Direct answer: what “rollover for EUR/NOK” means
Rollover (also called swap) is the interest adjustment that applies when a forex position is held over the broker’s daily cutoff time. In EUR/NOK, the rollover is driven mainly by the interest-rate difference between euro (EUR) and Norwegian krone (NOK), but the final amount you see also depends on the provider’s quote convention, any markup/fee, contract size, and the swap schedule (for example, extra cost on certain days).
Because rollover is implemented through a specific set of product terms, the most reliable way to understand “how it is calculated” on any platform is to: (1) identify the formula and conventions used by that provider, (2) extract the interest inputs they publish or reference, and (3) apply the swap schedule for the exact holding period.
Mechanics: the moving parts in a EUR/NOK rollover calculation
A practical way to model rollover is to treat it as “interest differential converted into a per-day cash adjustment.” The general ingredients are:
- Interest-rate differential (the core driver)
- EUR has its own interest reference rate (often based on a money-market benchmark).
- NOK has its own interest reference rate.
- The rollover for a long EUR position vs a short EUR position typically reflects whether EUR’s reference rate is higher or lower than NOK’s reference rate.
- Position direction
- If you hold a position that is effectively “long EUR / short NOK,” you generally earn the side with the higher reference rate, and pay the side with the lower reference rate—under the relevant conventions.
- If you reverse direction, the sign flips (you pay instead of receive, or vice versa), again depending on the provider’s implementation.
- Contract size and unit conversion Even when the underlying idea is “interest difference,” the cash result depends on the contract specifications:
- How much EUR is represented by one lot.
- How the profit/loss currency is handled in the platform’s reporting.
- Whether the swap is expressed per standard lot, per unit, or in another standardized form.
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Day-count and rate-to-period conversion Interest-rate references are annualized, so they must be converted to the time period you are holding the trade. Providers often rely on a day-count convention (for example, “days in year” logic). This matters because it can slightly change the resulting daily rollover.
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Broker/provider adjustments Many providers do not pass through the raw market differential exactly. A rollover can include:
- A markup or fee embedded into the swap rate.
- Rounding rules.
- A conversion approach that maps market rates into their own swap quoting format.
Evidence or example: reproducing the logic with explicit assumptions
Below is a verification-style example that shows the logic without using live rates. Use it as a template to replicate what a provider claims, using the specific inputs they show on their platform.
Assumptions for the example
- You hold EUR/NOK long for exactly one “swap day” per the provider’s definition.
- The provider states daily swap rates for EUR/NOK in the direction you hold (or provides the raw interest inputs they use).
- The provider also states the day-count convention (or implies a standard one).
Template model
- Step 1: Determine the sign.
- For your position direction, decide whether the interest differential implies a positive or negative adjustment.
- Step 2: Convert the annual differential into a daily amount.
- Daily interest ≈ (annual differential) × (days in holding period) / (days in year), under the provider’s day-count convention.
- Step 3: Apply contract scaling.
- Multiply by the position’s notional exposure and apply any unit conversion needed to express the cash adjustment.
- Step 4: Account for provider adjustments.
- If the platform provides a swap rate that already includes markup, treat that as the final “effective differential.” If it provides raw inputs, add the provider’s adjustment component if documented.
- Step 5: Apply the swap schedule.
- If the holding period includes a day with an expanded swap (often described as an extra charge on certain weekdays), your total rollover is larger than a plain “one day” calculation.
Material limitation / failure mode A common reason people cannot reproduce rollover is that they assume “one day = one standard swap.