When comparing a hosted phone system with a traditional on-premise PBX, the monthly fee only tells part of the story. As a finance person, I always look at the total cost of ownership (TCO) - everything you spend over the life of the system. Done properly, that comparison is usually decisive.
What goes into TCO?
TCO captures all costs across the system's lifetime, not just the sticker price:
- Upfront / capital costs - hardware, installation, setup.
- Ongoing / operational costs - line rental, call charges, support, maintenance.
- Hidden costs - changes, upgrades, repairs, and the cost of downtime.
On-premise PBX: the cost profile
A traditional PBX is a capital purchase. You pay a large sum upfront for:
- The PBX hardware itself
- Installation and configuration
- Phone handsets
- ISDN/PSTN line rental (ongoing)
Then the costs keep coming: maintenance contracts, engineer call-outs for every change (a new starter, a moved desk), and eventually a costly replacement when the hardware ages out or - as is happening now - the underlying network is switched off.
Hosted telephony: the cost profile
Hosted telephony is an operational expense. There's little to no upfront hardware cost, and you pay a predictable per-user monthly fee that includes maintenance, upgrades and features. Changes are made yourself in a web portal at no cost.
A simple TCO comparison
| On-premise PBX | Hosted telephony | |
|---|---|---|
| Upfront cost | High | Low / none |
| Line rental | Yes | No |
| Maintenance | Paid contract | Included |
| Changes & moves | Engineer fees | Free, self-service |
| Upgrades | Buy new hardware | Automatic |
| Replacement cycle | Every several years | None |
Don't forget the cost of downtime
On-premise hardware is a single point of failure - if the box dies, your phones die with it, and you wait for an engineer. Hosted systems reroute calls automatically during an outage, protecting you from the downtime costs that rarely make it into a spreadsheet but hit hard in real life.
The bottom line
Once you account for upfront hardware, ongoing maintenance, change fees and downtime, hosted telephony almost always wins on total cost of ownership - while turning a lumpy capital risk into a smooth, predictable monthly cost. Want a TCO comparison for your business? Request a callback and we'll run the numbers, or explore our Cloud Telephony service.
Frequently asked questions
Is hosted or on-premise PBX cheaper overall?
When you include hardware, maintenance, upgrades, power and support, hosted PBX usually has a lower total cost of ownership for most small and medium businesses.
What ongoing costs does an on-premise PBX have?
On-premise systems carry maintenance, support contracts, upgrades, power and eventual replacement costs, on top of the large upfront purchase.
Do I still own anything with hosted PBX?
With hosted PBX you subscribe to a service rather than owning hardware, which removes maintenance worries and keeps you on the latest features automatically.
