The 5-Year Math on SaaS vs. Custom Software

Your SaaS stack is more expensive than you think

Here is a scenario I see all the time. A company with 20 employees is running their business on a handful of SaaS tools. A CRM at $150/seat/month. A project management platform at $30/seat/month. An industry-specific operations tool at $200/seat/month. Maybe a reporting dashboard on top of that at $50/seat/month.

That is $430 per person, per month. For 20 people, you are looking at $8,600/month. $103,200 per year.

Not cheap, but manageable. The tools work. Your team knows them. Nobody is thinking about alternatives.

Then year two hits, and your CRM sends you an email about a "pricing update." Your project management tool adds AI features you did not ask for and raises rates to cover them. The operations platform bumps you into a new tier because you added three employees.

This is not a hypothetical. SaaS prices are rising at 12.2% annually according to the Vertice SaaS Inflation Index. That is 4.5 times faster than general inflation. Salesforce raised prices 9% in 2023 and another 6% in 2025. HubSpot's 12% hike sparked a viral backlash with 50,000+ comments on LinkedIn. Slack's business plan went up 20% in a single jump.

And these are the companies that tell you about the increase. Plenty just quietly adjust your renewal.

The 5-year math

Let's run the actual numbers on that $103,200/year SaaS stack. We will use the industry average of 10% annual price increases and assume the team grows from 20 to 30 people over five years.

Year 1: 20 seats, $430/seat/month = $103,200

Year 2: 22 seats, $473/seat/month (10% increase) = $124,872

Year 3: 25 seats, $520/seat/month = $156,000

Year 4: 28 seats, $572/seat/month = $192,192

Year 5: 30 seats, $629/seat/month = $226,440

5-year SaaS total: $802,704

That is over $800,000 and you own nothing. Cancel the subscriptions and you are left with whatever data you can export, if you can export it at all.

Now compare that to a custom solution that replaces the CRM, operations tool, and reporting dashboard (we will keep the project management platform because that is a commodity tool where SaaS makes sense).

Custom build: $180,000 upfront for discovery, development, and deployment

Annual maintenance and hosting: $48,000/year ($4,000/month)

Year 1 total: $228,000

Years 2-5 maintenance: $192,000

5-year custom total: $420,000

The custom path costs roughly half. And the gap only widens after year five because the SaaS costs keep compounding while maintenance stays flat.

The costs nobody puts in the spreadsheet

The subscription fee is just the starting number. Here is what else you are paying for with a SaaS stack.

Integration duct tape. Your CRM does not talk to your operations tool. So someone built a Zapier workflow, or worse, someone manually copies data between systems twice a day. That integration layer is fragile, and every time one vendor updates their API, something breaks.

Training on someone else's product decisions. When your SaaS vendor redesigns their interface (and they will, usually right when you are busiest), your team has to relearn workflows they already had down. You have zero input on these changes.

Workaround labor. The tool does 80% of what you need, so your team spends hours every week handling the other 20% manually. We wrote about this in detail in The Hidden Cost of "Good Enough" Software. Those workarounds add up to thousands of hours per year across a team.

Data hostage situations. Your business data lives on someone else's servers, in someone else's format. Try migrating five years of customer records out of a CRM that really does not want you to leave. Some vendors make it deliberately painful.

Feature bloat you fund but never use. SaaS companies build for everyone, which means you are subsidizing features designed for industries and use cases that have nothing to do with yours. That AI assistant they added to justify the price hike? Nobody on your team has opened it once.

When custom software makes sense

Custom is not always the right call. It is not even usually the right call. But there are specific situations where the math tips hard in its favor.

You have more than 15 people using the tool. Per-seat pricing is a multiplier. The more seats, the faster the SaaS cost compounds, and the better custom ROI looks.

The tool touches your core operations. If it is where your team lives every day, it should work exactly the way your business works. Not the way some product manager in San Francisco thinks your industry works.

You are paying for 3+ tools that should be one system. If your team bounces between a CRM, a scheduling tool, and a reporting dashboard to complete a single workflow, you do not have three tools. You have one broken tool sold in three pieces. This is one of the signs your business has outgrown spreadsheets and patchwork tools.

Your SaaS vendor keeps raising prices. If you have absorbed two or three price increases already, do the projection. Where does that line go in three more years?

When SaaS is the right choice

I build custom software for a living, and I will be the first to tell you that plenty of businesses should stick with SaaS.

Your team is small. Under 10 people, per-seat pricing usually wins because the monthly cost does not justify the upfront investment.

The tool is a commodity. Email, video conferencing, project management, file storage. These are solved problems. Nobody needs a custom Slack. Just pay for the tool and move on.

Your processes are still changing. If you are a young company still figuring out how you operate, locking yourself into custom software too early means you will be rebuilding it in 18 months. Use SaaS to experiment, then build custom once you know what your workflow actually needs to be.

You need something tomorrow. Custom takes 3-6 months to build right. If you need a solution this week, SaaS is the answer. Just make sure "temporary" does not quietly become "permanent."

The real question to ask

Stop asking "should we build or buy?" That framing makes it sound like a one-time decision. The better question is: what does our software cost us over the next five years, and what do we get to keep at the end?

If the answer is "we spend $800,000 and own nothing," it is time to run different numbers.

If you want to see what a custom solution would actually cost for your specific situation, reach out and we will do the math together. No pitch, just the numbers. Or if you want to understand what custom software development looks like from start to finish, check out our custom software page.