An import tax stack for sulfuric acid is constructed differently in the three target jurisdictions because each applies a distinct sequence of customs duty, value-added or turnover tax, industrial excise, and local cess-like charges. The present technical scope is Brazil, Mexico and Vietnam: Sulfuric Acid Import Tax Stack and Local Cesses. Sulfuric acid is traded under HS heading 2807, with subheadings distinguishing concentrated acid, oleum, and other grades. The principal classification codes are NCM 2807.00.10 and NCM 2807.00.20 in Brazil, LIGIE 2807.00.01 and LIGIE 2807.00.02 in Mexico, and AHTN 2807.00.00 in Vietnam. The product is classed as UN 1830, Class 8, Packing Group II under the IMDG Code; the transport classification does not set the tax rate, but it triggers port, storage, and terminal fees that often behave as local cesses.

The base of the stack is customs value, normally transaction value under Article 1 of the WTO Valuation Agreement. Each subsequent tax is calculated either on the CIF value or on a cumulative base that includes the prior layers. In Brazil, the federal import duty is followed by the industrial products tax, PIS/PASEP-Import and COFINS-Import, and state ICMS. Mexico applies the general import tax, the customs processing fee, and VAT. Vietnam applies import duty, VAT, and, when a product is listed in the environmental protection tax schedule, environmental protection tax. Sulfuric acid is not listed in Vietnam’s environmental protection tax schedule, so that layer is absent unless the importer triggers local wastewater fees through storage, dilution, and handling.

How Does the Brazilian Stack Apply to NCM 2807.00.10 and Which Local Charges Behave as Cesses?

Under the Mercosur Common Nomenclature, NCM 2807.00.10 covers sulfuric acid and NCM 2807.00.20 covers oleum. The published Common External Tariff rate for NCM 2807.00.10 is 0% for many non-preferential entries, but the applied rate can change if the NCM is placed on Brazil’s Lista de Exceções à TEC. The importer must verify the current Tratamento Tributário in Siscomex because the administered rate, not the published TEC headline, defines the first layer. The industrial products tax, IPI, for this line is also 0% in the current TIPI schedule, so the federal impost on the product itself is largely shifted to the PIS/PASEP-Import and COFINS-Import layer.

PIS/PASEP-Import and COFINS-Import are charged under Law 10,865/2004. For most chemical import NCMs, the statutory pair is 1.65% and 7.60%, yielding a combined 9.25% on the CIF value plus II and IPI. Some chemical lines are subject to the 2.10% and 9.65% pair, so the importer must confirm whether NCM 2807.00.10 falls in the standard or elevated band. These federal contributions are non-cumulative for industrial importers; they are recoverable as input credits against output PIS/PASEP and COFINS when the acid is used in taxable production operations, subject to the credit-settlement rules of Law 10,865/2004.

The state-level ICMS is the most variable local layer. State laws commonly apply 12%, 18%, or 20% to imported industrial raw materials, but the effective internal rate depends on the destination state and any CONFAZ agreement reducing the tax base for chemical inputs. The ICMS base includes the CIF value, import duty, IPI, PIS/PASEP-Import, COFINS-Import, and certain customs and port charges. Industrial purchasers can credit the ICMS paid on import against output ICMS in subsequent transactions, but fragmented state rules create working-capital timing differences, especially where the imported acid is transferred between establishments before being consumed in fertilizer granulation or metal pickling.

Maritime imports into Brazil are also subject to the Additional Freight for the Renewal of the Merchant Marine under Law 10,893/2004, levied at 8% on the ocean freight element rather than on the CIF value. At sulfuric acid terminals in Santos and Paranaguá, stevedoring, storage, and environmental risk fees are charged per tonne or per operation. These fees are not classified as customs duties, but they operate as local cesses that increase the landed cost stack without generating ICMS or PIS/COFINS credit. Published data for port-level cesses are limited because terminal tariffs and municipal environmental fees are not consolidated in a single national schedule.

For shipments cleared through Manzanillo, Altamira, or Veracruz, the Mexican stack applies LIGIE lines for sulfuric acid and oleum rather than the Mercosur schedule. The general import duty for sulfuric acid under LIGIE is frequently 0% to 5% for non-preferential entries; imports from USMCA partners may receive 0% treatment when a valid certificate of origin, NOM compliance, and direct shipment requirements are met. The value-added tax is 16% on a base that includes CIF value, general import duty, and the customs processing fee. Unlike Brazil, Mexico does not impose a state VAT; IVA is a federal tax, although port and municipal environmental charges create a local fee layer.

The Derecho de Trámite Aduanero is a customs processing fee assessed under Article 49 of the Federal Law of Rights. It is commonly expressed as 0.008 on customs value, with minimum and cap values set in the federal fee schedule. The DTA is not creditable against IVA. Mexico does not apply IEPS to sulfuric acid because the product is not enumerated in the excise schedule; however, storage terminals may be subject to state and municipal wastewater discharge fees based on pH, sulfate load, and flow volume. At the Mexico–US border, IMMEX operations can suspend the general import duty and defer IVA for processors that re-export the acid-containing output, but DTA may still apply unless the program authorization states otherwise. This is a common audit point because companies may classify the acid as a transferred asset but omit the customs processing fee.

