Spot Rate vs. Forward Rate: What's the Difference?

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A spot rate is the price for a trade settled now, at standard market settlement. A forward rate is a price agreed today for a transaction that settles on a set future date. Both are quoted at the same moment. The forward rate is not a forecast of where the spot rate will be later. It is derived from today’s spot rate plus the cost of waiting: interest rate differences in currencies, storage and financing costs in commodities, and the shape of the yield curve in bonds. When the forward date arrives, the spot rate on that day may be higher or lower than the forward rate both parties locked in.

Spot rate: the price for settlement now

A spot rate, or spot price, is the price quoted for prompt settlement. “Prompt” follows market convention rather than meaning the same second. In the interbank currency market, a spot trade settles two business days after the trade date (T+2) for most currency pairs. USD/CAD is a well-known exception that settles in one business day. Commodity spot contracts also usually settle within a couple of business days.

Once a spot trade is agreed, the price is fixed even if the market moves before settlement. A buyer at spot accepts today’s price, giving up the chance of a better one later in exchange for avoiding the risk of a worse one. Buyers and sellers who cannot wait trade at spot. One example is a café that needs coffee beans this week. Another is a grower holding a perishable harvest.

In bond markets, “spot rate” has a more specific meaning. It is the yield on a zero-coupon bond for a given maturity: the one-year spot rate, the two-year spot rate, and so on. Plotting those rates against maturity gives the spot curve, also called the zero curve.

Forward rate: a price fixed today for a later date

A forward rate is the price two parties agree on now for a transaction that settles on a specific future date. When that date comes, the trade goes through at the forward rate, regardless of the spot rate prevailing at maturity.

Forwards serve two broad purposes:

• Hedging. An importer that must pay a foreign supplier in six months, or a farmer selling a crop not yet harvested, locks in a price so that future costs or revenue are known today.
• Speculation. A trader who expects the future spot price to end up above the forward rate can buy forward. If the spot price at maturity is higher, the trader profits by the difference. If it is lower, the trader loses.

Forwards are private, over-the-counter contracts, so the amount, date and settlement terms are negotiated between the parties. That separates them from futures, which are standardized and exchange-traded.

How spot and forward rates are linked

A forward rate can be calculated from the spot rate, and the spot rate can be backed out from the forward rate. The conversion works like moving between present value and future value: once the relevant interest rates (or carrying costs) and the time period are known, one rate implies the other. Arbitrage keeps them aligned. If a forward rate drifted away from its fair value, traders could borrow, convert at spot, invest and sell forward for a riskless profit until the gap closed.

In currency markets: covered interest rate parity

For a currency pair quoted as base/quote (for example EUR/USD, where EUR is the base), the fair forward rate is:

Forward = Spot × (1 + i_quote × t) ÷ (1 + i_base × t)

Here i is each currency’s interest rate for the period and t is the fraction of a year, using simple interest for periods under a year.

Hypothetical example: EUR/USD spot is 1.1000, the one-year USD rate is 5%, and the one-year EUR rate is 3%.

Forward = 1.1000 × 1.05 ÷ 1.03 = 1.1214 (rounded)

The euro trades at a forward premium of about 214 pips. The market is not “expecting” the euro to rise. Someone holding euros for a year earns 2 percentage points less interest than someone holding dollars, and the higher forward price exactly offsets that. The currency with the lower interest rate trades at a forward premium. The currency with the higher rate trades at a forward discount. Dealers usually quote the difference as forward points added to or subtracted from spot.

The same interest differential appears in retail spot forex. A spot position held past the daily rollover is extended to the next value date. The broker credits or debits a swap that reflects the two currencies’ rates, which is why the return from holding a spot position over time differs from the return on a single forward bought at the start. The swap a broker actually charges also includes its own markup.

In commodities: cost of carry and basis

For a storable commodity, the forward price reflects what it costs to buy at spot and hold until delivery: financing, storage and insurance, less any benefit from holding the physical good (the convenience yield). The difference between the spot and forward price is the basis.

