Los Cabos Acquisition Tax (ISAI)
Acquisition Tax (ISAI) is a mandatory government tax paid by the buyer when real estate ownership is transferred in Mexico.
Who Pays
Buyer
Buyer Pays Fees
When
Closing
(calculated and paid before registration)
Primary Authority
Mexican Notary Public
State / Municipal Tax Authority
(calculated and collected by the notary, remitted to the government)
Summary
Acquisition Tax, commonly referred to as ISAI, is a government-imposed tax payable upon the transfer of real estate ownership in Mexico. It is calculated as a percentage of the property’s assessed or declared value and is collected as part of the closing process. Understanding how ISAI is calculated and applied is essential for accurately evaluating total acquisition costs.
Key Expalnation
ISAI is assessed by state and municipal authorities and is typically calculated by the notary handling the transaction. The applicable rate and valuation method can vary depending on location, property type, and declared value, making early clarification important for budgeting purposes.
Detailed Guidance
The notary calculates ISAI during the final stages of the transaction and includes it in the closing statement. Payment is required before the property can be registered in the buyer’s name at the Public Registry. ISAI applies to both domestic and foreign buyers and is unavoidable in standard property transfers.
Buyers often assume ISAI is included in the purchase price or that it is a fixed nationwide rate. In practice, rates vary by state and are calculated independently of negotiated pricing.
Underestimating ISAI can result in funding shortfalls or closing delays. Buyers should confirm the applicable rate and valuation basis early in the transaction to avoid last-minute adjustments.
Request an estimated ISAI calculation from the notary during due diligence and confirm whether the tax is based on assessed value or purchase price. Conservative budgeting is advised.
Los Cabos Acquisition Tax (ISAI)
Acquisition Tax (ISAI) is a mandatory government tax paid by the buyer when real estate ownership is transferred in Mexico.
Transaction Mechanics
Who Pays
Buyer
Buyer Pays Fees
When
Closing
(calculated and paid before registration)
Primary Authority
Mexican Notary Public
State / Municipal Tax Authority
(calculated and collected by the notary, remitted to the government)
Summary
Acquisition Tax, commonly referred to as ISAI, is a government-imposed tax payable upon the transfer of real estate ownership in Mexico. It is calculated as a percentage of the property’s assessed or declared value and is collected as part of the closing process. Understanding how ISAI is calculated and applied is essential for accurately evaluating total acquisition costs.
Key Expalnation
ISAI is assessed by state and municipal authorities and is typically calculated by the notary handling the transaction. The applicable rate and valuation method can vary depending on location, property type, and declared value, making early clarification important for budgeting purposes.
Detailed Guidance
The notary calculates ISAI during the final stages of the transaction and includes it in the closing statement. Payment is required before the property can be registered in the buyer’s name at the Public Registry. ISAI applies to both domestic and foreign buyers and is unavoidable in standard property transfers.
Common Misconceptions
Buyers often assume ISAI is included in the purchase price or that it is a fixed nationwide rate. In practice, rates vary by state and are calculated independently of negotiated pricing.
Underestimating ISAI can result in funding shortfalls or closing delays. Buyers should confirm the applicable rate and valuation basis early in the transaction to avoid last-minute adjustments.
Risk Consideration
Best Practice Advisory Notes
Request an estimated ISAI calculation from the notary during due diligence and confirm whether the tax is based on assessed value or purchase price. Conservative budgeting is advised.
Structural Framework Connection
Guidance for discerning buyers navigating Los Cabos luxury market
Zon Murray has spent over four decades living along the Baja coastline, with firsthand experience of how the Pacific and the Sea of Cortez behave across different seasons, conditions, and locations.
From surf breaks to swimmable beaches, each stretch of coastline offers a distinct environment — shaped by wind, swell, and exposure — often in ways that are not immediately visible.
This perspective provides a clearer understanding of how each beach functions day-to-day, and how that translates into lifestyle, access, and long-term real estate value.
Through Cabo Coastal, this insight is refined and structured, with transactions executed through Diamante Realtors.
Zon Murray brings over 40 years of experience in Los Cabos, with a detailed understanding of how ownership structures and transactions function within the region.
From fideicomiso arrangements to contract structuring, due diligence, and closing processes, each stage requires careful coordination between legal, financial, and regulatory elements.
This perspective focuses on clarity and risk awareness, ensuring that each transaction is approached with structure rather than assumption.
Through Cabo Coastal, guidance is provided with a strategic overview, while execution is handled through Diamante Realtors in coordination with the appropriate legal and notarial parties.
Understanding transaction mechanics is the foundation - strategic advisory os the advantage.
