Introduction
The exchange rate asset class covers FX forwards, FX swaps, cross-currency swaps, and FX options. Compared to the interest rate asset class covered in Part 3, the FX methodology under SA-CCR is considerably more straightforward — there are no maturity time buckets, no multi-term correlation formula, and the hedging set aggregation collapses to a single absolute-value sum.
This article walks through the exchange rate asset class with the same level of granularity as Part 3: how to calculate the Adjusted Notional, the ADCA, and the final Hedging Set Amount, including the specific rule for trades with multiple exchanges of principal — a feature unique to FX and cross-currency products.
As with Part 3, this article stops at the Hedging Set Amount. The PFE Multiplier and the final aggregation across asset classes into total PFE are covered later in this series once all five asset classes have been built up individually.
Why Exchange Rate Trades Are Simpler Than Interest Rate
Interest rate trades within the same currency are correlated across time because they are all driven by movements in a single yield curve. Exchange rate trades do not have this same time-dimension correlation. An FX forward maturing in 3 months and one maturing in 3 years, on the same currency pair, are not meaningfully more or less correlated with each other based on their maturity dates alone — the primary risk factor is simply the spot exchange rate.
Because of this, the regulation does not require FX trades to be split into maturity time buckets the way interest rate trades are. Instead, every FX trade referencing the same currency pair within a netting set falls into a single hedging set, and the Hedging Set Amount is simply the absolute value of the sum of all ADCAs in that hedging set.
What Defines an FX Hedging Set
Under §217.132(c)(2)(iii)(B), a hedging set for exchange rate derivative contracts is defined as:
“With respect to exchange rate derivative contracts, all such contracts within a netting set that reference the same currency pair.”
This means a bank with a netting set containing EUR/USD forwards, GBP/USD forwards, and EUR/USD swaps has two FX hedging sets: one for EUR/USD (combining the forwards and swaps) and one for GBP/USD. Each currency pair is treated entirely independently — there is no cross-currency-pair correlation recognised in the standard formula.
Step 1 — Calculate the Adjusted Notional
For exchange rate derivatives, the Adjusted Notional is determined differently than for interest rate trades — there is no Supervisory Duration calculation. Instead, the rule depends on which currencies are involved in the trade.
Standard Case — One Leg in USD
Most FX trades involve one leg denominated in US dollars and one leg in a foreign currency. In this case, the Adjusted Notional is simply the notional amount of the non-USD leg, converted to US dollars using the exchange rate on the date of calculation.
| Adjusted Notional = Notional of non-USD leg × Spot Exchange Rate (to USD) |
| Only the foreign-currency leg’s notional matters — the USD leg notional is not separately counted. |
| Worked Example 1 — Standard EUR/USD Forward Trade: Bank buys EUR 20,000,000 forward Sells USD Spot rate: EUR/USD = 1.08 Adjusted Notional = 20,000,000 × 1.08 Adjusted Notional = $21,600,000 |
Special Case — Both Legs in Non-USD Currencies
If neither leg of the FX trade is denominated in US dollars — for example, a EUR/GBP forward — the Adjusted Notional is the notional of whichever leg is larger when both legs are measured in US dollars.
| Adjusted Notional = MAX( Leg 1 in USD , Leg 2 in USD ) |
| Applies specifically to cross-currency pairs where neither side of the trade is USD. |
| Worked Example 2 — EUR/GBP Cross-Currency Forward Trade: Bank buys EUR 15,000,000 Sells GBP 12,800,000 EUR/USD spot = 1.08 Leg 1 in USD = 15,000,000 × 1.08 = $16,200,000 GBP/USD spot = 1.27 Leg 2 in USD = 12,800,000 × 1.27 = $16,256,000 Adjusted Notional = MAX($16,200,000, $16,256,000) Adjusted Notional = $16,256,000 |
Special Case — Multiple Exchanges of Principal
Cross-currency swaps frequently exchange principal more than once over the life of the trade — for example, at inception and again at maturity, or with periodic principal resets. The regulation requires the Adjusted Notional to scale with the number of exchanges:
| Adjusted Notional = Notional × Number of Exchanges of Principal |
| A standard FX forward has 1 exchange. A cross-currency swap with principal exchanged at both start and maturity has 2 exchanges. |
“Notwithstanding paragraph (c)(9)(ii)(B)(1) of this section, for an exchange rate derivative contract with multiple exchanges of principal, the Board-regulated institution must set the adjusted notional amount of the derivative contract equal to the notional amount of the derivative contract multiplied by the number of exchanges of principal under the derivative contract.”