Hypothetical example: On January 2, cocoa trades at $8,000 per tonne spot. A chocolate maker and a supplier agree to deliver 20 tonnes on July 1 at a forward price of $8,300. On July 1, the deal settles at $8,300 per tonne. That holds if spot has fallen to $7,500 (the buyer overpaid compared with spot) and if it has climbed to $9,000 (the buyer saved $700 per tonne). The forward removes the uncertainty. It does not guarantee the better price.

In bonds: implied forward rates from the spot curve

A bond forward rate is the yield for a future period implied by today’s spot rates. The logic is that investing for two years at the two-year spot rate should earn the same as investing for one year at the one-year spot rate and then reinvesting for the second year at the forward rate.

(1 + S₂)² = (1 + S₁) × (1 + f₁,₁)

so the one-year rate starting in one year is:

f₁,₁ = (1 + S₂)² ÷ (1 + S₁) − 1

For any two maturities m and n (n > m), the general version is:

f = [(1 + Sₙ)ⁿ ÷ (1 + Sₘ)ᵐ]^(1 ÷ (n − m)) − 1

The root, not a division by the number of years, converts the multi-year growth factor into an annual rate.

Hypothetical example, annual compounding: the one-year spot rate is 4.00% and the two-year spot rate is 4.50%.

1. Two-year growth factor: 1.045² = 1.092025
2. One-year growth factor: 1.04
3. Divide: 1.092025 ÷ 1.04 = 1.050024
4. The period is one year (2 − 1), so no root is needed. Subtract 1: about 5.00%

The one-year rate one year from now, implied by today’s curve, is about 5.00%. That is higher than both spot rates because the curve slopes upward.

Future spot rate vs. forward rate

The forward rate is known today. The future spot rate is whatever the market price turns out to be on the delivery date, and nobody knows it in advance.

Under covered interest parity, the FX forward rate is pinned down by arbitrage and the interest differential. It would equal the expected future spot rate only under extra assumptions, such as investors being indifferent to risk (the idea behind uncovered interest parity). Decades of academic research, starting with well-known studies in the 1980s, have found that forward rates have been poor predictors of future spot rates. Higher-yielding currencies have often not depreciated by as much as their forward discounts implied. In bonds, the gap between implied forward rates and the short rates that later prevail is usually attributed to a term premium.

In practice, the result of a forward position depends on where the future spot rate lands compared with the forward rate:

• Buyer of a forward: gains if spot at maturity > forward rate; loses if spot at maturity < forward rate.
• Seller of a forward: the reverse.

A hedger accepts that outcome on purpose. An importer who buys euros forward at 1.1214 knows the dollar cost of the invoice today, even if spot later trades at 1.0800 and the hedge looks expensive in hindsight.

Spot curve vs. forward curve

Because forward rates are calculated from spot rates, the two curves move together but sit in a predictable relationship:

• Upward-sloping spot curve: forward rates lie above spot rates, as in the 4.00% / 4.50% / 5.00% example.
• Inverted spot curve: forward rates lie below spot rates.
• Flat spot curve: forward rates roughly equal spot rates.

The forward curve exaggerates the slope of the spot curve. Each spot rate is an average of the forward rates up to its maturity, so the marginal forward rate has to sit beyond that average for the average to keep rising (or falling).

Two related instruments are built on these forward rates. An interest rate swap exchanges fixed for floating payments, and the fixed swap rate is set so that its value equals the projected floating payments along the forward curve. A forward rate agreement (FRA) fixes the rate on a single future borrowing period.

FAQs

The Bottom Line

Importers, growers, chocolate makers and currency traders all face the choice between settling now at spot and fixing a later price with a forward. A forward makes future costs or revenue known today, though the spot rate at maturity may end up better or worse than the locked rate. Forwards suit hedgers who value certainty over the chance of a better price, since forward rates have been poor predictors of where spot rates actually land.