Before you start
From origination to repayment: how a BDC investment earns and loses money, NII and distribution coverage: match the income, denominator and period, BDC leverage and asset coverage: a descriptive ratio is not a compliance test
- Model asset and funding-rate changes on matching annual bases.
- Identify when a floor changes the shape of a sensitivity.
- Separate contractual repricing from borrower stress and credit marks.
Map assets and liabilities before choosing a direction
A portfolio of floating-rate loans does not automatically make higher rates favorable for common shareholders. The BDC also funds itself through facilities, notes and other liabilities, some of which reprice or are economically altered by derivatives. Record the benchmark, spread, reset date, principal and hedging arrangement on each side. A fixed-coupon bond can have a different economic exposure after a swap. A portfolio percentage labeled floating rate is therefore a starting point, not a complete sensitivity model. Keep contractual coupon, effective interest cost and derivative cash settlements distinct when building the bridge.
A common mistake
Applying the same rate change to every asset and liability while ignoring floors, reset timing or swaps.
What to check in the disclosures
- List benchmarks, spreads, floors, caps and reset dates.
- Identify fixed debt changed economically by derivatives.
- Separate contractual sensitivity from credit and valuation scenarios.
- Retain the issuer sensitivity's assumptions and reporting date.
Floors introduce thresholds rather than a constant slope
An asset floor can limit how far a loan's reference rate falls for coupon purposes, while liability floors and other terms can affect the funding side. A rate cut that crosses a floor can produce a different effect from an equally sized cut above it. Test the benchmark before and after the move against each threshold; do not multiply every floating balance by the same change blindly. Reset lags, payment schedules, caps and the treatment of default interest can also matter. A single company-wide average floor can conceal loans on opposite sides of the threshold.
Credit performance can move against the coupon benefit
Higher contractual interest may increase the borrower's financing burden, pressure its coverage and eventually reduce collections or fair values. Lower rates can ease that burden while compressing the lender's contractual revenue. These effects occur through different channels and need not be simultaneous. A first-order interest sensitivity that keeps principal, performing status and expenses unchanged should say so. Do not add a separate credit loss mechanically unless the scenario defines which borrower deteriorates, what recognition changes and how marks move. Otherwise the model can count the same adverse development twice or imply an unsupported forecast.
Use scenarios to identify the next disclosure needed
Calculate the isolated asset-income change and the isolated funding-expense change before netting them. Then consider fees, leverage, non-accruals and reinvestment under explicitly different assumptions. Compare your contractual scenario with the issuer's disclosed interest-rate sensitivity, noting its date, scope and exclusions instead of assuming the two should match. A model that identifies the missing hedge notional or reset schedule can be useful even when a precise final answer is unavailable. The purpose is to explain what would change under stated conditions, not assign a probability to a rate path or promise a dividend response.
Synthetic: crossing an asset floor changes the net result
Assume 1,000 of floating assets earn benchmark plus 6%, with a 3% benchmark floor. Debt of 600 costs benchmark plus 2%, without a floor or hedge. At benchmark 4%, annual asset interest is 100 and funding interest is 36, leaving 64 before all other items. If benchmark falls to 2%, the asset floor makes its coupon 9%, so asset interest is 90; funding interest falls to 24. The difference becomes 66. Without the asset floor, asset interest would be 80 and the difference 56. These invented full-year balances assume no defaults, repayments, fees or other changes.
Test your reasoning
In the synthetic model, why does the net interest difference improve by 2 after the cut?
Reveal the worked answer
The asset floor limits the asset-income decline to 10, while funding expense falls by 12. The resulting 2 improvement is before operating expenses, fees, credit changes and other items; it is not a complete NII forecast.
Check your understanding
Sources & scope
US BDC education. Examples are hypothetical unless expressly attributed. Filing dates, contractual definitions and tax rules matter. An issuer source describes that issuer; it is not evidence that every BDC uses the same policy.
- Ares Capital original 2025 Form 10-K: historical definitions, not current issuer data; check amendments and later filings ↗
- Ares Capital January 2025 filed financing prospectus: instrument terms and claims — historical example ↗
Educational material, not a recommendation or personalized investment advice. Source and correction policy.