A small overview on fx swaps:
Swaps is an agreement to exchange cash flows. So say I (Bank A) have surplus USDs and I need INR. However, Bank B is in the exact opposite situation. So Bank A can swap cash flows with bank B.
I will give out the surplus USDs in exchange for INR and Bank B will do the vice versa with an agreement to swap out the cash flow at the end of the term.
USDINR spot 76.00
USD Rate 0.50%
INR Rate 4.00%
Tenor 1 year
The transaction can also be thought of in terms of buying and selling of money market instrument. So say I buy USD security, I will give out USD to you and receive interest on USD. I sell INR security and receive INR funds and pay out the interest to you.
Basically, interest rate parity is a fundamental concept linking the exchange rate to the interest rate. It defines a no arbitrage condition, wherein my hedged returns are same whether I invest in a USD security and convert it to INR or invest in an INR security and convert it to USDs.
For example, I buy USD 1 mio of US treasuries that are yielding 0.50%. At the end of the period, maturity amount is 1,005,000. I enter into an agreement to sell USD forward and get INR. So I receive 79.04 crs. Alternately, if I invest 7.6 crs in INR security, maturity amount is 79.04 crs. I enter into an agreement to buy USD forward, the USD notional will be equal to 1,005,000.
USDINR forward rate = USDINR spot * (1+inr rate(*price currency))/(1+usd rate(*base currency))
78.6467 = 76.00 * (1+4%)/(1+0.50%)
Swap points = 78.6467 - 76.00 = 2.6467
Generally, the thumb rule is currency with a lower interest trades at a premium.
Now I have generally seen people get confused if the fx swap rates should be positive or negative.
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