Buy vs Build
Compare the total cost of ownership for building custom software vs buying SaaS.
Build (In-house)
Five Lakh Rupees
Fifteen Lakh Rupees
Three people
Two Lakh Rupees
Three Lakh Rupees
Five Lakh Rupees
Buy (SaaS)
Ten Lakh Rupees
Five Lakh Rupees
Two Lakh Rupees
One Lakh Rupees
Two Lakh Rupees
Five years
Summary & Recommendation
Total Build Cost
₹0
5 Year TCO
Total Buy Cost
₹0
5 Year TCO
Recommendation
You could save ₹0 by choosing to Buy.
Cost Projection (5 Years)
Detailed Yearly Breakdown
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Buy vs Build Deep Dive
The build estimate is always wrong — plan for it
Buy-vs-build compares a vendor's subscription against building the capability in-house — and the comparison fails when the build side is priced at its optimistic estimate. The honest build cost includes engineer time (fully loaded: salary + benefits + overhead, typically 1.3–1.5× base pay), an industry-standard overrun buffer (software projects routinely run 1.5–2× their estimates), and the piece almost everyone omits: perpetual maintenance at 15–25% of build cost per year — bug fixes, dependency upgrades, security patches, and the feature requests that arrive the day after launch. This calculator prices both paths over a multi-year horizon so the subscription's "forever cost" meets the build's "iceberg cost" on equal terms.
A worked example
A team needs internal analytics dashboards. Vendor: $24,000/year. Build: two engineers × 3 months ≈ $90,000 loaded cost, plus 20%/year maintenance (~$18,000). Three-year totals: vendor $72,000; build $90,000 + $54,000 = $144,000 — vendor wins by half. But stretch to six years with vendor price escalations of 10%/year and the gap narrows: vendor ≈ $185,000, build ≈ $198,000. Add a second use-case the vendor would bill separately and build pulls ahead. The crossover typically sits at 4–7 years — which is exactly why the horizon you choose, and your confidence in still needing this capability then, decides the answer.
The strategic questions that override the spreadsheet
Cost parity is not decision parity. Build when the capability is core differentiation — the thing customers pay you for — because owning it compounds advantages a vendor can't provide, and because vendor lock-in on your core is existential risk. Buy when the capability is undifferentiated plumbing (payroll, CRM, analytics, email): a vendor amortizes development across thousands of customers and will out-iterate any internal team at commodity features. The most expensive failure mode is the reverse of each: renting your differentiation, or hand-building your plumbing. Opportunity cost seals it — every engineer-month on internal tooling is a month not spent on product, and in a funded startup that month is priced in runway.
Common mistakes
- Comparing vendor price against engineer salaries alone — omitting overhead, overrun, and maintenance understates build cost by 2–3×.
- Ignoring integration and switching costs on the buy side — implementation, training, and data migration can add 30–100% to year-one vendor cost.
- Treating "we could build this in a weekend" as an estimate. The demo is a weekend; auth, permissions, edge cases, and reliability are the other 90%.
- Never revisiting. Vendor pricing, team capacity, and product priorities all drift; a buy decision at seed stage is legitimately a build decision at scale (and vice versa).
Related tools
The hire-vs-outsource calculator handles the people version of this same trade-off, the founder time value calculator prices whose hours the build would consume, the startup runway calculator shows what the build budget does to your survival window, and the decision delay calculator prices deferring the choice another quarter.
Follow these steps to get a clear Total Cost of Ownership (TCO) comparison:
- Enter 'Build' Costs: Estimate your in-house costs. Include one-time development efforts, average annual salaries for the team, team size, and annual costs for servers (infrastructure), bug fixes (maintenance), and major updates (upgrades).
- Enter 'Buy' Costs: Input the costs for a commercial solution. This includes annual license fees (e.g., ₹2,00,000/year for a SaaS), one-time setup/implementation fees, annual maintenance contracts (AMC), and one-time training or integration costs.
- Set Comparison Period: Choose the timeframe for comparison (e.g., 3-5 years). A longer period often shows the long-term benefits of building.
- Review TCO: The calculator shows the total cost for both options over the selected period. The recommendation will highlight the more cost-effective choice.
- Analyze the Chart: The line chart visualizes the cumulative costs. Look for the "crossover point"—the year where one option becomes cheaper than the other.
- Check Yearly Breakdown: The table provides a detailed annual cost comparison, helping you understand cash flow implications each year.
- Consider Non-Financials: Use the financial data as a baseline, then factor in strategic goals like speed-to-market, customization needs, and core business focus.
How This Calculator Works
Understanding the Total Cost of Ownership (TCO) Framework.
Educational Resources: Buy vs. Build
A strategic guide for Indian entrepreneurs.
Why This Decision Matters
The Buy vs. Build decision is one of the most critical strategic choices a startup can make. It directly impacts your financial runway, team focus, speed-to-market, and long-term scalability. Getting it wrong can lead to wasted resources and missed opportunities.
Key Factors to Consider
- Core Business Function: Is this feature a unique differentiator for your business? If yes, lean towards 'Build'. If it's a standard utility (like payroll), 'Buy'.
- Time to Market: How quickly do you need this solution? 'Buy' is almost always faster. Building can take months, delaying revenue generation.
- Customization Needs: How specific are your requirements? Off-the-shelf software may only meet 80% of your needs. If that last 20% is critical, you may need to 'Build'.
- Total Cost of Ownership (TCO): Look beyond the initial price. Include maintenance, upgrades, and support costs over 3-5 years.
- In-house Expertise: Do you have the engineering talent to not only build but also maintain and secure the software?
- Scalability: Will the solution grow with your business? A 'Buy' solution might have pricing tiers that become expensive at scale, making 'Build' cheaper in the long run.
India-Specific Considerations
- GST & Input Tax Credit (ITC): Buying software involves an 18% GST charge. While you can claim ITC, it impacts your short-term cash flow. Building avoids this on salaries but not on infrastructure.
- Compliance & Data Sovereignty: Regulations from RBI, SEBI, and IRDAI often require sensitive financial or personal data to be stored within India. Building provides full control over data residency.
- Vendor Reliability & Support: Evaluate the quality of local support and the vendor's long-term viability in the Indian market. A US-based vendor might offer poor support during Indian business hours.
- Statutory Employee Costs: When estimating build costs, remember to add Provident Fund (PF), ESI, and other statutory contributions, which add 20-30% to an employee's CTC.
The Decision Framework
Build If...
- It's your core competitive advantage.
- No off-the-shelf solution exists.
- You have strict data security/compliance needs.
- You have idle engineering capacity.
Buy If...
- It's a common business problem (CRM, HRMS).
- Speed to market is your top priority.
- You lack the required technical expertise.
- The TCO is clearly lower.
The Hybrid Approach
Start with a 'Buy' solution to validate the need and achieve speed. Once you have product-market fit and scale, use your learnings to 'Build' a custom solution that perfectly fits your workflow, migrating off the vendor platform.
Common Mistakes to Avoid
- Underestimating the true cost of maintenance for a built solution.
- Ignoring the opportunity cost of pulling engineers off the core product.
- Choosing to build for ego or the "Not Invented Here" syndrome.
- Forgetting to factor in non-monetary costs like vendor lock-in and integration complexity.
- Focusing only on the initial cost, not the TCO over several years.
- Failing to account for the "hidden factory" of internal support needed for a bought solution.
Frequently Asked Questions
Common questions and helpful answers about this calculator.