Understanding Good Debt vs Bad Debt

Ask a director in their first year of trading whether they want debt on the balance sheet, and the answer is almost always no. Ask the same director five years in, after a growth round they could not quite fund out of retained profits, and the answer is more nuanced.

Not all business debt is the same, and some of it, used deliberately, is the mechanism by which a small company becomes a medium-sized one.

Below we cover the honest map of when business debt works for you and when it does not. We cover the distinction between good debt and bad debt, the specific tests that separate them, how to audit your own current debt profile, and the point at which the balance tips from useful leverage into the distress territory the rest of this site covers.

Good Debt vs Bad Debt in UK Business Finance

The framing most finance textbooks use, “good debt funds assets, bad debt funds consumption”, is broadly right but too coarse for your small business reality. A more useful split is based on what the debt does to your future cash flow.

• Good debt is debt where the after-tax return on the activity the debt funds exceeds the cost of the debt, and the repayment schedule aligns with the cash the activity generates.
• Bad debt is debt where the return does not exceed the cost, or where the repayment schedule sits out of sync with the cash the funded activity produces.

Those two tests, return over cost, repayment aligned with cash, do most of the analytical work in deciding whether your business should take on a given facility.

What Good Debt Looks Like for a UK Business

Good business debt shares a defined set of characteristics you can test your own facilities against:

• Funds a revenue-generating asset. Machinery that increases output. Vehicles that expand service radius. Property that reduces occupancy cost over a long horizon. Software that removes a bottleneck.
• Scalable return. The funded activity generates incremental revenue that grows faster than the debt service.
• Term-matched to asset life. Equipment finance over 5 years on equipment that produces for 8 is sensible. Equipment finance over 5 years on software that will be replaced in 2 is not.
• Priced at or below the return the asset generates. Borrowing at 8% to fund an activity returning 15% after tax is accretive. The reverse destroys value.
• Structured without asymmetric downside. Facilities without personal guarantees on the director, or with PGs capped and facility-specific rather than all-monies, keep the limited-liability shield intact.

Typical good-debt instruments

• Asset finance for equipment, vehicles, or technology, secured on the asset, term matched to life.
• Commercial mortgage on owner-occupied premises, where debt service is below market rent.
• Invoice finance at a sensible advance rate (80–90%) to bridge the working-capital gap without permanent borrowing.
• Government-backed growth loans (Recovery Loan Scheme, Growth Guarantee Scheme) where the partial guarantee reduces the lender’s required personal security.

What Bad Business Debt Looks Like

Bad debt is not always the facility itself. In our experience, it is usually the specific use, the pricing, or the structure that turns a reasonable product into a problem.

• Short-term borrowing to fund ongoing losses. If the company is losing £5,000 a month and borrows £60,000 at 20% APR, the debt extends the runway without changing the outcome. That is the most common bad-debt pattern in distressed cases.
• High-cost merchant cash advance or bridging loans priced at 30%+ effective APR, taken to cover a working-capital gap that a cheaper facility could have filled.
• Debt stacked on PGs from multiple lenders. Each individual facility is manageable; the combined personal guarantee exposure across four lenders is the problem.
• Director’s loan accounts used to fund personal expenditure, creates a section 455 tax liability at 33.75% of the outstanding balance 9 months after year-end, on top of the cash-flow cost.
• Unpaid HMRC liabilities treated as free credit. Accumulating VAT, Corporation Tax, or PAYE arrears costs the company at HMRC’s interest rate plus compounding penalties, and is one of the clearest external indicators of cash-flow insolvency.

The last two catch directors out most often because neither feels like “debt” in the traditional sense. HMRC arrears in particular are treated as flexible, right up until the moment they stop being flexible. If your company has drifted into either pattern, we would treat that as an urgent signal.

Assessing Your Current Business Debt Profile

A quarterly audit of your company’s debt position answers five questions. Run this yourself with your last three months of management accounts. We recommend building this into your board calendar:

1. Debt-service coverage ratio (DSCR). Earnings before interest and tax divided by debt service for the same period. Healthy businesses sit above 1.5x; below 1.25x is where covenants typically trip.
2. Weighted average cost of debt. Total interest across all facilities divided by average total borrowing. If this exceeds the after-tax return on capital, the debt stack is destroying value.
3. PG exposure concentration. Which director sits behind which facility, on what cap, with what scope clause. A spreadsheet listing each PG by facility is worth more than most directors expect.
4. Term-to-maturity profile. What refinances when. A wall of maturing debt in the same year is a structural risk regardless of current affordability.
5. Covenant headroom. How close current trading is to each material covenant. Breach is often technical and early, but it changes the lender’s posture immediately.

Done once a quarter with your numbers in front of you, this audit takes under two hours and catches every predictable refinancing problem roughly six months before it would otherwise surface.

When Good Debt Becomes Bad: The Tipping Points

Debt that worked for you in year one can turn structural by year three without the original pricing changing. The tipping points to watch in your own debt portfolio:

• Rising interest rates on variable-rate facilities, where the covenant was set against a lower base rate.
• Asset life shorter than expected, where the funded equipment is replaced before the finance is repaid.
• Revenue assumption unmet, where the activity the debt funded did not produce the anticipated return.
• Related debt taken on top, where the original facility was fine standalone but compounds with subsequent borrowing.

Recognising the tipping point while it is recoverable means treating your debt stack as a living portfolio, not a static liability. In our view, refinancing, consolidating, or early repayment of your most expensive facilities is almost always cheaper when you do it proactively than when it is forced. We see the opposite approach far too often.

When Business Debt Tips Into Insolvency Territory

Where your debt has tipped from useful leverage to unsustainable liability, the Insolvency Act 1986 framework kicks in and your position as a director changes:

• Cash-flow test failed: the company cannot pay debts as they fall due.
• Balance-sheet test failed: liabilities (including contingent) exceed assets.
• Director duty shift under section 172 of the Companies Act 2006 from shareholders to creditors.

At that point, your options for addressing the debt shift from commercial refinancing to formal restructure: CVA, administration, or CVL. A licensed insolvency practitioner is the right adviser to test whether your underlying business is viable if the debt is restructured, or whether the business model itself is the problem. We work across all three formal routes.

Your Next Step on Business Debt Management

Three questions determine the right action for your business:

1. Does the debt fund activity returning more than the cost of the debt?
2. Is the repayment schedule aligned with the cash the funded activity generates?
3. Is the director personally exposed beyond the business?

Three yeses means your debt stack is working. Three nos means it is not. A mix is usually fixable, but only through your active management rather than assumption.

If your numbers suggest the stack has tipped, HMRC arrears compounding, PG exposure spreading, debt service consuming your operational cash, an hour with a licensed IP produces a clear view of the options before creditor action forces your timing. Our licensed insolvency practitioners and business rescue specialists can assess your position in confidence. Call free on 0800 074 6757.

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Methodology & Disclosure

This guide is written by the Company Debt editorial team and reviewed by licensed insolvency practitioners. It reflects UK commercial lending, tax, and insolvency frameworks as at the last-reviewed date. Interest rates cited (HMRC late-payment rate, Bank of England base rate) are current as at the reference date; always check current gov.uk guidance for the specific rate applying at the time.

Company Debt is an insolvency advisory firm. Where debt restructure requires formal process, we can act as the licensed Insolvency Practitioner for a CVA, Administration, or CVL under separate engagement. The 0800 number is a free confidential consultation.