Completion Accounts Explained for Business Owners

Completion accounts are the bit of a deal that can change the final price after completion, even when buyer and seller thought they had agreed the number already. In plain English, they are used to compare the business’s actual cash, debt, and working capital at closing with the figures assumed in the deal, then adjust the price up or down if needed.

For UK business owners buying or selling a company, that matters because it affects the real money changing hands, not just the headline price in the sale agreement. Completion accounts are common in share sales and wider M&A deals, especially where both sides want the final price to reflect the company’s true position on the day the deal completes. If you want a clearer picture of how value is worked out before those negotiations start, see how to determine the value of your UK SME.

If you’re planning a sale, acquisition, or share transfer, the key is knowing what can move the price, and why.

Let’s break down how completion accounts work, where they catch people out, and what you should watch before you sign.

How Completion Accounts Work in M&A

Completion accounts are the mechanism that turns an estimated deal price into a final one. The buyer and seller agree a headline price when the share purchase agreement is signed, but that figure is usually based on expected cash, debt, and working capital. Once the deal completes, the accounts are prepared using the actual numbers on completion day, and the price is adjusted if the business is better or worse than expected.

That is why completion accounts matter so much. They are not a footnote. They decide whether the seller keeps the full price, hands some back, or receives an extra payment. In many SME transactions, this adjustment can move the final outcome by a meaningful amount.

The Headline Price vs. The Final Price

The headline price is the number everyone negotiates first. It gives both sides a starting point, but it is often built on estimates, management accounts, or assumptions about the business’s financial position at completion.

The final price is different. It reflects the actual figures once the completion accounts are done. If the business has more cash than expected, or less debt, the seller may receive a top-up. If working capital is weaker than agreed, the buyer may pay less.

Think of it like buying a house and then discovering what was really in the fixtures, fittings, and cupboards after exchange. The agreed figure is not always the finished figure.

A simple example makes this easier to picture:

• Headline price agreed at signing: £2,000,000
• Completion accounts show £80,000 less cash than expected
• Final price is reduced to £1,920,000

If the same deal had shown extra cash or lower debt, the final price could have moved upwards instead.

The key point is simple, the price in the SPA is not always the price that finally changes hands.

What Gets Measured in Completion Accounts?

The main focus is the balance sheet at completion. The usual items are cash, debt, and working capital, because these are the figures that most directly affect what the buyer is actually acquiring.

Cash matters because it is part of the value the buyer receives. Debt matters because it reduces what the business is worth on a net basis. Working capital matters because the buyer needs enough day-to-day funding to keep the company trading normally after completion.

Depending on the deal, the completion accounts may also include extra items such as:

• Intercompany balances
• Corporation tax provisions
• Accrued expenses
• Inventory adjustments
• Provisions for disputes or warranties

The exact list depends on the share purchase agreement and the accounting policies both sides agree upfront. That is where the detail matters. If the drafting is loose, the argument usually starts later, when the money is already at stake.

If you want the deal price to reflect the real balance sheet position, the accounting basis has to be clear. That is why the equity bridge and working capital price adjustments should be understood early, not after everyone has signed.

Why Are Completion Accounts Used?

Completion accounts are used because a deal signed on paper is not always the same as the business on completion day. Cash moves, debt changes, stock levels shift, and working capital can tighten or swell between signing and completion. The final price needs a mechanism that catches those changes instead of pretending they never happened.

That matters in practice. If you are buying or selling a company, the agreed price should reflect the business as it actually stands, not the version everyone hoped for a few weeks earlier. For many owners, this sits alongside the wider business valuation methods for UK SMEs process, where assumptions are tested before the deal price is set.

Completion accounts are there to stop the final price drifting away from the real numbers.

How They Protect the Buyer

Buyers want the final price to match the true financial position of the business on completion day. That is the whole point. If cash is lower than expected, debt is higher than expected, or working capital is short, completion accounts give the buyer a proper adjustment mechanism.

Without that protection, the buyer could end up paying for value that was never really there. A business might look healthy in management accounts, but a later pay run, tax bill, or debt drawdown can change the picture fast. Completion accounts catch that gap and turn it into a price adjustment.

For a buyer, this is less about being difficult and more about paying the right amount. No one wants to buy a business based on a balance sheet that was already out of date.

How They Protect the Seller

Sellers usually want three things, certainty, speed, and a fair process. Completion accounts can give them that, but only if the rules are clear from the start. When the drafting is tight, both sides know what is being measured and how any adjustment will work.

Where things go wrong is weak wording. If the agreement leaves room for argument, the seller can face post-completion risk long after the deal has closed. That is where disputes start, and they are rarely small ones.

Clean records matter here. So does a sensible working capital assumption. If the accounts are messy or the target level is unrealistic, the seller is exposed to unnecessary pushes and pulls after completion. At Consult EFC, I see this most often where the business has not kept proper month-end discipline or has treated working capital as an afterthought.

