Corviniti/Services/Sell-Side Due Diligence

Services / M&A / Sell-Side

Sell-Side Due Diligence

Diligence run for the seller, before the buyer runs it against you: the problems found first, the adjusted EBITDA case built on evidence, and a process where buyer diligence confirms your numbers instead of discovering problems.

We run the buyer's diligence before the buyer does, so the process depends on your analysis and nothing reprices in week nine.

Or call (347) 472-1115

Ro Sokhi, CPA, founder of Corviniti, on sell-side due diligence
Ro Sokhi Founder and CEO, Corviniti
In the press
Overview

Sell-side due diligence: the cleanup window, the vendor QoE, and preparing for buyer diligence

Key takeaways
  • What it is. Diligence run for the seller before the buyer runs it: a six-to-twelve-month cleanup window, an evidence-based adjusted EBITDA case, the data room and databook, and a prepared defense so buyer diligence confirms the numbers instead of discovering surprises.
  • Where it breaks. A problem a buyer finds mid-exclusivity is a repricing event with no competitive tension left, an add-back schedule that overreaches gets dismantled publicly, and inconsistencies between the deck, the databook, and the raw data multiply into follow-up questions.
  • How we help. We run the cleanup sweep in priority order, build the vendor QoE and databook to buy-side evidence standards, and prepare the definitions and the defense before the buyer’s team anchors its own.

Every finding a buyer’s diligence makes costs the seller twice: once in price, at the multiple, and once in credibility, which weakens every position negotiated afterward. Sell-side diligence inverts the discovery: you find the issues in private, fix what is fixable, frame what is not, and walk into the process holding the same analysis the buyer will commission, six months before they commission it.

This page covers the seller’s engagement from the pre-market window through the closing statement. The analytical core, the QoE itself, is treated in depth at quality of earnings; the buyer’s side of the same process at buy-side due diligence; and the deal mechanics at M&A advisory.

Preparation

The cleanup window and the evidence-based EBITDA case

Sellers who run diligence on themselves find the problems first and present numbers a buyer can confirm, and the work sits in a window that opens roughly a year before launch. About twelve months out, fix the books: accrual accounting, reconciliations, and cutoff, so the monthly statements the process depends on are reliable. About nine months out, normalize and document: owner compensation reset to market and every add-back supported with evidence. About six months out, build the case: the sell-side quality-of-earnings report and the databook, the supporting schedule behind every number. At launch, buyer diligence confirms the numbers instead of discovering surprises. The reason sellers do it is asymmetry of timing: finding a problem in the cleanup window is a fix, while a buyer finding the same problem in diligence is a price cut or a broken deal with no competitive tension left to discipline it. The databook is the deliverable that carries the seller through, the supporting schedule for every adjusted-EBITDA add-back, working-capital account, and net-debt item.

The sell-side cleanup window and the evidence-based EBITDA case, on a timeline before launch. Sellers who run diligence on themselves find the problems first and present numbers a buyer can confirm. Twelve months out, fix the books: accrual accounting, reconciliations, and cutoff, so the statements are reliable. Nine months out, normalize costs: owner compensation to market, and every add-back supported with evidence. Six months out, build the case: the sell-side quality-of-earnings report and the databook, the schedules behind every number. Launch: buyer diligence confirms the numbers instead of discovering surprises. Why sellers do it: finding a problem in the cleanup window is a fix; a buyer finding it in diligence is a price cut or a broken deal. The databook is the supporting schedule for every adjusted-EBITDA add-back, working-capital account, and net-debt item.
The sell-side preparation timeline. Illustrative.
The defense

Preparing for buyer diligence

A prepared seller knows what the buyer’s team will test and has the answer ready before the question. The buyer will test every adjusted-EBITDA add-back, so the seller carries evidence for each and drops the ones that cannot be supported before launch. The buyer will test whether the revenue recurs, met with cohort and retention data and the contracted revenue base. The buyer will test the working-capital level, met with a documented normal level and a defensible peg. The buyer will test net debt and debt-like items, met with a complete list so nothing surfaces late in diligence. And the buyer will test owner and related-party items, met with personal expenses identified and quantified and transition terms made clear. With the evidence ready, buyer diligence confirms the seller’s numbers, which protects both the price and the timeline, and the definitions drafted early (the EBITDA and working-capital definitions) settle most of the true-up before it starts.

