Forward Curve Stress Calculator

Floating-rate deals depend on the forward curve. This calculator stresses the curve and measures debt service impact.

Balance

Base forward rate %

Parallel shift (bps)

Spread over SOFR (bps)

Hold years

Annual stressed debt service

$850,000

Stressed coupon %

8.50%

Total hold-period cost

$2,550,000

How the math works

Stressed coupon = base forward + shift + spread. Debt service = balance × coupon.

Stress test with +150 bps and +300 bps scenarios. The latter reflects post-2022-style tightening; it's uncomfortable but not implausible in a 3-5 year hold. Reserves against these paths prevent forced restructuring.

How to Use

Enter notional balance.
Enter base forward rate.
Enter parallel shift.
Enter spread over SOFR.
Enter hold period.
Read stressed debt service.

Frequently Asked Questions

What is the forward curve?

Market-implied path of short rates based on forward contracts and swap rates. Used by lenders to estimate debt service over loan term on floating-rate deals.

How to stress?

Parallel shifts (add 50-200 bps across all tenors) test rising environments. Steepening (short end down, long end up) tests long-rate rises. Invert tests recession. Run at least three scenarios.

Sanity check?

If current 2-year swap is 4.20%, that's the market's average forecast for 2-year floating rates. Add 100 bps to forecast stress; model debt service for the scenario.

How do institutional LPs use this?

Institutional LPs expect sensitivity tables at every underwriting — base case plus at least two stress scenarios. Submit this output alongside traditional pro formas. LPs read quickly for two things: does the base case clear target IRR, and does the stress case produce positive equity multiple. If both yes, deal is investable. If stress goes negative, more equity or a lower purchase price is needed.