How Procurement Can Deliver Cost Savings That Actually Last

A negotiated saving is a promise. A sustainable saving is one that is still there a year later, visible in what the company actually paid.

The gap between the two is bigger than most people expect.

Put those two together and roughly half the pipeline never arrives. That is the problem this article is about.

#Part 1: Where durable savings come from

Not all savings are equally sticky. These six levers are ordered by how well they tend to survive, most durable first.

1. Buying less of it

The most durable saving is the purchase that does not happen. Licences nobody uses, services nobody asked for, stock ordered out of habit, premium delivery on things nobody needs quickly.

This is unpopular because it means challenging colleagues rather than suppliers. It is also the only lever a supplier cannot claw back at renewal.

2. Changing what you specify

The second most durable saving comes from the specification, because it changes the cost rather than the margin.

The technique that supports this is a should-cost model. You build up what something ought to cost from its parts: labour, materials, overhead and a reasonable margin. You do not start from what suppliers quote. The UK Government's Sourcing Playbook requires one for complex outsourcing. It says this helps protect buyers from "low cost bid bias": prices that look attractive but cannot actually be delivered.

The US Government Accountability Office found the same discipline in leading companies. Of the four tactics it identified, two were standardising requirements and understanding cost drivers.

3. Consolidating suppliers and volume

Fewer suppliers for the same spend means more volume per relationship and better terms. The Hackett Group's leading procurement organisations use 3.6 times fewer suppliers per billion of spend than their peers, while influencing about 20% more spend.

Ardent Partners puts a number on bringing spend under management: each additional dollar produced 6% to 12% savings in the first contract period. Average spend under management is about 71%, so most companies have room here.

4. Competition

Running a proper sourcing process rather than renewing by default. GAO found officials at seven leading companies reporting savings of 4% to 15% over prior-year spending from strategically sourcing services. Treat that range carefully — self-reported, seven companies, 2013, and GAO called the sample not generalisable — but the direction is well supported.

5. Price negotiation

Useful, and the one most teams start with, but it has a limit. As the practitioner newsletter The Procurist puts it: "Cost reduction has a ceiling. You can only negotiate so deep before you hit supplier profitability."

Push past that ceiling and you do not get savings. You get a supplier cutting corners, or failing.

6. Payment terms and discounts

This improves cash rather than margin, and it belongs in a different line of your reporting. The Hackett Group's 2025 working capital survey put average days payable outstanding at 59 days across the top 1,000 US listed non-financial companies.

One caution. APQC warns that paying smaller suppliers more slowly may create cash-flow problems for them and permanently damage the relationship. RapidRatings found only 15% of enterprises fully use supplier financial health data when setting payment terms. Stretching terms without checking who you are stretching is how a savings initiative becomes a supply problem.

#Part 2: The five ways savings leak

Leak 1: You and finance never agreed what the baseline was

Procurement usually measures against the last price paid or the next best quote. Finance measures against the budget. Work reported by CFO.com describes this mismatch directly: procurement tracks categories while the business tracks budgets, so the two never reconcile.

The Procurist states the consequence plainly: "Otherwise, procurement says it protected millions while Finance simply sees that the budget was respected."

Leak 2: People keep buying elsewhere

A negotiated rate only becomes a saving when purchases actually go through that contract. The Hackett Group's leading teams lose 60% less of their negotiated savings to off-contract buying and non-compliance than their peers.

Leak 3: Prices creep back

Year one is the agreed price. Year two brings an inflation adjustment nobody modelled. Year three brings another. The saving is gone and no single decision caused it.

Leak 4: The volume assumption was wrong

Savings are usually calculated as a unit price reduction multiplied by expected volume. If volume falls, so does the saving — and if the contract had volume commitments, you may owe money instead.

Leak 5: One-off savings counted as recurring

A one-time rebate is not an annual saving. Counting it as one produces a hole in next year's target and a credibility problem that outlasts it.

#Part 3: The mechanisms that make savings stick

Agree the baseline in writing, before the work

Write down what the comparison price is, what volume is assumed, which cost centre it affects and over what period. Get finance to agree it before negotiating. A baseline agreed afterwards is a debate.

Write the price mechanism properly

This is the most under-used tool in the list, and government guidance is unusually clear on it.

The UK Sourcing Playbook advises indexing only the costs that sit outside the supplier's control, using published indices from reputable sources. Where a service has several cost drivers, it suggests a composite index. That is a weighted average of the individual indices, weighted by how much each one contributes to total cost.

The reasoning is worth quoting: a contractual index "will shield suppliers from costs outside their control and incentivise them to manage costs that they can control". It also removes the supplier's reason to pad the price with a risk premium against inflation that may never arrive.

Make the compliant route the fastest route

Leak 2 is usually a service problem rather than a discipline problem. Catalogues with the agreed supplier and price built in stop the leak without new rules. Hackett's advisers found leading teams put 81% more indirect spend through electronic catalogues than their peers.

Say who pays when duties change

Tariffs have made this urgent. McKinsey's December 2025 survey of 100 companies found 82% said new tariffs affected their supply chains. Across all industries, the weighted average pass-through of those costs was 45%. If your contracts are silent on who absorbs a duty change, the default answer is usually you.

Track realised savings separately from negotiated ones

Report both numbers and the gap between them. It is uncomfortable the first time. It is also the fastest way to build finance's trust, because it shows you are measuring the thing they care about rather than the thing that flatters you.

Own the renewal calendar

Every contract, its end date, its notice period, whether it renews itself, and a review booked 90 days before each deadline. Most price creep happens at renewals nobody diarised.

#A twelve-month plan

#What not to do

1. Do not squeeze suppliers you have not checked. A supplier in financial difficulty is a supply risk, and the saving is worth less than the disruption.
2. Do not count cost avoidance as savings. Report it separately, against a baseline finance agreed, or it undermines everything else you report.
3. Do not set a savings target so aggressive that the only way to hit it is a bad deal. It will reappear as a quality or continuity problem later.
4. Do not cut the specification below what the business actually needs. That is a cost transfer, not a saving.
5. Do not treat savings as a once-a-year exercise. The leaks in Part 2 happen continuously.

The theme running through all five: a saving that damages the supplier, the specification or your own credibility is not sustainable by definition. It is borrowed from next year.