Discount Margin (DM)
Reviewed by Jack Shrimpton, Senior Finance Content and Production Manager at xUnlocked · Last updated July 2026 The discount margin (DM) is the spread over the reference rate that equates a floating-rate note’s expected future cash flows to its current market price. In other words, it shows the return an investor is expected to earn over the benchmark rate, such as SOFR or, historically, Libor, once the note’s current price is taken into account. The value of a floating-rate note depends on future coupon payments, which are uncertain because they reset in line with the underlying reference rate. The quoted margin is the contractual spread the note pays above or below that reference rate. At issue, the quoted margin usually reflects the spread investors require to compensate them for the issuer’s credit risk, liquidity risk and other features of the note. After issuance, however, the quoted margin remains fixed. If the issuer’s credit risk improves or worsens, or if market conditions change, investors may require a higher or lower spread than the quoted margin. That market-required spread is the discount margin. If the discount margin is higher than the quoted margin, the FRN will usually trade below par. If the discount margin is lower than the quoted margin, the FRN will usually trade above par.
Quoted margin vs. required margin vs. discount margin
- Quoted margin: The fixed spread over the reference rate that the FRN was issued to pay (e.g. SOFR + 150bps). This is set at issuance and doesn't change.
- Required margin: The spread over the reference rate that investors currently demand, given the issuer's present credit risk. This moves as the market's view of the issuer changes.
- Discount margin: The gap between the quoted margin and the required margin, expressed as a spread. It's effectively the adjustment needed to reconcile what the bond pays with what the market now wants, and it's what makes the FRN price above, at, or below par.
If an issuer's credit quality deteriorates, the required margin rises above the quoted margin, the FRN trades below par, and the discount margin captures that gap, and vice versa if credit quality improves.
Why discount margin matters to investors
Frequently asked questions
A widening discount margin usually signals that the market perceives the issuer's credit risk as increasing, investors are demanding more compensation than the bond's fixed quoted margin provides, pushing the note's price below par.
No. Yield measures total return including price and coupon; discount margin isolates the spread over the reference rate needed to explain the note's current market price, stripping out the effect of the (variable) reference rate itself. For an FRN, discount margin is the more useful risk metric because the coupon itself moves with the market.
