How to Buy a SaaS Business

How to buy a SaaS business with a repeatable process

If you are working out how to buy a SaaS business, the hard part is rarely finding listings. It is building a process that rejects most of them quickly, prices the rest honestly, and closes the right one without inheriting problems you did not see. A small software acquisition can look simple: some code, a domain, a few hundred customers. In practice you are buying a stream of future cash flow that depends on retention, transferable accounts, clean intellectual property, and your ability to run the product once the founder leaves.

This guide sets out that process from thesis to handover. It deliberately stays at the process level; for the detailed checks, use our startup buyer due diligence guide, and for pricing mechanics, see micro-SaaS valuation. Nothing here is legal, tax, or investment advice. The U.S. Small Business Administration suggests working with an attorney and accountant who can help you create and evaluate documents such as the letter of intent, confidentiality agreement, and sales agreement (SBA, “Buy an existing business or franchise”).

Step 1: Write an acquisition thesis

A thesis keeps you from buying whatever happens to be listed this week. Put these on one page:

Budget and structure: total capital, how much you can lose, and whether you will use debt, seller financing, or partners.
Operator fit: which skills you bring (engineering, marketing, sales, support) and which you would hire.
Target profile: business model (B2B or B2C, subscription or usage-based), price point, minimum revenue or profit, and acceptable growth trend.
Hard exclusions: for example, heavy dependence on one platform's API, regulated data you cannot handle, or a single customer above a set share of revenue.
Value-creation plan: what you will do differently. Pricing, distribution, retention, or product? If your answer is “nothing,” you are underwriting the status quo, which should be priced accordingly.

Step 2: Build a deal pipeline

Most buyers need to review many opportunities to find one worth pursuing. Sources include:

Marketplaces and brokers, which aggregate listings and standardize some information. See how RevenueBug compares with Acquire, Flippa, and Microns.
Founder networks and communities, where many small products change hands without a formal listing.
Direct outreach to products that fit your thesis but are not advertised as for sale.
Verified revenue profiles. On RevenueBug, you can browse startups for sale, filter by category such as SaaS businesses for sale, and send a private inquiry to the founder. Profiles show trailing 30-day revenue calculated from a connected payment provider. That is useful screening evidence, but it is not subscription MRR, not an audit, and not a valuation; RevenueBug does not broker, escrow, or transfer businesses (methodology).

Track every opportunity in a simple pipeline: source, date, asking price, headline metrics, status, and the reason you passed. Your pass reasons will sharpen your thesis.

Step 3: Screen fast

Screen before you invest real time. A first-pass screen should take under an hour and answer:

Does it fit the thesis? If not, pass politely.
Is the revenue the right kind? Recurring subscriptions, one-time sales, and services revenue deserve very different treatment. See MRR vs ARR and gross vs net revenue.
Is the trend acceptable? Ask for monthly revenue for at least the last 12–24 months, not just a snapshot.
Why is the founder selling? Listen for consistency with the numbers.
What would make this a no? Identify the single biggest risk and ask about it directly.

Sign an NDA before receiving sensitive information, and keep your early questions short. Sellers talk to many tire-kickers; a buyer who asks precise questions and responds quickly gets better access.

Step 4: Build your own valuation

Do not anchor on the asking price. Build a valuation from the business's normalized numbers:

Normalize MRR and ARR so annual plans and one-time charges are treated correctly. The MRR and ARR calculator helps.
Rebuild seller's discretionary earnings, removing add-backs you do not believe and adding the cost of replacing the founder's labor. See SDE vs EBITDA.
Check retention with the churn and retention calculator.
Run downside, base, and upside cases in the SaaS valuation calculator.
Test your return, payback, and debt coverage in the startup acquisition ROI calculator.

The SBA notes there are many methods for determining a fair price, including capitalized earnings, excess earnings, cash flow, and tangible-asset approaches, and that the cash flow method is typically used to estimate how much loan the business's cash flow can support (SBA). For small owner-operated software, the cash-flow view usually matters most: can the business pay you, service any debt, and survive a bad year?

Step 5: Arrange financing early

Know how you will pay before you sign an LOI. Common sources for small SaaS acquisitions:

Cash from savings or investors, which is simplest and gives sellers the most certainty.
Seller financing, where part of the price is paid over time under a promissory note. It aligns the seller with a smooth transition but adds credit risk for them.
Earnouts, where part of the price depends on future performance. Useful for bridging valuation gaps, but they invite disputes if drafted loosely. See earnouts.
Bank and SBA-backed loans. The SBA lists “changes of ownership (complete or partial)” as a permitted use of 7(a) loans, and states that the maximum 7(a) loan amount is $5 million (SBA, 7(a) loans). Lender requirements, collateral, and eligibility vary, and asset-light software can be harder to finance than businesses with tangible collateral. Talk to lenders before you make an offer.

