Financial Red Flags in Business Accounts: What an Experienced Buyer Sees Before Asking a Single Question
There is a version of financial due diligence that works through a checklist methodically, asks a series of pre-prepared questions, and produces a report that confirms or challenges the headline numbers presented in the information memorandum. That version is fine. It catches the things that a structured process is designed to catch.
Then there is the version that an experienced CFO or M&A adviser does in the first twenty minutes with a set of accounts — a rapid pattern recognition exercise that identifies the specific numbers, ratios, and trends that are inconsistent with the business's narrative, and flags the questions that most need answering before any significant time is invested in the formal process.
The difference between these two versions is not the quality of the checklist. It is the pattern recognition that comes from having read hundreds of sets of accounts and knowing, without being told, what healthy numbers look like versus numbers that are trying to tell you something. This post is an attempt to make that pattern recognition explicit — to describe the specific financial signals that experienced buyers read instinctively, so that less experienced buyers can apply the same lens before they have spent years developing it.
The First Five Minutes: The Relationships That Should Hold
Before reading any individual line in a set of accounts, an experienced buyer looks at the relationships between the key headline figures. These relationships should be broadly consistent with the business's description of itself and with sector norms. When they are not, that inconsistency is the first signal worth investigating.
Revenue to gross margin
Gross margin — revenue minus direct cost of sales, expressed as a percentage of revenue — should be consistent with the type of business being described. A professional services business should have a gross margin above 50% in most cases. A manufacturing business might be 30% to 45%. A distribution business might be 15% to 25%. A gross margin that is materially below sector norms for a business claiming to operate in that sector is an immediate question: is the cost of sales being correctly categorised, or is the business less differentiated than it appears?
More importantly, watch for gross margin movement over time. A gross margin that has compressed steadily over three years — even by a few percentage points per year — is a business whose pricing power is eroding, whose costs are rising faster than revenue, or whose business mix is shifting towards lower-margin work. None of those trends are necessarily fatal, but all of them need to be understood before you price a multiple on the business's earnings.
Gross margin to EBITDA conversion
The conversion from gross margin to EBITDA tells you about overhead efficiency — how much of the gross profit is consumed by central costs before reaching the operating profit line. A business with a 55% gross margin converting to a 12% EBITDA margin is absorbing 43 percentage points in overhead. Is that consistent with the headcount, the premises, the marketing spend, and the management structure described? If the overhead absorption seems high relative to what the business describes itself as having, something in the cost structure needs explaining.
EBITDA to operating cash flow
The gap between EBITDA and operating cash flow is one of the most revealing ratios in any set of accounts. EBITDA is an accounting figure. Operating cash flow is the cash actually generated by the business's operations. The two should be broadly similar for a stable, non-growing business. When they diverge significantly — particularly when EBITDA is materially higher than operating cash flow — the difference is being absorbed by something: working capital growth, capitalised costs that should be expensed, or simply poor cash collection.
Calculate this ratio for each of the last three years. A cash conversion ratio (operating cash flow divided by EBITDA) consistently below 0.7 is a significant red flag. A ratio that is deteriorating year on year — even if it started at a healthy level — is a business whose cash generation is becoming less efficient relative to its reported earnings.
The Debtor Book: Where the Most Common Problems Live
The trade debtor balance — money owed to the business by its customers — is one of the most commonly manipulated line items in a set of accounts presented for sale. Not always fraudulently, but through timing, through generous revenue recognition, or simply through poor collections discipline that inflates the apparent revenue of the business in ways that do not translate into cash.
Debtor days trending upward
Debtor days is calculated as (trade debtors / revenue) x 365. It measures how long, on average, it takes the business to collect from its customers. A business with 45-day payment terms that is collecting in 52 days is performing adequately. The same business collecting in 78 days has a collections problem — money is going out to suppliers before it is coming in from customers, which pressures cash flow and may indicate that some of the debtor book is not actually recoverable.
More importantly: a debtor days figure that is trending upward over three years tells a story independent of its absolute level. A business that collected in 48 days three years ago, 58 days two years ago, and 71 days last year has a deteriorating collections performance — or a deteriorating quality of customer. Both matter for the buyer.
The aged debtor report
Request an aged debtor report as one of the first items in the due diligence information request. The aged debtor report shows the debtor book broken down by age — current (within payment terms), 30 to 60 days overdue, 60 to 90 days overdue, and 90 days or more overdue. The older the debt, the lower the probability of collection.
A debtor book where 25% or more of the balance is more than 60 days overdue is a red flag. A debtor book where a single large balance — perhaps representing one significant customer — is more than 90 days overdue needs an immediate explanation. In the worst cases, this represents a customer dispute, a customer in financial difficulty, or revenue that was recognised in the accounts but which the seller already knows will not be collected.
Revenue recognised but not yet invoiced
In some businesses — particularly those with long-term contracts, project-based work, or complex delivery milestones — revenue is recognised before a formal invoice has been raised. This accrued income sits on the balance sheet as a debtor equivalent but has not yet been invoiced and may not yet be contractually due.
Accrued income is not inherently problematic — but a rapidly growing accrued income balance, particularly in the final months before a sale, is a warning sign that revenue recognition may be being accelerated to present a stronger recent earnings picture than the underlying cash performance supports.
The Creditor Position: The Other Side of the Working Capital Story
Trade creditors — money the business owes to its suppliers — are the other side of the working capital story. A business that is extending its payment terms to suppliers, paying more slowly than it used to, may appear to have good cash flow — but the creditor balance is growing, which represents a future cash commitment that the cash flow statement does not fully capture.
