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Thestartup due diligence is the process by which an investor or buyer verifies, with actual documentation, everything the founder has explained during the sales process or funding round. It is the moment when the narrative stops mattering and the numbers, contracts, and legal structure have to stand on their own. Preparing well for this process before the buyer or investor arrives, rather than during it, is one of the most profitable decisions a founder can make. And yet, it is also one of the most misunderstood.
What is due diligence and why does it determine the final price of a deal?
Due diligence is, in essence, a negotiated audit. It is not a test you pass or fail: it is a process in which both parties adjust expectations, assess risks, and decide if they want to work together, and on what terms. The buyer or investor enters the data room looking to confirm what they have been told; when they find inconsistencies, the reaction is not always to withdraw the offer, but to adjust the price, add warranties, establish escrows or condition the closing on future milestones. All of that, from the founder's perspective, represents value left on the table.
At Intelectium, we support startups through these processes, and what we consistently observe is that deals that get complicated rarely do so because of the problems themselves, but because of how those problems are handled when they come to light. An experienced investor expects to find gaps; what creates distrust is discovering them on their own, without the founder having mentioned them. That distrust has a direct and measurable cost on the final structure of the deal.
What does an investor discover during startup due diligence that doesn't appear in the pitch?
The first thing that usually appears is the gap between the metrics in the pitch deck and those reflected in the accounting. The Annual Recurring Revenue (ARR), or annual recurring revenue, is the most common example: many decks include pilots without signed contracts, one-off services that won't be repeated, or contracts that haven't started billing yet. This has a consequence that goes beyond the numerical difference: when the buyer recalculates the actual ARR, they also recalculate the multiple applied to that ARR. A twenty percent difference in recurring revenue can translate into a disproportionately larger drop in valuation if the buyer also concludes that the quality of that revenue is lower than what was presented. The mechanism is non-linear, and founders who don't understand this are often in for a surprise when the binding offer arrives.
The second thing that appears is deferred contingencies: collaborators who, in practice, have a disguised employment relationship, taxes settled using questionable criteria, commitments for phantom shares or bonuses that were never formalized, or conditions linked to public funding that haven't been met. None of these situations is necessarily fatal on its own. Together, and discovered by the buyer without the founder having mentioned them, they convey something worse than the problem itself: that no one was in control.
The third, and often the most decisive factor in M&A transactions, is the question of what is actually being bought. If the code was developed by freelancers without a signed intellectual property assignment, ownership of the product is questionable. If forty percent of revenue depends on two clients with change-of-control clauses, the buyer is acquiring a fragile position. And if all sales or product decisions go through the founder, the company has a key-person dependency risk that the investor will put a price onprocess.
How do you prepare a startup for due diligence before starting the process?
Preparation begins weeks or months before the first NDA arrives, not the day the investor requests access to the data room. At Intelectium, we recommend conducting an internal audit in four steps during the four to six weeks prior to the formal process.
- Complete financial reconciliation. Cross-reference all sources (bank, Stripe or other payment platforms, your accounting system, and your internal spreadsheets) and identify any inconsistencies. If the MRR shown in your pitch deck doesn't match the one from Stripe, you have a definition problem that the investor will spot before you do.
- Legal perimeter review. Founder agreements, updated shareholders' agreement, a clean cap table, contracts with your top three to five clients, agreements with key employees and collaborators, and the formal assignment of intellectual property. This part is technical and requires a specialized lawyer; it is not an expense, but an investment that prevents price renegotiations at the most inopportune moment.
- Simulated data room with external review. Set up the folder as if the process were real and ask an external advisor to review it with a critical eye. The goal is for someone without emotional involvement to point out the gaps before the buyer does.
- Metric stress test. Recalculate your CAC, LTV, churn, and ARR using different calculation criteria. If the numbers vary significantly depending on how you measure them, you have a definition problem that you must resolve beforehand, because the investor will explore it.
Is transparency about problems enough to save a deal?
There is an important nuance here that is lost in some simplified approaches circulating on the subject. It is often read that proactively disclosing problems is enough for the investor to accept them, as if transparency were a solution in itself. This is a half-truth that can lead a founder into a difficult position.
Transparency is a necessary condition, but it is not sufficient. There are contingencies that, even if communicated from day one, can indeed kill a deal or force a complete restructuring of the transaction. In the Spanish context, the most common examples are significant tax debt with the tax authorities, unpaid Social Security contributions over several fiscal years, or breaches of conditions linked to ENISA or CDTI loans that trigger a repayment obligation.process.
