NII Coverage Ratio: The Dividend Test BDC Investors Should Actually Watch

Last updated: May 2026

NII coverage ratio shows whether a BDC is earning enough net investment income to cover its dividend. If a BDC earns $0.55 per share of net investment income and pays a $0.50 dividend, coverage is 110%.

That is the calculation.

The reason investors should care is simple: a dividend is only as strong as the income supporting it.

A high BDC yield can look attractive on the surface. NII coverage helps investors see whether that yield is actually being earned, whether the cushion is getting thinner, and whether the dividend may be depending on temporary conditions that will not always be there.

That is why the ratio is worth monitoring. It turns a dividend from a headline number into a basic test of income support.

What does NII mean?

NII stands for net investment income. For a BDC, net investment income is the income left after investment income is reduced by expenses, interest costs, management fees, and other operating costs.

Most BDC income comes from interest on loans to private companies. The BDC earns interest, pays its own borrowing costs and expenses, and what remains is net investment income.

If the dividend is the cash leaving the machine, NII is one way to see whether the machine is producing enough fuel.

That makes NII one of the most important numbers in BDC investing.

Not because it tells you everything.

Because it tells you where to start.

What is the NII coverage ratio?

The NII coverage ratio compares net investment income to the dividend.

NII coverage ratio = net investment income per share ÷ dividend per share

Coverage above 100% means the BDC earned more NII than it paid in dividends for that period. Coverage below 100% means the dividend exceeded NII.

A single quarter can be noisy. The trend matters more than one reading.

Strong coverage

If a BDC earns $0.60 per share of NII and pays a $0.50 dividend, coverage is 120%.

That means the dividend has a cushion. The BDC earned more than it paid out, at least for that period.

Thin coverage

If a BDC earns $0.51 per share of NII and pays a $0.50 dividend, coverage is 102%.

The dividend is covered, but barely. There is little room for weaker fee income, higher funding costs, borrower stress, or lower portfolio income.

Under-covered dividend

If a BDC earns $0.45 per share of NII and pays a $0.50 dividend, coverage is 90%.

The dividend is not fully earned by NII. That does not automatically mean an immediate cut, but it does mean investors need to understand what is filling the gap.

Why NII coverage matters for BDC dividends

BDC dividends can look safe long after risk starts building.

That is why coverage matters.

If NII consistently covers the dividend, the BDC has more room to absorb credit stress, funding-cost pressure, or slower portfolio growth. If coverage is thin, the margin for error shrinks.

A few borrowers stop paying.

Funding costs rise.

Fee income slows.

Non-accruals increase.

Suddenly the dividend that looked comfortable begins to depend on the kindness of the cycle.

Coverage is not a guarantee.

It is a pressure gauge.

What is a good NII coverage ratio?

There is no single magic number, but higher and more consistent coverage is generally better.

A BDC covering its dividend at 115% or 120% has more cushion than one covering at 101%.

But quality matters too.

Strong coverage can come from durable recurring income. It can also come from temporary fee income, high base rates, unusually active repayments, or non-cash income.

Investors should ask whether coverage is recurring, whether income is coming in cash, whether non-accruals are rising, whether NAV is stable, and whether funding costs are eating into spreads.

A good ratio is not just high.

It is durable.

How NII coverage can mislead investors

NII coverage can look strong even when the portfolio is becoming less healthy.

A BDC may report income from payment-in-kind interest. That income may be recognized before cash is collected. If PIK income rises, reported coverage may look better than cash collection feels.

Coverage can also benefit from high base rates. Many BDC loans are floating-rate, so income can rise when rates rise. But those same rates can pressure borrowers.

The lender earns more because rates are higher.

The borrower struggles because rates are higher.

Both can be true at the same time.

That is the tension inside many BDCs.

NII coverage vs cash quality

NII coverage tells investors whether the dividend is being earned on the income statement.

Cash quality asks whether that income is being collected in cash.

That distinction matters because dividends are paid in cash. If reported NII depends heavily on PIK income, fee income, or income that may not repeat, the coverage ratio can look stronger than the dividend’s real cash support.

A useful investor question is:

Would the dividend still look covered if non-cash or unusually temporary income were excluded?

That question does not reject NII coverage.

It sharpens it.

NII coverage vs NAV

NII coverage tells you about income.

NAV tells you about asset value.

A BDC with strong coverage and falling NAV deserves a closer look. The income statement may still look fine while the balance sheet begins to whisper.

Coverage tells you whether the dividend is being earned.

NAV tells you whether the loan book is still trusted.

Both matter.

A BDC can cover its dividend while the portfolio slowly weakens.

A BDC can also show temporary NAV pressure while income remains durable.

The pattern matters more than the isolated number.

NII coverage and non-accruals

Non-accruals are loans that are no longer producing normal interest income because collection has become uncertain.

That makes non-accruals one of the most important companions to NII coverage.

If non-accruals rise, income can weaken. If income weakens, dividend coverage can tighten. If coverage tightens while NAV also declines, the market may start questioning the dividend before management changes it.

This is how BDC risk often travels.

Not all at once.

Through the machine.

From borrower stress to income pressure.

From income pressure to dividend pressure.

From dividend pressure to valuation pressure.

How investors should use NII coverage

NII coverage should be used as a first test, not a final verdict.

Ask these questions:

• Is coverage above or below 100%?
• Has coverage improved or weakened over several quarters?
• How much of NII is recurring cash income?
• Is fee income unusually high?
• Is PIK income rising?
• Are non-accruals increasing?
• Is NAV stable?
• Are funding costs rising faster than asset yields?
• Is management supporting the dividend with sustainable income or temporary conditions?

The goal is not to worship one ratio.

The goal is to understand the dividend machine.

Investor Quick Answers

What is NII coverage ratio?

NII coverage ratio compares a BDC’s net investment income with its dividend. It shows whether the dividend is being earned from investment income.

How do you calculate NII coverage?

Divide net investment income per share by dividends per share. If a BDC earns $0.55 of NII and pays a $0.50 dividend, the coverage ratio is 110%.

Is 100% NII coverage good?

Coverage at 100% means the dividend is covered, but there is no cushion. Investors usually prefer coverage meaningfully above 100%, especially when credit stress or funding costs are rising.

Why does PIK income matter for NII coverage?

PIK income can increase reported investment income before cash is collected. That can make coverage look stronger while cash quality is weaker.

Can a BDC cover its dividend and still be risky?

Yes. A BDC can show dividend coverage while NAV declines, non-accruals rise, PIK income grows, or funding costs pressure future spreads. Coverage matters, but it is not the whole thesis.

What is the biggest warning sign in NII coverage?

The biggest warning sign is coverage that looks adequate only because of temporary or lower-quality income while NAV, non-accruals, or borrower quality are moving in the wrong direction.

Read next

Start with What Is a Business Development Company?, then read How BDC Dividends Actually Work.

For the broader map, read BDCs: The Public Door Into Private Credit and The BDC Investing Guide.

For company examples, compare Ares Capital (ARCC) and Hercules Capital (HTGC).

For warning lights, read PIK Income Explained, What Are Non-Accruals?, and What Is NAV?.

Source Notes

This explainer is based on The Drift’s BDC research framework, public BDC filings, standard investment-company reporting concepts, and the recurring dividend-coverage metrics used across publicly traded BDCs.