Creditor days trending upward
Creditor days — (trade creditors / cost of sales) x 365 — measures how long the business takes to pay its suppliers. Like debtor days, the absolute level matters less than the trend. A business paying suppliers in 45 days is not inherently more or less healthy than one paying in 60 days. A business that was paying in 35 days three years ago and is now paying in 65 days has been extending its creditor payment terms — either deliberately to manage cash flow, or because it is struggling to pay on time. Both deserve investigation.
The specific concern: a business that has been extending creditor days in the period before a sale may be presenting a stronger cash position at year end than is genuinely sustainable. Under new ownership, if supplier relationships require a return to normal payment terms, the cash impact will be significant.
Concentration in creditors
Look at the creditor book for concentration. A business where a single supplier represents a disproportionate share of the creditor balance may have a preferential relationship that includes extended payment terms — terms that may not automatically transfer to a new owner. Or it may represent a disputed invoice that has not been paid and which a new owner will be required to address.
Revenue Quality Signals in the Accounts
The last quarter revenue spike
One of the most consistent patterns in accounts presented for sale is an acceleration of revenue in the final quarter of the last financial year. Sometimes this is genuine — a strong trading period, a significant new customer, a seasonal pattern that falls at year end. But it is also one of the most common ways to inflate the headline revenue and EBITDA figures on which a sale multiple will be calculated.
When the last quarter's revenue is materially above the average of the preceding quarters — particularly when there is no obvious seasonal or commercial explanation — ask for the monthly management accounts that cover that period. The specific customers, the specific invoices, and the specific timing of revenue recognition in that quarter need to be understood before you accept the year-end figure as representative.
Exceptional items that recur
Exceptional items — costs excluded from the headline EBITDA on the grounds that they are non-recurring — are a standard feature of any normalised earnings presentation. The red flag is exceptional items that appear in multiple years under different descriptions. A redundancy cost in year one. A legal dispute cost in year two. A system implementation cost in year three. Each presented as non-recurring. But the aggregate effect is that the normalised EBITDA is consistently £50k to £100k higher than the underlying cost base supports.
Build a bridge from reported profit to normalised EBITDA for each of the last three years. List every adjustment made in each year. If the adjustments are consistently in one direction — upward — and if the items recurring under different names are adding up to a meaningful annual run rate, the normalised EBITDA figure being used for valuation purposes is probably overstated.
Capitalised costs that should be expensed
Some businesses capitalise costs that most accountants would expense — development costs, software licences, certain marketing costs, preliminary project costs — adding them to the balance sheet as intangible assets rather than running them through the P&L. The effect is to inflate reported profit and EBITDA in the short term, at the cost of depreciation or amortisation charges in subsequent years.
Check the intangible asset balance and the movement in it over time. A rapidly growing intangible asset balance — particularly for a business that does not have an obvious R&D or product development programme — warrants close scrutiny. Ask for the accounting policy note and the detailed breakdown of what has been capitalised and over what period it is being amortised.
Balance Sheet Signals That Tell a Story
Director loan accounts
A director's loan account represents money owed either to or from the director by the company. A debit balance — where the company owes the director money — is relatively benign; it typically represents unpaid salary or expenses. A credit balance — where the director owes the company money — is more concerning, and a large, long-standing credit balance needs a clear explanation.
Director loan accounts are one of the most common routes by which personal expenditure is processed through a business. A large balance that has been accumulating for several years, with no clear plan for repayment, is both a due diligence issue and a potential tax issue — HMRC has specific rules about director loan accounts and the tax treatment of outstanding balances.
Provisions and contingent liabilities
The notes to the statutory accounts are where contingent liabilities — potential future obligations that are not yet certain enough to be recognised as definite liabilities on the balance sheet — are disclosed. These include ongoing legal disputes, potential tax assessments, warranty provisions, and pension obligations. In a share purchase, the buyer inherits responsibility for these contingent liabilities as part of the company they are acquiring.
Read the notes carefully. An experienced buyer's solicitor will review them as part of legal due diligence. But the buyer should read them first and understand what they contain before any formal process begins. A contingent liability that appears to have been dormant for several years may be worth investigating — both for its own sake and for what it reveals about the company's legal history.
Pension obligations
Defined benefit pension schemes — legacy obligations that are now relatively unusual in SME businesses but still exist in some owner-managed companies of a certain age — can represent material liabilities that are not obvious from the headline accounts. A company with a defined benefit scheme has an obligation to fund it to a level that depends on actuarial assumptions about future investment returns, inflation, and member longevity. When those assumptions change — as they have in recent years with interest rate movements — the deficit can change significantly.
If the target business has any defined benefit pension scheme, however small, this needs specialist actuarial review as part of the due diligence process. The buyer who discovers a significant pension deficit after completion has an obligation they did not price into the deal.
The Accounts as a Narrative — Not Just Numbers
The most important skill in reading a set of accounts for acquisition purposes is not the ability to calculate ratios. It is the ability to read the accounts as a narrative — to ask, at each point, whether the story the numbers are telling is consistent with the story the seller is telling, and to identify the specific places where those two stories diverge.
Every divergence is a question. Most questions have good answers. Some do not. The ones that do not have good answers are the ones that either need to be resolved before you proceed, reflected in the price if you do proceed, or used as the basis for a structured deal that protects you against the risk they represent.
The pattern recognition described in this post comes with experience. But it can be accelerated significantly by reading accounts with a specific and disciplined analytical lens — and by using the Due Diligence Red Flag Checklist as a structured framework that ensures none of the key areas are overlooked.
Download the Due Diligence Red Flag Checklist at www.DealwiseAdvisory.co.uk
Contact Steve at [email protected] to discuss the financial analysis of a specific deal
WhatsApp Steve on +44 7930-857243
