When a private equity firm buys your business, they don't pay cash from a slush fund. They put down a sliver of equity (typically 30–50% of the purchase price), borrow the rest, and use your company's own cash flow to pay back the debt. That's a Leveraged Buyout (LBO).
Understanding how the math works isn't just for PE analysts. If you're a founder or SMB owner contemplating an exit — even a strategic-buyer exit, where the buyer isn't a PE firm — the buyer is almost certainly running an LBO-style sanity check on whether the price they're offering hits their target return. Learn the math, and you negotiate from a position of knowledge.
What an LBO Actually Is
An LBO is a transaction with four mechanical elements:
1. A financial sponsor (PE firm) acquires a target company.
2. The acquisition is funded with a mix of equity (sponsor's own capital) and debt (raised against the target's cash flows).
3. Over the hold period (typically 4–7 years), the target generates cash, which pays down debt.
4. At exit, the sponsor sells the now-deleveraged company for a multiple of EBITDA, captures the equity value, and distributes returns to its limited partners.
PE firms target IRRs of 20–25%+ on their investments. The LBO model is how they figure out, ex-ante, whether a given purchase price can deliver that IRR. If the answer is no, they pass — or lower their bid until the math works.
The 4 Drivers of LBO Returns
Every dollar of return in an LBO comes from one of four sources. Understanding which driver is doing the work tells you a lot about the deal.
Debt paydown
The most reliable driver. The company uses its operating cash flow to pay down acquisition debt over the hold period. As debt falls, the sponsor's equity stake grows mechanically — even if enterprise value is flat.
Example: buy a business for $100M with $60M debt and $40M equity. After 5 years, if EV is still $100M but debt has been paid down to $30M, the sponsor's equity is now worth $70M — a 1.75× return on equity, just from deleveraging.
EBITDA growth
The most controllable driver. Sponsors look for opportunities to expand EBITDA during the hold — through organic revenue growth, cost cuts, M&A bolt-ons, or operational improvements (the famed PE "100-day plan"). A 5% annual EBITDA growth rate over 5 years compounds to ~28% of additional value.
Multiple expansion
The most speculative driver. Multiple expansion means selling the company at a higher EV/EBITDA multiple than you bought it at. This depends on market conditions, sector tailwinds, scale (bigger companies trade at higher multiples), and the strategic positioning of the business at exit.
Sophisticated PE firms never underwrite to multiple expansion — they assume flat or slightly compressed multiples at exit, and treat any expansion as upside. If a deal only works with multiple expansion, it doesn't work.
Free cash flow generation
Beyond debt paydown, any excess cash generated during the hold either pays a dividend to the sponsor (a dividend recap) or simply builds cash on the balance sheet (increasing equity value dollar-for-dollar). Asset-light businesses with high free cash flow conversion are LBO favourites for this reason.
Sources & Uses: The Starting Point
Every LBO model opens with a Sources & Uses table — a balance sheet of the transaction itself.
Uses (what the money pays for):
• Purchase price of equity
• Refinanced debt (paying off the seller's existing debt)
• Transaction fees (banker fees, legal, due diligence — typically 2–4% of EV)
• Financing fees (debt arrangement fees — typically 1–3% of new debt)
• Minimum cash on balance sheet at close
Sources (where the money comes from):
• New senior debt (term loans, revolver)
• New subordinated / mezzanine debt
• Sponsor equity
• Management rollover equity (if applicable)
• Excess cash on the target's balance sheet at close
Sources must equal Uses. The plug variable is sponsor equity — once you've sized the debt (see below) and accounted for fees, whatever's left is the equity check.
Building the Operating Model
Inside the LBO sits a full 3-statement model of the target over the hold period (5 years is standard). The mechanics are the same as any 3-statement model — see our 3-Statement Model Guide — but a few things matter more in LBO context:
• EBITDA quality. Buyers focus on "normalized" or "adjusted" EBITDA, stripping out one-time items, owner addbacks, and non-recurring expenses. The seller's negotiating goal: maximise adjusted EBITDA. The buyer's: minimise it. We cover this in our Quality of Earnings post.
• Cash conversion. EBITDA minus CAPEX minus working capital = free cash flow available for debt service. A business with 90% EBITDA-to-FCF conversion is far more LBO-able than one at 60%.
