lev-os Structuring Interest Rate Swaps
Designs IRS structures with fixed/float mechanics, day count conventions, and mark-to-market valuation analysis.
When To Use
- Structuring a plain-vanilla or non-standard interest rate swap for a new financing or refinancing
- Evaluating fixed-vs-floating economics for a borrower or asset manager considering a hedge overlay
- Analyzing mark-to-market exposure and potential termination costs on an existing swap book
- Comparing swap structures (par swap, off-market swap, forward-starting swap, amortizing swap) against hedging objectives
- Reviewing ISDA confirmation terms, payment mechanics, and day count conventions before execution
Inputs To Gather
- Notional profile: Fixed notional, amortizing schedule, or accreting schedule with amounts and dates
- Tenor and dates: Effective date, maturity date, and any forward-start period
- Floating leg details: Reference rate (SOFR, EURIBOR, TONA, etc.), reset frequency, compounding method (in arrears, in advance, payment delay), and spread adjustment [VERIFY applicable fallback language for legacy LIBOR transitions]
- Fixed leg details: Target fixed rate or par-swap rate, payment frequency
- Day count conventions: Specify for each leg (e.g., ACT/360, 30/360, ACT/ACT) [VERIFY market convention by currency]
- Business day convention: Modified Following, Following, or Preceding; relevant holiday calendars
- Current market data: Swap curve (OIS or term rate curve), discount curve, and any basis spread curves
- Valuation date: As-of date for mark-to-market and DV01 calculations
- Counterparty context: Credit support annex (CSA) terms — collateral currency, threshold, minimum transfer amount — to determine proper discount curve (OIS vs. CSA curve)
- Regulatory context: Clearing mandate applicability, initial margin (IM) requirements under UMR, and reporting obligations [VERIFY jurisdiction-specific clearing thresholds]
Workflow
Define the hedge objective — Determine whether the goal is cash-flow hedging (locking in budget certainty), fair-value hedging (offsetting balance-sheet exposure), or speculative positioning. Confirm hedge accounting intent (ASC 815 / IFRS 9) if applicable.
Select swap structure — Choose from:
- Par swap: Zero upfront value; fixed rate = par swap rate from the curve
- Off-market swap: Upfront payment exchanged for an above/below-market fixed rate
- Forward-starting swap: Effective date in the future to match anticipated debt issuance
- Amortizing/accreting swap: Notional schedule mirrors underlying debt amortization
- Basis swap: Float-for-float when converting between reference rates
Build the cash flow schedule — For each leg:
- Generate accrual periods using the specified roll convention and business day rules
- Apply the correct day count fraction per period
- For the floating leg, determine fixing dates, observation periods (for SOFR compounding in arrears), and lockout/lookback adjustments
- Calculate projected floating payments from the forward curve
Price the swap — Discount all projected net cash flows using the appropriate discount curve:
- If cleared or CSA with cash collateral in swap currency → OIS discount curve
- If uncollateralized → credit-adjusted discount curve or funding curve
- Compute the par fixed rate (rate that sets NPV = 0) or the NPV for an off-market rate
- Report the DV01 (dollar value of a 1 bp parallel shift) for each leg and net
Assess risk metrics — Calculate:
- DV01 / PV01: Sensitivity to 1 bp parallel rate move
- Key rate durations (KRDs): Sensitivity at individual tenor buckets along the curve
- Convexity: Second-order rate sensitivity for large moves
- Potential future exposure (PFE): Simulated MTM distribution for counterparty credit risk
- Termination value scenarios: MTM under +/−50, 100, 200 bp rate shifts
Review documentation terms — Confirm alignment of economic terms with ISDA confirmation language:
- Fixed rate, floating rate option, designated maturity, spread, compounding method
- Payment dates, calculation agent, fallback provisions
- Early termination triggers and close-out netting provisions
Compile analysis and recommendations — Summarize the chosen structure, pricing, risk profile, and any trade-offs versus alternative hedging instruments (caps, collars, swaptions).
Output
Deliver a structured report containing:
- Executive summary: Hedge objective, recommended structure, and par swap rate or NPV
- Term sheet / indicative terms: Notional, tenor, fixed rate, floating rate reference and spread, day counts, payment frequencies, business day conventions
- Cash flow schedule: Period-by-period projected payments for both legs with net settlement amounts
- Valuation summary: NPV, DV01/PV01 (net and per-leg), key rate sensitivities
- Scenario analysis table: MTM under parallel and non-parallel rate shifts (at minimum ±50, ±100, ±200 bp)
- Comparison matrix (if applicable): Side-by-side of swap vs. cap vs. collar vs. swaption on cost, risk profile, and accounting treatment
- Assumptions and limitations: Curve construction methodology, interpolation method, credit adjustments, and any data gaps flagged with [VERIFY]
Quality Checks
- Confirm par swap rate is consistent with current broker/dealer indicative screens or Bloomberg SWPM output
- Verify that floating leg projected cash flows reproduce the forward rates implied by the discount curve
- Check that DV01 of the fixed leg and floating leg are approximately equal at the par rate (net DV01 ≈ 0 for a par swap)
- Validate day count fractions by independently computing at least two accrual periods
- Ensure the discount curve selection matches CSA collateral terms — using the wrong curve is a common and material valuation error
- Confirm notional schedule aligns with underlying debt amortization (no over-hedging or under-hedging)
- Flag any periods where the floating rate observation period or fixing methodology does not match market convention with [VERIFY]
- Cross-check that business day adjustments on payment dates match the holiday calendar for the relevant currency center