Portugal's Tax and Customs Authority (Autoridade Tributária e Aduaneira - AT) has extended its corporate tax filing deadline for a second time, giving businesses until June 30, 2026 to submit their 2025 income declarations without penalty—a move reflecting widespread compliance challenges that have left more than 100,000 declarations still outstanding.
Why This Matters
• Extended deadline: Corporate tax filings (Modelo 22) for the 2025 tax year must now be submitted by June 30, 2026, without fines or interest charges.
• Widespread delays: Only 81% of the expected declarations had been filed by mid-June, compared to the complete submission period in the previous year, representing a shortfall that affects tens of thousands of companies.
• No exceptions needed: The extension applies to all entities subject to corporate income tax (IRC) whose reporting period aligns with the calendar year, regardless of whether they were directly impacted by recent storms.
• Leadership transition ahead: A new director will take charge of the Portugal Tax and Customs Authority (AT) on August 1, 2026, with digital modernization and anti-evasion enforcement as top priorities.
What Triggered the Second Extension
Secretary of State for Tax Affairs Cláudia Reis Duarte initially pushed the filing deadline from May 31 to June 19, citing exceptional circumstances caused by a succession of severe storms that disrupted year-end accounting processes across the country. That first extension was meant to accommodate companies struggling to close their books amid weather-related operational chaos.
But by Tuesday of this week, submissions remained far below normal levels. The government noted that only 81% of the expected declarations had been filed by mid-June, compared to the complete submission period in the previous year—a gap translating to more than 100,000 missing returns. With the original extended deadline just days away, the Portugal Ministry of Finance opted for a second reprieve.
Officials framed the move as a quality-over-speed decision. According to the dispatch from the Secretary of State's office, an additional extension "contributes to ensuring greater accuracy in the fulfillment of tax obligations, reducing the risk of material errors and the need for subsequent corrections." The ministry argued that the measure benefits both taxpayers and the administrative efficiency of the Portugal Tax and Customs Authority (AT), describing it as proportional, exceptional, and aligned with objectives of legal certainty and simplified taxpayer relations.
What This Means for Residents
For business owners and finance directors, the extension buys breathing room—but the clock is still ticking. Companies whose accounting periods match the calendar year (January-December 2025) must file their Modelo 22 declaration and settle any outstanding corporate tax liability by June 30, 2026. Miss that window, and the penalties kick in.
Under Portuguese tax law, late or missing corporate income declarations can trigger fines ranging from €300 to €3,750 for procedural non-compliance. If the return contains omissions or inaccuracies that result in unpaid tax, penalties escalate sharply, reaching between €750 and €22,500. When tax is owed, additional surcharges of 30% to 100% of the outstanding amount may apply, alongside accruing interest on late payments.
Beyond monetary penalties, late filing can also result in the loss of fiscal benefits, such as deductions or credits tied to timely compliance. In severe cases, the Portugal Tax and Customs Authority may initiate coercive collection proceedings, including asset seizures. Businesses that regularize their situation within 30 days of the deadline—before formal audit or enforcement action begins—can sometimes secure reduced fines, but that window is narrow.
For foreign investors and multinational subsidiaries operating in Portugal, the extension offers a practical buffer amid a historically challenging reporting season. However, it also underscores the importance of maintaining robust local accounting support, given the cascading consequences of missed deadlines in the Portuguese fiscal system.
New Leadership at the Tax Authority
The filing extension comes as the Portugal Tax and Customs Authority prepares for a leadership transition. Mário Campos, currently Deputy Director-General responsible for information systems, will succeed outgoing Director-General Helena Borges on August 1, 2026. Campos has coordinated the AT's digital infrastructure since March 2016, overseeing nearly the entire tenure of Borges, who has led the agency since March 2015.
The Portugal Finance Ministry announced Campos's appointment last week, highlighting his background in information technology and systems management. A 1997 graduate in Electrical Engineering and Computing from Instituto Superior Técnico, Campos spent a decade at Caixa Geral de Depósitos before joining the tax authority and previously worked at Deloitte and Andersen Consulting (now Accenture).
His five-year mandate will be guided by a mission letter drafted by the government in January, which outlines four strategic priorities. The first focuses on boosting voluntary compliance through integrated communication channels and tougher controls on tax evasion. The second aims to strengthen trust and transparency, using communication as a core tool to rebuild public confidence. The third objective—digital transformation—sits squarely in Campos's wheelhouse, calling for enhanced data security, innovative service delivery, and intelligent data management.
The fourth goal emphasizes organizational resilience, including skills renewal, employee retention, and flexible work models. While the government has not publicly ranked these objectives, the emphasis on digital infrastructure and evasion control signals a dual push toward modernization and enforcement.
Windfall Tax Still in the Pipeline
Separately, Prime Minister Luís Montenegro confirmed this week that his government has not abandoned plans to impose a tax on extraordinary profits earned by energy companies, despite delays that have stretched beyond a month since the initial announcement. During a parliamentary debate ahead of this week's European Council meeting, Montenegro told Left Bloc deputy Fabian Figueiredo that the draft legislation "is being prepared by the government and will naturally reach the Assembly of the Republic."
Finance Minister Joaquim Miranda Sarmento first announced the windfall tax in early May 2026, citing the need to mirror measures Portugal implemented in 2022 during an earlier fuel price crisis. Economy Minister Manuel Castro Almeida later confirmed the policy was in development but added a caveat: if the conflict in Iran ends, the justification for taxing excess profits would evaporate.
Portugal previously levied a temporary solidarity contribution on energy sector windfall profits for the 2022 and 2023 fiscal years, applying a minimum rate of 33% to profits exceeding 120% of the 2018–2022 average. The government has signaled the new version would be "well-designed and well-targeted" to avoid deterring investment, learning from the 2022 experience.
Montenegro framed the measure within a broader push for European fiscal harmonization, arguing that aligned tax regimes are essential for a fair economic policy that does not privilege certain member states over others within the single market. "To curb the rise in the cost of living, we need profitable, competitive companies, and for that, we need appropriate and fair financing regimes," he said.
Broader Fiscal Context
The dual developments—filing extensions and windfall tax proposals—illustrate the balancing act facing Portugal's fiscal authorities. On one hand, the government is extending compliance grace periods to accommodate operational realities and avoid penalizing businesses caught in extraordinary circumstances. On the other, it is signaling a tougher stance on sectors perceived to be capitalizing on crisis-driven price spikes.
For companies operating in Portugal, the immediate priority is clear: file by June 30, 2026 or face a penalty regime that can quickly compound. For energy sector players, the horizon is less certain, with the timing and structure of the windfall levy still under wraps. Either way, the message from Lisbon is that fiscal discipline—and fiscal scrutiny—remain central to the government's economic agenda as the country navigates both domestic disruptions and broader European policy coordination.
