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M&A Due Diligence

Sales tax liability doesn’t stay with the seller. It follows the assets.

We quantify sales and use tax exposure on either side of a transaction — for buyers who need to know what they’re inheriting, and for sellers who’d rather find it before the other side does. If there’s a gap, we tell you what it costs and what it takes to close it.

Buy-side diligence Sell-side readiness Escrow & indemnity support Post-close remediation
Exposure summary — the target
$1.42M identified
Unregistered nexus — 6 states
Earliest trigger 2019, never filed
$610K
SaaS taxability misapplied
Treated exempt in 4 taxing states
$385K
Missing exemption certificates
218 exempt sales undocumented
$240K
Unaccrued use tax on purchases
Equipment and software, 3 years
$132K
Penalty and interest
Accrued on the above
$53K
Recoverable via VDA
Lookback capped, penalties waived
−$470K
Illustrative. The last line is the one that matters in a negotiation: exposure with a remediation path priced beside it.
Net exposure after remediation
$950K
Why this line item bites

Most diligence checklists treat sales tax as a footnote. It’s the one liability that can survive the closing.

Income tax exposure is generally well covered by counsel and the accountants. Sales tax sits in a gap: it’s transactional, multi-jurisdictional, and rarely anyone’s specialty on either side of the table.

Successor liability is real

In many states, unpaid sales tax attaches to the business or the assets — not only to the entity that owed it. Buying assets does not automatically leave the liability behind, and a stock deal certainly doesn’t.

Unregistered periods never close

For a business that filed, a state generally reaches back three to four years. For one that never registered, many states treat the period as open to the date nexus began. A target with a five-year gap has a five-year liability.

It surfaces at the worst moment

Found in week two, it’s a purchase-price adjustment. Found in the final week, it’s a re-trade, an escrow fight, or a deal that slips a quarter.

A number isn’t enough

“There may be exposure here” stalls a deal. “The exposure is $1.4M, roughly $470K of it resolvable through voluntary disclosure, and here’s the timeline” lets both sides price it and move. We produce the second kind of answer.

SaaS and digital are the usual culprits

Software companies frequently treat their product as non-taxable everywhere. A meaningful number of states disagree, and a fast-growing target has usually crossed thresholds in most of them.

The clock keeps running

Exposure isn’t static. Every month between diligence and close adds to it, and a state making contact in that window forecloses the cheapest remediation path.

Either side of the table

We represent buyers and sellers. Not in the same deal.

The analysis is the same discipline. What changes is who the number is for and what they need to do with it.

Buy side

Know what you’re inheriting.

We quantify the target’s exposure state by state and hand you a figure you can take into the negotiation — with the remediation cost and timeline priced beside it.

Nexus and taxability review of the target’s actual sales history

Exposure quantified with penalty and interest, by state and by year

Support for the escrow or indemnity number, and for the reps you want

A remediation plan you can run on day one, and we can run for you

Turnaround that fits a diligence window, not a calendar quarter

Sell side

Find it before they do.

Exposure a buyer discovers is a discount. Exposure you’ve already quantified and started remediating is a line item you control. The difference is often a multiple of the tax itself.

A clean read on your own exposure before the data room opens

Voluntary disclosure filed and underway, capping the lookback

Documentation that answers the buyer’s question before it’s asked

Fewer surprises in diligence, which means fewer re-trades

A defensible position on the reps and warranties you’re being asked to sign

How a review runs

Deal speed, not audit speed.

A diligence review has a deadline that isn’t ours to move. We scope to the window you have, tell you up front what we can establish in it, and flag early if what we’re finding warrants more.

We’ve completed over 42,000 projects across 13,000+ state and local jurisdictions since 1992, so the research is rarely starting from zero.

Scope a diligence review
Scoped per transaction
Four stages
01
Scope to the window
What data exists, what the deal timeline allows, and where the risk is most likely concentrated given what the target sells and where.
02
Establish the footprint
Where nexus was triggered and when, against where the target actually registered and filed. The gap between those two is the exposure period.
03
Quantify it
Uncollected tax, unaccrued use tax, undocumented exemptions, penalty and interest — by state, by year, with the reasoning behind every figure. Auditable, because someone on the other side will test it.
04
Price the fix
Which states are voluntary disclosure candidates, what that reduces the number to, how long it takes, and what it costs. This is the section that gets read in the negotiation.
What the number is used for

A diligence finding is only useful if it survives contact with the other side’s counsel.

Our reports are built to be tested. Every figure traces to a statute, a transaction set, and a stated assumption — so when the other side pushes back, the conversation is about the assumptions rather than about whether the work is credible.

Purchase price adjustment

Where the exposure is quantified and certain, it’s usually cleanest to take it off the price.

Escrow sized to the exposure

Where remediation is underway but not complete, an escrow sized to the remaining risk — with a release trigger tied to the VDAs closing.

Specific indemnity

For identified state-level exposure, carved out from the general reps with its own survival period.

Post-close remediation

We file the voluntary disclosures and register the entity after close, so the liability actually gets resolved rather than inherited and forgotten.

Where exposure hides

The five places we find it most often in a target, roughly in order of how much it tends to be worth.

Nexus triggered, never registered
The open-ended lookback makes this the largest single line, almost every time.
Product treated as non-taxable
Especially SaaS, digital goods, and services sold into states that tax them.
Undocumented exempt sales
Exempt on the invoice, unsupported in the file. Assessed as taxable.
Use tax never self-assessed
On equipment, software, and services bought from vendors who charged no tax.
Local jurisdictions skipped
Registered with the state, never with the home-rule cities that administer their own tax.
Who you’d have on the deal

Available at deal speed.

Diligence timelines don’t move because sales tax is complicated. We scope to the window you have and tell you at the outset what we can establish with confidence inside it.

You get accountants who work alongside your existing advisors on the sales and use tax workstream, comfortable staying in the background.

1992
Founded
13,000+
Jurisdictions worked in
42,000+
Projects completed
Sales Tax People accountants working to a deal deadline with a client.

Questions we hear a lot

How fast can you turn this around?

We scope to the diligence window. A focused review on a mid-market target is typically a matter of weeks, and we’ll tell you at the outset what we can establish with confidence in the time available.

Our accounting firm is already doing tax diligence.

Usually on income tax, which is a different discipline. We’re frequently engaged alongside a deal team’s existing advisors specifically for the sales and use tax workstream, and we’re comfortable working inside their process.

Does an asset deal protect the buyer?

Less than people assume. Many states have successor liability provisions that attach unpaid sales tax to the business or its assets regardless of deal structure. It’s worth establishing state by state rather than assuming.

Can you handle the remediation after close?

Yes, and it’s the common outcome. We file the voluntary disclosures, register the entity where needed, and take over monthly compliance so the newly acquired footprint doesn’t start accruing fresh exposure.

Tell us the timeline. We’ll work to it.

Whether you’re a week into diligence or six months from going to market, the first conversation establishes whether sales tax is a real issue in this deal or a box to tick.