Business development companies pay some of the highest yields available in public markets — often 8–12% annually. They do this by lending to mid-market businesses that can't access traditional bank financing. That spread between borrowing cost and lending rate is what you're paid as a shareholder. But before you reach for that yield, you need to understand what you're actually owning.
What a BDC actually is
A BDC is a closed-end investment company regulated under the Investment Company Act of 1940. Congress created the structure in 1980 to channel capital into small and mid-sized American businesses. In exchange for favorable tax treatment — they pay no corporate tax as long as they distribute at least 90% of taxable income — they must invest primarily in U.S. companies, maintain a debt-to-equity ratio below 2:1 (1:1 for older BDCs that haven't opted into the Small Business Credit Availability Act), and value their portfolio at fair value each quarter.
Most BDC portfolios are 80–90% senior secured loans. The rest is mezzanine debt, equity co-investments, or preferred stock. The senior secured concentration is what makes BDCs more resilient than their yields suggest — in a default, secured lenders get paid first.
“A BDC is essentially a closed-end mutual fund that lends to businesses you've never heard of. The yield is real — but so is the credit risk.”
The 4 metrics that matter most
Before buying any BDC, check these four numbers. Everything else is secondary.
1. Net asset value (NAV) per share
NAV is the fair value of the loan portfolio minus liabilities, divided by shares outstanding. A BDC trading at a significant premium to NAV is risky — you're paying more than the assets are worth. Trading at a discount can signal value or it can signal that the market expects write-downs. Compare the current price to NAV before every buy decision. Many BDCs trade at 0.9–1.1× NAV; anything above 1.2× deserves scrutiny.
2. Net investment income (NII) coverage
NII is the interest and fee income earned by the portfolio, after expenses. A BDC with NII coverage above 100% — where NII exceeds the dividend — can sustain its distribution without dipping into capital gains or return of capital. Coverage below 100% means the dividend is partially funded by asset sales or capital, which is a cut waiting to happen.
3. Portfolio quality — non-accrual rate
Non-accrual loans are those where the borrower has stopped making interest payments. They're reported as a percentage of the total portfolio at fair value. Below 2% is healthy. Above 5% suggests credit stress. During recessions, non-accrual rates across the sector can spike to 10–15%, causing NAV write-downs and dividend cuts simultaneously.
4. Leverage ratio
BDCs amplify returns with debt. A 1.2:1 debt-to-equity ratio is conservative; 1.8:1 is aggressive. Higher leverage means higher yields in good times — and steeper NAV erosion in bad times. In a credit cycle downturn, highly leveraged BDCs face margin calls and forced asset sales at the worst moment.
Why BDCs pay monthly
Most BDCs pay dividends monthly rather than quarterly. This is a structural feature, not a marketing choice. Their loan portfolios generate monthly interest payments, so monthly distributions simply match the cash flow pattern of the underlying assets. For income investors, this means monthly compounding when reinvested — and monthly income for those drawing from the portfolio.
The income is taxed as ordinary income in most cases, not at the qualified dividend rate. Plan accordingly if holding in a taxable account. BDCs are generally better suited to tax-advantaged accounts (IRAs, 401ks) where the ordinary income tax treatment doesn't matter.
Red flags to avoid
The BDC space has produced some spectacular failures. Here's what to watch for:
- —Yield above 14%: at that level, either the portfolio is full of distressed debt or the dividend is already impaired. Investigate before buying.
- —Falling NAV over multiple quarters: if NAV is declining 3–5% per quarter, the portfolio is deteriorating. A sustainable dividend requires NAV stability.
- —External management: many BDCs are externally managed, meaning a separate firm (paid via fees) runs the portfolio. Fee structures can misalign incentives — look for internally managed BDCs or externally managed ones with strong track records.
- —Incentive fees on unrealized gains: some fee structures reward managers for paper gains that haven't been realized. Read the fee footnotes.
- —Dividend sourced from return of capital: if more than 30% of distributions come from ROC (reported on Form 1099-DIV Box 3), you're essentially getting your own money back. Tax-deferred, but not income.
The bottom line
BDCs deserve a place in an income portfolio when selected carefully. The best ones — internally managed, conservative leverage, NII coverage above 110%, and a history of maintaining NAV through credit cycles — can deliver 8–10% yields with genuine sustainability. The worst ones will cut the dividend and trade down 40% in the same week. Know which you're buying before you buy.