These situations are not resolved with an honest conversation; they need to be resolved before the process, not during it. My recommendation is clear: do not enter a due diligence process thinking that simply confessing your problems is enough. Before opening it, identify which items are negotiable and which are deal breakers real, and resolve the latter first.
Similarly, classifying workers as independent contractors when their relationship is materially that of an employee, accrual accounting criteria, or related-party transactions are areas where transparency opens the conversation but does not resolve the issue. These are precisely the areas where, at Intelectium, we most frequently see price renegotiations in Spanish startupsprocess.
How does due diligence vary depending on the type of transaction and investor?
A common mistake, with very practical consequences, is preparing for due diligence as if it were a homogeneous process. It is not. The scope, depth, and consequences vary significantly depending on the type of transaction and the investor's profile.
Suppose a startup is in simultaneous discussions with a venture capital fund with limited partners and with a family office. The former will demand structured representations & warranties , will review the shareholders' agreement in detail, and will likely request an independent legal due diligence; the latter may conduct a much more informal review focused on the business. Preparing the same data room for both processes is possible, but what each party prioritizes when reviewing it is not the same.
The same applies when the transaction is not an equity round but a partial or total sale, a debt transaction venture or a secondary transaction. In each case, the questions change, the relative weight of financial, legal, technical, and operational due diligence differs, and the timing of each block also varies. Financial, legal, and technical due diligence are rarely simultaneous or coordinated with each other in a real-world transaction, and a founder who doesn't understand the sequence can find themselves answering questions from the wrong block at the wrong time.
What role does public funding play in the due diligence of a Spanish startup?
Public funding (ENISA, CDTI, ICO lines, regional grants) is a common element on the balance sheets of Spanish startups. At Intelectium, we estimate that most late-stage startups have some form of public funding. This isn't a problem; it's the norm. The problem is failing to manage it well during due diligence.
Investors review conversion terms if they exist, the covenants , payment schedules, and, most importantly, whether the employment or activity maintenance conditions linked to each instrument have been met. A well-structured ENISA loan that is correctly disclosed from day one in the data room is an asset; that same loan with unmet conditions or contracts the founder cannot locate is a red flag that is disproportionate to the actual size of the problem.
Are you planning to open a funding round or transaction in the coming months?
With our outsourced CFO service, we prepare for due diligence with you from the inside, weeks before the first NDA arrives. We organize your metrics and accounting, coordinate the legal review, document your public funding, and build a data room that can stand up to investor scrutiny. We then stay by your side throughout the process to answer their questions with sound judgment. Talk to our CFO team
Frequently Asked Questions
How long does it take to prepare a startup for due diligence?
It depends on the current state of your records, but at Intelectium, we recommend setting aside four to six weeks for a serious internal audit before opening any formal process. Trying to compress that work while negotiating with an investor is the worst possible position: the founder ends up spending time reconstructing the past when they should be managing the future.
What documents are essential for a startup's data room?
At a minimum: financial statements for the last two or three closed fiscal years and the current year, updated shareholders' agreement, full capitalization table, contracts with key clients, agreements with employees and key collaborators, intellectual property documentation, and contracts for all public funding received, including their terms and conditions. If there are ongoing lawsuits or known contingencies, these must also be documented along with their risk assessment.
What is the difference between financial and legal due diligence?
Thefinancial due diligence verifies that the business's numbers are accurate and consistent: metrics, projections, accounting, and cash flow. legal due diligence reviews the legal structure: intellectual property, contracts, shareholders' agreement, labor obligations, and regulatory compliance. In a real-world transaction, both are conducted in parallel by different teams, and the findings of one inform the questions of the other.
Can a serious issue during due diligence kill the deal entirely?
Yes, although it depends on the type of issue. There are negotiable contingencies, such as delayed accounting, unsigned minor contracts, or metrics calculated using different criteria across tools. And there are others that, in practice, do kill the deal or force a complete restructuring: significant unresolved tax debt, breaches of public funding conditions with repayment obligations, or litigation regarding product ownership. The key is to identify which category each issue falls into well in advance and act accordingly.
Is it worth hiring external advisors to prepare for due diligence?
In my view, yes, and the argument is based on return on investment. A well-executed internal audit costs significantly less than a price renegotiation in the final stages of a transaction, or a deal that falls through due to a gap that could have been resolved earlier. Preventing a funding round from collapsing or being repriced downward due to a perfectly manageable issue more than justifies the cost of preparation.
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