Warranty & Indemnity (W&I) Insurance Explained

Key takeaways

In a sale, the seller gives the buyer warranties — promises that the business is what it claims to be — and stands behind them with an indemnity. Warranty & indemnity (W&I) insurance (US: reps and warranties insurance, RWI) moves that indemnity off the seller and onto an insurer. The buyer claims against a policy, not against the person who sold them the company
Almost every policy is buy-side: the buyer is the insured, even though the warranties are the seller's. That structure is what lets a PE seller cap its own liability at a token £1 — a nil-recourse deal — so the fund can distribute sale proceeds to its LPs immediately instead of leaving cash trapped in an escrow for years
The economics are small relative to the deal: a one-off premium of roughly 1% of the cover limit, cover usually set at 10–30% of enterprise value, and a retention (deductible) the buyer eats before the policy responds — typically around 0.5% of EV and often tipping lower over time. Approximate, and market-dependent
The policy is not a substitute for diligence — it is built on it. Underwriters read the buyer's QoE, legal and tax reports and hold an underwriting call, and they will not insure a risk the diligence already found. Known issues, the price-adjustment mechanism and forward-looking statements are excluded — which is exactly what the interview question is testing

The Indemnity Used to Sit With the Seller — Now It Sits With an Insurer

When a company is sold, the buyer cannot verify everything, so the seller fills the gap with warranties: contractual statements in the SPA that the accounts are true, the tax has been paid, the contracts are valid, there is no undisclosed litigation. If a warranty turns out to be false and the buyer suffers loss, the seller pays — that is the indemnity, and it is the seller's liability for having sold something other than what it described.

For a trade seller that liability is a cost of doing the deal. For a private equity seller it is a structural problem. A fund that sells a portfolio company wants to return the cash to its limited partners and close the fund, not sit on a contingent liability for two years against the day a buyer claims. The traditional fix — leaving part of the price in escrow — does exactly what the fund is trying to avoid: it traps capital that LPs are waiting on.

W&I insurance dissolves the conflict by inserting a third party. The seller still gives the warranties, but the recourse for a breach is redirected to an insurer, and the seller's own exposure shrinks to almost nothing. The buyer is protected, the seller is clean, and the price the seller actually keeps is no longer hostage to a claim that may never come.

What the Policy Covers: Loss From a Breach of Warranties the Buyer Did Not Cause

The standard product is a buy-side policy, and the asymmetry in that name is the thing to understand. The warranties are given by the seller, but the policy is taken out by the buyer, who is the insured. If a warranty is breached, the buyer claims against its own insurer for the loss, and the seller is never in the firing line at all.

That structure is not an accident of paperwork — it is what makes the clean exit possible, and it changes the buyer's incentives in a way that matters on a sponsor deal. Under a traditional indemnity, a buyer who discovers a problem has to sue the seller. After a PE deal that often means suing the management team that rolled over and now runs the company you just bought. A buy-side policy turns an adversarial claim against your own people into an insurance claim against a third party — a far more comfortable place to be.

Buy-side vs sell-side: why one dominates A sell-side policy insures the seller against having to pay out on its own warranties — useful, but the buyer still has to claim against the seller first, so the cash is still in play. A buy-side policy lets the buyer claim directly against the insurer, removing the seller from the chain entirely. Because that is what enables the nil-recourse exit a PE seller wants, the buy-side policy is the market standard — and in many auctions the seller arranges it and "staples" it to the process for bidders to take over.

Coverage is broad — the full warranty set, plus the tax indemnity — but it is not unlimited, and the limits are where the economics start.

The Economics: Roughly 1% of Cover, and a Retention the Buyer Eats First

The cost of a W&I policy is modest set against the deal it protects, which is much of why it spread so fast. Three numbers define it: the cover limit, the premium, and the retention.

1. Cover limit: ~20% of EV. On a £350m deal the buyer rarely insures the full price — most losses are a fraction of it — so cover is set at a portion of enterprise value, commonly 10–30%. At 20% that is a £70m limit, the maximum the policy will pay across all claims.

2. Premium: ~1% of the limit. The premium is a one-off, quoted as a rate-on-line — a percentage of the cover, not of the deal. At roughly 1% of a £70m limit that is about £700k, paid once at signing. In the hot market of 2021 rates pushed past 1.5%; in the softer market since they have fallen back toward 1% or below. Approximate.

