How to Structure a Business Acquisition Deal UK: FCF Calculator Guide
Most buyers structure their first acquisition deal around the wrong number. They anchor on EBITDA because that's what brokers quote, what trade press articles reference, and what sounds sophisticated in a negotiation. It isn't the right number. Your offer formula is FCF × Multiple + Net Assets − Unsecured Debt. Seller finance, asset-backed lending, debt service testing: all of it flows from that baseline. Walk through the full structure here: how to calculate FCF, how to set the right multiple, how to layer in finance, and how to test whether the deal actually works before you sign anything.
Why FCF, Not EBITDA?
EBITDA flatters the business. FCF tells you what you actually take home.
EBITDA strips out interest, tax, depreciation and amortisation, which sounds rigorous until you realise it ignores the owner's salary, working capital movements, and actual cash tax. In owner-managed SMEs, the owner's wage is often set artificially low or absent entirely, meaning EBITDA can look strong while real cash generation is a fraction of what's quoted.
Free Cash Flow is profit after all costs: a market-rate salary for whoever will run the business, corporation tax at the applicable rate, and any recurring capital expenditure the business needs to maintain itself. It's what hits the bank account. It services your acquisition debt.
Brokers price on EBITDA multiples, typically 4–7× for SMEs, because it makes listings look more attractive. Buyers who pay on EBITDA multiples without restating to FCF regularly overpay by 30–60%. Buy on FCF multiples. Sell years later on EBITDA multiples. The arbitrage between those two metrics is where the wealth creation happens.
The FCF Offer Formula: How It Works
Three components: income value, asset value, liability deduction.
Offer = (FCF × Multiple) + Net Assets − Unsecured Debt
Break that down in practice:
FCF × Multiple — the income component. Valuing the business's ability to generate cash. For SMEs under £500k EBITDA, use a range of 1× to 3× FCF. Start at 1× as your baseline for a straight, no-complications deal. Move toward 3× only when there's a strong recurring revenue base, long-term contracts, and a genuine management team that means the business doesn't depend on the owner.
Net Assets — property equity, machinery, vehicles, stock, debtors, and cash held in the business. These are added to the income value. Cash in the company's bank can be bought at a 10% discount, as it's more tax-efficient for the seller to transfer it this way than to extract it as a dividend before sale.
Unsecured Debt — deduct all of it. Bounce back loans, director loans, credit card balances, trade creditors. Non-negotiable. You're not paying income multiples on cash that's already been consumed and turned into liabilities on the balance sheet.
Example:
| Line | Figure |
|---|---|
| Annual FCF | £180,000 |
| Multiple applied | 2.5× |
| Income value | £450,000 |
| Net assets (machinery + stock + debtors + cash) | £120,000 |
| Unsecured debt (bounce back loan + trade creditors) | −£55,000 |
| Total offer | £515,000 |
That's the number you take into negotiation. Not what the broker says. Not a comparable multiple from a trade press article. Your number, based on the actual cash the business generates.
Setting the Right Multiple: 1× to 3× FCF
The multiple is a risk premium, not an aspiration.
Every variable that makes the business riskier justifies a lower multiple. Every variable that de-risks it earns you more headroom to move toward 3×. Here's how to score it:
Factors that push toward 1×:
- Single owner-operator, no management depth
- Customer concentration — one client accounts for >30% of revenue
- Business in a cyclical or discretionary sector
- Owner unwilling to stay for any handover period
- No formal contracts with major clients
Factors that push toward 2–3×:
- Management team in place that runs day-to-day operations
- Recurring revenue or contracted income (maintenance contracts, subscriptions, retainers)
- Diverse customer base — no single client above 20% of revenue
- Asset-rich balance sheet providing security for lenders
- Business has traded 10+ years with stable or growing FCF
But those deals were often driven up by competitive bidding and EBITDA-based pricing. Direct-to-vendor, off-market deals should never be priced the same way. Find the seller before the broker does, and you have no competition.
Deal Structure: How to Layer the Finance
The structure is how you pay the formula figure, and it's where the real creativity lives.
Getting to the right offer number is step one. Step two is constructing a funding stack that lets you close without putting your life savings on the table. Worth saying plainly: getting this layering right takes longer than most people expect. These are the main layers, in order of preference:
1. Seller Finance (Deferred Consideration) The seller acts as the bank. Part of the purchase price, typically 30–70%, is paid from future profits over 3–5 years. Cornerstone of low and no money down acquisition. Seller finance aligns the seller's interest in a clean handover, reduces your upfront cash requirement, and signals genuine confidence from the seller in the business they're selling. A seller who refuses any form of deferred consideration should be treated as a red flag: they don't believe in the business's future cash generation.
2. Asset-Based Lending Machinery, vehicles, plant and equipment, inventory, and property equity can all be borrowed against. Buying a manufacturing business with £200,000 of plant on the balance sheet? An asset lender will advance a percentage of that value to fund part of the deal, entirely independent of your personal balance sheet.
3. Invoice Finance For businesses carrying debtors, services firms, B2B suppliers, anyone with 30–90 day payment terms, invoice finance lets you access 90–95% of outstanding invoice value at the point of takeover. In a business with £300,000 of receivables on completion day, that's a meaningful chunk of the funding stack available immediately.
4. Growth Guarantee Scheme (GGS) The GGS supports term loans, overdrafts, asset finance, and invoice finance up to £2m with a 70% government-backed guarantee. Administered by the British Business Bank, it was extended to 31 March 2030 in the 2025 Spending Review. The guarantee sits with the lender, not you: you remain 100% liable for the debt.
