The Ackerman Method, Made Practical
Sequenced bidding, calibrated concessions, and the psychology of closing
The Ackerman Model: Chris Voss’s 65-85-95-100 Method
The Ackerman model, taught by Chris Voss in Never Split the Difference, is a four-bid negotiation sequence: after setting your target, you offer 65% of it, then 85%, then 95%, then your true 100% target — each increase smaller than the last. The shrinking increments signal you are nearing your real limit even as you appear to keep conceding, so your counterpart feels they have won a hard bargain while you land at the number you planned all along.
Most negotiators concede in equal steps — which signals that more is available. The Ackerman method, drawn from FBI hostage negotiation and commercial deal-making, uses decreasing concession size and deliberate non-round numbers to signal genuine limits. The counterpart feels they have extracted maximum concessions — even when you have stayed close to your target. These practices break down how and why the method works.
Practices
- Set your target before you open — never anchor to their first offer
Know your target and your walkaway before any numbers are exchanged, so their anchor doesn’t colonize your frame.
- Use the Ackerman bid sequence: 65%–85%–95%–100% of target
Make four calculated offers that converge on your target with shrinking steps — each concession signals you are approaching your limit.
- Use precise, non-round numbers in final offers
A specific non-round number signals calculation and research, not an arbitrary position.
- Accompany your final offer with a small non-monetary concession
Adding a low-cost non-monetary item to your final offer signals genuine limit while giving the counterpart a win.
- Maintain empathy and calibrated questions throughout the Ackerman process
The bidding system only works inside a relationship — empathy and understanding keep the counterpart engaged rather than walking away.
- Chris Voss 65-85-95-100 Ackerman model: rehearse the official sequence
Drill the official four-bid Ackerman sequence — 65%, 85%, 95%, then 100% of your target — out loud in advance, so you execute it under pressure.
How these practices connect
Every practice here manages what information your concessions communicate. A number, a concession size, a round versus precise figure, a tone of voice — each one either signals that you have room left to give or signals that you don't, whether you intend it to or not. The Ackerman method works by making sure every signal you send points the same direction: toward a real, calculated limit, delivered inside a relationship the other side still trusts.
Do you have to pick a target number before you start negotiating?
Yes, and skipping this step undermines the rest of the sequence. Setting your target and walkaway before any numbers are exchanged protects you from anchoring: their first offer becomes the reference point your own judgment adjusts from if you haven't already fixed your own number. The 65-85-95-100 bid sequence is calculated as percentages of that target, so without a pre-set target there's nothing for the Ackerman percentages to be percentages of.
Why does the Ackerman method use four offers instead of just negotiating normally?
The four-step structure (65%, 85%, 95%, 100% of your target) exists to communicate a message through the size of each concession rather than through words. Decreasing steps — a 20-point jump, then 10, then 5 — signal that each concession is costing you more, which reads to the other side as approaching your real limit. Equal-size concessions made repeatedly send the opposite signal: that more is available at every step, which invites the other side to keep pushing past where you actually intended to land.
Why use a weirdly specific number like $47,800 instead of $48,000?
A round number reads as a placeholder — a starting point that both sides expect to move. A precise, non-round number implies a specific calculation behind it, which makes it feel like the product of real analysis rather than an arbitrary position, and that perceived legitimacy reduces how much further movement the other side expects. This only works as a final-offer move: using precise numbers throughout and only going round at the end (or vice versa) creates a contrast that can feel theatrical rather than calculated.
What's the point of throwing in something extra on your last offer?
A small non-monetary addition on your final offer — a service, a timeline accommodation, a minor term — does two things at once: it signals sincerity, because giving something extra implies you genuinely can't move further on the main number, and it gives the other side a face-saving win they can point to even though the number itself was your target all along. It only works if the item is something the other side actually values; an item they don't want reads as a bid to close the deal rather than a mark of a real limit, which can make them push harder on the number instead.
Can you just run the numbers without building any rapport?
No — a mechanical bid sequence with no relational warmth reads as a script, and scripts trigger suspicion and resistance rather than agreement. Tactical empathy and calibrated questions like "How am I supposed to do that?" are what make each Ackerman bid land as part of a genuine conversation instead of a set of numbers being pushed at the other person. Run the bids without it and the other side feels processed rather than negotiated with, which tends to make them dig in or walk away rather than converge toward your target.
Why practice the Ackerman sequence out loud before a real negotiation?
High-stakes negotiations create cognitive and emotional load that degrades in-the-moment decisions, and rehearsal moves the numbers, counteroffer responses, and calibrated questions into procedural memory so you're not reconstructing them under pressure. That freed-up working memory is what lets you actually read the other person and adapt, rather than concentrating on remembering your own script — which is also why the empathy and precise-number elements have to be rehearsed alongside the percentages, not treated as separate add-ons. Rehearsal builds fluency for the scenario you planned for; it won't prepare you for something genuinely novel that departs from that plan.
How do you choose between these?
Set-your-target-first and rehearsal are not optional add-ons to choose between — they're preparation that has to happen before any negotiation using this method, high-stakes or not. Within the live negotiation, the choice is about which signal the moment calls for: use the full four-step bid sequence when you have real room to move and want the shrinking-concession pattern to do its work over time; reach for a precise non-round number and a non-monetary add-on specifically at the final offer, since both are closing signals that lose their force if used earlier. Empathy and calibrated questions aren't a step in the sequence at all — they need to run underneath every bid, from the first offer to the last, or the numbers alone will read as a script regardless of how well-calculated they are.
What these approaches do not settle
The specific 65-85-95-100 percentages are practitioner heuristics from Chris Voss's own account, not experimentally validated thresholds — the evidence is anecdotal even though the underlying principle behind them, that decreasing concession sizes signal a genuine limit, does have behavioral research support. The non-monetary concession and the empathy requirement are both grounded in mechanism rather than controlled trials, and both depend entirely on being genuine: a non-monetary item the other side doesn't want, or empathy that reads as performed, tends to backfire into signaling manipulation rather than a real limit. Anchoring research is the strongest-evidence piece here (RCT-level), but even pre-committing to a target only reduces anchoring effects, it doesn't eliminate them.
Practice this with IX Coach
Related concepts
- Never Split the Difference, In Practice
The FBI hostage-negotiation toolkit, with the mechanism behind each move
- BATNA: Your Best Alternative to a Negotiated Agreement
Walk-away power, realistic alternatives, and why your BATNA is your negotiating power
- Principled Negotiation, Made Practical
The four-element framework for reaching agreements that hold