Key data
| Regulation | Resolution of September 18, 2026, from the Bank of Spain, publishing the euro exchange rates for September 18, 2026 |
|---|---|
| BOE Publication | September 19, 2026 |
| Effective date | September 18, 2026 |
| Legal basis | Article 36 of Law 46/1998, of December 17, on the Introduction of the Euro |
| Affected parties | Companies and individuals with operations in foreign currencies or international trade |
| Category | Regulatory Changes |
| Year | 2026 |
| EUR/USD | 1.1460 US dollars |
| EUR/GBP | 0.8588 British pounds |
| EUR/JPY | 180.94 Japanese yen |
If your company invoices, purchases or has contracts denominated in dollars, pounds or yen, the rate you must use for September 18, 2026 is already set. The Bank of Spain has published in the BOE, in accordance with article 36 of Law 46/1998, the official euro exchange rates established by the European Central Bank for that date. They are not indicative rates: they have official status and are the legal reference against third parties and administrations.
What does this regulation establish?
The Bank of Spain publishes daily, by resolution in the BOE, the euro exchange rates that the ECB has set for each business day. This publication is not a minor bureaucratic procedure: it grants official legal validity to those rates against any third party or public administration.
For September 18, 2026, the official rates are as follows:
| Currency pair | Official rate (18/09/2026) | Interpretation |
|---|---|---|
| EUR / USD | 1.1460 | 1 euro equals 1.1460 US dollars |
| EUR / GBP | 0.8588 | 1 euro equals 0.8588 British pounds |
| EUR / JPY | 180.94 | 1 euro equals 180.94 Japanese yen |
These values are the legal reference for contracts, customs valuations and commercial operations whose accrual or settlement date is September 18, 2026.
Economic and operational impact
The use of incorrect exchange rates in accounting or tax returns can generate valuation differences that the Tax Agency or Customs can question. Using the official rate of the day eliminates that risk.
From an operational perspective, these rates affect three main areas:
- Accounting: Transactions in USD, GBP or JPY on September 18 must be recorded at the official rate of that day. The 1.1460 USD/EUR rate means that an invoice for 100,000 USD equals 87,260.03 euros in the books.
- Customs: Customs valuations of goods imported or exported that day use these rates as a reference to calculate the customs value in euros.
- Commercial contracts: If a contract refers to "the official ECB rate" or "the rate published by the Bank of Spain", the binding value for September 18 is that of this resolution.
Who does it affect?
- Export and import companies with collections or payments in USD, GBP or JPY
- Accounting and finance departments that must close entries on September 18 in foreign currencies
- Foreign trade operators who submit customs declarations dated September 18, 2026
- Tax advisors and auditors who validate foreign currency operations for that date
- CFOs and financial directors with exposure to exchange rate risk in dollars, pounds or yen
- Companies with international contracts that reference the official ECB or Bank of Spain rate
- Individuals with relevant foreign currency operations (real estate sales, international inheritances, etc.)
Practical example
A Spanish company imports electronic components from Japan and receives an invoice for 18,094,000 yen with an accrual date of September 18, 2026.
Applying the official EUR/JPY rate of 180.94:
- 18,094,000 JPY ÷ 180.94 = 100,000.00 euros
This is the amount that must be recorded in accounting and declared for tax purposes. If a different rate had been used—for example, that of a commercial bank—and the difference was material, the Tax Agency could require the correction and, if applicable, apply late payment interest on the difference.
The same principle applies to dollar operations: an export collected for 114,600 USD on September 18 equals 100,000 euros at the official rate of 1.1460 USD/EUR.
What should companies do now?
- Identify all transactions in USD, GBP or JPY on September 18, 2026 and ensure that the rate applied in accounting matches the official values: 1.1460, 0.8588 and 180.94 respectively.
- Update customs declarations for that day if still in process, using the official rates published in the BOE.
- Review active contracts that reference the official ECB or Bank of Spain rate to verify if September 18 is a settlement date or contractual reference.
- Archive this resolution as documentary support for the day's accounting conversions, in case of possible tax audits or audits.
- Communicate to the accounting team the three official rates so they apply them in the day's closing entries without resorting to unofficial sources.
Frequently asked questions
What is the official euro exchange rate against the dollar on September 18, 2026?
The official EUR/USD rate set by the ECB and published by the Bank of Spain for September 18, 2026 is 1.1460 dollars per euro. This value has full legal validity after its publication in the BOE on September 19, 2026.
What euro-pound exchange rate applies for contracts and accounting on September 18, 2026?
The official EUR/GBP rate for September 18, 2026 is 0.8588 British pounds per euro. It is the value that companies and advisors must use for accounting records, tax returns and contracts whose reference date is that day.
How many yen equals one euro on September 18, 2026?
According to the Bank of Spain resolution published in the BOE, 1 euro equals 180.94 Japanese yen on September 18, 2026. This is the official rate for customs valuations and commercial operations with Japan for that date.
Are these exchange rates mandatory for my company's accounting?
Yes. Under article 36 of Law 46/1998, these rates have the status of official exchange rates and are the legal reference for contracts, customs valuations and commercial operations. Using a different rate in accounting records or returns can generate discrepancies with the Tax Agency or Customs.
Where can I consult the official euro exchange rates published by the Bank of Spain?
The rates are published daily in the Official State Gazette (BOE) by resolution of the Bank of Spain. For September 18, 2026, the official source is the resolution with reference BOE-A-2026-19518.
Official source
Consult complete regulation in official source
Disclaimer: This article is for informational purposes only and does not constitute legal advice. For specific decisions, consult a qualified professional. Source: https://www.boe.es/diario_boe/txt.php?id=BOE-A-2026-19518
