What is an SA de CV and what is a SAPI de CV
The SA de CV (Sociedad Anónima de Capital Variable) is the most common corporate structure in Mexico. It is regulated by the General Law of Commercial Companies (LGSM) and is the standard gateway for any business that wants to operate as a legal entity, issue electronic invoices, hire employees and distribute profits among partners. Its variable capital allows the company to increase or decrease capital without amending the bylaws for each operation.
The SAPI de CV (Sociedad Anónima Promotora de Inversión de Capital Variable) was created in 2006 through reforms to the Securities Market Law (LMV) to help private companies access risk capital without needing to list on the stock exchange. In essence, it is an SA de CV with much more flexible bylaws: it allows different share classes, investor and partner protection clauses, and corporate governance mechanisms that a traditional SA does not permit. The original purpose was to allow startups and high-growth companies to receive investment from private equity (PE) or venture capital (VC) funds without changing their legal form.
The key difference: corporate governance, not taxes
The first point every entrepreneur must understand: from a tax perspective, SA de CV and SAPI de CV are identical. Both are taxed as corporations under Title II of the LISR, pay 30% ISR on taxable income, generate monthly VAT obligations, file the annual return in March and have the same payroll obligations if they have employees.
The real difference lies in the architecture of rights between shareholders. SAPI allows the bylaws to include mechanisms that the LGSM does not contemplate for a traditional SA:
- Different share classes with separate economic and voting rights
- Vesting clauses (minimum tenure before a partner "earns" their full shareholding)
- Drag-along: majority shareholders can force minorities to sell alongside them on the same terms
- Tag-along: minority shareholders can join any sale by the majority on the same terms
- Right of first refusal: preference to acquire shares from a partner who wants to sell
- Anti-dilution clauses protecting early investors in subsequent rounds
- Veto rights per share series on specific strategic decisions
Full comparison table: SA de CV vs SAPI de CV
| Parameter | SA de CV | SAPI de CV |
|---|---|---|
| Legal framework | LGSM (arts. 87–206) | LMV (arts. 12–39) + LGSM supplementary |
| Minimum shareholders | 2 shareholders | 2 shareholders |
| Minimum capital | MXN $50,000 (fixed + variable) | MXN $50,000 (same as SA) |
| Corporate ISR | 30% on taxable income | 30% on taxable income (identical) |
| VAT | 16% / 0% / exempt by activity | Same as SA de CV |
| Share classes | Single class (with limited exceptions) | Multiple series with differentiated rights |
| Shareholders' agreement | Limited — LGSM restricts private agreements contradicting the law | Broad — LMV allows binding private agreements among partners |
| Vesting | Not permitted under LGSM | Expressly permitted under LMV |
| Drag-along / Tag-along | Not recognized in LGSM | Recognized and enforceable under LMV |
| Minority rights | Shareholders with ≥25% can call meeting, contest decisions | Shareholders with ≥10% have equivalent rights |
| Constitution cost | MXN $15,000–$25,000 approx. | MXN $25,000–$45,000 approx. (more complex bylaws) |
| Accounting complexity | Standard | Higher if multiple share series exist |
| Stock exchange listing | Requires prior transformation | Can evolve to SAPIB or listed company |
| Banking recognition | High — banks know this structure well | High, but some bank advisors ask for more explanation |
| Ideal for | SMEs, family businesses, stable operations without external investment | Startups, multi-founder companies, VC/PE candidates |
The clauses only SAPI allows (and what they mean in practice)
When a company receives investment from a venture capital fund or angel investor, the shareholders' agreement is the document that protects all parties. In a traditional SA de CV, many of these clauses are not enforceable because the LGSM does not recognize them. In a SAPI, they are, because the LMV expressly regulates them.
Vesting: Two co-founders create a company and agree that each has 50% from day one. Six months later, one leaves. Without vesting, the departing co-founder keeps their 50%. With vesting, the percentage is "earned" gradually — for example, over four years with a one-year cliff (leave before year one and you get nothing; stay for three years and you have 75%). It is the most important mechanism for protecting the founding team and investors.
Drag-along: When majority shareholders receive an attractive acquisition offer for the whole company but minorities do not want to sell, drag-along allows the majority to "drag" the minorities into the sale on the same terms. Without this clause, a minority holder with 5% can block a full company sale.
Tag-along: The reverse mechanism. If the majority founder sells their stake to a third party, minority shareholders have the right to sell under the same conditions. It protects minorities from being stuck with new partners they did not choose.
Anti-dilution: When a company raises a round at a lower valuation than the previous one (down round), early investors can see their stake significantly diluted. Anti-dilution clauses — full ratchet or weighted average — protect those investors by adjusting the conversion price of their shares.
