Tail Spend Management: Why Your P2P System Is Making It Worse

Search "tail spend management" and you'll find the same advice everywhere.

Consolidate suppliers. Expand your catalogs. Add approval layers.

Standard playbook. Logical steps. Consistently ineffective.

Because here's what no one wants to say out loud: the tools Procurement uses to manage strategic spend are actively working against you when it comes to tail spend.

Not because they're poorly designed. Because they were designed for a completely different problem.

The tail spend problem hiding in plain sight

Tail spend accounts for roughly 80% of transactions but only 20% of total spend value in most organisations.

High volume. Low value. Maximum administrative burden.

It's the software subscription that takes three weeks to approve. The one-off consultant invoice stuck in supplier onboarding. The emergency equipment purchase that bypasses the system entirely because the compliant route takes too long.

Procurement teams know exactly where tail spend lives. In the gap between policy and reality.

As one Procurement Director put it simply: "We've optimised for the big deals. Everything else just... happens."

That's not a people problem. That's an infrastructure problem.

Why catalogs can't solve tail spend

The traditional answer to tail spend chaos? Build bigger catalogs.

Get more suppliers onboarded. Expand your approved vendor list. Create more pre-negotiated options.

Sensible in theory. Unsustainable in practice.

Because tail spend is defined by its unpredictability. It's the suppliers you've never worked with, the services that don't fit existing categories the one-time needs that will never justify a formal sourcing process....the examples keep coming.

Trying to 'catalog' your way out of tail spend is like trying to predict every possible question your business will ask this year.

You can't. And the attempt creates exactly the friction you're trying to avoid.

When Buyers can't find what they need in the system, they stop looking. They email Finance directly. They use personal credit cards. They create shadow processes that work faster than the official ones.

This is how Procurement loses visibility. Not through defiance, but through design flaws.

The onboarding bottleneck no one talks about

Here's where tail spend management really falls apart: the handoff between Procurement and Finance.

Procurement approves a new supplier. Finance now needs to onboard them - vendor codes, bank details, tax information, compliance checks.

For a strategic supplier worth millions, that effort makes sense. For a £500 one-time purchase? It's bureaucratic theatre.

The business doesn't stop while Finance processes paperwork. So invoices arrive before suppliers exist in the system. Payments get delayed. Suppliers chase. Relationships sour.

And the real cost? The hours Finance teams spend manually processing exceptions that shouldn't exist in the first place.

One CFO described it this way: "We've built a Formula 1 pit crew for our major suppliers. Tail spend is still being serviced with a rusty wrench."

The system isn't broken. It's just solving the wrong problem.

What happens when you build for tail spend first

Most procurement platforms treat tail spend as an edge case. An exception to manage, not a reality to design for.

Axiom MarketPay flips that assumption.

Instead of forcing high-volume, low-value transactions through systems built for strategic sourcing, we asked a different question: what if the platform was designed for speed and volume from the ground up? What if an Agent actually did all the work for you?

No catalog? No problem.

MarketPay doesn't require Buyers to search through pre-approved catalogs or stop when they hit a dead-end.

Our Agents convert a free text requisition into exactly what's needed: description, business case, cost, without forcing it into rigid categories. The approval logic still runs. The controls still apply. The audit trail still exists.

The difference? Buyers don't abandon the process halfway through because it's easier to work around it.

Pay suppliers without the ERP nightmare

This is where Axiom's MarketPay module fundamentally breaks from traditional P2P systems.

Through the Axiom platform, our agents take care of the process - approved suppliers can be paid directly - no ERP onboarding required.

That £500 purchase that would normally take two weeks to set up in your financial system? Approved and paid in hours.

Finance maintains full visibility and control. Suppliers get paid on time. Procurement doesn't lose track of spend.

The loop actually closes. 

Integration that doesn't require rip-and-replace

Here's the problem with most "innovative" procurement solutions: implementing them means dismantling everything you've already built.

MarketPay integrates natively with your existing ERP, S2P or Orchestration Layer - working alongside your existing financial processes, not as a replacement for them.

Compliance features like sanction screening, KYC/KYB checks, and configurable approval workflows aren't bolted on. They're built in.

Because in a high-volume environment, compliance can't be a manual checkpoint. It has to be automatic.

The real cost of tail spend isn't the money

When Procurement leaders talk about tail spend, the focus is usually on savings opportunity.

"If we could just get 10% off that spend..."

But that's not where the real cost lives.

The real cost is in the accumulated friction. The hours Finance spends chasing supplier details. The Procurement time lost policing workarounds. The business frustration with processes that feel designed to slow them down.

The system creates drag. Drag creates workarounds. Workarounds erode control.

And the cycle continues.

The question for 2026: Are your systems designed for how buying actually happens?

Strategic spend will always need dedicated management. Category strategies. Supplier relationships. Negotiated contracts.

That maybe where most of your spend lies, but it's not where most of your procurement activity lives.

Most of it exists in the long tail. Fast-moving. Fragmented. Impossible to predict.

The organisations that will win in 2026 aren't the ones with the tightest controls. They're the ones whose systems make compliance easier than the workaround.

Where Buyers don't need to think about process because the process just works.

Where Finance doesn't spend Tuesday mornings chasing missing supplier details.

Where Procurement has visibility without needing to police behaviour.

That's not about better policy. It's about better infrastructure.

PO to Payment. In One Flow

Join us on 25th March for the live MarketPay launch,  and see the full tail spend process run end to end, in real time. 

Because the best procurement process is the one no one has to manage. 

Reserve your spot →