# Total Return Swap on Single Govt Bond Marked to Market Calculation

Looking to understand how to value a TRS on single 10y UST during the life of the trade. Here is an example of trade parameters.

• 10mm constant notional
• 1-year maturity
• I am performance leg payer / funding leg receiver
• Funding leg is a fixed rate at 0%
• Dirty Bond Price at inception of trade is 99
• Underlying bond is a 10y UST with a 1% coupon
• Trade was executed same day as coupon payment so 1 day from now = 1 day of accrued interest

In one month from now:

• Bond price is 98
• Funding rates are now at 0.10%

Would this be correct MTM?

• Accrued Interest = (10,000,000 * .01 * 30/365) = -8,333.33 pay to cpty
• Performance = 10,000,000 * (98/100)-(99/100) = +100,000 due to me because I am performance leg payer (short the bond)
• Performance Leg MTM = 100,000 - 8,333.33 = 91,666.67
• Funding Leg MTM = 10,000,000 * (0.10% * 30/365) = -833.33 against me because I locked in at zero so I am worse off by the 10bps increase in the funding rate?

Total MTM = +91,666.67 - 833.33 = 90,833.33

Do you calculate the MTM of performance leg off the 10mm but the funding leg off the Funding notional (10,000,000 * 99/100)= 9.9mm?

Really appreciate any guidance here. Thank you!