The Total Investment Framework
Before you can calculate return, you need an honest accounting of investment. Most executives undercount their total investment by ignoring opportunity costs and ongoing expenses. The total investment in an executive side project includes four components: direct development costs (the build itself), operational costs for the first 12 months (hosting, tools, support), marketing and customer acquisition costs, and the executive's time valued at their effective hourly rate.
Direct development costs for an MVP typically range from $30K to $80K depending on complexity. Operational costs for a lean SaaS product run $500 to $2,000 per month. Marketing costs vary widely but budget $5K to $15K for the first year of a bootstrapped product. And your time—assuming five hours per week at an executive hourly rate of $200 to $500—adds $50K to $130K in annualized opportunity cost.
Adding it all up, the total first-year investment in an executive side project ranges from $100K to $250K when you include opportunity costs. This sounds significant, but context matters. Compared to the cost of hiring a single senior engineer ($200K+), the cost of a failed corporate innovation initiative ($500K+), or the cost of a traditional startup with full-time founders ($500K in the first year), an executive side project is a capital-efficient bet.
The Revenue Projection Model
Conservative revenue projections for B2B SaaS side projects follow a predictable curve. Month one: 3 to 5 paying customers from your pilot group. Month three: 10 to 20 customers through network referrals and targeted outreach. Month six: 30 to 50 customers as organic growth and basic marketing take effect. Month twelve: 75 to 150 customers if the product has achieved genuine product-market fit.
At an average contract value of $200 per month—a reasonable midpoint for B2B tools targeting mid-market companies—these customer counts translate to monthly recurring revenue of $600 to $1,000 in month one, $2,000 to $4,000 in month three, $6,000 to $10,000 in month six, and $15,000 to $30,000 in month twelve. Annual recurring revenue at the 12-month mark: $180K to $360K.
These projections assume a product that solves a real problem for a defined market—which is why the validation phase matters so much. If you skip validation and build the wrong product, these curves flatten dramatically. If you validate well and launch into a hungry market, they can steepen considerably. The MVP Sprint process includes market sizing and pricing validation as part of the scoping phase, ensuring your revenue projections are grounded in real market data rather than wishful thinking.
The Enterprise Value Multiplier
For executives accustomed to thinking about enterprise value, the ROI calculation for a SaaS side project is particularly attractive. Private SaaS companies with $100K or more in ARR typically sell at five to ten times annual revenue, depending on growth rate, retention metrics, and market dynamics. A side project that reaches $200K ARR in its first year represents a potential asset value of $1M to $2M.
This multiplier effect transforms the ROI equation. Even if the direct cash-on-cash return in year one is negative—which it often is for growing SaaS businesses that reinvest revenue into customer acquisition—the enterprise value creation can be substantial. A side project that cost $150K in total investment (including opportunity costs) and generates $200K ARR in year one has created $1M to $2M in enterprise value. That is a 7x to 13x return on invested capital.
The enterprise value perspective also influences strategic decisions. Every dollar you invest in reducing churn, improving net revenue retention, and accelerating growth rate increases the valuation multiple. A side project growing at 15% month-over-month with 95% net revenue retention commands a significantly higher multiple than one growing at 5% with 85% retention. Understanding these dynamics helps you allocate your limited time and budget toward the activities that create the most value.
Building Your Side Project Business Case
Every executive side project should have a one-page business case that captures the investment thesis. This is not a 40-page business plan—it is a concise document that answers five questions. What is the problem and who has it? What is the total addressable market and your realistic serviceable market? What is the total investment required across the first 12 months? What are the conservative, moderate, and aggressive revenue projections? What is the expected enterprise value at the 24-month mark under each scenario?
The business case serves two purposes. First, it forces disciplined thinking about the opportunity before you commit capital. If you cannot articulate the investment thesis on one page, the opportunity is either too vague or too complex for a side project structure. Second, it provides a benchmark for ongoing evaluation. At month three, month six, and month twelve, compare actual performance to your projections. If you are tracking the conservative case, stay the course. If you are underperforming even the conservative case, diagnose the root cause and adjust.
If you need help building your business case, the strategic scoping process at Sizzle Ventures includes market analysis, competitive positioning, and financial modeling as part of the pre-build engagement. This ensures your investment decision is based on rigorous analysis rather than entrepreneurial optimism.
Ready to Build Your Side Project?
Executives across every industry are turning side project ideas into real products—without pulling a single engineer off their core team. The key is working with a partner who understands both the technical execution and the strategic context of building alongside a day job.
Sizzle Ventures helps executives go from idea to launched product in as little as 90 days. Our MVP Sprint is built specifically for leaders who need speed without sacrificing quality—and without touching their internal dev team.
Ready to explore what's possible? Start a conversation with Sizzle about bringing your side project to life.