Buying a SaaS business sounds clean. Recurring revenue. Low overhead. No inventory. Then you get into the code, and the deal either holds together or falls apart.

A SaaS code review acquisition is one of the highest-leverage due diligence steps a buyer can take. It is also one of the most misunderstood. Most first-time buyers either skip it entirely or treat it like a checkbox. Neither works.

Here is what actually happens when you dig into the codebase of a software business you are trying to acquire, and why the findings should change how you think about price, structure, and whether to close at all.

What a SaaS Code Review Acquisition Actually Involves

A SaaS code review during an acquisition is the process of evaluating the target company’s software codebase, architecture, and technical infrastructure to surface risks, hidden liabilities, and the true cost of maintaining or scaling the product after you take over.

This is not a financial audit and it is not an operational review. It covers the things that never show up on a P&L: technical debt, security vulnerabilities, dependency risks, scalability constraints, and whether the product can survive without the person who built it.

The review typically happens during due diligence, after you have signed a letter of intent but before you commit to a final purchase price. What you find can and should affect your valuation, your negotiating position, and in some cases, your decision to walk away entirely.

Why This Step Gets Skipped (And Why That Is a Mistake)

Most SaaS acquisitions in the $500K to $5M range involve buyers who are not software engineers. They see recurring revenue, low churn, and a clean dashboard and assume the product is solid.

That is a reasonable starting point. It is a dangerous ending point.

We have seen deals where a business was generating $40K in monthly recurring revenue on a codebase built by a freelancer four years ago with no documentation, no test coverage, and a deprecated framework that the core hosting provider was sunsetting within 18 months. The business looked great on paper. The product was a six-figure liability.

And here is the thing that catches most buyers off guard: SBA lenders will not catch this for you. Their underwriting focuses on cash flow, DSCR, and borrower creditworthiness. Nobody at the bank is opening the GitHub repository. Nobody is reading the deployment scripts. The risk lands entirely on you.

What the Code Review Should Actually Cover

A thorough technical review of a SaaS acquisition target covers five areas. Some of these will matter more than others depending on the product, but all five need at least a baseline assessment.

Architecture and scalability. How is the product built? Is it a monolith or microservices? Does it run on shared hosting or cloud infrastructure that can scale with demand? A product doing $50K MRR on an architecture that breaks at $200K MRR is not worth the same multiple as one that scales without a rebuild. Not even close.

Technical debt. Every codebase has technical debt. That is not the issue. The issue is whether the debt is manageable or structural. Manageable debt means you can chip away at it over time while still shipping features. Structural debt means the product needs to be substantially rewritten before it can grow, and that rewrite cost belongs in your acquisition math, not in some vague post-close improvement plan.

Security posture. SaaS businesses handle customer data. If the codebase has known vulnerabilities, weak authentication, or poor data handling practices, you are acquiring potential liability that could surface the week after you close. For SBA lenders, a data breach post-acquisition that triggers customer loss directly affects your ability to service the loan. Worth noting: even if the lender does not ask about security posture (most will not), you should care about it anyway.

Dependency risks. Most software products rely on third-party libraries, APIs, and services. If a critical dependency is abandoned, deprecated, or controlled by a single vendor with pricing power over you, that is a risk worth quantifying before you sign. We have watched deals where a single API provider accounted for 30% of the product’s core functionality, and that provider had no long-term contract in place. That is not a feature. That is a liability sitting in plain sight.

Bus factor. How many people need to disappear before the product stops working? If the answer is one, and that person is the seller, you have a serious transition risk. Undocumented code with no internal knowledge transfer plan is a problem that gets more expensive every week after close.

So that covers the technical side. The financial implications are a different conversation, and that is where most buyers really need to pay attention.

How Code Review Findings Affect Your Valuation

This is where it matters for your wallet.

Say you are looking at a SaaS business listed at $1.5M, which the broker is presenting as roughly 4x annual SDE. The seller claims $375K in owner earnings. You run your SBA debt service model, and the DSCR clears at 1.65x. On the surface, the deal looks workable.

But here is where you need to slow down. That $375K SDE number is the seller’s number, built with the seller’s add-backs. In our experience, the real owner cash flow on SaaS deals (after you strip out aggressive add-backs, account for actual development costs the business needs to keep running, and normalize for owner-specific expenses) lands 15% to 50% below whatever SDE figure the broker is quoting. If the true cash flow is closer to $260K, your effective DSCR just dropped to a range that makes the deal much tighter.

Then the technical review comes back with $200K in estimated remediation costs to address critical technical debt before the product can handle the customer growth trajectory the seller used to justify the multiple.

That $200K is not baked into the acquisition price. It is a post-close capital requirement. Your real cost of ownership went up, and your effective DSCR dropped again once you factor in that capital outlay.

The right move is to go back to the seller with the findings and renegotiate. Either the price comes down by the remediation estimate, the seller agrees to fix the issues before close, or you walk. Three options.

INTERNAL LINK: how to negotiate SBA acquisition price adjustments

Sellers who built a SaaS product over several years often have significant emotional attachment to the asking price. Technical findings give you an objective, documented basis for a price adjustment that is hard to argue with when it comes from a qualified third-party engineering reviewer. Meet the seller on price if you need to, but win on the terms and structure. That is where the real economics of the deal live.

Who Should Run the Technical Due Diligence

Two realistic options: hire a fractional CTO or a dedicated technical due diligence firm.

A fractional CTO with SaaS acquisition experience is often the better fit for deals in the $500K to $3M range. They understand product strategy, not just code quality. They can translate technical findings into business implications (what it means for revenue, churn, and growth) rather than handing you a list of bugs and leaving you to figure out what it means.

