Callable Swap 之企業債務管理實證研究與其定價敏感性分析

Abstract

本研究以 Toyota Motor Credit Corporation（TMCC）於 2018 年發行的七年期浮動利率債券作為案例，探討企業在面對利率波動風險時，運用不同利率交換策略以優化資金成本之可行性與成效。該債券採季付利率，計價方式為 3m Term SOFR 加 93.161 bps。本文透過實際市場利率資料回溯模擬三種策略之表現：一、完全不避險，持有浮動債至期末；二、發債同時搭配 vanilla 固定利率交換（IRS）；三、採用具 Bermudan 選擇權的固定可贖回利率交換（Fixed Callable Swap），並於 NPV 為負時啟動 Call 回重作，以降低利息成本。 研究方法採用 Bloomberg 資料搭配歷史 SOFR 資料進行現金流試算與 NPV 折現分析，並以 Zero Curve 進行比較基準化。結果顯示，固定可贖回 swap 策略在 2019 至 2021 年利率快速下行期間發揮重大效果，使企業得以於利率低點重新鎖定更低的固定利率，達成資金成本節省之目標。在三種策略中，callable swap 策略的名目利息支出與折現後成本皆為最低，明顯優於 vanilla swap 與持有浮動債策略。 本研究實證顯示，callable swap 策略在預期利率具下行風險時，具備高度策略價值與資金彈性，惟其本質上內含複雜選擇權價值與執行條件，須視企業風控能力與市場環境審慎選用。實務建議方面，企業如能建立敏捷的利率管理機制並搭配條件式執行邏輯，將可有效掌握市場變化，進一步優化負債成本結構。

This study examines the interest rate hedging strategies employed by Toyota Motor Credit Corporation (TMCC) for a 7-year floating rate bond issued in 2018, with quarterly interest payments based on 3M Term SOFR + 93.161 bps. Three scenarios are backtested using historical SOFR data: (1) holding the bond without any hedging, (2) entering a vanilla interest rate swap (IRS) to lock in fixed funding costs, and (3) adopting a fixed callable swap with embedded Bermudan options, allowing for re-entry when the swap's NPV turns negative. Using Bloomberg analytics and zero curve discounting, the study compares cash flow outcomes and net present value (NPV) under each strategy. Results show that the fixed callable swap significantly outperforms in a falling rate environment (2019–2021), enabling the firm to repeatedly reset to lower fixed rates. Among the three strategies, the callable swap results in the lowest total interest cost and lowest NPV, outperforming both the vanilla swap and unhedged approach. The findings suggest callable swaps provide strategic value and cost flexibility in declining interest rate cycles. However, due to their embedded option complexity, firms must weigh execution conditions and internal risk management capabilities before adoption.