Sellers want full credit for growth that hasn't happened yet. Buyers don't want to pay for a trend that dies the week after closing. An earn-out is the bridge — and if you write it badly, it's the thing that turns a good deal into a two-year legal argument.
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Most first-time buyers think an acquisition is one number and one wire transfer. You agree on $340,000, you send $340,000, you get the logins. Clean. Simple. Done.
Real deals rarely work that way, especially once you get above the $200K mark. Seller financing shows up. Holdbacks show up. And the structure that causes the most confusion — and the most post-close litigation per dollar of deal value — is the earn-out.
I've watched buyers agree to earn-outs they didn't understand, then spend eighteen months arguing over whether "monthly recurring revenue" includes annual plans amortized or booked in full. That argument costs more than the disputed payment. So let's do this properly: what an earn-out is, when it's the right tool, when it's a trap, and exactly how to write one that doesn't come back to bite you.
An earn-out is a purchase price structure where a portion of what the buyer pays is contingent on the business hitting specific performance targets after closing. Instead of paying the full agreed price on the closing date, the buyer pays a base amount up front and then makes additional payments if and when the business meets defined revenue, profit, or operational milestones.
Here's a concrete version. A content site is listed at $420,000 based on $10,500/month in average SDE at a 40x multiple. The buyer looks at the traffic chart and sees that 60% of the growth happened in the last five months following a single Google core update. That growth might be permanent. It might reverse on the next update. So the buyer offers $330,000 at close, plus $90,000 paid over the following twelve months if trailing-twelve-month SDE stays above $115,000. The seller gets the full $420,000 if they're right about the business. The buyer avoids overpaying if they're wrong.
That's the entire logic. Earn-outs exist because buyers and sellers are pricing two different businesses. The seller is pricing the business they believe it will be. The buyer is pricing the business as it verifiably is today, discounted for transfer risk. An earn-out lets both parties be right on their own terms — the seller captures upside if the trend holds, the buyer gets price protection if it doesn't. Nobody has to convince the other person they're wrong about the future.
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In the online business world — content sites, ecommerce brands, SaaS, newsletters, Amazon FBA — earn-outs follow a fairly narrow set of conventions. Understanding the norms matters because proposing something wildly outside them signals you're inexperienced.
Size: Typically 10% to 30% of total purchase price is tied to earn-out conditions. Below 10%, it's not worth the administrative complexity and the relationship friction. Above 30%, you're asking the seller to finance your risk to a degree most will refuse, and honestly, if 40% of the price depends on unproven performance, you probably shouldn't be buying at that valuation at all. The sweet spot in deals I've seen close cleanly is 15% to 25%.
Period:
Period: Usually 12 to 24 months. Twelve months is common for ecommerce and content, where seasonality means you need a full annual cycle to know what you actually bought. Twenty-four months shows up in SaaS deals where retention and churn take longer to reveal themselves. Anything longer than 24 months is rare and problematic — the buyer's own operational decisions increasingly drive results, which makes attribution impossible.
Metrics: The trigger should be objective and verifiable. Good examples: "monthly gross revenue exceeding $10,000 for three consecutive months," "trailing-twelve-month Stripe net revenue of at least $180,000 as of the anniversary date," "retention of the Acme Corp contract through December 31." Bad examples: anything based on SDE, adjusted EBITDA, or "net profit" without a page of definitions attached. I'll come back to why in a moment.
Payment structure: Either milestone-based (hit the target, get the lump sum) or tiered/pro-rata (partial payment for partial performance). Tiered structures reduce disputes because they eliminate the cliff. If the target is $120,000 in SDE and the business does $119,400, a cliff structure means the seller gets nothing and immediately hires a lawyer. A pro-rata structure means they get 99.5% and everyone moves on with their lives.
Earn-outs are the right tool in a specific set of situations. Outside those situations, they add complexity without adding value.
Situation one: recent rapid growth. The business has grown sharply in the last three to six months and the seller wants full credit for a trend line that may or may not continue. This is the classic case. A newsletter goes from 40,000 to 95,000 subscribers in four months because one post went viral. Ad revenue tripled. The seller wants to be valued on the new run rate. The buyer doesn't know whether that audience will stick or whether open rates will collapse. An earn-out resolves it: base price on the trailing twelve months, earn-out on sustaining the new level.
Situation two: customer or channel concentration. A B2B service business where one client is 35% of revenue. An Amazon brand where one SKU is 60% of profit. A site where 80% of traffic comes from a single Pinterest account. The uncertainty is identifiable and specific, which makes it perfect for a contingent payment. Structure the earn-out around retention of that specific relationship or channel through a defined date. If it holds, the seller earns the money. If it doesn't, the buyer didn't overpay for it.
Situation three: pending changes with unknown outcomes. A recent algorithm update, a platform policy change, a supplier transition, a rebrand mid-flight. Anything where you can point at a specific event and say "we won't know the impact of this for six months." Earn-outs handle known unknowns well. They handle general vague nervousness badly.
Earn-outs generate three predictable categories of conflict, and every one of them traces back to language that seemed clear when it was written and turned out not to be.
Dispute one: was the target actually met? This sounds absurd until you live it. Does "revenue" mean gross or net of refunds? Are Stripe processing fees deducted? What about a chargeback that hits in month 13 on a month-11 sale? If the target is $10,000/month and the business does $10,000 in bookings but $9,600 in collected cash, who's right? Every one of these has been the center of a real argument. The purchase agreement needs to answer all of them before anyone signs.
Dispute two: who caused the underperformance? The business misses the target. The seller says it's because the buyer cut the ad budget, changed the pricing page, fired the VA who handled customer support, and stopped publishing content. The buyer says it's because the traffic was already declining and the seller knew it. Both may be partially true. This is why earn-outs longer than 24 months rarely work — the further you get from closing, the more the buyer's own choices drive the outcome, and the less defensible any attribution becomes.
