Can a 5-user business just use mobile apps?

Yes, and many do — softphone-only removes the desk-phone line entirely (~$550 saved) at the cost of depending on headsets and personal phones. It works best for mobile, distributed teams and worst for a fixed front desk.

Is a separate business internet circuit needed?

Not usually at five seats: five G.711 calls use under 0.5 Mbps. What matters is a router that can prioritize voice and a connection that is not saturated by other traffic at peak times.

What is the cheapest legitimate 5-user setup?

An entry-tier seat (~$15 sample) with softphones and one shared desk phone can land near $100/month all-in — with entry-tier limits on queues and support. The budget above is the mid-tier, no-regrets version.

VoIP Costs

VoIP Budget for a 5-User Business: Worked Example

By the VoIP Cost Guide Editorial Team | Last updated: October 2026

Five users is where VoIP economics first surprise people: the per-seat price looks tiny, then the fee stack and the one-time hardware roughly double the first month. This worked budget itemizes a complete 5-user deployment using the illustrative model rates used across this site — a $25 mid-tier seat, $1 per extra DID, $1.25 per-line e911, and an 18% taxes-and-fees planning factor. Replace the sample rates with any live quote and the structure still holds.

At this size the decisions that matter are: keep the phone count lean, buy (don't rent) the handful of desk phones, and don't skip the small PoE switch that makes everything reliable.

Monthly budget (illustrative rates)

Line item	Math	Monthly
Seats (mid tier)	5 × $25	$125.00
DID numbers (5 user + 1 main spare)	6 × $1	$6.00
E911 service	6 × $1.25	$7.50
Taxes & fees (planning factor)	18% of $138.50	$24.93
Total monthly		≈ $163
Per user, all-in	$163 ÷ 5	≈ $33

One-time budget and the honest extras

One-time costs for five users: five entry/mid desk phones at a $110 sample price ($550), one 8-port gigabit PoE switch ($180), and cabling/miscellaneous ($120) — about $850 if you self-install using the provider's provisioning guides, which at this size is realistic for a technically comfortable owner. Add $300–$500 if you pay for professional installation and call-flow setup. What not to buy at five seats: a second internet circuit (nice, not essential), executive phones for everyone, and any hardware 'bundle' priced into a 36-month rental — five phones rent for more than they cost within about a year. The configuration choice that pays back immediately is the auto-attendant: a 5-person business where the owner answers every call loses more in interruptions than the phone bill costs.

Your 5-user buying sequence

Get two quotes and normalize them against the table above; reject any quote that will not itemize fees.
Buy phones outright (entry/mid tier, gigabit passthrough) and one PoE switch with wattage headroom.
Port your existing main number; take fresh DIDs for users. Keep the old service alive until the port completes.
Set up the auto-attendant and business-hours routing before go-live day, not after the first missed call.
Re-audit numbers and seats at month three; five-user systems accumulate spare DIDs surprisingly fast.

Frequently asked questions

Can a 5-user business just use mobile apps?: Yes, and many do — softphone-only removes the desk-phone line entirely (~$550 saved) at the cost of depending on headsets and personal phones. It works best for mobile, distributed teams and worst for a fixed front desk.
Is a separate business internet circuit needed?: Not usually at five seats: five G.711 calls use under 0.5 Mbps. What matters is a router that can prioritize voice and a connection that is not saturated by other traffic at peak times.
What is the cheapest legitimate 5-user setup?: An entry-tier seat (~$15 sample) with softphones and one shared desk phone can land near $100/month all-in — with entry-tier limits on queues and support. The budget above is the mid-tier, no-regrets version.

Sources and further reading

FCC: Understanding your telephone bill

Related guides

Disclaimer: This guide is educational information based on published VoIP standards and professional practice, not engineering advice for your specific system. VoIP pricing, taxes and fees change and vary by provider and location — verify current figures with providers before purchasing. If your phone system supports emergency calling, work with your provider or a qualified VoIP engineer for changes that affect E911.