2025 Tax Campaign: deadlines, forms and how to file income tax and wealth tax

Key data

If you need to file income tax or wealth tax for the 2025 tax year, this regulation sets the rules: which form to use, when to file it and how to do it. The Order HAC/277/2026, of March 25, published in the BOE on March 27, 2026, is the regulation governing the entire 2025 tax campaign. Ignoring its deadlines has a direct cost: surcharges and possible penalties.

What does this regulation establish?

Order HAC/277/2026 approves the official declaration forms for income tax and wealth tax for the 2025 tax year. Additionally, it determines three key elements for any taxpayer:

• The officially approved declaration forms for the 2025 tax year, for both income tax and wealth tax.
• The place, form and deadlines for filing both declarations, which are the dates that set the mandatory tax calendar for the campaign.
• The procedures for the income tax draft: how to obtain it, modify it, confirm it and file it through electronic means.
• The general conditions for electronic filing, which is the primary channel and practically mandatory for most taxpayers.

The regulation also governs the valid channels for electronic filing, which directly affects self-employed workers, business owners and tax advisors who manage third-party declarations.

Economic and operational impact

The direct impact of this regulation is not a new tax or a rate increase: it is the formal opening of the campaign with its binding deadlines. Failing to meet them has concrete economic consequences.

For tax advisors and accounting firms managing client portfolios, this regulation marks the beginning of the period of maximum operational burden. Electronic filing as a practically mandatory channel means having operational systems for digital signature and access to the electronic headquarters of the Tax Agency.

For taxpayers with high net worth, the regulation also activates the obligation to file wealth tax for the 2025 tax year, with its own deadlines and approved form.

Who does it affect?

• Individuals required to file income tax for the 2025 tax year, including employees who exceed the filing thresholds, self-employed workers and individual business owners.
• Taxpayers with high net worth required to file wealth tax for the 2025 tax year.
• Self-employed workers and business owners who must know the key dates of the campaign and the valid channels for electronic filing.
• Tax advisors, accounting firms and professional offices that file declarations on behalf of third parties and must adapt their operations to the deadlines and channels set.
• CFOs and financial directors of companies whose partners, administrators or executives are required to file income tax or wealth tax.

Practical example

A self-employed worker with economic activity in 2025 must file their income tax declaration within the deadlines set by Order HAC/277/2026. If their tax advisor does not have updated electronic filing systems or is unaware of the specific deadlines for this campaign, they may incur a late filing that generates automatic surcharges under the General Tax Law, with no margin for correction without cost.

Similarly, a taxpayer with high net worth who is not aware that Order HAC/277/2026 also approves the 2025 wealth tax form could omit that declaration, with the resulting risk of penalty for tax violation.

In both cases, the cost of the error is not the regulation itself, but ignorance of its deadlines and obligations.

What should companies do now?

1. Locate the exact campaign deadlines set by Order HAC/277/2026 and note them in the tax calendar. These are binding dates whose non-compliance generates surcharges.
2. Verify the obligation to file wealth tax if there are partners, administrators or executives with high net worth. The regulation also approves that form for 2025.
3. Confirm that electronic filing systems are operational: digital certificate, access to the Tax Agency's electronic headquarters and, if filing on behalf of third parties, current representation authorizations.
4. Review the 2025 income tax draft as soon as it is available through the electronic channels regulated by the regulation, and modify it if it contains incorrect or incomplete data before confirming it.
5. Coordinate with the tax advisor the campaign schedule, especially if there are income from economic activities, real estate capital income or complex patrimonial situations that require more preparation time.