The proposal lands with two numbers on it. Fifteen thousand a month, billed monthly. Or eighty-one thousand paid up front for six months, which works out at thirteen and a half a month. Ten percent off, and a line underneath saying the discounted rate is only available on the six-month prepay.
The discount is real. The question is whether you should take it, and the answer depends almost entirely on something the proposal does not mention: how sure are you, today, that this is the right person?
What the discount is actually buying
Understand what is happening on the other side of the table. A fractional CTO holds a small number of clients, usually three to five. Their business risk is not that you stop paying, it is that you churn in month two and leave a hole in the calendar that takes six weeks to refill. A six-month prepay eliminates that risk entirely and hands them working capital at the same time.
Ten percent is a rational price for that. If anything it is on the low side compared to what the certainty is worth to them. So the discount is not a trick and it is not desperation. It is a fair trade of your flexibility for their security.
The mistake founders make is evaluating it as a cash decision when it is a risk decision. Ten percent of a six-month engagement is $9,000. Getting five months into the wrong engagement costs you $67,500 plus the two months of company drift that come with it. The discount is not the material number here.
The one thing that decides it
Ask yourself: have I seen this person work on my actual problem, or have I only seen them talk about it?
If the answer is that you have seen them work, prepay is often a good deal. You know the quality, you know the communication cadence, you know whether they tell you bad news early. The residual risk is low, the discount is free money, and the finance side is simpler because you are not renegotiating every quarter.
If the answer is that you have only had good conversations, do not prepay. Not because the person is likely bad, but because you have no evidence either way and you are being asked to buy six months of evidence-free commitment at a ten percent discount. That is the wrong trade at any discount.
The way out of that is not to negotiate the discount. It is to create the evidence first. A two to three week paid piece of work with a defined deliverable, at full rate, tells you more than any number of calls. I have written about how to structure that so it is useful to both sides in running a paid trial before you commit to a fractional CTO. Do that, then take the prepay if it went well. You will have spent full rate for three weeks and saved yourself from the only expensive outcome.
The terms that make a prepay safe
If you decide to prepay, the discount is not the thing to negotiate. These four clauses are.
Unused months are refundable, pro rata, on notice. This is the whole ballgame. A prepay with a refund clause is a discount. A prepay without one is a non-refundable six-month commitment dressed as a discount. Reasonable language: either party may terminate on thirty days written notice, and the unused portion of the prepayment is refunded within fourteen days, calculated at the discounted rate.
Note that last part. If you paid $13,500 a month and leave after two months, you should be refunded four months at $13,500, not four months at $15,000. The discount applies to what you used. Some operators will argue that leaving early forfeits the discount on the months you consumed, meaning they rebill the first two at full rate. That is defensible and you should know which version you signed.
The rate is locked for the full period. Obvious, but state it. You are giving up flexibility, so you should get price certainty in return.
Days per month are defined, and unused days roll forward at least one month. Prepay makes the utilisation question sharper. If you buy six months of eight days a month and one of those months is a quiet one because you were heads-down on sales, you do not want to have burned eight days of nothing. A one-month rollover is normal. A full six-month pooled arrangement is generous and some operators will do it. Nobody sensible offers unlimited rollover, because the point of a retainer is a steady rhythm.
What happens if they take a full-time job. It happens. Fractional operators get offers. You want a clause that says if they cannot continue, the unused prepayment is refunded in full within thirty days, and they will introduce you to two replacements. Not a penalty, just a clean exit.
If any of those four get pushback, that tells you more than the pushback on price would.
When prepay is the wrong instrument entirely
Three situations where I would not take it even at a steeper discount.
Your runway is under nine months. Prepay converts flexible monthly spend into a sunk cost at exactly the moment flexibility is the most valuable thing you own. If you are nine months out and a fundraise is uncertain, keep the money liquid and pay monthly even though it costs more. The optionality is worth more than ten percent. This is the same logic as every other cash decision at that stage, and it is why I take a different position on structure when the account is tight, which I set out in paying a fractional CTO when cash is tight.
The scope is genuinely undefined. If you cannot say what the next quarter looks like, you cannot price six months of it. Prepay assumes stability that you do not have. Do a shorter engagement with a defined outcome and re-scope after.
You are prepaying to avoid a conversation. Occasionally a founder prepays because negotiating monthly feels awkward, or because they want to lock someone in who they sense is drifting. Neither is a reason. Money does not fix an attention problem, and locking in a disengaged operator just means you have paid in advance for the disengagement.
The counteroffer worth making
If the six-month prepay makes you uncomfortable but the discount is attractive, there is a middle version that most operators will accept: three months prepaid at a smaller discount, with an option to extend at the same rate. You typically land at five or six percent instead of ten.
You give up half the discount and you cut the commitment in half. If you are unsure, that is the right side of the trade. And you have created a natural review point at month three, which is when you will actually know whether this is working.
Ask for it directly. In my experience most operators say yes immediately, because a three-month prepay still solves the calendar problem they were pricing for.
If you have a proposal in front of you and want a second read on the commercial terms before you sign it, that is a useful hour. Our own structure is on the Fraction pricing page, and you can book a call and bring the document.
Common questions
Is ten percent a normal prepay discount for a fractional CTO?
Five to fifteen percent is the range I see, with ten being the most common for a six-month term and five for three months. Anything above twenty percent is worth a second look, not because it is dishonest but because it suggests the operator needs the cash badly enough to price below their own worth, and cash pressure has a way of showing up in the work.
Should the prepayment sit in escrow?
For sums under about $100,000 it is usually more friction than it is worth, and the refund clause does the same job. Above that, or if you are prepaying a full year, escrow or staged release at the start of each quarter is reasonable to ask for and most operators will not object.
Can I ask for a discount without prepaying?
You can, and the honest answer is usually no, because the discount exists to pay for the certainty rather than the cash. What you can often get instead is a longer notice period in exchange for a lower rate, which gives them calendar security without you writing a large cheque. Sixty or ninety days notice for five percent off is a trade worth proposing.
What if I prepay and then want to change the scope?
Scope changes are normal and should not require renegotiating the prepay. What matters is that the days per month and the rate are what you fixed; what you point those days at is yours to redirect. If the new scope needs materially more days, that is an overage conversation on top of the prepaid base, at the discounted rate.
Does prepaying get me priority over their other clients?
Not automatically, and be careful here. Availability is a separate commercial term, not a side effect of payment timing. If response time matters to you, negotiate it explicitly as part of the agreement rather than assuming the prepayment bought you a place at the front of the queue.