What You Should Know: Tier 1 vs Tier 2 Supplier Diversity Spend

Most supplier diversity programs are built around what’s easiest to measure: the diverse suppliers you contract with directly. But if that’s where your reporting stops, you’re leaving a significant portion of your program’s impact on the table and making it harder to defend your program’s value when leadership asks for more than a spend percentage.

Understanding the difference between Tier 1 and Tier 2 diversity spend is one of the most practical steps a supplier diversity leader can take to expand program impact, satisfy government reporting requirements, and build the kind of defensible, audit-ready numbers that earn executive confidence. This post breaks down both tiers, explains how Tier 2 spend gets reported, and shows what a complete picture of diverse spend actually looks like.

What is the difference between Tier 1 and Tier 2 supplier diversity spend?

Tier 1 diversity spend is what your organization pays directly to certified diverse suppliers. Tier 2 diversity spend is what your prime (Tier 1) suppliers pay to their own diverse subcontractors — spend that flows through your supply chain indirectly but still reflects your program’s reach.

Every company is part of a larger supply chain that includes third-party product and service providers. Some of those suppliers, known as prime suppliers, work directly with the company; others are one or more steps — or tiers — away. Although prime suppliers are the most immediate priority for supplier diversity programs, the potential for impact scales quickly when you consider Tier 2 and beyond.

Understanding how to report and track diversity spend by tier is vital to maximizing the success of your program.

What is a diverse supplier?

A diverse supplier is a business that is at least 51% owned and controlled by an individual or group from a historically underrepresented community. To count toward a corporate or government supplier diversity program, that status is typically verified through third-party certification from a nationally recognized agency. The most common certification categories include minority-owned (MBE, certified through NMSDC), women-owned (WBE/WOSB, certified through WBENC or the SBA), veteran-owned (VBE/SDVOSB, certified through NaVOBA or the SBA), LGBTQ+-owned (LGBTBE, certified through NGLCC), and disability-owned (DOBE, certified through Disability:IN). A business may hold more than one certification, and Supplier.io’s data enrichment pulls from more than 450 sources to keep certification status current as ownership and credentials change.

Tier 1 Spend Explained

Tier 1 suppliers come in many forms: the tech company whose software and hardware you use to run your organization; the manufacturer that delivers a key component for your product; the small business that landscapes your grounds; the consulting firm that offers specialized knowledge; and so on.

A typical large business will contract hundreds, even thousands of Tier 1 suppliers, making them the most immediate gauge of supplier diversity.

The number of diverse suppliers under contract can be tracked, as can the percentage of diverse businesses in the overall supplier portfolio. Spend can be measured in dollars and as a percentage of total procurement.

Despite the straightforward sound of these tasks, challenges abound. Tracking these metrics across a large, dynamic supplier base is a considerable operational lift. And confirming that a Tier 1 supplier is diverse — and stays diverse — is harder than it sounds. The business you contracted with three years ago may have experienced an ownership change and no longer qualify. Without continuous data monitoring, your numbers drift out of date without you knowing it.

Dedicated supplier diversity software solves this by continuously enriching your supplier data against certification registries and flagging status changes as they happen. This enables your Tier 1 spend numbers to reflect reality, not just a snapshot from last quarter’s audit.

Tier 2 Spend Explained

Tier 2 suppliers are your suppliers’ suppliers.

Although they’re only tied to your business indirectly, they play an important role in your supply chain’s resilience. If a key Tier 1 supplier doesn’t have the materials it needs to manufacture its component for your production line, they either temporarily halt production or scramble to find another supplier.

Tier 2 supplier diversity reporting gives programs a view of how diligent their Tier 1 suppliers are at contracting their own diverse partners.

For government contracts, Tier 2 suppliers are an accepted inclusion in an organization’s overall diverse spend, and this practice is expanding to the private sector. The significance: it allows large, non-diverse prime suppliers to indirectly contribute to your supplier diversity requirements. It also gives programs more substantive criteria to include in supplier assessments and prequalifications.

According to Supplier.io’s Best Practices for Supplier Diversity report, a majority of supplier diversity professionals now track Tier 2 spend, and a growing share consistently include Tier 2 diversity clauses in contracts with prime suppliers and provide active support to help primes improve their own diverse sourcing.