A dedicated technical due diligence firm makes more sense on larger deals or when the product complexity is high. Multi-tenant enterprise SaaS, complex integrations, regulated data environments. That kind of thing.

Expect to spend between $5,000 and $15,000 for a serious review. For a $1M acquisition, that is 1% to 1.5% of deal value. One of the better uses of pre-close capital in any SaaS deal.

Do not rely on the seller’s technical summary or a five-minute demo. And do not rely on a developer friend who owes you a favor. This needs to be someone who can produce a written assessment you can bring to the negotiating table and, if needed, present to your SBA lender as part of the deal package.

How SBA Lenders View SaaS Acquisitions

SBA 7(a) financing is available for SaaS acquisitions. Lenders have gotten more comfortable with software businesses over the past several years, particularly those with predictable recurring revenue and low customer concentration.

But SaaS deals carry specific underwriting considerations that brick-and-mortar acquisitions do not.

Lenders look hard at revenue quality. Monthly recurring revenue that is contractually locked in reads better than month-to-month subscriptions where customers can cancel with 30 days notice. Churn rates matter. A business losing 3% of its customer base per month has a fundamentally different risk profile than one losing 3% per year.

They will also scrutinize add-backs more carefully on SaaS deals. If the seller is adding back a substantial portion of their development costs as discretionary, the lender will want to understand what happens to the product if those costs are not replaced post-close. This is where your technical due diligence ties directly into the financing conversation.

INTERNAL LINK: how SBA lenders evaluate add-backs

On the financing structure, standard SBA 7(a) mechanics apply. Minimum 10% equity injection. Loan terms up to 10 years. Seller note on full standby at 0% interest during the SBA loan term (we get this on roughly 90% of our deals, and it is not a last resort, it is the standard we hold). We target a 2x DSCR on SaaS deals and will accept as low as 1.5x when the synergy case is strong and well-documented. Below 1.5x, the deal needs to be restructured or you need to walk. A 1.25x DSCR is dangerous territory regardless of how good the revenue looks.

The technical due diligence findings feed directly into the lender’s risk assessment. A clean technical review supports your case for financing. A review that surfaces major issues needs to be addressed before you take the deal to a bank, because a lender who sees unresolved technical risk will either decline the deal or price it accordingly.

When the Code Review Surfaces Major Issues

A bad technical review does not automatically kill a deal. It changes the deal.

First question: are the issues fixable at a known cost? Technical debt with a clear remediation roadmap and a reliable cost estimate is a negotiating tool. You know what you are working with. Technical debt with no clear path forward, or issues embedded in the part of the product that generates core revenue, is a different animal entirely.

If the seller is motivated and the business fundamentals are strong, you have real options:

  • Price reduction tied to the remediation estimate. Most straightforward.
  • Seller holdback or escrow to cover identified issues post-close.
  • Earnout structure where a portion of the purchase price is contingent on product stability metrics after closing. Though SBA guidelines constrain how earnouts interact with the loan structure, so your attorney needs to be involved early.

Your attorney should review any deal structure adjustment that results from technical findings. The asset purchase agreement needs to address who owns the remediation risk after close. This is not the place for a handshake agreement or a vague promise that “we will work it out.” Get it in writing. All of it.

Frequently Asked Questions

What is a SaaS code review acquisition?

A SaaS code review acquisition refers to evaluating a software company’s codebase, technical infrastructure, and architecture during the acquisition due diligence phase. The goal is to identify technical debt, security risks, dependency vulnerabilities, and scalability constraints before finalizing a purchase price and closing the deal. Think of it as the technical equivalent of proof of cash on the financial side.

Can you get SBA financing to acquire a SaaS business?

Yes. SBA 7(a) loans are available for SaaS business acquisitions. Lenders evaluate recurring revenue quality, churn rates, customer concentration, and the borrower’s ability to service debt at a minimum 1.25x DSCR (though we target 2x and consider 1.5x the real floor). Standard terms apply: minimum 10% equity injection, up to $5M in financing, and loan terms up to 10 years.

How much does technical due diligence cost for a SaaS acquisition?

A thorough technical review from a qualified fractional CTO or technical due diligence firm typically costs between $5,000 and $15,000 for deals in the $500K to $3M range. Cost scales with codebase complexity. For most SaaS acquisitions, this is one of the best pre-close investments a buyer can make, often paying for itself many times over in price negotiation leverage.

What happens if the code review finds serious problems?

Technical findings give you documented grounds to renegotiate the purchase price, request a seller holdback, or require the seller to remediate issues before close. In cases where issues are structural and remediation costs are unclear, walking away may be the right call. The findings should also be shared with your SBA lender if they materially affect the business’s revenue-generating capacity.

How long does a SaaS code review take during due diligence?

A thorough technical review takes 2 to 4 weeks for most SaaS businesses in the sub-$5M acquisition range. Complex products, multi-tenant architectures, or businesses with large legacy codebases can take longer. Plan for it in your LOI-to-close timeline. Most SBA deal timelines run 60 to 90 days from signed LOI, and technical diligence should begin in the first two weeks.

Thinking About Acquiring a SaaS Business?

Regalis Capital works with buyers acquiring software and SaaS businesses using SBA 7(a) financing. We run the deal from sourcing through close, including coordinating technical due diligence, structuring the seller note on full standby, and managing the SBA process so you have a team that has done this before standing next to you.

If you are serious about acquiring a SaaS business and want a team that reviews 120 to 150 deals per week to find the ones worth pursuing, start here.