Brazil launched the practical operational test phase of its comprehensive tax reform on Jan. 1, 2026 [1].
This transition period allows the government and private sector to synchronize digital systems before the new tax structure becomes financially binding. By simulating the new environment, the Ministry of Finance aims to prevent systemic failures that could disrupt national commerce during the full rollout.
Under this "assisted calculation" phase, electronic invoices have begun to include the new Contribution on Goods and Services (CBS) and the Tax on Goods and Services (IBS) [1], [2]. However, these additions currently carry no real financial impact, meaning the actual tax burden on businesses and consumers remains unchanged during the trial [1], [3].
The government said the phase is necessary to calibrate systems and allow companies to adapt their accounting software. This ensures that the eventual transition to the new regime is smooth and does not create immediate liquidity crises for the private sector [1], [2].
Despite the controlled nature of the test, some reports indicate potential volatility regarding tax credits. Data suggests that 66.2% of invoices could have their credits at risk due to the complexities of the reform [2]. This highlights the technical challenges involved in migrating from the old system to the new dual-VAT model.
While the practical tests began on Jan. 1, 2026 [1], the broader implementation strategy involves a phased approach. Some reports indicate the full effective start of the reform is slated for Jan. 1, 2027, following the conclusion of these operational simulations [2].
“Electronic invoices have begun to include the new CBS and IBS taxes”
The operational test phase serves as a critical buffer for one of the most complex fiscal overhauls in Brazil's history. By decoupling the technical implementation of electronic invoicing from the actual collection of revenue, the government is attempting to mitigate the risk of widespread corporate accounting errors. However, the reported risk to over 60% of invoice credits suggests that the transition to the CBS and IBS models may still face significant friction before the 2027 full launch.