• Margin trajectory. Sponsors model in operational improvements: 100–300 bp of margin expansion over the hold. Be ready to defend whether those improvements are realistic.
Debt Schedule Mechanics
The debt schedule is the heart of an LBO model. PE deals stack multiple layers of debt — each with different rates, maturities, and seniority — and each layer is paid back in priority order.
Senior debt
Term Loan A and Term Loan B are the most common. TLA amortises (typically 5–10% per year); TLB is mostly bullet (small or no amortisation, paid at maturity). Senior debt typically represents 3–4× EBITDA, at SOFR + 300–500 bp.
Mezzanine
Subordinated debt with a higher coupon (10–15%) and often equity warrants. Sits between senior debt and equity in the capital stack. Used to push total leverage to 5–6× EBITDA in deals where senior lenders won't go that high.
Cash sweep
The defining mechanic of LBO debt: every dollar of excess free cash flow must be used to pay down senior debt. Typically 50–100% of FCF goes to mandatory prepayment in early years, stepping down as leverage ratios improve. This is what makes LBOs work — the company isn't allowed to sit on cash.
Calculating Sponsor IRR
At exit (Year 5, typically), the sponsor sells the company. The math:
5. Exit Enterprise Value = Year 5 EBITDA × Exit Multiple
6. Exit Equity Value = Exit EV − Remaining Debt + Cash
7. Sponsor's share of Exit Equity Value = (Sponsor's equity % at entry, often adjusted for management options)
8. IRR = the discount rate that makes the present value of Sponsor's exit proceeds equal to the initial equity check
In Excel: = IRR({-initial_equity, 0, 0, 0, 0, exit_proceeds}). Or use XIRR if cash flows are at non-uniform dates.
Two return metrics matter in PE: IRR (time-weighted, what LPs evaluate) and MOIC (multiple of invested capital — exit proceeds / equity check, NOT time-weighted). A typical PE deal underwrites to 2.5–3.0× MOIC over 5 years, equating to 20–25% IRR.
Why Founders Should Understand LBO Math
If you ever consider selling your business — to a PE firm, a strategic buyer who's themselves PE-backed, or via a recap — the buyer's offer is the highest price at which their LBO math still clears their IRR hurdle.
Three concrete uses for an owner-operator:
• Reverse-engineer the buyer's bid. If you know what multiple they're paying, you can back into the IRR they're underwriting. If their IRR is exactly 20%, they have no margin — push for a higher price. If it's 30%, they have room to move.
• Identify your own value drivers. Run an LBO on yourself. Find what's holding back the return: too much working capital, lumpy CAPEX, customer concentration. Fix it pre-sale and you increase the price.
• Negotiate the structure, not just the headline. Earnouts, seller notes, management rollovers, escrows — these all change the buyer's IRR materially. Understanding LBO math lets you trade dollars on the headline for better terms elsewhere.
An LBO model is the single best window into how a sophisticated buyer thinks about your business. Run it once and your negotiation IQ jumps a level.
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Run an LBO on your own business Our institutional-grade LBO Model Template includes Sources & Uses, full 3-statement integration, multi-tranche debt schedule (senior, mezz, revolver), cash sweep, sponsor IRR & MOIC, exit waterfall, and sensitivity tables. The same architecture used at top PE firms. → Download the LBO Model → |
FAQ
How much debt can a typical LBO support?
4–6× EBITDA is the standard range, depending on industry and cash flow stability. Software and recurring-revenue businesses can sometimes push to 7×; cyclical or asset-heavy businesses cap at 3–4×.
What's the difference between IRR and MOIC?
MOIC is exit-proceeds-divided-by-initial-equity — time-blind. IRR adjusts for the time it took to get there. A 3.0× MOIC over 3 years is much better than a 3.0× MOIC over 6 years; IRR captures that. PE firms care about both, but IRR is the more disciplined measure.
Can a strategic buyer also run an LBO model?
Yes — and they usually do, even if they don't use leverage to fund the deal. The LBO math gives them a floor estimate: "if a PE firm could pay X for this asset, we should be willing to pay X plus synergies." That's how strategics justify paying premiums over PE bidders.
Why do PE firms target 20%+ IRRs when public equities only return 8–10%?
Three reasons: illiquidity premium (LPs can't get their money back for 7–10 years), management fees and carry that eat into LP returns (so gross IRR must clear net-return hurdles), and the operational risk of running concentrated bets on individual companies.