How is rollover calculated for USD/SEK?

Direct answer

Rollover for USD/SEK is the net interest adjustment you receive or pay when you hold a forex position overnight. Conceptually, it comes from the interest-rate difference between USD and SEK, converted into a daily carry amount and then applied according to the broker or platform’s swap calculation conventions.

Mechanism or definition

“Rollover” (also called “swap” or “carry”) is not a single universal formula across all providers. It is an overnight cashflow adjustment that reflects two broad inputs:

1. Interest-rate differential (the carry component). Forex carry is driven by which currency has the higher short-term interest rate. If the USD interest component is higher than the SEK component (or vice versa), the theoretical carry changes sign.

2. Provider-specific adjustments (the implementation component). Even if two providers use the same underlying rates, the final rollover can differ because providers may:

• use a particular day-count convention,
• adjust for their own funding and risk costs,
• widen or modify the effective rates used in the swap.

A practical way to verify the exact calculation for your situation is to look for the provider’s published swap rate for the specific instrument and the relevant direction (long USD/short SEK vs short USD/long SEK), since that swap rate embeds the provider’s implementation choices.

What “triple swap” means

Some systems apply a triple rollover on certain roll days to account for how the market settles and when interest accrues. Instead of paying/receiving one day’s carry, the platform may apply roughly three days of carry to bridge non-business days. The exact timing depends on the provider’s convention and the instrument’s trading calendar.

Evidence or example (with explicit assumptions)

Because no live provider data is assumed here, use a simplified framework to understand structure rather than compute an exact USD/SEK number.

Assumptions for a hypothetical check

• You hold a position overnight.
• The provider has an internal swap rate per unit of notional for your instrument and direction.
• The rollover is quoted as a daily amount or as a rate that is convertible into currency cashflow using standard contract sizing.

Simplified calculation model

1. Compute or obtain the provider swap amount for one “daily” roll.
   • In practice, many platforms show this directly as a swap rate/fee per lot.
2. Apply the roll-day multiplier.
   • If the rollover day uses a triple-swap convention, multiply the one-day carry by ~3.
   • This is a convention to match non-business day accrual; it is not “guaranteed extra,” and it can still net out to a different figure depending on how rates and adjustments are handled.
3. Convert into the account currency cashflow as the platform specifies.
   • Providers differ in whether they express swap in the base currency, quote currency, or as a converted account-currency amount.

Material limitation

Even if you know the interest-rate differential, you cannot reliably infer the provider’s displayed rollover from public rates alone because provider adjustments and day-count rules can materially change the result.

Limitations and risks (and one failure mode)

• Mismatch risk: Theoretical carry based on widely available interest rates may not match the provider’s displayed rollover due to implementation differences (markup, funding assumptions, and instrument-specific conventions).
• Timing risk: Rollover depends on when your position is held through the provider’s rollover cut-off. If you close before the cut-off, the swap you expected may not apply.
• Triple-swap surprises: A triple rollover can cause larger overnight charges or credits than adjacent days. This does not remove uncertainty; it changes the timing and magnitude of the adjustment.
• Execution and costs: The rollover is often only one component. Transaction costs, spreads, commissions, and execution timing can change the total economic impact even if rollover is computed “correctly” by the provider’s rules.

Verification or next question

To independently verify the USD/SEK rollover for your exact setup, compare three items in your provider’s own documentation or instrument specifications:

1. the swap rate (or swap fee) for USD/SEK for your direction (long vs short),
2. the rollover cut-off time and which days trigger a triple swap,
3. the contract sizing / notional conversion rule used to express rollover in your account currency.

A next useful question is: what specific swap schedule and rollover cut-off does your provider apply for USD/SEK?