How rollover is calculated for EUR/CAD

Direct answer

Rollover (also called financing or swap) for EUR/CAD is typically calculated by comparing the interest rates of the two currencies, then applying that difference to the position direction (long vs short) and scaling it by the trade size and the contract’s rollover convention. The exact numbers depend on inputs like reference interest rates, the day-count and spot/settlement convention, and any provider-specific adjustments.

Because different providers can use different reference rates and conventions, you can’t verify rollover for EUR/CAD from the currency names alone—you need the provider’s published rollover methodology and the exact assumptions it uses.

Mechanism and definition

What rollover means

In forex, a position is economically treated as being rolled from one settlement date to the next. Since currencies carry different interest rates, the “carry” between them is reflected in rollover.

A key point is direction: for EUR/CAD, holding a long position generally earns financing related to the EUR leg and pays financing related to the CAD leg; holding a short position reverses which leg you receive and which leg you pay. So the sign of the rollover is tied to whether you are long or short EUR/CAD, not just the pair.

Core inputs usually required

A provider’s rollover formula is often built from these components:

1. Reference interest rates for each currency (e.g., a money-market benchmark).
2. A conversion to a daily rate using the provider’s day-count convention (how to translate annual rates into per-day amounts).
3. Position sizing and contract units (how the notional is converted into the account currency and how pips/lot sizes map to money).
4. Rollover timing and settlement convention, including how “triple swap” is handled around specific calendar days.
5. Provider adjustments, such as spreads over the reference rates, internal funding considerations, or other rule-based modifiers described in documentation.

How triple-swap conventions work (conceptually)

Many systems apply an extra day’s financing on certain days because of settlement carry mechanics through a non-settling period (commonly linked to weekends). Instead of changing the interest-rate differential, triple-swap typically multiplies the number of days charged or credited for rollover on those calendar boundaries.

A simple checkable example (with explicit assumptions)

Assume a provider uses a basic model:

• You hold long EUR/CAD.
• Reference annual interest rates are constant for the calculation: EUR earns and CAD pays (exact references are provider-defined).
• The provider converts annual rates to daily using 365 days.
• No provider adjustments beyond the interest differential.

Then the daily interest differential (in rate terms) is roughly:

• daily_diff = (EUR_rate − CAD_rate) / 365

Rollover value in money terms is then proportional to:

• notional exposure (how much EUR is effectively being financed), scaled by the provider’s contract definition,
• and direction (long vs short).

If the interest differential is positive, long positions receive more than they pay; if negative, the sign flips.

This “simple model” is meant for independent reasonableness checks, not as a substitute for your provider’s official rollover methodology.

Limitations and risks (what can go wrong)

1. You may be using the wrong day-count or daily conversion. Providers can differ on whether they use 360 vs 365 style conventions and how they map annual benchmarks to daily financing.
2. Cut-off time matters. Rollover is applied at a specific system time. If you calculate based on calendar dates without the provider’s cut-off definition, you may be off by a day.
3. Triple swap rules can change outcomes. If you expect “one day per day” but the provider applies an extra day on certain boundaries, your computed rollover will not match.
4. Provider adjustments can override the pure interest differential. Many providers apply additional financing components beyond the raw reference-rate difference; without their published adjustments, you can’t reproduce the final number.
5. Currency conversion into account currency adds another layer. Even if the financing is computed on the traded legs, the credited/debited amount often needs conversion using a valuation convention, which can introduce mismatch if you use different rates.

Verification and next question

To independently verify rollover for EUR/CAD, do these checks:

• Find the provider’s published rollover (swap/financing) calculation rules for EUR/CAD.