CBS/IBS cashback in the Brazilian Tax Reform.
Personalized refund to low-income families — mechanics, percentages and impact on utilities, telecoms and retail.

Constitutional grounding and rationale of the cashback

EC 132/2023 art. 158 — constitutional grounding

Cashback was raised to a constitutional instrument by art. 158 of the Federal Constitution, in the wording given by EC 132/2023. The provision foresees a refund of IBS and CBS to low-income families, with the explicit purpose of reducing income inequality and the regressivity of consumption taxation. Anchoring the mechanism in the constitutional text was a relevant innovation: it shields the mechanism from ordinary repeal and sets a solid base for technical implementation.

LC 214/2025 arts. 112-125 — statutory regulation

LC 214/2025 detailed the cashback in arts. 112 to 125, organizing the institute around four axes: definition of subjective eligibility (art. 113 — CadÚnico families); identification of the operations covered (art. 116); the refund percentages by category of operation (art. 118); and operation and governance (arts. 114, 115 and 119-125, with a split between the Federal Revenue Service for the CBS and the Steering Committee for the IBS). Complementary Law No. 227/2026, enacted in January 2026, fine-tuned operational points and completed the institutionalization of the IBS Steering Committee, to which a substantial share of managing the mechanism is assigned.

Economic rationale — fighting regressivity

Indirect taxation on consumption is structurally regressive: low-income families spend a proportionally larger share of their budget on essential goods and services that bear CBS and IBS — food, energy, water, transport, cooking gas, communications. Cashback is the instrument designed to correct this distortion. Studies published by the Brazilian Institute of Economics of FGV estimate that the mechanism, combined with the zero rate on the basic food basket, can significantly raise the disposable income of families in the first income quintile, with a differentiated regional impact (more relevant in the North and Northeast). The legislative design seeks distributive effectiveness without compromising the revenue base.

Why cashback instead of a broad zero rate?

The decision to adopt personalized cashback rather than a simple broad zero rate on essential goods reflects a technical diagnosis: a universal zero rate benefits all consumers, including high-income ones, with a revenue loss disproportionate to the distributive impact. Cashback, by contrast, concentrates the benefit on families actually enrolled in CadÚnico, optimizing the effect per real forgone. The trade-off is operational complexity — it requires integration between company systems, federal identification infrastructure and transfer channels — but the gain in distributive efficiency justifies the choice.

Subjective eligibility — who receives it (arts. 113 and 117)

The CadÚnico criterion and per-capita income up to half the minimum wage

Art. 113 of LC 214/2025 sets the central eligibility criterion: cashback reaches families enrolled in the Federal Government’s Single Registry for Social Programs (CadÚnico) with monthly per-capita income up to half the national minimum wage. In 2026, with the minimum wage around R$ 1,518, the per-capita ceiling for eligibility is approximately R$ 759 per person. Considering an average family of 3.2 people, the total family income ceiling is around R$ 2,430 per month — a cut that covers most of the public of federal social programs.

The head of the family unit

The formal beneficiary is the head of the family unit registered in CadÚnico — a single figure that centralizes the transfer to avoid duplication. The deposit is made in an account linked to that head’s CPF, with no need for additional registrations, replicating an operational logic already consolidated in programs such as Bolsa Família, Auxílio Brasil and Auxílio Gás. CadÚnico enrollment — operated by the Municipal Social Assistance Secretariats under supervision of the Ministry of Social Development, Family and the Fight Against Hunger (MDS) — now also has a direct tax function.

Registry maintenance and updating

Eligibility depends on an active, up-to-date CadÚnico registry. The regulation requires a registry update at least every 24 months, on pain of temporary suspension of the benefit. Integration between the CadÚnico registry and the base of taxed operations runs through the CPF — a relevant technical challenge because it requires companies (utilities, telecoms, retail) to capture and store the final consumer’s CPF in each relevant operation. For utilities such as energy and sanitation, the CPF is already frequently captured on the electricity and water bills; for LPG retail, the consumer’s CPF is not captured consistently, which demands process adaptation.

Indigenous and quilombola families — special attention

Indigenous and quilombola families enrolled in CadÚnico receive prioritized treatment within the mechanism, in line with the constitutional provision of art. 231 of the Constitution (original rights over traditionally occupied lands) and with affirmative social-development policies. Operational regulation by the MDS and the Federal Revenue Service organizes the transfer considering the territorial coverage and the specific banking access of these populations — in some cases via Caixa Econômica Federal and through specific cards.

