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BOE-A-2026-5319 ·6 March 2026 ·Act critical
Administrative

Businesses and individuals: 3-month window to update official exchange rates or face deviation risks

The Bank of Spain Resolution publishes the Euro exchange rates for 5 March 2026, established by the ECB, which now have official effect (Art. 36 of Law 46/1998). These rates supersede previous ones and must be used for financial transactions, contracts, and tax returns. This change affects all users of foreign currencies in Spain, particularly regarding international payments, invoicing, and tax calculations.

In 2 key points

  1. Official exchange rates are updated on 5 March 2026 and must be used in financial transactions (art. 36 Ley 46/1998)
  2. The Bank of Spain publishes ECB rates as official for use in contracts and tax declarations (Resolución de 5 de marzo de 2026)

How it affects those involved

Businesses and individuals making international payments or invoicing in foreign currencies must update their calculations with the new official rates from 5 March. Tax authorities and financial institutions must apply these rates in their review and control processes. Financial advisors and accountants should review their calculations and adjust reports to prevent errors in filings. The risk of discrepancy increases if previous rates are used due to a failure to update in time.

Lifecycle

2026-03-06PublishedPublished in the BOE
2026-03-05Into forceComes into force (Resolución de 5 de marzo de 2026)
Official text Based on BOE data (boe.es). Information, not advice.

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This analysis is informational only and does not constitute legal advice or create a client-adviser relationship. BM Consulting.
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