Preparing for buyer diligence: what the buyer will test and the seller's prepared answer. Every adjusted-EBITDA add-back: evidence for each, and drop the ones you cannot support before launch. Whether the revenue recurs: cohort and retention data, and the contracted revenue base. The working-capital level: a documented normal level and a defensible peg. Net debt and debt-like items: a complete list, so nothing surfaces late in diligence. Owner and related-party items: personal expenses identified and quantified, and transition terms clear. With the evidence ready, buyer diligence confirms the seller's numbers, which protects both the price and the timeline.
Preparing for buyer financial diligence. Illustrative.

This is for you if

  • An exit is six to eighteen months out and nobody has looked at the books like a buyer will.
  • The addbacks are real but undocumented, and the related-party arrangements are on handshakes.
  • An auction is planned and the process needs a databook buyers can work from.
  • A buyer's diligence team is already engaged and the defense needs to exist by their first findings call.

What you get

  • The readiness sweep Issues found in the private window and converted from discounts into projects.
  • The sell-side QoE Your best supportable EBITDA, built to buy-side evidence standards, with the databook behind it.
  • Process infrastructure The data room, the metric bridges, and the controlled Q&A that spend management's time on buyers, not archaeology.
  • The prepared defense Anticipated findings pre-analyzed and the definitional positions drafted before the buyer anchors theirs.
How We Help

What we deliver

On a sell-side engagement, you get the buyer's analysis, run first, for your side.

The readiness sweepIssues found in the private window and converted from discounts into projects.
The sell-side QoEYour best supportable EBITDA, built to buy-side evidence standards, with the databook behind it.
Process infrastructureThe data room, the metric bridges, and the controlled Q&A that spend management's time on buyers, not archaeology.
The prepared defenseAnticipated findings pre-analyzed and the definitional positions drafted before the buyer anchors theirs.

When companies bring us in

  • An exit is six to eighteen months out and nobody has looked at the books like a buyer will.
  • The addbacks are real but undocumented, and the related-party arrangements are on handshakes.
  • An auction is planned and the process needs a databook buyers can work from.
  • A buyer's diligence team is already engaged and the defense needs to exist by their first findings call.
Our Experience

Where we have done this work

Engagement Notes

Sellers who walked in prepared

Sell-side engagements from readiness sweeps through full vendor QoE: cleanup windows that converted findings into fixed items, adjustment schedules built to buy-side evidence standards that became the process's reference document, and auction timelines held because buyer diligence confirmed preparation instead of discovering problems.

Engagement Notes

Founder exits, staged honestly

Owner and family-business exits prepared across the realistic arc: owner economics normalized with market evidence, related-party arrangements documented or unwound in the private window, controller functions installed for the exit year, and definitional positions drafted early enough that the true-up was arithmetic rather than a second negotiation.

The Detail

The gaps, and how we close each one

Issue 01

Why sellers run diligence on themselvesThe Case

Sell-side diligence looks like paying to be audited voluntarily, and owners resist it until they watch a deal reprice in week nine over an issue they could have fixed six months before launch. The economics favor the seller so consistently that sophisticated processes now assume it.

The treatment

The case rests on three asymmetries. Discovery timing: an issue found pre-market is a project; the same issue found by a buyer mid-exclusivity is a repricing event with no competitive tension left to discipline it, because by then the other bidders are gone and the deal fatigue is yours. Narrative control: the party that quantifies an issue first frames it, the customer concentration presented with cohort retention data is a characteristic; discovered raw in buyer diligence, it is a risk. Process speed: a prepared seller compresses buyer diligence from months to weeks, which keeps multiple bidders engaged longer, and competitive tension is worth more multiple points than any addback. The engagement shapes range from a readiness assessment (find the issues, fix quietly, no report shared) to a full sell-side QoE with a databook buyers and their lenders work from, chosen by process type: auctions justify the full product, negotiated deals often need only the readiness layer. Either way, the principle is the same one that governs all diligence: the side that has done the analysis controls how the issues are presented.

What we do: We shape the engagement to your process: a private readiness sweep or a full vendor product buyers work from.

Issue 02

The cleanup window: six to twelve months before launchPre-Market

Most value-destroying diligence findings are fixable, given time: revenue recognized casually, cutoff never enforced, related-party arrangements undocumented, personal expenses threaded through the P&L. Found at launch they reduce the price; found a year earlier they are fixable projects.