The seller’s best protection is simple:

• Keep the books clean
• Agree the accounting policies early
• Set a fair working capital peg
• Make sure the completion accounts rules are precise

When those pieces are in place, completion accounts can work well for both sides.

The Key Terms That Shape the Final Adjustment

Once you understand the broad idea, the real work sits in the definitions. Completion accounts rise or fall on a few core terms, and each one can shift the final price in a meaningful way. That is why the drafting matters so much, because a small wording change can change the money.

The main areas to pin down are working capital, cash, debt, and the accounting rules used to measure them. If those terms are loose, the adjustment becomes a guessing game. If they are clear, the deal has a fairer landing point.

The Working Capital ‘Peg’ (Target)

Most deals set a working capital target, sometimes called a peg, so the buyer gets the business at a normal operating level. That is the point of it. The business needs enough stock, debtors, and cash-like funding to trade properly after completion, not a stripped-back balance sheet that leaves the buyer short.

The target should be based on normal trading levels, not one strong month or one poor month. A business that spikes in December and slumps in January should not have its peg set off the busiest point in the year. That is where seasonal businesses need extra care, because the wrong reference point can make the adjustment unfair before anyone notices.

If actual working capital at completion is above the target, the seller usually gets a price uplift. If it is below the target, the buyer usually pays less. It is a simple idea, but it needs a sensible benchmark. Otherwise, the working capital adjustment becomes a blunt instrument rather than a fair correction.

A practical example helps:

• Target working capital: £500,000
• Actual working capital at completion: £550,000
• Result: seller normally receives £50,000 extra

If the position were £450,000 instead, the price would usually reduce by £50,000. That is the basic logic, and it keeps the buyer whole without making the seller give away more than agreed.

2. Cash-Free, Debt-Free Adjustments

Cash and debt are usually treated as part of the final price calculation because they change what the buyer is really buying. In many transactions, the deal is structured as cash-free, debt-free, which means the buyer expects to acquire the business without surplus cash or borrowings sitting on the balance sheet.

In practice, that does not mean every liability disappears. It means the documents must spell out what counts as debt and what counts as cash, so the final adjustment is measured properly. Bank loans are the obvious example, but debt can also include overdrafts, finance leases, hire purchase balances, and sometimes unpaid taxes or other liabilities, depending on how the agreement is written.

The buyer and seller need to agree the definitions in the documents. If they do not, arguments start fast. Is deferred income debt? What about unpaid bonuses? Is a director loan a debt, cash, or something else entirely? Those questions sound small until they affect the number on the final completion statement.

If the agreement does not define cash and debt properly, the final price can turn into a fight over labels instead of facts.

Net debt is usually the cleaner way to look at it. You take cash, subtract debt, and then adjust the price accordingly. That is why the wording has to be tight. If you want the valuation support behind the numbers to stack up properly, the wider logic used in normalised EBITDA and quality of earnings often helps anchor what the business is really generating before those balance sheet items are netted off.

3. Accounting Policies and Dispute Clauses

The accounting policies used for the completion accounts must be written down clearly. If the agreement is vague, each side will read the numbers in a different way. That is when delays start, followed by frustration, then the first proper argument after completion.

Where appropriate, the completion accounts should be prepared on a basis consistent with the historic accounts. That does not mean copying old accounts blindly, but it does mean using the same accounting principles unless the deal says otherwise. Consistency matters because it stops either side from changing the rules when the price is on the line.

If there is a dispute, the SPA should say how it gets resolved. Common routes include escalation to senior people first, then referral to an independent accountant if the parties still cannot agree. That gives the process a structure instead of letting the disagreement drift.

The usual pressure points are:

• Revenue cut-off at completion
• Stock valuation
• Accruals and provisions
• Tax balances
• Classification of cash and debt items

Vague drafting is one of the main causes of delay and tension after completion. Everyone thinks they have agreed the same thing, until the first draft of the accounts lands on the table. That is why I always tell owners to sort the rules early, not when the deal has already closed and the invoices are being chased.

Common Mistakes That Delay M&A Deals

Completion accounts usually run into trouble for the same few reasons, and most of them are avoidable. The issue is rarely the concept itself, it is the paperwork, the records, and the lack of clarity around what the numbers should actually mean.

When the sale agreement is loose or the bookkeeping is messy, the final price can turn into a slog. That means more time, more back-and-forth, and more fees on both sides. If you are planning an exit, the best protection is simple, keep the numbers clean and the wording tighter than you think you need.

Vague wording in the sale agreement

Unclear drafting is one of the quickest ways to invite arguments. If the SPA does not define what is included, how items are valued, and who has the final say, each side will fill in the gaps in their own favour.