3. Retention: ~0.5% of EV. The policy does not pay from the first pound. The buyer absorbs an initial layer of loss — the retention or excess — typically around 0.5% of EV (here ~£1.75m), often "tipping" to a lower level or to nil after an agreed period. Below it sits a per-claim de minimis threshold that filters out trivial claims entirely.

~£700k One-off premium to insure £70m of warranty cover on a £350m deal at roughly 1% rate-on-line — about 0.2% of enterprise value to take the indemnity off the seller's balance sheet entirely. Against a deal of that size, the price of a clean exit is a rounding error

The retention is the part students miss, because it quietly answers a question the headline cover does not: who pays for the small stuff. The answer is the buyer, every time, before the insurer is troubled — which is the insurer's way of making sure the buyer still cares about the diligence it just did.

The £1 Indemnity: Why a PE Seller Pays to Cap Its Own Liability at a Pound

The reason W&I now sits on the large majority of sponsor exits is a single structure it makes possible: the nil-recourse, or "£1 indemnity", deal. The seller gives the warranties as normal, but its liability under them is capped in the SPA at a token amount — one pound. All real recourse runs to the insurer. The seller has promised, but cannot be made to pay.

For a fund this is the whole point. With liability capped at £1, there is no contingent exposure to provision against and no reason to hold cash back, so the fund distributes the full proceeds to its LPs at completion and moves on. In a market where LPs are already starved of distributions — the same DPI drought driving continuation funds — the ability to return cash now rather than in two years is not a convenience, it is a selling point of the exit itself.

Insider tip The £1 cap does not mean the seller stops caring about the warranties — it means the seller stops fearing them. But there is one crack the cap does not cover: seller fraud. A buy-side policy will pay the buyer even where the seller lied, but the insurer then keeps the right to pursue the seller for that fraud — subrogation. So nil-recourse protects an honest seller completely and a dishonest one not at all, which is precisely the line the insurer wants to draw.

What the Policy Will Not Pay: Known Risks, the Price Adjustment, and Promises About the Future

A W&I policy is narrower than its broad coverage suggests, and the exclusions are where deals come unstuck. The governing principle is simple: insurance covers the unknown. Anything the diligence already found, the policy will not touch.

That makes known issues the first and largest carve-out. If a risk is disclosed in the data room or flagged in a diligence report, it is known — and a known risk is a negotiation over price, not a matter for insurance. The same logic excludes forward-looking statements: the policy insures that the accounts are true, not that the budget will be hit. A missed forecast is not a breach of warranty, and no insurer will write it.

The standard exclusions Known issues — anything in the disclosure or diligence reports, which belong in the price. The purchase-price adjustment — the completion-accounts true-up or locked-box leakage claim is a pricing mechanism, not a warranty breach, so it is excluded. Forward-looking statements — forecasts and projections. Specific risks the underwriter prices out: certain secondary tax and transfer pricing, pension underfunding, environmental and condition-of-assets, depending on the deal and the diligence behind them.

The price-adjustment exclusion is the one candidates trip over, because it draws a hard border between two clauses that feel similar. The pricing mechanism trues up the cheque for net debt and working capital; the warranties stand behind the truth of the accounts. W&I sits only on the second — which is exactly why the locked-box and completion-accounts machinery still has to do its own job.

Underwriting Runs on the Diligence — Which Is Why a Thin QoE Costs Cover

The most misunderstood thing about W&I is that it does not replace diligence — it is underwritten on it. An insurer does not investigate the target itself. It reads the buyer's reports — the QoE, the legal and tax due diligence, the commercial work — and holds a structured underwriting call where it interrogates the deal team on what those reports found and how hard they looked.

The consequence is direct and it surprises people: weak diligence buys weak cover. Where a report is thin, the underwriter does not assume the best — it excludes the area, narrows the warranty, or raises the rate. A scope gap in the QoE becomes a gap in the policy, because the insurer will only stand behind warranties that someone has actually tested. Good diligence is not just risk management on a deal; it is the thing that makes the warranties insurable at all.

Common mistake Treating W&I as a way to cut diligence. The logic feels plausible — why pay analysts to dig if an insurer carries the risk? — and it is exactly backwards. The insurer prices and scopes the policy off the diligence, so cutting the work does not transfer the risk; it strips the cover and hands the gap straight back to the buyer through an exclusion. W&I rewards thorough diligence and punishes thin diligence, which is the opposite of what the shortcut assumes.

The process tracks the deal: a non-binding indication early, then a paid underwriting fee — roughly £25–50k — to take the chosen insurer through the reports and the call, then the policy binds at signing. The fee survives even if the deal dies, which is the insurer's price for doing the work.

