Tax law practice in Madrid
Madrid · Company · Wealth · International

Tax law practice in Madrid specializing in tax law

We advise companies, family groups, executives, and investors on corporate taxation, audits, tax planning, foreign residents, and cross-border transactions with both national and international components.

Corporate taxation
Audits and regularization
Wealth and foreign residents
International taxation
What we resolve

Strategic, clear, and well-executed taxation

We intervene in tax decisions that affect profitability, legal certainty, and client planning.

Corporate tax management

We support the company's ordinary tax operations and decisions with significant tax impact.

  • Corporate income tax, VAT, and withholding tax
  • Tax ruling requests
  • Coordination with finance leadership

Audits and examinations

We defend the client when the tax authorities review operations or adjust tax positions.

  • Notices and requests
  • Audit findings and reports
  • Appeals and challenges

Operations and restructuring

We assess the tax impact of reorganizations, acquisitions, and sensitive corporate decisions.

  • Restructurings
  • Tax impact of operations
  • Contingency prevention

Foreign residents and international mobility

We advise individuals relocating to Spain who need appropriate tax planning.

  • Special foreign resident regime
  • Tax residency status
  • Executives and professionals

Wealth and personal planning

We structure wealth decisions with legal, tax, and succession perspective.

  • Real estate and wealth
  • Succession and asset transfer
  • Organized optimization

Cryptocurrencies and digital assets

We analyze tax treatment of digital asset transactions and reporting obligations.

  • Gains and losses
  • Information returns
  • Tax risk
How we work

Our process in 4 steps

Each matter follows an organized process so legal intervention is useful from day one.

1

Case review

We analyze tax documentation, prior filings, and the taxpayer's position to understand the matter.

2

Diagnosis and strategy

We identify tax risks, defense options, and present clear scenarios with timeline and costs.

3

Documentary execution

We prepare appeals, challenges, tax rulings, or tax planning that the matter requires.

4

Follow-up and closure

We manage deadlines, respond to notices, and support you until final resolution of the matter.

Frequently asked questions

Common questions about tax law

The accountant manages periodic obligations. A tax lawyer intervenes when there is complex wealth planning, tax audits, penalties, corporate reorganizations, or disputes with the tax authority. If there is economic or personal risk involved, you need a lawyer.
Do not sign anything without legal advice. You have the right to representation, to review requested documentation, and to file objections. We protect your position from day one of notification to minimize impact.
Yes. First through administrative remedies (reconsideration or economic-administrative claim), then through court. Deadlines are strict—generally one month—so speed is essential.
The foreign resident regime allows you to pay a fixed 24% rate on income up to 600,000 euros for six years. It is critical to apply it correctly from year one and meet prior residency requirements.
It depends on the matter: recent personal or corporate tax filings, any notices from the tax authority, deeds of relevant assets, and a description of the issue. We work with what is available for initial guidance.
First contact

Tell us about your situation

Share your information and a brief explanation. The firm will review your consultation and advise you on the best approach.

You can also share information in writing and the firm will advise you on the best approach.

The consultation is registered with the firm and sent to info@castellanalawfirm.com.

Related articles

Useful analysis on tax matters and tax planning

These resources can serve as a starting point for common tax issues in business and personal finance.

Foreign Residents

Special Foreign Resident Regime 2026: Taxation in Spain

Relevant guidance for professionals, executives, and investors relocating to Spain.

Digital Taxation

Taxation of Digital Assets in Spain 2026 | Information Returns

Practical analysis of tax obligations and criteria for digital assets.