renewal.