A prospect asked for twenty percent off and I have not replied yet: what does saying yes actually cost?

Worth knowing how often no works, because the fear of losing the deal is usually larger than the risk.

In my experience most people who ask for a discount buy anyway when the answer is a polite no with a reason. They asked because asking is free.

What a good no sounds like:

Brief, warm, and not apologetic. We keep pricing the same for everybody, which is what lets me keep it where it is.

Offer the alternative in the same message, from the list above. A no plus an option is a negotiation; a bare no is a wall.

Do not explain your costs. It invites a discussion about whether your margins justify the price, which is not a conversation you want.

What to watch for: who is asking and why. A procurement department asking as policy is very different from a founder saying this is genuinely more than we can spend. The first wants a concession to report; a small trade satisfies it. The second is telling you something real about fit, and the honest answer might be a smaller package rather than the same thing cheaper.

And if they walk over twenty percent, you have learned something about how much they valued it - which is worth knowing before you build a relationship around them.

The rule that resolves nearly all of these: never lower the price without changing something on the other side.

A discount given for nothing teaches the buyer that your price is negotiable, which means it will be negotiated again at renewal and every renewal after. A discount traded for something is a different deal, and everybody understands it as such.

Things to trade for:

A longer commitment. Two years instead of one, at the discount. Very common, easy to justify, and it is genuinely worth something to you.

Payment up front rather than monthly or on terms. Cash now has real value.

A case study or a reference, in writing, with a date. For a first big customer this is worth a great deal.

Fewer seats or a lower tier. If they want to pay less, they can have less. This is the cleanest answer and the one people forget: the price is not too high, the package is.

A pilot period at a reduced rate that converts to full price on a stated date.

Any of those lets you say yes without saying my prices are whatever you push for. And the request itself is not an insult - procurement teams ask as a matter of routine, and a good number of them expect a no.

Biggest customer so far is exactly when this matters most, because whatever you agree becomes the template.

The costs beyond the money, since that was your actual question.

Renewal. Whatever you agree becomes the baseline. Going from a discounted price back to full at renewal is a price rise from their side, and it is a difficult conversation you have created for yourself twelve months out. If you discount, state the term explicitly: this rate applies to the first year: in writing, in the agreement.

Precedent inside their company. The person who negotiated it will mention it, and the next department that buys will start from that number.

Precedent with your other customers. Less of a risk than people fear, and not zero - public discounting becomes known, and your full-price customers are the ones who find out.

Your own anchoring. The uncomfortable one. Once you have discounted for a big logo you will do it again, and after three of those your list price is decorative.

What it does not cost: the relationship. A polite no does not offend a professional buyer.

So my suggestion for your specific case: offer the twenty percent for a two-year commitment paid annually up front, or the same price with a named case study. Either is a yes that costs you nothing you cannot afford, and both leave your price intact.