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BOE-A-2026-5207 ·5 March 2026 ·Act critical
Administrative

Businesses and individuals: 3 months to update official exchange rates or risk discrepancies

The Bank of Spain Resolution publishes the euro exchange rates for 4 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 foreign currency users in Spain, particularly regarding international payments, invoicing, and interest rates.

In 2 key points

  1. Official exchange rates are updated every 3 months according to the ECB (art. 36 Ley 46/1998)
  2. 1 euro = 1.1649 US dollars (official rate for 4 March 2026) (cambio 1 euro = 1,1649 dólares USA)

How it affects those involved

Businesses and individuals making international payments must update their calculations with the new exchange rates to avoid errors in invoices, payments, or tax filings. Financial institutions must incorporate the new rates into their conversion systems. Financial advisors and managers should review their calculations and communicate updates to clients. The risk of discrepancies or calculation errors may lead to fines or claims if previous rates are used.

Lifecycle

2026-03-05PublishedPublished in the BOE
2026-03-04Into forceComes into force (Resolución de 4 de marzo de 2026, del Banco de España)
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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