Does SAT treat SA de CV and SAPI de CV the same?
Yes, completely the same. For SAT, both structures are general-regime corporations. They file the same returns (monthly VAT, monthly ISR provisional payments, annual return in March), have the same electronic accounting obligations (CFDI, DIOT, trial balance), and pay the same 30% ISR rate on taxable income plus an additional 10% ISR on distributed dividends.
The only accounting difference that may arise in a SAPI occurs when there are multiple share series with different economic rights (e.g., Series A with preferred dividends and Series B with ordinary dividends). In that case, the accounting must correctly record the distribution of results by series, which adds complexity to the monthly close and the dividend ISR calculation. For more detail on the corporate tax regime, see our complete ISR guide for corporations in Mexico 2026.
Real constitution costs: what is included and what is not
Prices found online are often outdated or incomplete. In practice, 2026 constitution costs include notary fees, Registro Público de Comercio registration fees, Secretaría de Economía procedures and, for SAPI, the corporate lawyer's fees for drafting the shareholders' agreement (which is separate from the notarial bylaws).
| Item | SA de CV | SAPI de CV |
|---|---|---|
| Notary fees | MXN $8,000–$15,000 | MXN $15,000–$25,000 (more extensive bylaws) |
| Registro Público de Comercio | MXN $1,500–$3,000 | MXN $1,500–$3,000 |
| Secretaría de Economía | MXN $500–$1,000 | MXN $500–$1,000 |
| Shareholders' agreement (corporate lawyer) | Not applicable / optional | MXN $8,000–$18,000 (essential) |
| Estimated total | MXN $10,000–$19,000 | MXN $25,000–$47,000 |
| Estimated timeline | 3–6 weeks | 4–8 weeks |
The cost difference between the two structures is not just in notary fees, but fundamentally in the shareholders' agreement. A well-drafted agreement for a SAPI expecting investment is a 30 to 60 page document that must anticipate scenarios of investment rounds, dilution, exit, founder vesting and liquidation preference rights. That work requires a specialized lawyer — it should not be improvised.
How to convert an SA de CV to SAPI de CV
If you already have an SA de CV and are in the process of raising capital, there is no need to dissolve and reconstitute. The conversion is relatively straightforward:
- Extraordinary General Shareholders' Meeting approving the transformation from SA de CV to SAPI de CV. The quorum and majority required by the current bylaws for statutory amendments must be met.
- Drafting of new bylaws incorporating LMV provisions for SAPI: share classes, shareholder protection mechanisms, and the desired clauses.
- Public deed before a notary formalizing the transformation and new bylaws.
- Registration at the Registro Público de Comercio of the transformation.
- RFC update with SAT: the RFC does not change, but if the corporate name changes, it must be reported, and the company data updated on the SAT portal.
Estimated conversion cost: MXN $18,000–$35,000. The process does not interrupt business operations or tax obligations.
For foreigners: which is better?
If you are a foreigner opening a company in Mexico, the choice between SA de CV and SAPI depends on one key factor: will you receive investment from funds or external partners in the next 2–3 years?
If the answer is no — if your company is a family operation, a professional services agency, a consulting firm or a self-funded business — SA de CV is sufficient, cheaper and simpler to manage. If the answer is yes or "maybe", SAPI de CV establishes from the start the legal architecture that investment funds expect to find, which speeds up due diligence and avoids having to do the conversion precisely when there is an investment offer on the table (the worst possible moment for notarial procedures).
For opening a business bank account, both structures are treated the same. Mexican banks show no preference for one over the other; account opening requirements are practically identical.
Decision tree: SA de CV or SAPI de CV?
Answer these five questions in order:
- Do you plan to receive investment from VC, PE or angel funds in the next 3 years? → If yes: SAPI de CV. If not, continue.
- Do you have 3 or more co-founders with different roles and commitments? → If yes: SAPI (vesting protects everyone). If not, continue.
- Do you need to offer stock options or shares to key employees? → If yes: SAPI. If not, continue.
- Are you in an industry where funding rounds are common (tech, biotech, fintech)? → If yes: SAPI, even without investors today. If not, continue.
- Is your company a family business, professional services firm or traditional retail with no plans to scale with external investment? → SA de CV. It is the right structure for 80% of Mexican businesses.
As a complementary reference, if you are considering other structures — such as a civil partnership — see our comparison of Sociedad Civil vs SA de CV which explains when SC is more convenient for professionals.
Tax and accounting obligations once the company is incorporated are the same in both cases. To understand them fully before deciding, we recommend reviewing our annual return guide for corporations, which applies equally to SA de CV and SAPI de CV.