Covered operations and refund percentages (art. 116 + art. 118)

Essential items — refund of 100% of the CBS and 20% of the IBS

Art. 118 of LC 214/2025 sets an increased refund percentage for a defined set of operations with goods and services considered essential:

• Liquefied petroleum gas (LPG) cylinders up to 13 kg — a category covering essentially the household cylinder (P13), excluding larger cylinders intended for commercial and industrial use.
• Electricity — residential supply by distributors (Enel, Eletrobras, CPFL, Cemig, Equatorial, Energisa, Light, Neoenergia, Copel, EDP).
• Treated water and sewage — supply by sanitation utilities (Sabesp, Cedae, Copasa, Sanepar, Embasa, Caesb, BRK Ambiental, Iguá Saneamento).
• Piped natural gas — supply by distributors (Comgás, Naturgy, Cegás, Compagas, MSGás).
• Telecommunications services — voice and data offered to the final consumer by operators (Vivo, Claro, TIM, Algar, Sky, Brisanet).

On these operations, the refund is 100% of the CBS levied and 20% of the IBS levied, subject to consumer eligibility. The asymmetric treatment between CBS (100%) and IBS (20%) stems from the federative composition of the IBS — states and municipalities share the revenue and the original design preserved a subnational revenue share on these operations.

All other goods and services — refund of 20% and 20%

For all other operations with taxed goods and services not in the essential list, the refund is 20% of the CBS and 20% of the IBS. The general rule reaches foods not covered by the Annex I zero rate, clothing, appliances, furniture, footwear, hygiene products not covered by a zero rate, and any other taxed goods and services consumed by eligible families. The refund applies only to tax actually collected — operations already exempt, zero-rated or immune generate no cashback (there is no tax to refund).

Operations excluded from cashback

Some operations are expressly excluded from the mechanism: goods and services subject to the Selective Tax (cigarettes, alcoholic beverages, sugary drinks, polluting vehicles, gaming and betting); zero-rated operations (already relieved); operations under the simplified taxation of the MEI or Simples Nacional, as specifically provided by the Complementary Law; imports for personal use. The design of art. 118 preserves distributive coherence — it makes no sense to refund CBS/IBS on cigarettes (subject to the Selective Tax precisely for the extra-fiscal purpose of discouragement).

Comparison by composition of family spending

To understand the distributive impact, consider an average low-income CadÚnico family with monthly spending of about R$ 2,000 — composed, in a typical proportion, of R$ 800 on food (part in the basic basket with a zero rate, part in other foods with 20% cashback on CBS+IBS), R$ 200 on the electricity bill (100% CBS + 20% IBS cashback), R$ 100 on the water bill (same treatment), R$ 120 on cooking gas (P13 cylinder, same treatment), R$ 150 on mobile telephony (same treatment), and R$ 630 on other goods and services (clothing, transport, hygiene, leisure — 20% and 20% cashback). Modeling the actual impact depends on the specific composition of each family profile.

Operation — Federal Revenue Service, IBS Steering Committee and timeline

Administrative split — CBS (Federal Revenue) and IBS (Steering Committee)

Arts. 114 and 115 of LC 214/2025 divided cashback administration according to the federative nature of each tax. The CBS refund — a federal tax — is managed by the Special Secretariat of the Federal Revenue Service of Brazil. The IBS refund — a shared-competence tax — is managed by the IBS Steering Committee, created by LC 227/2026 and composed of representatives of the States, the Federal District and the Municipalities. The cluster dedicated to the IBS Steering Committee goes deeper into the institutional structure of the body.

Capturing the operation and identifying the consumer

The mechanics require the taxed operation to be linked to the CPF of the final beneficiary consumer at the moment the tax document is issued. For utilities (energy, water, piped gas, telecommunications), the link is natural — the CPF already appears on the bill paid monthly by the holder of the consumer unit. For LPG-cylinder retail, capturing the CPF is a new operational challenge, demanding adaptation by resellers and adjustment of the electronic tax document (NF-e, NFC-e). For general retail of other goods and services, including the CPF on the receipt is a consolidated practice through the “Nota Premiada”/“Nota Cidadã” programs in several states, which can be leveraged structurally.

Monthly assessment and transfer deadline

Cashback assessment is monthly. Once the eligible operations linked to the beneficiary’s CPF during the reference month are identified, the federal system computes the refund amount under the art. 118 percentages. The transfer to the beneficiary occurs within a total of 25 days after assessment: 15 days to send the funds to the responsible financial agent and a further 10 days to credit the account linked to the CPF of the CadÚnico head of family. Operation follows a logic analogous to that of federal social-program transfers, predominantly using Caixa Econômica Federal and Banco do Brasil as financial agents.