The treatment

The pre-market sweep, run in priority order: revenue recognition onto a defensible policy with the historical periods conformed, because revenue findings attack the multiple itself and buyers’ QoE teams start there (the technical layer per our ASC 606 practice); cutoff and accrual discipline installed so the monthly financials the databook will present actually hold; related-party untangling, the family payroll, the owner’s building at a handshake rent, the affiliated vendor, each moved to market terms or documented for clean normalization, since undocumented related-party flows read as findings even when innocent; personal expense hygiene, stopped prospectively (an addback with a clean recent period is credible; one that runs through last month invites the question of what else does); and the filing infrastructure, contracts findable, balances supported, the close on a calendar, which is the controller discipline applied to exit preparation. Twelve months of clean financials is the single most valuable diligence asset a seller can build, because it lets you demonstrate each normalization instead of arguing for it.

What we do: We run the pre-market sweep in priority order and build the twelve clean months that convert arguments into demonstrations.

From our engagements: Cleanup is cheapest a year before launch: every issue fixed then protects value at the multiple, and every issue left unfixed reduces value at the multiple. We would rather run this sweep eighteen months early than eight weeks late, and so would every seller who has done it the other way.
Issue 03

The sell-side QoE: the adjusted EBITDA case, built on evidenceThe Product

The sell-side QoE walks a line: it is advocacy, the seller’s best supportable EBITDA, that must survive adversarial review by the buyer’s diligence team, whose job is to break it. A schedule that overreaches gets dismantled publicly, which costs more than the inflated addbacks were worth.

The treatment

The construction discipline: every adjustment built to the same evidence tiers a buy-side team applies, contractual, transactional, asserted, with the asserted tail kept deliberately short, because every weak item reduces the credibility of the entire report (the mechanics per the QoE adjustment standards, applied from the seller’s side); run-rate adjustments presented with the completed event and the arithmetic (the signed price increase, the exited lease, the realized cost action), not the planned one; the known problems included, framed, and quantified, the customer concentration with its retention history, the margin dip with its explained cause, because an issue you present with supporting data reads as a known characteristic, while one the buyer discovers reads as a problem; and the working capital and debt-like analysis run pre-emptively, a peg proposed from the seller’s own trailing analysis before the buyer’s team anchors one from theirs. The output, the report and the databook behind it, becomes the process’s reference document: buyers diligence against it rather than from scratch, which is exactly the position the seller wants the numbers to occupy.

What we do: We build your best supportable EBITDA to buy-side evidence standards, with the known issues framed before they are found.

Exit on the horizon? Talk to us while findings are still projects, not discounts.

Talk to an Expert
Issue 04

The data room and the databook: managing the flow of numbersThe Databook

Buyer diligence is a high-volume information process: request lists in the hundreds, Q&A threads that multiply, and every inconsistency between the deck, the databook, and the raw data turning into follow-up questions. Sellers lose this phase through disorganization, not through their numbers.

The treatment

The information architecture, built before launch: a databook, monthly P&L, balance sheet, and the analytical schedules (revenue by customer, adjustment detail, NWC trends) in a consistent, tie-able package, constructed so every number traces to the trial balance and every schedule reconciles to every other, because buyers test internal consistency before they test anything else; the data room populated to the standard request list in advance, contracts, statements, payroll, tax, organized so diligence confirms preparation rather than finding disorganization; the metrics reconciled to the financials, the ARR in the deck tied to the revenue in the databook through a bridge that exists before someone asks for it; and Q&A run as a controlled process, one channel, answers reviewed for consistency with everything already provided, response times managed to keep momentum without signaling that the team is stretched. Management’s time is the scarcest deal resource, and this machinery exists to spend it on buyers and the business rather than on late-night document searches, which is exactly the strain buyers look for.

What we do: We construct the databook and data room to tie internally everywhere, and run Q&A as one controlled channel.

Issue 05

Surviving buyer diligence: the prepared defenseThe Defense

However good the preparation, the buyer’s team will produce findings, real ones, arguable ones, and negotiating positions presented as analysis, in the late-process window where the seller’s leverage is lowest and fatigue is highest. The difference between a reprice and a rebuttal is whether the defense was built in advance.

