Price Adjustment Notice Mexico (Carta de Ajuste de Precio)

A Price Adjustment Notice Mexico (Carta de Ajuste de Precio) is a formal written communication by which a supplier, vendor, or service provider notifies a commercial counterparty — customer, distributor, or contracting party — of an upcoming change to the price of goods, services, or contractual deliverables. In Mexico, price adjustment notices are governed primarily by the Código de Comercio (CCom) Article 75, which classifies commercial correspondence and price modification communications as actos de comercio, and by the Código Civil Federal (CCF) Article 1796, which establishes the binding nature of contracts and the conditions under which contractual terms — including pricing — may be modified by agreement or in accordance with an existing contract clause.

The legal framework for price adjustment in Mexican commercial contracts is further shaped by CCF Articles 1793 through 1860, which govern contract formation, modification, and performance obligations. Article 1797 CCF provides that contracts are binding from the moment they are perfected — meaning that a unilateral price change without contractual authority or advance notice may constitute incumplimiento (breach) under Article 1949 CCF, entitling the counterparty to seek rescission or damages before the Juzgado de Distrito en Materia Civil Federal or the Centro de Arbitraje de México (CAM) if the contract provides for arbitration.

Price adjustment notices in Mexico are particularly significant in the context of supply agreements (contratos de suministro), distribution agreements (contratos de distribución), and long-term service contracts governed by CCom Article 75. The Cámara Nacional de Comercio (CANACO) and the Confederación de Cámaras Industriales de los Estados Unidos Mexicanos (CONCAMIN) both recognise price escalation clauses — cláusulas de ajuste de precio or cláusulas de escalación — as standard elements of commercial contracts in sectors subject to commodity price volatility, exchange rate fluctuations, or inflation-indexed cost structures.

Inflation adjustment mechanisms in Mexican commercial contracts frequently reference the Índice Nacional de Precios al Consumidor (INPC) published monthly by the Instituto Nacional de Estadística y Geografía (INEGI) under the Ley del Sistema Nacional de Información Estadística y Geográfica (LSNIEG). Where a supply contract provides for INPC-based price escalation, the Carta de Ajuste de Precio serves as the formal trigger notification — documenting the calculation, the applicable INPC base and current period indices, and the resulting adjustment percentage.

In government procurement (contratación pública), price adjustments in contracts awarded under the Ley de Adquisiciones, Arrendamientos y Servicios del Sector Público (LAASSP) and the Ley de Obras Públicas y Servicios Relacionados con las Mismas (LOPSRM) follow a strictly regulated process — Article 46 LAASSP permits price escalation only when the contract expressly provides for it and only through a formal addendum (convenio modificatorio) signed by both parties. A Carta de Ajuste de Precio to a government entity is the initiating document for the convenio modificatorio process.

For consumer-facing commercial relationships regulated by the Procuraduría Federal del Consumidor (PROFECO) under the Ley Federal de Protección al Consumidor (LFPC), Article 7 LFPC requires that prices offered to consumers be respected once stated — a business may not unilaterally raise a price after a consumer has placed an order based on a quoted price. Advance notice through a formal Carta de Ajuste de Precio — clearly stating the effective date and the new pricing — is essential for PROFECO compliance in B2C contexts.

A Price Adjustment Notice Mexico is needed whenever a business intends to modify the price of goods or services provided under an existing commercial agreement, supplier relationship, or ongoing service arrangement — and the contract requires written notice or the parties' commercial practice calls for formal advance notification.

The Carta de Ajuste de Precio is required in supply chain contexts where a manufacturer, distributor, or raw material supplier experiences cost increases — due to currency depreciation of the Mexican peso (MXN) against the US dollar, increases in petroleum prices affecting logistics costs, changes in tariffs under the Tratado entre México, Estados Unidos y Canadá (T-MEC/USMCA), or rises in the INPC published by INEGI — and needs to pass those costs to commercial buyers under the terms of a supply agreement.

The notice is needed when an annual pricing review under a long-term service contract (contrato de servicios a largo plazo) under CCom Article 75 is due — most Mexican commercial contracts of one year or more include a review clause (cláusula de revisión de precios) that requires written notice of any adjustment at least 30 to 90 days before the effective date.

A formal Carta de Ajuste de Precio is required in distribution relationships governed by an exclusive distribution agreement (contrato de distribución exclusiva) where the supplier is adjusting the recommended retail price list (lista de precios sugeridos al público) or the wholesale price to distributors — changes to price lists that affect distributor margins must be communicated in writing with sufficient advance notice to allow the distributor to manage existing inventory and customer commitments.