Timeline — CBS from Jan 2027, IBS from Jan 2029

The cashback rollout follows the general Reform calendar: the CBS refund starts in January 2027, simultaneously with the full entry of the tax replacing PIS and Cofins; the IBS refund starts in January 2029, during the transition phase with the gradual rise of the tax. The full calendar is detailed in the Reform transition period cluster. Affected companies (utilities, telecoms, retail) must have systems and processes ready by December 2026 for the CBS start — a gap of about seven months from this date.

Coordination with other policies — Social Tariff, Auxílio Gás

Cashback dialogues with already consolidated tariff and social policies — the Electricity Social Tariff (regulated by ANEEL), the Sanitation Social Tariff at some state utilities, and the Auxílio Gás dos Brasileiros (a specific Federal Government program). Operational coordination between these programs and the cashback is a governance element that avoids duplication and amplifies the distributive effect. For utilities, integrating the tariff and tax systems is a relevant technical challenge.

Practical impacts for utilities, telecoms and retail

Electricity distributors

Electricity distributors face the largest volume of operations eligible for the increased cashback (100% CBS + 20% IBS). The sector already operates with detailed consumer identification (consumer-unit registry linked to a CPF), with tariff segmentation by consumption class (a low-income tier already benefits part of the CadÚnico public via the Social Tariff) and with robust billing systems. Integration with the federal transfer infrastructure demands adaptation of ERPs and commercial systems — needed to identify eligible operations, compute the effective tax and send structured data to the Federal Revenue Service and the IBS Steering Committee. Players such as Enel Distribuição, Equatorial Energia, Neoenergia, CPFL, EDP, Cemig and Eletrobras Distribuição must structure an adaptation project with a tight deadline for January 2027.

Sanitation utilities

Sanitation utilities (Sabesp, Cedae, Copasa, Sanepar, Embasa, Caesb, private concessionaires such as BRK Ambiental and Iguá) face a similar challenge. Identifying the consumer by CPF is already a consolidated practice in part of the base; the technical adaptation concentrates on segregating eligible-revenue accounting, identifying operations with CadÚnico beneficiaries and integrating with the federal infrastructure. Because sanitation operates with regulated tariffs — overseen by the National Water and Basic Sanitation Agency (ANA) and state agencies — there is an additional regulatory dimension to implementation.

Piped-gas distributors

State piped-gas distributors (Comgás in São Paulo, Naturgy in Rio de Janeiro, Cegás in Ceará, MSGás in Mato Grosso do Sul, among others) have a smaller residential consumer base than energy and water, but the treatment is equivalent. Sector regulation is state-level, overseen by the respective State Regulatory Agencies. Tax integration with the cashback regime requires adapting commercial systems and the billing operation.

Telecom operators

Mobile and fixed telephony, broadband and pay-TV operators (Vivo, Claro, TIM, Algar, Sky, Brisanet, Oi, Sercomtel) face added complexity: the consumer base is massive, there is a multiplicity of products (prepaid, postpaid, fixed, broadband, bundles), there are subsegments such as the social line, and there is intermediation by resellers (especially for prepaid SIMs). Consistently capturing the CPF — particularly in prepaid, where the historical link was faulty — is an operational challenge. Regulation by Anatel imposes additional governance requirements.

LPG-cylinder (P13) retail

The P13 LPG-cylinder resale segment — distributed by authorized resellers of the distributors (Ultragaz, Liquigás, Copagaz, Supergasbras, Servgás, Nacional Gás) — is the most operationally sensitive case. The direct-to-consumer sales model, often in small-value transactions and without systematic CPF capture, is incompatible with the logic of identifying the beneficiary. Operational regulation of the cashback for the segment will require substantive adaptation — possibly via a specific electronic tax document (NFC-e or a variant), with compulsory CPF capture, or via direct integration with the Auxílio Gás system. The final design is still under regulatory construction.

General retail — supermarkets, pharmacies, clothing

For general retail, the 20% cashback on CBS and IBS applies to all taxed goods and services — foods not covered by the basic basket, clothing, appliances, footwear, hygiene products. Capturing the CPF on the receipt is already a consolidated practice via state programs (“Nota Premiada Goiana”, “Nota Carioca”, “Nota Paulista”, etc.), easing the transition. Chains such as Carrefour, Assaí, Atacadão, GPA, Pão de Açúcar, Casas Bahia, Magalu, Renner and Riachuelo face moderate systemic adjustment, partly leveraging the existing infrastructure. For a dedicated sector analysis, see the cluster on retail and e-commerce.

Sensitive points, controversies and foreseeable litigation

CPF capture and the information burden

The most sensitive operational point is responsibility for capturing the final consumer’s CPF. Operational regulation will have to define whether capture is the supplier’s exclusive burden, whether the consumer has a duty to inform, and how to treat operations where the CPF was not captured for a technical reason. Consolidated case law on tax liability — including the STJ’s understanding of the limits of the information duty placed on the supplier — will be a reference for building criteria. An excessive transfer of operational burden to the supplier could be challenged via a preventive writ of mandamus.