That is where terms like debt, cash, and working capital need proper definitions. So do accounting points such as whether the accounts must follow the same policies as the historic accounts, and what happens if they do not. A phrase like “normal accounting treatment” sounds neat, but it can cause a mess when the numbers are on the line.

You also want the dispute process to be clear. If the parties cannot agree, does the matter go to the buyer, the seller, an independent accountant, or someone else? If that route is not set out properly, the argument drags on before it even gets to the numbers.

Poor quality management information

Messy books make the whole process harder. Late bookkeeping, unreconciled balances, or incomplete records slow down completion accounts and push up professional costs, because someone has to rebuild the story from scraps.

Good monthly management accounts help a lot here. So do clean bank reconciliations, aged debtor and creditor reports, and up-to-date balance sheet schedules. When the records are tidy, there are fewer surprise adjustments after completion.

A buyer should not have to guess whether the numbers are solid. If the management information is weak, the final settlement often becomes a repair job instead of a straightforward calculation. That is why exit readiness for UK SMEs matters well before heads of terms are signed.

Missed deadlines after completion

The clock starts ticking as soon as the deal completes. The completion accounts have to be prepared, reviewed, and agreed within the timetable set out in the SPA.

Miss a deadline, and the whole process slows down. That can delay the final settlement and increase fees, especially if accountants are chasing missing figures or answering repeated queries. A tight timetable only works when both sides keep the information moving and respond quickly.

How to Prepare Your Business for a Clean Exit

If you want a clean exit, start before the buyer starts asking questions. The best-run sale processes are not won in the negotiation room, they are won months earlier, when the numbers are tidy, the working capital story makes sense, and the accounts hold together under pressure.

Completion accounts reward preparation. If your records are messy, you are handing the other side extra room to challenge the final price. If your financials are clean and current, you keep more control over the conversation.

Get your numbers in order early

Regular reporting makes a sale less painful because it shows the business is being run properly, not patched together at the last minute. Up-to-date management accounts, clean balance sheet reconciliations, and clear support for key balances all help the completion process run with less friction.

Do not wait until heads of terms are signed before checking the quality of your numbers. By then, the buyer is already watching closely, and any weakness in the accounts can start to affect confidence as well as price.

The main areas that need attention are usually:

• Balance sheet reconciliations so cash, debtors, creditors, and accruals are properly backed up
• Month-end discipline so the latest accounts are not stale
• Historic consistency so unusual treatments do not need explaining later
• Supporting schedules for loans, tax, stock, and related-party balances

A buyer is not just looking at profit. They want to see whether the balance sheet can survive scrutiny. That is where preparing your business for exit starts to matter, because the valuation work only really holds up when the underlying figures are clean.

Test the working capital position before due diligence

It helps to know early whether the business is likely to sit above or below the target working capital level. If you wait until due diligence is underway, you may already be in defensive mode, explaining a shortfall that should have been spotted weeks earlier.

Seasonal dips and spikes are common, especially in retail, construction, and service businesses with lumpy billing cycles. If your working capital always drops after Christmas or surges before a big contract lands, get that pattern on the table early. It is much easier to explain a known movement than to argue over a surprise.

A quick pre-sale test gives you a clearer view of where the deal may land:

Once you understand the shape of the working capital, you can explain it properly in negotiations instead of scrambling afterwards. That puts you in a far stronger position when the final accounts are drafted.

Use professional support where the numbers matter

When completion accounts can move the price, this is not the place for guesswork. Consult EFC provides independent, Chartered Accountant-led advice for owners who want to understand the valuation impact properly and protect the quality of the exit.

That matters because the numbers are not just accounting entries, they are negotiation points. Get them right early, and you are far more likely to protect your position, reduce friction after completion, and exit on cleaner terms.

For SME owners, the value of proper support is simple. It gives you a sharper view of what the business is worth, where the price may move, and which points need tightening before the deal is live. That is how you keep the sale under control, rather than letting the completion accounts control you.

Final Thoughts

Completion accounts are there to do one thing properly, make the final price reflect the business’s true position on completion day. When the definitions are clear, the accounting rules are nailed down, and the timetable is sensible, they do that job well.

When those details are vague, the whole process becomes harder than it needs to be. That is where owners get caught out, because a small drafting issue can turn into a price dispute, a delay, or both.

If you are planning a sale, get the numbers ready early and have them tested before anyone signs. For owners preparing to sell, a professional valuation for selling an SME gives you a much firmer base to work from, and it keeps the conversation grounded in facts rather than guesswork. Consult EFC helps UK business owners do exactly that, with independent support that is clear, careful, and built for real-world deals.

Kishen Patel, BFP ACA Founder, Consult EFC · ICAEW Chartered Accountant

Over 12 years across Big Four audit, Investment Banking and corporate advisory. Kishen works with UK SMEs on valuations, exit planning, fundraising and financial strategy. ICAEW regulated. Big Four trained. Based in London.