The challenge is the data. Accessing accurate, timely Tier 2 supplier diversity information requires prime suppliers to actively report their own diverse subcontractor spend, which they won’t do without a structured, easy-to-use mechanism to collect it.

Direct vs. indirect Tier 2 spend

Not all Tier 2 reporting works the same way. There are two accepted methods, and understanding the difference matters for reporting credibility and audit-readiness.

Attributable (direct) method: The prime supplier tracks and reports only the diverse subcontractor spend that is directly associated with your specific contract. This is the more precise approach because spend is tied to a specific buyer-supplier relationship, making it easier to verify and defend in an audit.

Allocation (indirect) method: A proportional share of the prime’s total diverse spend is attributed to your organization, typically based on your share of that prime’s overall revenue. This method is more common in large programs where contract-by-contract attribution is impractical, but it carries more estimation risk and can be harder to substantiate under scrutiny.

The attributable method is more defensible. The allocation method is more scalable. Many mature programs use both depending on the size and nature of the prime relationship.

This is exactly where Supplier.io’s Tier 2 Reporting capability comes in. It gives prime suppliers a streamlined web-based portal to submit their diverse subcontractor data, and it combines that Tier 2 spend with your Tier 1 data into a single, consolidated view. It’s accurate enough to meet government reporting requirements, and structured enough to hold up to internal and external audit.

How much do leading companies spend on diverse suppliers?

According to Supplier.io’s own research, companies spend an average of 3.6% of procurement with certified diverse suppliers, with best-in-class programs reaching 9.1%. The gap between average and best-in-class is significant — and it’s closing, as more organizations move from treating diverse spend as a compliance checkbox to embedding it as a core sourcing strategy.

But spend percentage alone tells an incomplete story. A program that spends 5% with diverse suppliers and can translate that into jobs created, wages supported, and tax revenue generated in the communities it sources from is a far more defensible program than one that reports a percentage and stops there. That’s the shift supplier diversity leaders increasingly need to make — from spend reporting to impact reporting — and it’s one of the most effective ways to secure executive support and budget for the program long-term.

Tier 1 vs. Tier 2: a side-by-side example

Consider a large healthcare system that contracts with a facilities management firm — a large, non-diverse Tier 1 supplier — to handle building maintenance across its hospital network.

Tier 1 spend: The healthcare system pays the facilities firm $10M annually. The facilities firm is not diverse, so none of that $10M counts as direct diverse spend.

Tier 2 spend — direct (attributable): The facilities firm subcontracts its electrical work to a certified minority-owned business specifically to fulfill the healthcare system contract. That subcontract is worth $800K. The healthcare system can claim $800K in attributable Tier 2 diverse spend.

Tier 2 spend — indirect (allocation): The facilities firm spends 12% of its total procurement with diverse subcontractors across all clients. The healthcare system represents 8% of that firm’s total revenue. Using the allocation method, the healthcare system claims 8% × 12% of the firm’s total diverse spend as indirect Tier 2 credit.

In both cases, the healthcare system’s diverse spend impact extends well beyond its direct supplier contracts — but only if it has the reporting infrastructure to capture it. Without a structured Tier 2 program, that $800K in attributable impact simply goes uncounted.

How Supplier.io helps you track Tier 1 and Tier 2 spend

Accurate Tier 1 tracking is fundamentally a data problem. A large organization may have hundreds of diverse suppliers in its base at any given time — some certified, some with expired certifications, some that have changed ownership since you last checked. Supplier.io’s Data Enrichment continuously verifies certification status against 450+ sources, so your Tier 1 spend numbers reflect what’s actually true today. Combined with Spend Analytics, you get a real-time view of diverse spend performance against your program goals — without manual data reconciliation before every reporting cycle.

On the Tier 2 side, Supplier.io streamlines the collection of indirect spend data from your prime suppliers through an easy-to-use reporting portal, then consolidates it with your Tier 1 data into a single defensible record. And because spend percentage alone isn’t enough to justify and grow a program, Supplier.io’s Economic Impact Analysis translates your total diverse spend — Tier 1 and Tier 2 — into the metrics that actually move executives: jobs supported, wages generated, and tax contributions to the communities where your suppliers operate.

That’s the difference between a program that reports a number and a program that tells a story.