Dispute three: metric gaming. If the seller has any operational involvement during the earn-out period, they have a direct financial incentive to hit the number by any means available. That can mean discounting aggressively to pump revenue while destroying margin. It can mean pulling forward annual contracts that would have renewed later anyway. It can mean spending your ad budget at a 0.9 ROAS because the earn-out is measured on revenue, not profit. I've seen a seller push a "lifetime deal" promotion in month eleven that hit the revenue trigger and permanently gutted the subscription base.
The single most important principle: tie the earn-out to a metric the seller cannot manipulate and that requires no interpretation to calculate. That almost always means raw platform data, not accounting outputs.
Stripe net revenue. Shopify gross sales less refunds. Amazon Seller Central settlement deposits. Mediavine or Raptive payout statements. These come from third parties, they're timestamped, and neither party can retroactively adjust them. Compare that to SDE, which requires agreeing on add-backs, owner compensation, one-time expenses, and depreciation treatment — every one of which is a judgment call and therefore a potential argument. If your earn-out is triggered by "SDE exceeding $120,000," you have not defined a trigger. You've defined a negotiation that will happen in eighteen months when both parties have already spent the money in their heads.
Here's the checklist I use when reviewing an earn-out clause before signing anything:
Sellers hear "earn-out" and often hear "the buyer wants to pay me less." Sometimes that's exactly what's happening, and experienced sellers can smell it. The way to keep the conversation productive is to tie the earn-out to a specific uncertainty you can both see in the data.
Frame it that way explicitly. "Your last five months are running at $14K SDE, but the trailing twelve is $9,800. I'm happy to pay the multiple on the higher number — I just need it to hold for six months first. Base price on the trailing twelve at 38x, plus the difference paid out if the last six months of the year average above $13K." That's a conversation between two rational parties about a real question. It's very different from "I'd like 25% of the price contingent, just in case."
Expect pushback on the metric. Sellers will often prefer profit-based triggers because they believe post-close cost cutting will help them hit the number. Buyers should insist on revenue-based triggers because they're clean and unmanipulable. A reasonable compromise: revenue trigger with a minimum gross margin floor, so the seller can't hit the revenue number by discounting into oblivion. Something like "gross revenue above $180,000 with blended gross margin no lower than 58%."
Also negotiate the interaction with seller financing, if there is any. Many deals in the $250K to $2M range on Empire Flippers combine a cash base, a seller note, and sometimes an earn-out on top. Make sure the documents are consistent about payment priority and what happens if the earn-out fails but the note is still outstanding. I've seen agreements where those two sections contradicted each other, which is a great way to spend $8,000 on lawyers to resolve a $20,000 question.
Earn-out frequency varies a lot by marketplace and deal size. On Flippa, where a large share of listings sit below $150K, most deals close as straight cash purchases — the complexity of an earn-out isn't worth it on a $60,000 site, and neither party wants a two-year relationship over a $12,000 contingent payment. Above roughly $250K, structure gets more common, and above $1M, some form of deferred or contingent consideration is close to standard.
The listings where you should be thinking about earn-outs before you even make contact share a few characteristics: growth concentrated in the most recent quarter, revenue dependent on one customer or one channel, a recent platform or algorithm event, a business model change within the last year, or a seller who is genuinely essential to operations and needs to transition out over time. When you see two or more of those together, plan your offer structure before you get on the seller call, not after.
This is a lot of the reason I built Deal Alert AI the way I did. Scanning listings manually across multiple marketplaces means you see maybe forty deals a week and you're pattern-matching from memory. The platform tracks listings across brokers and marketplaces continuously, surfaces the ones matching your criteria, and — importantly for this topic — gives you visibility into what deal structures are actually common for specific business types and revenue bands. Knowing that content sites in the $300K–$600K range with recent traffic spikes typically close with 15–20% contingent consideration is the kind of context that makes your first offer credible instead of insulting.
The broader point: structure is negotiable, and most first-time buyers don't realize how much room there is. You are not choosing between "pay the asking price in cash" and "walk away." You can propose a base plus earn-out, a base plus seller note, a holdback for specific risks, or all three. Sellers who've been on the market for ninety days are far more flexible than their listing suggests. If you want help finding those listings and understanding what a reasonable structure looks like for that asset class, that's exactly what Deal Alert AI is built to do.
An earn-out is a good solution to a specific problem: the buyer and seller disagree about the future, and the disagreement is about something concrete and measurable. It's a bad solution to vague discomfort, incomplete diligence, or a valuation gap driven by a seller who's simply asking too much.
If you use one, keep it in the 10–30% range, keep the period at 24 months or less, tie it to raw platform data rather than accounting figures, use tiered payouts instead of cliffs, and write the dispute resolution mechanism before you need it. Have a lawyer who has actually closed online business deals review the language — not a general business attorney, someone who has seen how these disputes play out in practice. The $2,000 to $4,000 that costs is cheap relative to the risk.
And remember that the earn-out is only as good as the relationship behind it. You're going to be exchanging emails with this person for the next one to two years about numbers that affect their bank account. Deals structured adversarially tend to end adversarially. Deals where both parties genuinely understood and agreed to the logic tend to pay out quietly and on time. Build the structure honestly, document it obsessively, and it'll do exactly what it's supposed to do — let you buy a business at a fair price without betting your capital on a trend line you can't verify yet. For more buyer guides and live deal flow across the major marketplaces, head over to Deal Alert AI.
By Sophal Lanh, Founder of Deal Alert AI
We scan Empire Flippers, Acquire, Flippa, and Quiet Light daily. The best sub-$500K businesses are gone within 48 hours.