How to Budget for a Small Business Phone System

To budget for a small business phone system, start with the monthly price for your real headcount, including part-timers who need to answer, then add one-time costs (activation, hardware, texting registration), taxes and regulatory fees, and any usage-based extras like AI answering or international calls. The advertised per-user price is only the starting point; the total depends on how many people you add and what is billed on top.

This guide breaks the budget into its parts, shows how per-user pricing grows with the team, and gives you a worksheet.

The four parts of a phone budget

Part	Examples	Frequency
Subscription	Plan price per user or flat per account	Monthly or annual
One-time	Activation, desk phones, headsets, texting registration, setup time	Once
Usage	International calls, extra numbers, AI minutes, toll-free minutes	Monthly, variable
Taxes and fees	Federal and state taxes, USF recovery, 911 fees	Monthly, on top of everything

Part 1: The subscription

Count users honestly

Count everyone who needs to answer or place calls from the business number, not just full-time desk staff:

• Owners and managers
• Front desk and office staff
• Field techs or sales reps who take calls on their cells
• Part-timers and seasonal staff
• A bookkeeper who returns billing calls

Teams often budget for three seats, then discover they need six for real coverage.

Per-user list prices

Published month-to-month list prices for each vendor's lowest plan that includes calling and texting, checked on September 28, 2026:

Vendor and plan	Per user / month	3 users	5 users	10 users
Quo Starter	$19	$57	$95	$190
Nextiva Core	$23	$69	$115	$230
Ooma Office Pro	$24.95	$74.85	$124.75	$249.50
Dialpad Standard	$27	$81	$135	$270
RingCentral RingEX Core	$30	$90	$150	$300

Notes from the same check: Ooma's Essentials plan excludes texting, and Ooma charges a one-time $29.95 activation fee; RingCentral RingEX Core drops to $20 per user when billed annually; annual contracts lower some other vendors' prices. Prices exclude taxes and fees and change over time, so confirm on each vendor's pricing page.

Flat pricing

Some providers charge one price for the account regardless of users. The comparison is simple: divide the flat price by the per-user price to find the break-even headcount. Above that number, flat pricing wins, and it keeps winning as you add people. Others charge a base price that includes a set number of users, then a per-user rate above it; price those at today's headcount and next year's, because the comparison can flip as you grow.

Part 2: One-time costs

• Activation or setup fees. Some vendors charge one; check the fine print.
• Hardware. Cloud systems run in a browser or app, so desk phones are optional. A good headset for each person who takes many calls is usually the best hardware spend.
• Texting registration. US carriers require businesses texting from local numbers to register their brand and campaign through 10DLC, administered by The Campaign Registry. Providers pass through fees in different ways; ask whether it is one-time or monthly.
• Number porting. Free at some providers, charged at others.
• Setup time. Someone has to build ring groups, record greetings and set business hours. Budget a few hours.

Part 3: Usage-based extras

• International calling: usually billed per minute outside the US and Canada.
• Extra numbers: plans include a set number; more cost extra.
• Toll-free minutes: some providers bill inbound toll-free minutes separately.
• AI answering or receptionist minutes: often billed per minute or per call. Estimate from your after-hours and overflow volume.
• Answering service: if you use a live service for overflow, it is a separate bill.

Part 4: Taxes and regulatory fees

Advertised prices typically exclude taxes and fees. Common line items include federal and state taxes, 911 fees and Universal Service Fund (USF) recovery charges. The FCC sets the USF contribution factor each quarter; the factor announced for the fourth quarter of 2026 is 42.0%, a record high. Providers contribute to the USF on their interstate and international revenue and many recover the cost from customers, but how they calculate the line item varies, so ask for a sample bill for your location.

Details on these are in hidden fees on business phone bills.

A budget worksheet

Line	Your number
Users who need to answer or call
Price per user (or flat price)
Monthly subscription
Extra numbers
Estimated usage extras (AI minutes, international)
Estimated taxes and fees (from sample bill)
Monthly total
Activation and setup fees
Hardware (headsets, any desk phones)
Texting registration
One-time total
First-year total (monthly x 12 + one-time)

Run it for today's headcount and for next year's. If adding two seasonal staff changes your bill by hundreds of dollars a year, you want to know before you sign.

Compare cost with the cost of missed calls

A phone budget is not just a cost line. Compare the total against what missed calls cost you. Our cost of missed calls guide gives a formula using your own call log. A system that makes it affordable to add people to the ring group often pays for itself by lifting the answer rate.

Budgeting mistakes

• Budgeting only for desk staff, then paying for extra seats in month two.
• Ignoring annual lock-in. A cheaper annual rate is expensive if you switch in month four.
• Forgetting the switch itself. Porting, reprinting, setup time. See the switching providers checklist.
• Not asking for a sample bill. The fastest way to see the real total.

Budgeting with Callata

Callata Office is $99 a month with five users included and $20 a month for each additional user, so the subscription line is $99 for one to five users, $119 for six and $199 for ten. The first month is $79.99, then $99 a month. The plan includes up to three local numbers, unlimited inbound calling, a pooled allowance of 1,500 outbound US and Canada minutes per user each month (then $0.01 a minute), browser and cell calling, voicemail transcription, call recording with AI summaries, business hours routing and E911 on every number. Texting needs a one-time $49 carrier registration. Number porting is free. AI agents are optional and billed from prepaid AI minutes at $0.25 per minute, and you can bring your own ElevenLabs account.

Using the list prices above, Callata costs more than every listed plan for one to three users. At four users it costs less than Ooma, Dialpad and RingCentral, and from five users up it also costs less than Nextiva. Quo Starter stays slightly cheaper than Callata at every team size ($95 vs $99 at five users, $190 vs $199 at ten), and RingCentral billed annually at $20 per user is cheaper up to four users and $1 a month more than Callata from five users up. Start with Callata and budget $99 a month for up to five users.