The treatment

The defense posture: every anticipated finding pre-analyzed, the sell-side work already mapped the exposure areas, so when the buyer’s QoE challenges an addback or proposes a peg, the response is the prepared schedule, not a scramble; the definitions drafted in advance, EBITDA and NWC definitions proposed by the seller’s side early, in the databook and the draft SPA, because the party that drafts the definition wins most of the true-up before it starts (the mechanics per the hub’s SPA treatment); triage discipline on the findings themselves, concede the real ones fast (disputing a correct finding weakens your credibility on the arguable ones), rebut the arguable ones with evidence, and expose the negotiating positions by asking for their support; and the closing statement rehearsed, the peg mechanics, the debt-like list, and the proration math agreed in structure before the time pressure of closing week. Sellers who prepare this layer keep deals at the letter-of-intent price far more often than sellers who improvise it.

What we do: We pre-analyze the anticipated findings and fight the definitional battles from paper drafted early.

Issue 06

Founder and owner exits: the specific realitiesFounder Exits

Founder-led sellers face diligence with books built for tax efficiency, not presentation: owner compensation set by advice rather than market, personal costs interwoven, key relationships undocumented because they lived in the founder’s head, and often no finance function above a bookkeeper. Buyers know all of this, and price the uncertainty unless it is resolved.

The treatment

The founder-exit workstream, honestly staged: owner economics normalized with evidence, compensation reset against market data for the actual role, the personal expenses cataloged and stopped, family arrangements documented, building addbacks a buyer’s team verifies rather than debates; the key-person question addressed structurally, customer and vendor relationships contracted where they lived on handshakes, the second layer of management made visible in the process, because buyers price founder dependence into both the multiple and the earnout; earnout and rollover literacy before the LOI, sellers who will hold paper or earn contingent value should understand the accounting and the measurement mechanics (the classification realities per our ASC 805 treatment) before signing terms that define them; and the finance function stood up to deal grade, often our controller layer installed for the exit year, so the monthly numbers the process depends on actually arrive monthly. A founder gets one exit; the preparation determines whether buyers see a business that runs without the founder or discount the price for founder dependence.

What we do: We stage the founder exit honestly: economics normalized with evidence, key-person risk addressed, and the finance function stood up for the year.

FAQ

Frequently asked questions

When should sell-side diligence start?

The readiness sweep belongs six to twelve months before launch, while findings can still be fixed rather than priced against you; the sell-side QoE itself typically runs in the one to two quarters before marketing. Later is still worth doing, but every month earlier is cheaper.

Do we share the sell-side QoE with buyers?

Depends on the engagement shape: full vendor diligence products are shared and become the process's reference document; readiness assessments stay private, with the fixes made quietly. Auctions favor the shared product; negotiated deals often need only the private layer.

Will buyers just redo the work anyway?

They will verify it, which is faster and friendlier than originating it: buyer teams working against a credible databook confirm and sample rather than reconstruct, compressing their timeline and keeping competitive tension alive. The work is not duplicated; it is anchored on your version.

Our books are tax-basis and the company runs through my personal life. Can this be fixed?

Yes, on the founder-exit arc: proof-of-cash-anchored rebuilds, owner economics normalized with evidence, arrangements documented or unwound in the private window, and a controller layer for the exit year. The condition is common; the mistake is starting at the letter of intent.

What does the working capital peg have to do with my price?

Everything, at the margin: the peg decides how many dollars move at close beyond the headline, and the definitions decide the true-up. Sellers who propose the peg from their own trailing analysis, early, anchor the negotiation; sellers who wait inherit the buyer's number.

Sources & authorities

Primary sources for this page

  • Revenue recognition. ASC 606: the recognition policy conformed in the cleanup window, where buyer QoE teams start.
  • Non-GAAP measures. SEC Regulation G: the adjusted-EBITDA framework the vendor QoE is built to.
  • Earnouts and rollover. ASC 805: the consideration-versus-compensation classification a founder holding paper should understand before signing terms.
  • Leases. ASC 842: the lease liabilities that sit in the net-debt schedule the databook must present.

This page summarizes SEC rules and staff guidance for general information, and is not accounting or legal advice. Rules change; confirm the current text before you rely on it.

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Call: (347) 472-1115
Email: info@corviniti.com

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Ro Sokhi, CPA
Ro Sokhi, CPA
Founder & CEO · Big Four experience · 20+ years

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