Composition of the cashback base and case law on revenue

LC 214/2025 establishes that cashback applies to tax actually collected. The composition of the CBS and IBS tax base — a question prior to the cashback — follows the general logic of the dual VAT. The consolidated STF case law in General Repercussion Theme 69 (RE 574,706, reporting Justice Cármen Lúcia, Full Court, decided 03/15/2017) — exclusion of the ICMS from the PIS/Cofins base — and its modulating rulings is a relevant interpretive reference for building the concept of revenue applicable to the new regime. In parallel, STF Theme 1,125 (RE 1,187,264, reporting Justice Marco Aurélio, opinion-drafting Justice Alexandre de Moraes, Full Court, decided 02/24/2021) — which set the thesis on excluding the ICMS-ST from the PIS/Cofins base when the substituted party is the de facto taxpayer — completes the paradigm on base composition in chains with tax substitution, relevant to the distributors’ regime. Building the CBS/IBS base on utilities, telecoms and LPG — especially the treatment of cross-subsidies, tariff discounts and the social tariff — may generate litigation, and the correct definition of the base directly affects the amount eligible for cashback.

The beneficiary’s subjective right and standing

Cashback is a subjective right of the beneficiary enrolled in CadÚnico — an understanding that flows from the constitutional wording of art. 158 of the Constitution. In the event of non-transfer, an underpayment or undue termination, the beneficiary has standing to challenge it in court. Binding Precedent 28 of the STF (approved 02/17/2010, based on RE 388,359 and RE 389,383, reporting Justice Marco Aurélio) — which removes the requirement of a prior deposit as a condition for admitting a judicial action in tax matters — preserves full access to the courts. In addition, review of the constitutionality of the Reform architecture itself and of the cashback mechanism is the subject of ADI 7,633, filed in 2024 before the STF, which discusses aspects of the general design of EC 132/2023 and LC 214/2025. Case law on standing to challenge distributive policies — including class actions led by the Public Defender’s Office and the Public Prosecutor’s Office — builds an additional backdrop for future litigation. Companies should anticipate regulatory and reputational risk tied to the correct operation of the mechanism.

Operations with Simples Nacional and MEI

The treatment of operations with suppliers opting for Simples Nacional or the MEI — particularly relevant in the capillary retail of food, clothing and LPG — is a sensitive point. Operations by Simples opters have their own tax regime, with CBS and IBS embedded in the unified rate. Operational regulation must clarify whether these operations generate cashback for the eligible consumer and how the assessment is made. The question directly impacts millions of micro-entrepreneurs and an important share of the capillarity of low-income retail.

Defensive action and preventive structuring

For affected utilities, telecoms and large retailers, integrating preventive adaptation with litigation strategy is an essential part of the program. Building a scenario matrix, structuring a defense via a preventive writ of mandamus when needed, and integrating tax governance with regulatory governance sustain the company’s position. The cluster on the writ of mandamus details the procedural instrument most relevant to preventive matters.

How TaxUp acts in structuring the CBS/IBS cashback

Exposure diagnosis and impact estimate

The work begins by sizing the company’s exposure to the cashback: the percentage of the customer base enrolled in CadÚnico, the volume of eligible operations (essential or other), the composition of the effective tax (CBS, IBS), and the applicable implementation deadline (CBS Jan 2027, IBS Jan 2029). The impact estimate considers the effect on the cash flow of tax collected versus refunded, commercial-policy adjustments, opportunities to communicate with the consumer, and the need for technological adaptation.

Adaptation of ERPs, commercial systems and the tax document

Technical coordination of the project to adapt management, billing and electronic-tax-document systems — including systematic capture of the consumer’s CPF, segregation of eligible operations, integration with the federal beneficiary-identification infrastructure, and computation and transmission of structured data to the Federal Revenue Service and the IBS Steering Committee. Integration with the Reform NF-e (NT 2025.002) and the new layouts is a critical step.

Integrated regulatory governance

For regulated utilities (ANEEL for energy, ANA for sanitation, state agencies for piped gas, Anatel for telecommunications), articulation between tax adaptation and regulatory governance — operation manuals, consumer communication, accountability to the agency. The coordination avoids conflict between the tax obligation and the regulatory obligation, and grounds a defense in any inspection or dispute.

Preventive and strategic litigation

When the operational design of the cashback is challenged by beneficiary consumers, by federative entities or by the tax administration, conduct of a defense via a writ of mandamus, ordinary action or defense before the CARF. Integration with the general discipline of recovery of tax credits allows capturing opportunities to reimburse undue payments during the implementation phase.