Why does my business phone bill keep changing?

Start with three bills, not an argument

Before you phone anybody, print three consecutive invoices and write every line item into three columns on one sheet. Most phone billing mysteries die in fifteen minutes at a kitchen table, because you are looking for three specific things: a line that appears in one month and not the others, a line that changed while nothing you did changed, and a line whose name you cannot explain to another person.

Do this first because it changes the conversation. "My bill went up" invites a general answer. "This line appeared in July, was not on May or June, and I did not order anything in July" invites a specific one.

Reason one: something is billed per use

Any charge tied to how much you use will move with how much you use. Long-distance minutes, calls to numbers outside your plan, extra recording storage, a per-minute rate after some included allowance runs out.

This is legitimate, and it is also the category most likely to be quietly enormous once a year, when someone spends a fortnight ringing suppliers overseas. The question to ask is not whether usage charges exist but which parts of your service are metered at all, because a service with nothing metered has a bill that cannot drift.

Reason two: you changed something mid-cycle

Add a person on the eleventh, remove one on the twenty-fourth, and your invoice will carry part-month amounts for both. That produces a bill that matches neither the old figure nor the new one, and it usually arrives with no explanation attached.

Proration is honest arithmetic, but it means a single month's invoice is a bad basis for judging a price. Wait for a full clean cycle before deciding you are being overcharged. How providers count people in the first place, and why the count matters more than the rate, is covered in how to count extensions and choose a band.

Reason three: tax, and where your business sits

Sales tax on a phone service is not a fixed decoration on the bottom of the invoice. The Canada Revenue Agency states that the rate of tax to charge depends on the place of supply, and illustrates it with a Vancouver store delivering to Toronto charging the Ontario rate because that is where the supply is made [3]. So a change of billing address, business address, or the province a service is delivered to can move the tax line while nothing about your phones changes at all.

There is a second, subtler case. Whether a supplier charges tax at all depends on their own registration status: the CRA's small supplier test runs over four consecutive calendar quarters, a supplier under the threshold is not required to register though they may register voluntarily, and a supplier who is not a small supplier and makes taxable supplies in Canada must register [2]. A small provider crossing that line will start adding tax to your invoice mid-relationship, correctly, and often without a covering note. Sales tax on services for a Canadian answering service is worked through in GST and HST on an AI receptionist in Canada.

Reason four: one-time charges

Setup, a new number, moving numbers in from a previous provider, a handset, an after-hours site visit. These are legitimate, they belong to one month, and they should be labelled as one-time on the invoice. If they are not labelled, that is worth a question of its own, because a one-time charge that is not identified as one is indistinguishable from a new recurring fee for at least a month.

Reason five: the promotion ended

Introductory pricing that lapses after a fixed number of months is common and lawful, and it is also the single most frequent cause of the "my bill suddenly jumped" complaint. The test is whether you were told, in a way you could act on, what the figure becomes afterwards. When you compare providers, compare the post-promotion figure. That is your actual price; the introductory one is a discount on it.

Reason six: the price was never attainable

This is the one Canadian law names. Subsection 74.01(1.3) of the Competition Act treats the making of a representation of a price that is not attainable due to fixed obligatory charges or fees as a false or misleading representation, unless those charges are imposed under an Act of Parliament or of a provincial legislature [1].

Read the exception carefully, because it is the whole point. Sales tax is imposed under an Act, so a price shown before tax is not the problem being described. A mandatory charge the seller invented, an administration fee, a platform fee, a recovery fee, applied to every customer with no way to avoid it, is not covered by that exception. If a fee is unavoidable, it is part of the price.

The same section is worth knowing for the rest of the sales conversation: paragraph (1)(a) covers representations that are false or misleading in a material respect, and paragraph (1)(b) makes a performance claim reviewable where it is not based on an adequate and proper test, with the proof of that test resting on whoever made the claim [1]. That covers "you will never miss a call again" as squarely as it covers a price.

One practical note: an unavoidable fee does not become avoidable because it is disclosed in a footnote. If every customer pays it, put it in the headline figure and let buyers compare like for like. That is also simply easier to sell against, because the comparison a buyer runs in their head is between two total numbers, not between a number and a footnote.

What to ask, in one email

Send this before you sign anything, and keep the reply.

1. What is the all-in monthly figure for my actual number of extensions, with every mandatory charge included?
2. Which parts of the service are charged per use rather than per month?
3. What are the one-time charges, and what triggers each of them?
4. Is any part of this promotional, and what does the figure become afterwards?
5. What changes on the bill if I add or remove a person mid-cycle?

Five questions, one email, an answer you can hold up in month six. A wider list is in questions to ask a hosted phone provider, and the structural difference between billing models is in per-seat versus flat-band pricing. If the bill you are comparing came bundled with your internet, the hidden costs of a free carrier-bundled phone system is the relevant one.

Keep the record, it is deductible

While you have the invoices out: the Canada Revenue Agency lists telephone and utilities among deductible business expenses, stating you can deduct expenses for telephone, cellphone and utilities if you incurred them to earn income, with utilities related to a home workspace claimed as business-use-of-home expenses [4]. A clean set of monthly invoices for a business number is a documented figure. A personal mobile bill with business calls scattered through it is an argument. That is one more reason for a separate business number.

Where we sit

We run hosted phone systems for Canadian businesses and publish what they cost on the pricing page, including how extensions are counted, so the figure you work out yourself is the figure you get quoted. We would rather lose a deal on a number you can see than win one on a number you find out about in month two.

Sales tax is charged where it applies, because that is imposed under an Act rather than invented by us. Beyond that, there is no administration fee, no recovery fee and no platform fee, because a mandatory charge is just part of the price with extra steps. Reliable telephone service is treated in Canadian law as infrastructure, with section 7 of the Telecommunications Act affirming its essential role and setting out the objective of an orderly system throughout Canada [6]; the 1.08 million small businesses in this country [5] should be able to budget for it like a utility, not decode it like a puzzle.