Synthetic Warranties: Insuring a Promise No One Will Make

The structure has a frontier worth knowing, because it shows how far the risk transfer can go. On some deals the seller will give few warranties or none — a fund with no operational knowledge of a business, or a distressed or insolvency sale where there is no creditworthy seller to stand behind anything. The natural answer is no warranties, and therefore nothing to insure.

A synthetic W&I policy breaks that deadlock. The warranties are written into the policy itself and given by the insurer to the buyer, rather than by a seller who refuses to give them. The buyer gets the protection it needs to do the deal, and the seller gives nothing at all. It is more expensive and more heavily underwritten — the insurer is now writing the warranty rather than backing someone else's — but it lets deals happen that otherwise could not, which is the clearest illustration of what the product is really for.

How This Is Tested: "Why Would a Buyer Pay to Insure the Seller's Promises?"

The question discriminates because it has an apparent paradox built in: the buyer pays the premium to protect itself against warranties the seller gave. A candidate who cannot resolve that has not understood the structure. The weak answer says W&I "covers warranty breaches". The strong answer explains why the buyer is the one buying.

Interview framing Lead with the paradox and resolve it: the buyer pays because the buyer is the one who needs to be able to recover without suing the management team it now employs — a claim against an insurer is cleaner than a claim against your own people. Then take the seller's side: a PE seller will happily see the buyer insured, and even arrange and staple the policy, because nil-recourse lets the fund distribute proceeds to LPs immediately instead of trapping them in escrow. Then show the limits — name the exclusions, especially that the price adjustment and known issues are carved out, so the locked-box or completion-accounts mechanism still does its own job. Close on the diligence link: the policy is underwritten on the QoE and legal reports, so thin diligence means thin cover. Naming the escrow problem, the £1 cap and the price-adjustment exclusion unprompted is what signals you have seen a real deal.

The Verdict: A Policy That Buys a Clean Exit, Not a Way Out of Diligence

W&I insurance is, at bottom, a tool for moving a liability to the party best able to bear it. The seller wants out clean; the buyer wants recourse without an adversary; an insurer will hold the risk for around 1% of the cover. The policy reroutes the indemnity through that insurer and lets a fund cap its own exposure at a pound, which is why it now sits on the large majority of mid-market European buyouts rather than the minority it was a decade ago.

For a student the lesson is what the product does not do. It does not insure a bad business, a missed forecast, a known problem or a price-adjustment dispute, and it does not let a buyer skip the work — it is underwritten on that work and gets worse as the work gets thinner. W&I is not a substitute for understanding a deal. It is what a well-diligenced deal buys to make the exit clean.

Careers: An Associate Owns the Underwriting Call and the Exclusions

On a live deal W&I is not the lawyers' private business — the deal team is in it. An associate helps the broker scope the cover, sits on the underwriting call to walk the insurer through the QoE and the model, and — most consequentially — reads the policy's exclusions against the diligence to find the risks that have quietly fallen between the report and the cover. Those gaps do not disappear; they sit with the buyer, so spotting them before signing is the job. The premium and retention then feed the LBO model as deal costs, small but real, on the sources-and-uses.

Anyone can say W&I insurance "covers warranty breaches" — that is the brochure. The judgement is knowing what it is for: that it exists to let a seller exit clean and a buyer recover without suing its own management, and that it works only on top of diligence it never replaces. The policy does not carry the risk a thin QoE missed — it carves that risk out and hands it back. Reading the exclusions, not the cover, is what tells you whether the buyer is actually protected — and that is the difference between someone who has seen a deal and someone who has seen a glossary.

Take Your Preparation Further

W&I sits on top of the diligence and pricing machinery, so read it alongside the pieces it plugs into. Start with Quality of Earnings, since the QoE is one of the reports the policy is underwritten on, then Locked-Box vs Completion Accounts, because the price-adjustment mechanism W&I excludes is exactly what those mechanisms govern. For where the indemnity sits in the deal, The M&A Process maps signing to completion, and PE Secondaries covers the distribution pressure that makes a clean, nil-recourse exit so valuable. For where the premium lands, the LBO model.

For the process map this product plugs into, download our free M&A Process Cheat Sheet, and for the full set of PE interview questions and model answers — including how to reason about deal mechanics under pressure — see the PE Interview Masterclass.

Ready for personalised feedback? Book a 1-on-1 mentoring session with an experienced IB/PE professional.

Warranty & Indemnity Insurance Explained: How PE Sells With a £1 Indemnity and Hands the Deal Risk to an Insurer