| Worked Example 3 — Cross-Currency Swap with Two Principal Exchanges Trade: 5-year cross-currency swap, EUR 10,000,000 notional Principal exchanged at trade inception AND at maturity (2 exchanges) EUR/USD spot = 1.08 Base Adjusted Notional = 10,000,000 × 1.08 = $10,800,000 Adjusted Notional (with multiple exchanges) = $10,800,000 × 2 Adjusted Notional = $21,600,000 This is double the Adjusted Notional of an equivalent single-exchange forward of the same size, reflecting the doubled principal risk. |
Step 2 — Determine the Supervisory Delta
For Linear Instruments (FX Forwards, FX Swaps)
| Delta = +1 (long the foreign currency) or −1 (short the foreign currency) |
| Determined by whether the contract’s value rises or falls when the reference exchange rate increases. |
For FX Options
FX options use the same Black-Scholes-style delta formula structure as interest rate options, with the FX-specific supervisory option volatility input. For a bought call option on the foreign currency:
| Delta = Φ( [ln(P/K) + 0.5σ²T/250] / (σ√(T/250)) ) |
| Φ = standard normal CDF | P = current spot rate | K = strike rate | T = business days to exercise | σ = supervisory option volatility (15% for FX, from Table 3) |
Note the supervisory option volatility for FX is 15% — materially lower than the 50% used for interest rate options — reflecting the empirically lower volatility of major currency pairs relative to interest rate movements over equivalent horizons.
Step 3 — Calculate the Maturity Factor
The Maturity Factor formula for FX trades is identical in structure to the interest rate asset class — there is no FX-specific variation.
For Trades Subject to a Variation Margin Agreement
| MF = (3/2) × √(MPOR / 250) |
| Same MPOR floors apply: minimum 10 business days standard, 5 for client-facing trades, 20 for large or illiquid netting sets. |
For Trades Not Subject to a Variation Margin Agreement
| MF = √( min{M, 250} / 250 ) |
| M = remaining maturity in business days, floored at 10 business days |
Step 4 — The Supervisory Factor for Exchange Rate
Like the interest rate asset class, the exchange rate Supervisory Factor is a single flat number that applies regardless of which currency pair is involved:
| Supervisory Factor (Exchange Rate) = 4.0% |
| Applies uniformly to every FX derivative contract — EUR/USD, GBP/JPY, USD/INR, or any other pair. |
This flat 4.0% factor is eight times larger than the 0.50% used for interest rate, reflecting the regulation’s view that, trade for trade, exchange rate movements pose materially more risk over the relevant time horizon than interest rate movements of the kind typically embedded in standard swaps.
Putting It Together — The ADCA Formula
| ADCA = Adjusted Notional × Supervisory Delta × Maturity Factor × Supervisory Factor |
| Worked Example 4 — Full ADCA Calculation Trade: EUR 20,000,000 forward Bank is long EUR Maturity: 9 months from today Not subject to a variation margin agreement Adjusted Notional: $21,600,000 Supervisory Delta (long the foreign currency): +1 Maturity Factor: M = 9 months ≈ 188 business days MF = √(min(188,250)/250) = √(188/250) = √0.752 = 0.867 Supervisory Factor (Exchange Rate): 4.0% ADCA = 21,600,000 × 1 × 0.867 × 0.04 ADCA = $749,088 |
Figure 1: Exchange rate hedging set build-up — no time buckets required | Source: 12 CFR §217.132(c)(8)(ii), (c)(9)
Step 5 — Calculating the Hedging Set Amount
This is where the exchange rate methodology diverges most clearly from interest rate. There are no time buckets to assign, no correlation formula with cross-terms, and no choice between two alternative formulas. The Hedging Set Amount for an FX hedging set is simply:
| Hedging Set Amount = | Σ ADCA | |
| The absolute value of the sum of all ADCAs for trades referencing the same currency pair within the netting set. |
Because the formula sums signed ADCAs before taking the absolute value, offsetting positions within the same currency pair net against each other naturally. A bank long EUR/USD on one trade and short EUR/USD on another, in similar size, will see those exposures largely cancel out within the same hedging set — a meaningful risk-reduction benefit for banks running offsetting FX books with the same counterparty.
| Worked Example 5 — Hedging Set Amount with Offsetting Trades EUR/USD hedging set contains three trades with the same counterparty: Trade A: Long EUR forward, ADCA = +$749,088 Trade B: Short EUR forward, ADCA = -$412,000 Trade C: Long EUR option, ADCA = +$165,500 Sum of ADCAs = 749,088 + (-412,000) + 165,500 = $502,588 Hedging Set Amount = |502,588| = $502,588 Compare this to the sum of absolute values of each trade individually (749,088 + 412,000 + 165,500 = $1,326,588) — netting within the hedging set reduces the recognized exposure by more than 60% in this example. |
Special Cases Within the Exchange Rate Asset Class
Volatility Derivative Contracts
An FX volatility derivative — such as a straddle traded purely for volatility exposure on a currency pair — uses a Supervisory Factor equal to five times the standard factor. For FX, this means 4.0% × 5 = 20.0% rather than the standard 4.0%.