Step 6: Make an offer with a letter of intent

Your LOI should state the price, how and when it is paid, deal structure, diligence period, exclusivity, conditions to closing, and transition expectations. Most LOIs are non-binding except for a few provisions such as confidentiality and exclusivity, and ambiguous drafting can lead a court to treat terms as binding (Harris Sliwoski). Our guide to the startup acquisition LOI explains each term.

For buyers, the essentials are:

Exclusivity long enough to finish diligence and financing.
Structure: most small buyers prefer an asset purchase so they choose which liabilities to take on. See asset purchase vs stock purchase.
Price mechanics that match your risk view: escrow, holdback, seller note, or earnout.
Transition support with a defined number of hours or weeks.

Step 7: Run diligence in stages

After the LOI, verify what you were told. A staged approach, covered in our due diligence guide, works well:

Reconcile revenue from billing records to payouts to bank deposits.
Analyze cohorts, churn, and concentration.
Review code, infrastructure, security, and third-party dependencies.
Confirm legal ownership of code, domains, trademarks, and data, plus contractor IP assignments.
Map every account that must transfer, and confirm it can.

Convert each finding into a response: walk away, reprice, add an escrow or specific indemnity, add a closing condition, or accept the risk.

Step 8: Close and transfer accounts

The purchase agreement replaces the LOI with binding terms: representations and warranties, indemnification, escrow, schedules of assets, and closing deliverables. Have your own lawyer review it.

Then plan the migration. Payment accounts are often the most delicate. Stripe asks the existing owner to contact Stripe Support before transferring an account after a sale, and handles cross-border acquisitions differently (Stripe Support). Other providers have their own processes; check them during diligence, not on closing day. Mobile apps transfer through Apple's app transfer flow, which has criteria and limitations such as merchant IDs that do not transfer (Apple Developer).

In an asset purchase, buyer and seller generally each report the price allocation on IRS Form 8594 (IRS). Agree the allocation before closing with tax advice, because it affects your future deductions.

Step 9: The first 90 days

Resist the urge to change everything immediately. A sensible first quarter:

Weeks 1–4: keep the product stable, shadow the founder, take over support, and confirm every account and credential works.
Weeks 5–8: fix obvious operational risks (backups, monitoring, security patches) and talk to customers.
Weeks 9–12: begin executing your value-creation plan with measured experiments, such as pricing tests or new acquisition channels.

Track MRR, churn, and support volume weekly so you notice quickly if the transition is hurting retention.

Common buyer mistakes

Buying without a thesis, then rationalizing the purchase.
Anchoring on the seller's multiple instead of building your own valuation.
Treating trailing processor revenue as recurring revenue.
Underestimating the founder's hidden workload.
Signing an LOI before financing is lined up.
Skipping the account-transfer review until closing day.

Frequently asked questions

How much money do I need to buy a SaaS business?

Enough for the purchase price, transaction costs (legal, accounting, escrow), and a cash buffer for the first months of operation. If you use debt or seller financing, make sure the business's cash flow can cover payments in a downside case.

Is it better to buy or build a SaaS?

Buying gives you existing customers and revenue but costs more upfront and carries inherited risk. Building is cheaper in cash but slower and uncertain. Buying makes sense when you can add value the current owner has not, and when the price leaves room for your return.

What is a reasonable price for a small SaaS?

There is no universal multiple. Price depends on profit, growth, retention, concentration, founder dependence, and deal terms. Build low, base, and high cases with the SaaS valuation calculator and read micro-SaaS valuation.

Should I buy assets or the company?

Buyers of small businesses often prefer asset purchases to limit inherited liabilities, but contracts, licenses, and tax considerations can favor a stock purchase. Get legal and tax advice before setting structure in the LOI.

How do I know the revenue is real?

Reconcile billing data to payouts and bank deposits, review customer-level records, and analyze cohorts. Provider-verified revenue, such as RevenueBug profiles, is a helpful starting point but does not replace your own reconciliation.

Can I buy a SaaS business through RevenueBug?

You can discover startups marked for sale and send private inquiries to founders. RevenueBug does not broker, escrow, provide legal help, or transfer businesses; the deal is negotiated and closed between you, the seller, and your advisers.