What it means
Euribor is calculated from submissions by a panel of banks and published for maturities from one week to twelve months, with the one-month, three-month and six-month rates being the ones most contracts use. A borrower on a floating loan pays Euribor plus an agreed margin, so the base moves with the market while the margin reflects that specific borrower's credit risk.
It matters because it converts a general market condition into a specific monthly cost. When central bank policy tightens, Euribor rises, and every business on a Euribor-linked facility sees its interest bill increase without renegotiating anything.
In practice the rate is fixed at the start of each interest period and applied for that period only. A company on three-month Euribor knows its rate for the coming quarter on day one, which makes the exposure manageable even though the rate resets four times a year.
The market has reformed how the rate is produced. Euribor now follows a hybrid methodology anchored in actual transactions wherever they exist, rather than relying purely on banks' opinions, and it sits alongside a separate overnight benchmark used for many derivative contracts.
The nuance worth knowing is that euro interest is normally calculated on an actual/360 day count, meaning the year is treated as 360 days while actual days are counted. That convention makes the effective annual cost slightly higher than the quoted rate suggests.
In practice
Real-world examples.
Example
A logistics group with a EUR 10,000,000 revolver priced at three-month Euribor plus 1.80% pays EUR 125,000 in a quarter when the benchmark fixes at 3.20%. A 50 basis point rise at the next reset adds EUR 12,500 to the following quarter's bill.
Example
A property developer takes a euro construction loan and buys an interest rate cap struck at 4% on the Euribor component. If the benchmark goes above that level, the cap pays the difference, so the project's interest budget holds.
Example
A treasury team at a manufacturer compares a fixed-rate quote of 5.10% against three-month Euribor plus 1.80%. It splits the borrowing evenly between the two so the company is neither fully exposed to rate rises nor fully locked out of falls.
Formula
Calculation
Interest for a period = principal x (Euribor + margin) x actual days in period / 360. Suppose a company has a EUR 10,000,000 revolving facility priced at three-month Euribor plus a 1.80% margin, and at the start of the quarter three-month Euribor fixes at 3.20%. The all-in rate is 3.20% + 1.80% = 5.00%, so the annualised interest is EUR 10,000,000 x 0.05 = EUR 500,000. For a 90 day quarter, interest is EUR 500,000 x 90 / 360 = EUR 125,000. If Euribor rises to 3.70% at the next reset, the all-in rate becomes 5.50%, and the quarterly interest becomes EUR 10,000,000 x 0.055 x 90 / 360 = EUR 137,500, an increase of EUR 12,500.Case study
Seen in the real world.
The following is an illustrative, fictional example. Larchfield Logistics ran a EUR 10,000,000 revolving facility priced at three-month Euribor plus a 1.80% margin, and had budgeted interest for the year using a 3.20% benchmark, giving an all-in 5.00% and roughly EUR 500,000 of annual cost.
Two resets into the year the benchmark had moved to 3.70%, taking the all-in rate to 5.50% and lifting quarterly interest from EUR 125,000 to EUR 137,500. Across the remaining two quarters that was EUR 25,000 more than budget, which was uncomfortable but survivable for a business with EUR 4,000,000 of operating profit.
In this illustrative story the treasurer's response was to buy an interest rate cap on half the facility for a one-off premium of EUR 45,000. The board accepted the cost because it converted an open-ended exposure into a known worst case, which mattered more to them than the chance of saving money if rates fell back.
Watch out
Common mistakes.
- Quoting a loan as "Euribor plus margin" without saying which Euribor maturity applies. One-month and twelve-month rates can differ noticeably, and the choice changes both the cost and how often it resets.
- Budgeting the full year at the current fixing. The rate resets each period, so a forward view or a sensitivity range is far more useful than a single number.
- Ignoring the actual/360 day count. Counting a 365 day year against a 360 day base makes the effective annual cost higher than the headline rate implies.
Questions
People also ask.
Is Euribor the same as the European Central Bank's policy rate?
No, it is a market rate for interbank lending that follows policy closely but includes bank credit and liquidity premiums.
Can Euribor be negative?
Yes, it spent several years below zero, and many loan agreements added a clause floored at zero so the margin could not be eroded.
What is a basis point in this context?
One hundredth of a per cent, so a 50 basis point rise means the rate moved by 0.50%.
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