Short answer: private AI for a small business costs a one-time setup of $5,000 to $15,000, which includes hardware you own, plus a flat monthly fee of $500 to $2,500 for support and updates. Over three years, a 20-person firm pays $46,000 to own its AI. Renting the equivalent subscriptions costs $25,200 to $39,600 at today's prices. Owning costs more in cash at that size. The rest of this post is the math, and what the difference buys.
By Jacques M. Jean. First published May 2026, updated October 2026.
If you run a 20-person professional services firm, your AI stack is probably costing you between $400 and $1,200 a month right now. You may not know it, because nobody centralized the bill. The subscriptions are scattered across personal credit cards, the firm card, and a half-dozen vendors.
This is what most owners I talk to discover in the first 15 minutes of a discovery call. They are renting AI from four to six vendors and paying more than they thought.
Here is the honest math on what that costs over three years, and what owning your AI costs over the same window.
What does a small firm really spend on AI subscriptions?
A 20-person firm typically spends $700 to $1,100 a month once every subscription is counted. Here is one inventory, from a 22-person regional accounting practice:
| Tool | Seats | Monthly | Annual |
|---|---|---|---|
| Microsoft 365 Copilot | 8 | $240 | $2,880 |
| ChatGPT Plus (firm card) | 5 | $100 | $1,200 |
| ChatGPT Plus (personal, expensed) | 3 | $60 | $720 |
| Claude Pro | 2 | $40 | $480 |
| Notion AI | (firm-wide) | $80 | $960 |
| GitHub Copilot (one developer) | 1 | $20 | $240 |
| Grammarly Premium AI | 4 | $48 | $576 |
| Jasper (marketing intern's idea) | 1 | $49 | $588 |
| Otter.ai (Pro Lite, for meetings) | (shared) | $30 | $360 |
| Total | $667 | $8,004 |
That is the floor. It leaves out the tools that bundle AI features into a subscription you already pay for: the CRM, the accounting package, the practice management software. Add those and the range for a firm this size is $700 to $1,100 a month.
Do AI subscription prices go up?
The entry plans have held steady. ChatGPT Plus has cost $20 a month since it launched in February 2023. Microsoft 365 Copilot is $30 a seat.
The bill grows anyway, for two reasons. First, the count grows. Every new hire is another seat, and every new tool is another line. Second, the best features move to higher tiers that cost $100 to $200 a month per person.
So I will not promise you a price hike. I will use today's prices and hold them flat. If the math works at flat prices, it works.
Is owning AI cheaper than renting it over three years?
Not at 20 people. Owning costs $46,000 over three years. Renting costs $25,200 to $39,600 at flat prices.
| Rent (public AI subscriptions, 20 people) | Own (TechFides Sovereign M) | |
|---|---|---|
| Year 1 | $8,400 to $13,200 | $10,000 setup plus $12,000 = $22,000 |
| Year 2 | $8,400 to $13,200 | $12,000 |
| Year 3 | $8,400 to $13,200 | $12,000 |
| Three-year total | $25,200 to $39,600 | $46,000 |
| What you hold at the end | Nothing | The hardware, the CRM, the system |
| Per-user charges | Yes | None |
| Where your data lives | The vendor's servers | Your building |
What does owning cost, line by line?
A Sovereign M build for a 20-person firm costs $10,000 once and $1,000 a month.
| Line item | Cost |
|---|---|
| Setup, hardware and build (Sovereign M) | $10,000 one-time |
| Open-source model license (Llama, Mistral) | $0 |
| Monthly (Sovereign M) | $1,000/mo |
| Support, changes and model updates | Included |
| 3-year total | $46,000 |
Owning costs $6,400 to $20,800 more than renting over three years at this size. Here is what that difference buys.
The rent stack gives you scattered access to consumer AI tools through nine or more vendors. Every tool has its own privacy policy, its own data flow and its own cancellation terms. You have no central audit trail. Half of it sits on personal accounts.
The own stack gives you one system, on hardware you control, with one partner. Your data does not leave the building. Your team uses it without counting prompts. When a client or auditor asks where their data goes, the answer is one sentence long.
It also replaces other bills. Every Sovereign plan includes the CRM, with no per-user license. If you pay for a CRM today, put that number on the rent side.
Where is the break-even?
On subscriptions alone, owning and renting meet at about 23 to 37 people. That is $46,000 over three years divided by $35 to $55 per person per month. Add a person after that and renting costs more. Owning stays flat.
Three things move the break-even earlier:
1. Regulated data. A privacy complaint, a bar inquiry or a client who asks "where did my file go" each has a price. Renting carries that exposure every day.
2. Flat cost changes behavior. When your people know that using the AI does not raise the bill, they use it for everything it is good at. When each seat is rationed, they do not.
3. The asset is yours. The hardware, the configuration and the workflows stay with you. With rent, everything stops the day you stop paying.
Who should keep renting?
Not every firm should own.
Rent makes sense if:
- You are under 10 people and your AI use is light
- Your data is not sensitive
- You cannot justify a fixed monthly cost above a few hundred dollars today
Own makes sense if:
- You are 10 or more people and AI is becoming central to daily work
- You handle regulated data: healthcare, legal, financial, government
- Your clients ask where their data goes
- You want a clear answer to "what is your AI policy?"
- You want a bill that does not move when you hire
Most of the firms we talk to fit the second profile. That is why we built TechFides Private AI: for firms that need to own their AI and do not have an IT department to make it happen.
How do I run the numbers for my firm?
Use the ROI calculator. Enter your headcount and your current subscription spend, and it shows the three-year comparison for your team.
If you want a faster read first, take the 2 minute AI Ownership Test. No signup and no sales call attached.
Most owners are surprised by the result. Owning is not always cheap. The surprise is how large the rent number is once someone adds it up for the first time.
The questions people actually ask
How much does private AI cost for a small business?
TechFides plans start at $5,000 setup and $500 a month for offices of up to 5 people, $10,000 and $1,000 for a full team at one site, and $15,000 and up with $2,500 a month for multiple sites. The setup includes hardware you own. There are no usage meters or per-user fees.
Is owning AI cheaper than renting it?
Not for a 20-person firm on price alone. Owning costs $46,000 over three years on Sovereign M. Renting the usual mix of subscriptions costs $25,200 to $39,600 at today's prices. The two meet at about 23 to 37 people. Owning wins sooner when the data is sensitive or the AI replaces a real cost like a missed call.
What does the monthly fee pay for?
Support, changes, fixes and model updates from people who know your system. It is not a license. For the AI back office, that monthly is part of the plan, because a working back office is shaped around your team over months.
Do subscription AI prices go up?
The entry plans have held steady. ChatGPT Plus has been $20 a month since it launched in February 2023. What grows is the count: more seats, more tools, and newer tiers that cost $100 to $200 a month. Check each vendor's pricing page, because plans change.
Can I see the math for my own team?
Yes. The ROI calculator takes your headcount and your current subscription spend and shows the three-year comparison. If the CRM is the bill that bothers you most, start with Own your CRM.
Own your AI. Pay for it once, run it on hardware that is yours, and keep a bill that stays flat when you grow.
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