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I have few doubts regarding transition from IBOR to SOFR rates.

  1. How will the method of calculating/estimating curve rates change after changing to SOFR?

  2. Will there be any change in valuation methodology in plotting future cash flows or will the existing methodology continue?

  3. In Bloomberg, the curve for fixed-floating SOFR shows the date for first tenor as valuation day +3. For example the curve for 1st March shows first pillar date for on rare as 4 April. What is the reason for that?

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  1. SOFR is just an index, like FedFunds or LIBOR, there is no fundamentally different schema for creating a curve. It involves exactly the same considerations you will make as if you are constructing a LIBOR or FFOIS curve, namely:
  • what input prices are available and liquid for calibrating the curve(set).
  • what interpolation scheme is best to employ for each curve (part of curve).
  1. For projecting future cashflows there is no difference. Once the SOFR curve is available you project cashflows according the to formula that determines them. I.e a 3M FFOIS forward uses compounded daily FFOIS fixings. The same is true for SOFR. For forecasting a fallback LIBOR this will also involve a fixed spread addition to the compounded rates.

  2. You will have to be careful about lags on the new SOFR on, for example, bond coupon flows referencing SOFR and fallback libor. But essentially this just defines which fixings to use for which period to compound.

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