The document is also needed in professional services engagements — consulting, accounting, legal, engineering, or technology services governed by CCF Article 2606 (contrato de prestación de servicios profesionales) — where the service provider is adjusting hourly rates, monthly retainer fees, or project-based pricing for the following contract period. Written price adjustment notices in professional services create a clear paper trail for billing disputes and are required documentation if the client disputes an invoice before PROFECO or in civil litigation.

Under CCom art. 75, CCF art. 1796, and LAASSP art. 46, Mexican businesses operating under long-term commercial agreements should issue a formal written price adjustment notice well in advance of the effective date — oral notifications or informal email exchanges are insufficient evidence of proper contractual notice in CANACO mediation, CAM arbitration, or federal civil court proceedings.

A valid Price Adjustment Notice Mexico under the Código de Comercio and the Código Civil Federal must contain the following essential elements to be effective as contractual notice and enforceable in Mexican commercial dispute resolution:

Identification of Parties and Contract Reference: Full legal name, RFC, and domicilio of the notifying party (issuer) and the recipient — whether a company with Registro Público de Comercio reference or an individual. The notice must reference the specific contract, framework agreement (contrato marco), or purchase order series to which the price adjustment applies — including the contract number or date — so that the recipient can identify precisely which commercial relationship is affected.

Current and New Pricing: A clear, itemised comparison of the current price (precio actual) and the new price (precio nuevo) for each affected product, SKU (stock keeping unit), service category, or billing rate. Where the adjustment affects a price list of multiple items, the notice should attach or reference the updated price list as an annex (anexo). Prices must be expressed in Mexican pesos (MXN) with the applicable IVA (Impuesto al Valor Agregado, currently 16% under the Ley del Impuesto al Valor Agregado) treatment stated clearly — whether prices are expressed with IVA included (precio con IVA) or without IVA (precio sin IVA, más IVA).

Adjustment Percentage and Justification: The percentage increase or decrease and the factual and contractual basis for the adjustment. Standard justifications include: INPC inflation adjustment calculated from the base period to the current period using INEGI published indices; foreign exchange rate movement of the MXN/USD pair as published by Banco de México (Banxico) in the Diario Oficial de la Federación; increases in specific input costs (materias primas, energía, fletes) supported by documentary evidence; minimum wage adjustments under the Comisión Nacional de los Salarios Mínimos (CONASAMI) affecting labour-intensive service costs; or tariff changes under T-MEC/USMCA published by the Servicio de Administración Tributaria (SAT).

Contractual Authority: Reference to the specific clause (cláusula) in the existing contract that authorises the price adjustment — the escalation clause, review clause, or force majeure clause under which the adjustment is justified. Where no specific contractual clause authorises the adjustment, the notice must request the counterparty's acceptance (aceptación), making clear that the adjustment is a contract modification proposal subject to the counterparty's agreement under CCF Article 1794.

Effective Date and Notice Period: The date from which the new prices will apply (fecha de vigencia del ajuste) — which must comply with the contractual notice period, if any, and must be a specific calendar date. Standard commercial practice in Mexico for established supplier relationships calls for minimum 30 days' advance notice; LAASSP contracts and distribution agreements frequently require 60 to 90 days. The notice must be clear that existing purchase orders placed and accepted before the effective date are filled at the current price.

Response Deadline and Acceptance Mechanism: A deadline by which the recipient must communicate acceptance, rejection, or a counter-proposal — typically 15 to 30 business days (días hábiles) from receipt of the notice. The notice should specify the acceptable form of acceptance — written response, signed acknowledgment (acuse de recibo firmado), or electronic confirmation — and state the consequence of silence, particularly whether silence constitutes deemed acceptance or deemed rejection under the existing contract terms.

Contact Information and Escalation Path: Name, title, telephone, and email of the commercial contact responsible for the price adjustment negotiation on the issuer's side, and the appropriate escalation contact if the recipient wishes to discuss the adjustment. Where the commercial relationship is managed under a distributor agreement with CANACO membership, the notice may reference the CANACO conciliation procedure as a first-step dispute resolution mechanism.

Forms-legal.com provides this Price Adjustment Notice Mexico template as a starting point for commercial correspondence. Businesses in regulated sectors — energy, telecommunications, financial services, or government contracting — and those whose contracts contain arbitration clauses before the CAM or the Centro de Mediación y Arbitraje de la Cámara de Comercio Internacional (ICC México) should consult a Licenciado en Derecho specialised in derecho mercantil before issuing price adjustments that may trigger contractual dispute procedures.