Question 1

Where do the exchange rates in this converter come from?

Accepted Answer

The rates are the official reference rates from the European Central Bank (ECB). The Bank of Portugal republishes these same rates through the BPstat platform, and that is where this converter gets its data — via the BPstat API. In short: the original source is the ECB, the technical channel is the Bank of Portugal, and the rates are identical to those used by all eurozone central banks.

Question 2

How often are the rates updated?

Accepted Answer

ECB reference rates are published daily, usually around 16:00 CET, on each business day. No new rates are published on weekends and holidays — the converter automatically uses the last available business day rate.

Question 3

Can I use these rates for invoicing and tax returns?

Accepted Answer

Yes, in most cases. The rates published by the ECB/BdP are the official reference rate for currency conversion in Portugal and are used for VAT, corporate tax, personal income tax and other tax obligations. The rules vary by type of transaction, so check with your accountant which rate applies to your case.

Question 4

What's the difference between these rates and commercial bank rates?

Accepted Answer

The ECB reference rates are mid-market rates, with no margin or spread. Commercial banks apply their own margins on top of these reference rates. For accounting and tax purposes the usual reference is the ECB/BdP rate, not your bank's.

Question 5

How does conversion work on days without a published rate?

Accepted Answer

When you look up a rate for a weekend or holiday, the converter automatically uses the rate from the last business day. This follows standard accounting practice.

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Frequently Asked Questions

Where do the exchange rates in this converter come from?

How often are the rates updated?

Can I use these rates for invoicing and tax returns?

What's the difference between these rates and commercial bank rates?

How does conversion work on days without a published rate?