For years, the conventional wisdom in IT leadership was straightforward: "never build internally, always buy an off-the-shelf SaaS". That advice made sense when custom software required on-premise data centers and large infrastructure teams. However, the modern business landscape has given rise to an uncomfortable reality: corporate SaaS subscription fatigue.
Growing companies quickly discover that subscribing to off-the-shelf tools for core operations creates an escalating, unpredictable monthly bill. As teams grow, per-user pricing turns into a literal toll on productivity. That makes the classic Build vs. Buy dilemma something that must be evaluated with cold, hard numbers.
The hidden costs of commercial SaaS
The value proposition of commercial software looks alluring on the pricing page: "starting at $40 per user per month". The financial reality after year one, however, often tells a different story:
- The growth tax (Seat Tax): most platforms charge per seat. When your company doubles in size, your software cost doubles automatically, even if the underlying infrastructure load barely changes. You are financially penalized for hiring.
- Exchange rate risks and unilateral price increases: top SaaS platforms price in USD or EUR. Companies face annual contract increases based on supplier policy, with zero negotiating leverage.
- Tier walls: you subscribe to the mid-tier plan, only to find you need one specific capability: an API integration with your ERP, centralized SSO/2FA, or custom reporting. To unlock that single feature, the vendor requires upgrading the entire team to the Enterprise tier, tripling your per-seat rate.
- Expensive customizations: when off-the-shelf software does not match your business model, you spend fortunes on implementation consultants to bend the tool, creating a fragile, expensive patchwork.
A real 36-month Total Cost of Ownership (TCO) simulation
To illustrate the math, let us compare cumulative costs over a 3-year (36-month) horizon for a business with 25 active users:
Scenario A: Commercial SaaS Platform
- Average subscription: $50 per user/month for 25 users = $1,250/month.
- Setup and implementation consulting: $3,500.
- Year 1 Cost: $18,500.
- Year 2 Cost: expansion to 30 users plus standard 10% license increase = $19,800.
- Year 3 Cost: maintaining 30 users with standard pricing = $21,780.
- Total 3-year cumulative spend: roughly $60,080 paid in service invoices.
- Equity built at the end of 3 years: $0. If you cancel, access ends immediately.
Scenario B: Custom Proprietary Software
- Full MVP development: $14,000 (delivered in agile 6 to 8-week sprints).
- Modern serverless hosting & managed database: $75/month = $2,700 over 3 years.
- Budgeted maintenance and evolutionary upgrades: $200/month average = $7,200 over 3 years.
- Total 3-year cumulative spend: approximately $23,900.
- Equity built at the end of 3 years: 100% of the codebase and intellectual property belong to your business, adding directly to enterprise valuation.
The financial break-even between custom software and off-the-shelf SaaS typically occurs between months 12 and 16. From that point on, accumulated monthly savings remain directly in your company cash reserves.
When is off-the-shelf SaaS still the right choice?
Building custom software does not mean reinventing the wheel for everything. Off-the-shelf SaaS remains the smart economic choice for commoditized utilities:
- Corporate email and team chat (Google Workspace, Slack);
- Standard accounting and payroll;
- Payment gateways and tax compliance processors.
On the other hand, when a workflow represents your core value proposition: how you price, handle logistics, serve customers, or synthesize strategic data, renting generic software weakens your competitive differentiation and drains financial resources.
How to make this decision responsibly
Building proprietary software does not need to be a risky gamble. The key is partnering with a technical team that prioritizes lean deliverables, modern low-maintenance architectures, and a clear focus on return on investment.
At Salto Solutions, we calculate the financial viability of your project before any development commitment. Schedule a conversation to evaluate your TCO together and map the most profitable route for your business.