Sustainability as a Selling Point: What Business Customers Really Ask For

Why are business customers suddenly asking about sustainability?

Along with the quote comes a questionnaire: 40 questions on energy use, working conditions, suppliers, and emissions. The buyer adds that he cannot approve the order without the completed form. This is exactly how many owners experience sustainability in sales: not as a marketing topic but as an additional hurdle before the order.

The reason usually does not lie with the buyer himself. Large companies must know the risks in their supply chain, and banks must assess the sustainability risks of their borrowers. They pass this pressure down the line. Whoever supplies gets asked. Whoever answers well has an advantage over the competitor who leaves the form lying around. That raises one question: how does a mid-sized supplier make sustainability verifiable enough that it helps sales instead of holding up the order? To answer it, we first clarify what changed in the EU obligations in 2026 and who is asking, then examine whether business customers pay more for sustainability, and finally turn to the proof ladder, a worked example, and the line where greenwashing begins.

In B2B, sustainability is rarely a reason to buy, but increasingly a reason not to.

What changed in EU obligations in 2026?

The EU Corporate Sustainability Reporting Directive, CSRD for short, originally would have required tens of thousands of companies in Europe to produce extensive reports. With the so-called Omnibus I package, the EU scaled these plans back considerably. Following a provisional agreement in December 2025, the amending directive entered into force on March 18, 2026.

For small businesses this is good news and bad news. The good: their own reporting obligation is off the table for almost all of them. The bad: the questions from large customers remain, though in future probably within a more uniform and limited framework. If you know the voluntary standard, you know which data to prepare. Keep an eye on whether and when the delegated act finally applies.

Who else is asking besides customers?

Besides large customers, banks have taken up the topic. KfW, Germany's state-owned development bank, analyzed its SME panel for this purpose, a survey of around 13,000 companies conducted from February to June 2025. According to it, sustainability came up for 15 percent of SMEs that negotiated loans in 2024. The larger the business, the more often.

Among larger SMEs the share rose by 3 percentage points over the previous year. KfW expects banks to look more closely because of regulatory requirements and advises businesses of all sizes to record sustainability data in a structured way. For your sales team this means the data you prepare for the bank can also be shown to customers, and vice versa.

Do business customers pay a higher price for sustainability?

That is the question every owner wants answered. Research gives a nuanced answer. Goebel, Reuter, Pibernik, Sichtmann, and Bals (2018) studied 59 purchasing managers at multinational companies in Germany. They used a conjoint analysis in which respondents had to choose between supplier offers with different attributes and prices. The method is designed to prevent respondents from giving only socially desirable answers.

• There is a willingness to pay. On average, buyers were willing to pay a price premium for a supplier demonstrating compliance with sustainability standards, in this case the principles of the UN Global Compact.
• Social issues weigh more. Willingness to pay was higher for labor and human rights than for environmental issues.
• Independent confirmation counts. Whether a supplier backed its claims with certificates or audits changed willingness to pay, depending on which areas were confirmed.
• The buyer matters. Personal values and the culture in the purchasing department influenced willingness more than company, gender, or professional experience.

The authors explain this with risk. A buyer who purchases from a supplier with violations risks his company's reputation and possibly his own job. Solid proof reduces this risk and the effort for audits. The sample is small and limited to large companies, but the logic transfers well.

Two more recent studies add to this. Khan and Hinterhuber (2024) surveyed 372 purchasing managers from several countries and industries. Willingness to pay depended on personal values and external pressure, and it went hand in hand with better performance of the purchasing function. Zocco and Pedeliento (2026) surveyed 234 farmers about remanufactured machine parts. Perceived quality, warranties, and awareness of environmentally friendly production were decisive for purchase intent.

The proof ladder: how do you make sustainability sellable?

Instead of starting with big promises, I arrange a small business's options as a ladder. Each step builds on the one before, and even the first gives you an advantage in sales.

1. Step 1: Answer questions quickly and completely

   Create a folder of standard answers: energy use, occupational safety, suppliers, environmental permits, code of conduct. If you return a questionnaire in two days instead of three weeks, you stand out.

2. Step 2: Measure your own data

   Record a few metrics annually: electricity and heat consumption, fuel, waste, share of key suppliers with their own declaration. Use the voluntary VSME standard as a guide so the data match future requests.

3. Step 3: Quantify product benefits

   Calculate what your product saves the customer: energy over its lifetime, repairability, less scrap, longer service life. This is the strongest argument because it links sustainability to costs.

4. Step 4: Get independent confirmation

   Certificates, audit reports, or recognized labels take effort. They pay off mainly when important customers require them or you take part in tenders where they count.

Most small businesses already win on steps 1 and 3. The first saves the buyer work; the third gives him a figure he can use to justify the decision internally.

How do you calculate a sustainability advantage?

A worked example shows how an environmental argument becomes a cost argument. A manufacturer of compressed air systems offers a model that costs 4,000 euros more than the competitor's product but uses less electricity.

In this worked example, the customer saves 20,000 euros over ten years even though he pays more at purchase. At the same time, his electricity use falls by 120,000 kilowatt hours. For the buyer this is a figure he can show his managing director and, if necessary, his sustainability team. The price turns from an obstacle into an investment. The guide Quotes that win describes how to build such calculations into a convincing quote.

Where does greenwashing lurk in sales?

If you want to sell sustainability, you need to phrase things carefully. Since September 27, 2026, stricter rules for environmental advertising claims have applied in Germany. They stem from an EU directive and were implemented through the third amendment to the Act Against Unfair Competition (UWG). According to the IHK Halle-Dessau, claims such as “CO2-neutral” are no longer permitted if they are based on offsetting emissions. General terms such as “green” or “climate-friendly” require proof of recognized excellent environmental performance, and labels must be based on a certification scheme or set by public authorities.

How far the new rules reach in pure B2B business is something you should have checked legally. Regardless, competition law prohibits misleading claims toward business customers too. And for your reputation with a buyer who is used to proof, an unsupported claim is more damaging than none at all. The rules for testimonials and references, which must also be verifiable, are described in the guide Testimonials and references.

What does this mean for key accounts and tenders?

The topic has the strongest effect with a few large customers who are under pressure themselves. For them, you are part of their own supply chain. If you deliver data reliably here, you become harder to replace. The guide Key account management for SMEs describes how to develop such customers deliberately.

At the same time, large customers vet their partners more thoroughly than small businesses are used to. What you in turn should check with your own suppliers is covered in the guide Due diligence on business partners. And because many sustainability questions are really questions about the origin of inputs, the supply chain overview from the article Geopolitics as a business risk helps here too.

First steps for this week

Start with the questions already on the table. They show you what your customers really want to know.

• Collect all sustainability questionnaires from the past two years and note which questions keep recurring.
• Write standard answers to the ten most frequent questions and store them in one place sales can access.
• Compile last year's electricity, heat, and fuel consumption from the invoices.
• For your most important product, calculate what it saves the customer in energy or materials over its lifetime.
• Check your website, brochures, and quote templates for unsupported general environmental claims.
• Ask your three largest customers which sustainability data they expect from suppliers over the next two years.

The question posed at the start can be answered as follows: sustainability helps sales when you answer questions completely, measure your data, quantify product advantages, and have your claims independently confirmed. The studies show that business customers pay more mainly when evidence lowers their risk or their costs. Without evidence, sustainability remains a hurdle; with evidence, it becomes an argument.