5. External Equity Investor An investor provides the down payment in exchange for a minority equity stake, structured with a defined buyback timeline. Use this as a last resort because it dilutes ownership, but it can unlock deals where the other layers aren't sufficient.
Debt Service Testing: The Critical Check Before You Sign
If the deal can't service its own debt, the structure is wrong. Full stop.
Most first-time buyers skip this test. That's the reason deals collapse after completion. The rule is simple:
EBITDA − Total Annual Debt Service = Residual Free Cash
Residual free cash must cover working capital fluctuations, emergency maintenance, your drawings, and ideally a 20–30% safety buffer. If it doesn't, the structure is too aggressive.
Worked example using the deal above (£515,000 offer):
| Debt element | Amount | Annual repayment |
|---|---|---|
| Seller finance (£300,000 @ 5% over 4 years) | £300,000 | ~£83,000 |
| Asset finance (£80,000 facility) | £80,000 | ~£22,000 |
| GGS term loan (£60,000 @ 8% over 5 years) | £60,000 | ~£15,000 |
| Total annual debt service | ~£120,000 |
Business FCF: £180,000 Annual debt service: £120,000 Residual: £60,000
That's a 33% buffer, tight but workable for a business with stable recurring revenue. If the residual were £15,000, the structure would be too thin. Renegotiate the price, extend repayment terms, or walk away.
Lenders are active and appetite for acquisition finance is strong. They will stress-test your debt service cover, so run the numbers yourself first.
How to Use the ExitLeads Deal Calculator
The ExitLeads deal calculator runs the FCF formula and debt service test in one place, so you're working with live numbers, not back-of-envelope estimates.
The ExitLeads deal calculator lets you input the target business's FCF, choose your multiple, add the net asset components (plant, stock, debtors, cash), and deduct unsecured liabilities. It outputs your maximum offer figure and automatically runs the debt service test against the repayment structure you specify: seller finance terms, any external debt, and the resulting residual cash.
What makes it genuinely useful is that it forces you to work through every component before you're sitting across the table from a seller. You arrive knowing your number with precision. You know the ceiling on seller finance repayments the business can absorb. You know which multiple is defensible given the risk profile you've scored.
Run it before you make any approach. Revisit it after you've seen the management accounts. Numbers almost always shift once you get into the detail, and having the model built means you can rerun it in minutes rather than starting from scratch.
Deal Structure Scoring Framework: Before You Make an Offer
Use this checklist to validate a deal structure before submitting Heads of Terms. Every "No" either justifies a lower multiple or requires a structural fix.
| # | Check | Yes / No |
|---|---|---|
| 1 | FCF calculated from verified accounts (not EBITDA proxy)? | |
| 2 | Owner's market-rate salary accounted for in FCF? | |
| 3 | Net assets independently verified against asset register? | |
| 4 | All unsecured debt identified and deducted from offer? | |
| 5 | Multiple justified against customer concentration, management depth, contract tenure? | |
| 6 | Seller finance agreed for minimum 30% of offer price? | |
| 7 | Annual debt service leaves 20%+ residual FCF buffer? | |
| 8 | Business credit checked — no CCJs that would block finance? | |
| 9 | Asset-based lending explored against balance sheet? | |
| 10 | GGS eligibility checked if external term debt is required? |
A clean pass on all ten gives you a fundable, structured deal. Red flags on items 1, 6, or 7 mean go back and renegotiate before you proceed.
Frequently Asked Questions
What's the difference between FCF and EBITDA in an acquisition? EBITDA excludes interest, tax, depreciation and amortisation. FCF goes further: it also accounts for the owner's salary, working capital, and actual cash taxes. For SME acquisitions, FCF is the only reliable measure of what the business can generate and distribute. Paying on EBITDA multiples without restating to FCF consistently leads to overpayment.
What FCF multiple should I pay for a small UK business? For SMEs under £500k EBITDA, target a range of 1× to 3× FCF. The baseline is 1×. Moving toward 3× is only justified when the business has genuine management depth, recurring revenue, long-term contracts, and a diverse client base. Never exceed 3× FCF on a sub-£500k business: the risk-adjusted return doesn't support it.
How much should the seller finance in a UK acquisition deal? There's no fixed rule, but 30–50% deferred consideration is standard in well-structured UK SME deals. A seller willing to finance more than 50% is signalling strong confidence in the business's forward cash generation, which is a positive signal. A seller refusing any seller finance should prompt deeper scrutiny of why they want all cash up front.
What is the Growth Guarantee Scheme and can I use it for an acquisition? The GGS is a government-backed lending scheme administered by the British Business Bank, providing lenders with a 70% government guarantee on facilities up to £2m. Covering term loans, asset finance, and invoice finance, it was extended to March 2030 in the 2025 Spending Review. The GGS can form part of an acquisition funding stack, but you remain 100% liable for repayment: the guarantee belongs to the lender, not you.
Among the 74,711 verified UK acquisition targets tracked by ExitLeads, the average company has been trading for 14.5 years with an average oldest director age of 59.6, meaning there are thousands of profitable, established owner-managed businesses approaching a natural exit point right now, many of them before they've spoken to a broker. Those are the deals worth finding: sellers who haven't yet had an EBITDA-inflated asking price put in their heads. Explore the ExitLeads database to identify motivated sellers in your target sector before the market does, and use the deal calculator to structure your approach before you make contact.