Vietnam’s Import Duty, VAT and Environmental Fee Mapping for HS 2807.00.00

Vietnam classifies sulfuric acid under AHTN heading 2807.00.00. The MFN import duty falls in a low band—commonly 0% to 5% in the current Decree on import and export duty schedules—while imports from ASEAN member states are generally eligible for 0% under ATIGA if the consignment has a valid Form D certificate of origin and complies with the direct shipment rule in Decree 134/2016/ND-CP. The import duty is computed on the CIF value. The value-added tax is then applied at the standard rate of 10% on the CIF value plus import duty. Temporary VAT reductions to 8% under recent support decrees are limited to a positive list of goods and services; sulfuric acid is not commonly named, so the default 10% rate should be used unless the importer holds a specific written confirmation.

With the transition to Law 48/2024/QH15 and its implementing schedules, importers must verify whether changed VAT credit treatment affects sulfuric acid as an input. The product is not subject to special consumption tax, and it is absent from the environmental protection tax schedule under Law 57/2010/QH12. Therefore the principal non-VAT local charge arises only where the importer stores or dilutes acid on-site. Facilities that discharge spent rinse water or treated effluent must pay environmental protection fees on industrial wastewater; the fee calculation is based on pollutant load parameters—COD, TSS, and pH—rather than on acid import value. The relevant technical limits for wastewater discharge are set out in QCVN 40:2011/BTNMT and later updates; pH excursions from acid handling commonly require neutralization before release.

For importers that store sulfuric acid at a chemical distribution depot, the facility must obtain a hazardous chemical permit under Decree 113/2017/ND-CP and comply with storage separation distances for corrosive chemicals. The permit does not alter the import duty but can add compliance costs that behave as an administrative cess. In addition, Vietnam’s customs system requires the import duty and VAT to be paid before release, unless the importer has a bank guarantee for monthly VAT payment or is approved for deferred payment under the Law on Tax Administration 38/2019/QH13. This creates cash-flow timing differences relative to Mexico, where VAT is paid simultaneously at customs but may be credited in the same tax period.

When Sulfuric Acid Is Imported by Sea, Freight and Storage Charges Feed the Stack Differently by Jurisdiction

The maritime movement of sulfuric acid creates additional local charges that are not always visible in the tariff schedule. A chemical tanker delivering 96% to 98% acid to Brazilian terminals uses stainless-steel unloading arms or acid-resistant lined hose; shore tanks are commonly carbon steel with a corrosion allowance of 6 mm to 10 mm. At 98% concentration and ambient temperature, carbon steel passivates, and corrosion rates can remain below 0.1 mm/year; dilution below 65% raises the attack rate and requires stainless steel, PTFE-lined pipe, or fiberglass-reinforced plastic storage. These materials decisions influence terminal handling tariffs and safety surcharges.

Brazil adds AFRMM at 8% on ocean freight to the stack, whereas Mexico and Vietnam do not impose an equivalent freight tax at the federal import level. Mexican ports recover handling and storage costs through terminal tariffs and the DTA; Vietnamese terminals at Ho Chi Minh City and Hai Phong impose stevedoring and storage fees that may be billed in Vietnamese dong per tonne-day. In all three jurisdictions, the demurrage and berth charges for a hazardous cargo such as UN 1830 are higher than for non-dangerous goods, and these local cess-like charges do not generate VAT credits. Sulfuric acid must be segregated from alkalis, hypochlorites, and combustible organics under IMDG Code stowage requirements; failures in segregation can trigger port safety interventions and additional detention charges.

Customs valuation differences interact with these stacks at the margin. Under Article 1 of the WTO Valuation Agreement, the transaction value of identical bulk acid may differ because of freight and terminal allowances. Brazil collects PIS/PASEP-Import and COFINS-Import on a CIF-plus-import-duty-plus-IPI base, so any incremental ocean freight charge also increases the social contribution layer. Mexico applies DTA to the customs value and then applies IVA on a cumulative base that includes the DTA, creating a small compounding effect. Vietnam applies import duty and then VAT on the duty-inclusive CIF value. Importers should separate charges that enter the customs value from those that are excluded, such as separately declared post-import storage provided the invoice and contract support the separation under national customs valuation rules.

In Vietnam’s chemical distribution segment, imported sulfuric acid moving to fertilizer or lead-acid battery production is normally governed by long-term supply contracts in which the VAT, import duty, and terminal fees are itemized at the shipment level. The absence of a local cess schedule for sulfuric acid in Vietnam, and the absence of IEPS in Mexico, should be confirmed against the current official tariff and fee schedules at the time of each shipment. Likewise, Brazilian importers should verify the NCM-specific PIS/COFINS band and the current LETEC status because the published TEC headline rate alone does not close the compliance question.