FX Trades Embedded in Cross-Currency Swaps
A cross-currency swap typically has both an interest rate component (the floating or fixed rate legs) and an exchange rate component (the principal exchange). Under SA-CCR, the notional exchange portion of a cross-currency swap is captured in the exchange rate hedging set using the multiple-exchanges-of-principal rule covered above, while the periodic interest payments are captured separately in the relevant interest rate hedging set(s) for each currency.
No Basis Derivative Variant for FX
Unlike interest rate, which has a specific basis derivative provision (half the standard Supervisory Factor), the exchange rate asset class does not have an equivalent basis variant in the regulation. All standard FX derivative contracts use the flat 4.0% Supervisory Factor regardless of structure, aside from the volatility derivative exception above.
Quick Summary
- Exchange rate hedging sets are defined per currency pair — EUR/USD and GBP/USD trades with the same counterparty form two separate hedging sets.
- Adjusted Notional for standard USD-leg trades is simply the foreign-currency leg’s notional converted to USD.
- For trades where neither leg is USD, Adjusted Notional is the larger of the two legs measured in USD.
- Trades with multiple exchanges of principal (common in cross-currency swaps) multiply the Adjusted Notional by the number of exchanges.
- ADCA = Adjusted Notional × Supervisory Delta × Maturity Factor × Supervisory Factor. The FX Supervisory Factor is a flat 4.0%.
- Unlike interest rate, there are no maturity time buckets for FX. The Hedging Set Amount is simply the absolute value of the sum of all ADCAs in the hedging set.
- This simple sum-then-absolute-value structure means offsetting long and short positions in the same currency pair net against each other directly, unlike the partial correlation structure used for interest rate.
- FX volatility derivatives use five times the standard Supervisory Factor (20.0% rather than 4.0%). There is no basis derivative variant for FX.
Frequently Asked Questions
Why doesn’t the exchange rate asset class use maturity time buckets like interest rate does?
Time buckets exist for interest rate because positions of different maturities on the same yield curve are correlated with each other — a 2-year and an 8-year position both move with the same underlying curve, just to different degrees. Exchange rate risk does not have this same maturity-based correlation structure; the primary risk factor is the spot rate itself, not a curve. The regulation therefore uses a single, simpler hedging set per currency pair with no time dimension.
How is Adjusted Notional calculated for a EUR/GBP forward where neither leg is in USD?
Both legs of the trade are first converted to US dollars using the spot exchange rate on the calculation date. The Adjusted Notional is then set equal to whichever of the two USD-equivalent legs is larger. This ensures the calculation captures the larger side of the currency exposure even when USD is not directly involved in the trade.
Why does a cross-currency swap have a higher Adjusted Notional than a single FX forward of the same size?
Cross-currency swaps typically exchange principal more than once over their life — commonly at both inception and maturity. The regulation requires the Adjusted Notional to be multiplied by the number of principal exchanges, reflecting that each exchange represents a separate point of principal risk. A swap with two exchanges therefore has double the Adjusted Notional of an equivalent single-exchange forward.
Why is the FX Supervisory Factor (4.0%) so much higher than the interest rate Supervisory Factor (0.50%)?
The Supervisory Factor reflects the regulation’s calibrated view of how much a given notional exposure could move in the bank’s favour or against it over the relevant risk horizon. Exchange rate movements, calibrated empirically, represent materially more potential variability per unit of notional than the interest rate movements typically embedded in standard swap structures — hence the higher factor.
Does netting work the same way for FX as for interest rate?
The mechanics differ. For interest rate, ADCAs are summed within three separate time buckets, and the buckets are then combined with partial correlation using cross-terms. For FX, all ADCAs in a hedging set (regardless of maturity) are summed directly into one signed total, and the absolute value of that total becomes the Hedging Set Amount. This means FX netting between offsetting long and short positions is generally more complete than the partial diversification credit given across interest rate time buckets.