The first time a prospect's procurement team asked about source code escrow, I did what most founders do before responding: I guessed. I told our champion I'd get back to her by end of week, then spent two days assuming the answer would run us five figures and require hiring someone to manage it. Neither assumption survived an actual spreadsheet.
I built that spreadsheet before our next call with them, and I've rebuilt it twice since as the ask has come up on other deals. Here is what actually goes into the number, line by line, because the estimate most founders carry in their head is wrong in a specific and fixable way: they price the fear, not the invoice.
The number founders guess is almost always too high
Ask five founders what source code escrow costs and you'll get five wild guesses, usually somewhere between "a few thousand" and "enough to matter." The actual all-in cost for a first agreement, at the deal sizes where this comes up for early-stage SaaS companies, lands between $3,500 and $9,000 in year one, and roughly half that in renewal years once the setup work is done. That range holds whether the contract you're protecting is $80K or $400K, because the cost is driven by the escrow arrangement itself, not the deal size. That's the detail that makes the math worth doing in advance: the cost doesn't scale with the thing it's protecting.
The five line items that make up the real number
The provider's setup fee is the first and most visible cost, typically $500 to $1,500 with a SaaS-specific escrow provider that can hold an activatable environment instead of a static file drop. The annual custody fee runs $1,500 to $4,000 depending on deposit size and how often you're contractually required to refresh it. Legal review of the escrow agreement itself, assuming your counsel hasn't seen one before, ran us about $1,800 in outside counsel time; that drops close to zero on your second and third agreement once you have a template position to hand them.
The line item almost nobody prices in is engineering time to actually assemble a working deposit: application code is the easy part, the real work is packaging deployment configuration, infrastructure-as-code, database schema, and enough documentation that a third party could plausibly stand the product up without your team in the room. Budget two to four engineering days for the first deposit, and expect that to shrink to hours once it's a defined, repeatable checklist rather than a one-off scramble. The fifth cost, verification, only shows up if a customer exercises their audit rights: most agreements cap this at one audit per year through the escrow provider, which typically runs $500 to $1,200 per instance and is rarely invoked in practice.
The cost that doesn't show up on any invoice
None of the numbers above are the real risk. The real cost is what happens when you don't have a position on escrow before a deal is already 90% closed and a security team raises it with a deadline attached. That's not a line item you can quote, but it's the one I'd weight heaviest: a scramble under deadline pressure doesn't just cost you engineering hours pulled from roadmap work, it costs you negotiating leverage, because you're now agreeing to terms fast instead of terms you've actually thought through. The founders I've talked to who got burned here didn't overpay for escrow. They agreed to open-ended trigger events or uncapped verification rights because they were negotiating against a closing deadline instead of a template.
What actually moves the number up or down
Three variables do most of the work. How many separate deposits you maintain matters more than deal count, since most providers let you cover multiple customers under a single master arrangement rather than paying setup fees repeatedly; ask for this explicitly, because it's rarely offered up front. How often you're contractually required to redeposit after a release matters too: quarterly refresh clauses cost meaningfully more in engineering time than annual ones, and it's a negotiable term, not a fixed requirement. And whether you're building the deposit process from scratch or reusing a documented checklist is the single biggest swing factor between the first agreement and every one after it, which is exactly why the founders who get surprised by cost are almost always on their first request.
What I'd budget starting now
If you're closing deals above roughly $75K ACV with any procurement or security review step, budget $6,000 to $8,000 for the first escrow agreement, spread across provider fees, legal review, and engineering time, and expect that to fall by more than half on the second one. Don't wait for the request to build the deposit checklist; the cost difference between a rehearsed process and a first-time scramble is bigger than the cost of escrow itself. When the ask lands, you want to be quoting a number from memory, not building the spreadsheet for the first time with a closing deadline already on the calendar.