Key takeaways
This guide explains what source-to-contract (S2C) outsourcing means for contingent talent, and helps procurement and contingent program leaders decide what to hand to a provider and what to keep in house.
The S2C process typically runs in five stages: spend analysis, supplier identification and sourcing, bidding and negotiation, contract creation, and contract lifecycle management.
Enterprises most often outsource fast, high-volume, compliance-heavy contingent and services spend, while strategic categories typically stay in house.
When choosing a provider, look at scope and fit, speed to talent, pricing transparency, cost, classification and indemnification, global reach, and integration with your VMS or MSP.
Before an enterprise signs a talent or services contract, someone often has to find suppliers, compare them, negotiate terms, and put the agreement in place. Source to contract outsourcing means handing some of that upstream work to a specialist provider, often called a procurement outsourcing partner.
For procurement and contingent program leaders sourcing contingent talent and contracting statement of work (SOW) services, the question is which steps to hand over and which to keep. This guide covers the source to contract process, how it differs from procure to pay, and how to decide what to outsource and what to keep in house.
What is source-to-contract outsourcing?
Source to contract outsourcing means an enterprise brings in a specialist procurement outsourcing partner to run some or all of the upstream steps of procurement on its behalf: sourcing suppliers and talent (for example staffing agencies and independent contractors), running sourcing events, negotiating terms, and contracting, before procure-to-pay (P2P) handles ordering and payment. The enterprise often retains strategic direction and key approvals, while the provider brings its own people, expertise, and ways of working
Source to contract outsourcing is one form of procurement outsourcing, the broader practice of handing sourcing, contracting, supplier management, or other procurement activities to a third party, sometimes to reduce costs or sharpen focus on core competencies. It differs from S2C software. S2C software can automate or support parts of the process, but the enterprise’s own team typically still does the hands-on work, for example running bid events, reviewing responses, and managing contracts. With outsourcing, a provider’s team takes on some or all of that work instead
In the contingent workforce and services category, this is often described as services procurement outsourcing: an enterprise hands the sourcing and contracting of external talent and statement-of-work (SOW) services to a specialist provider, instead of running every supplier search, bid, and contract in house. Here, staffing agencies, consultancies, and other service providers are typically the suppliers being sourced – an SOW defines the scope, deliverables, timeline, and terms of a services engagement.
This is usually narrower than full-spend procurement business process outsourcing (BPO), where a provider may take responsibility for buying activity across many (or even all) spend categories.
The source-to-contract process, stage by stage
The source-to-contract process typically runs through five stages: spend analysis, supplier identification and sourcing, bidding and negotiation, contract creation, and contract lifecycle management (CLM). Many organizations treat an executed contract or approved supplier agreement as the hand-off to procure-to-pay, while contract lifecycle management continues after signature.
A typical S2C process in enterprise companies:
1. Spend analysis
Reviewing historical and current spend data to understand what the enterprise buys, from whom, at what volumes, and at what rates. An outsourcing provider can often run this analysis and identify savings or consolidation opportunities.
2. Supplier identification and sourcing
Finding, screening, and evaluating potential suppliers against the business need. A specialist provider can bring category expertise, market insight, and supplier-market knowledge.
3. Bidding and negotiation
Issuing requests for information, proposal, or quotation, often grouped as RFx, and negotiating commercial terms. A procurement partner can run these events, evaluate responses, and support negotiation.
4. Contract creation
Turning agreed terms into a formal agreement, such as a master service agreement (MSA), statement of work (SOW), or another contract type suited to the category. A provider can coordinate drafting, redlining, and routing; the enterprise’s legal, procurement, and business stakeholders typically retain approval and final sign-off.
5. Contract lifecycle management
Tracking obligations, compliance, performance, renewals, amendments, and eventual renewal-or-exit decisions after signature. A provider can administer these activities, while the enterprise usually remains accountable for the relationship and outcomes.
Source-to-contract vs procure-to-pay
Source-to-contract is typically the upstream, more strategic half of procurement: identifying needs, sourcing suppliers, negotiating, and contracting. Procure-to-pay is the downstream, more transactional half: requesting, approving, ordering, receiving, and paying.
You may also come across source-to-pay (S2P). S2P combines S2C and P2P into one end-to-end view of procurement, and these three terms often come up together when enterprises compare software and providers.
Where one process ends and the other begins can vary by organization. Some treat contract management as part of source-to-contract, while others assign it to procure-to-pay or a separate contracts team. For contingent talent and SOW spend, downstream steps often include approving timesheets or milestones and paying invoices.
Aspect | Source to contract (S2C) | Procure to pay (P2P) | Source to pay (S2P) |
|---|---|---|---|
Where it sits | Upstream | Downstream | End to end |
Core activities | Sourcing, negotiation, contracting | Requesting, approving, ordering, receiving, paying | Both |
Nature | Primarily strategic | Primarily transactional | Both |
Hand-off point | Typically ends at an executed contract or approved supplier agreement | Often begins with a purchase request. It may operate within an existing contract, but purchases can also occur without one | Combines both processes |
Good to know: In an S2C outsourcing arrangement, the upstream activities are the ones a provider may take on. That is why understanding where source-to-contract ends and procure-to-pay begins is a useful first step in scoping the work.
Why enterprises outsource source to contract
Enterprises often consider outsourcing source-to-contract for four reasons: the potential for better pricing and terms through a provider’s combined buying volume, deeper category and market expertise, additional capacity and speed for stretched teams, and stronger controls that can help reduce maverick spend, meaning off-contract buying outside negotiated terms and rate cards.
Savings and better terms: A procurement outsourcing provider may buy for many enterprise clients, which can create opportunities to aggregate compatible demand and bring greater leverage to supplier negotiations than a single enterprise might have on its own. This is one reason providers can sometimes negotiate better prices, particularly where an enterprise’s own spend is small, infrequent, or fragmented.
Expertise: Providers that work in the same categories across many clients may bring deep category knowledge and current market insight, such as a view of fair rates for a particular role or region. That can be valuable where an in-house team does not have the time, scale, or specialization to build that expertise itself.
Speed and capacity: When procurement and HR teams are managing open requisitions, renewals, and supplier negotiations at the same time, a provider can add capacity without requiring the enterprise to hire immediately. Some programs also pair outsourcing with direct sourcing, where the enterprise builds and reuses a talent pool of known, proven contractors.
Less maverick spend: When defined buying steps, approved suppliers, and agreed terms or rate cards are used consistently, there may be less room for hires and purchases outside them. This can help reduce off-contract spend, although it depends on clear processes, adoption, and ongoing governance.
These benefits are not automatic: outsourcing generally does not deliver the same results everywhere, and outcomes depend on the provider, the category, and how clearly the work is scoped. For context, the Hackett Group’s 2025 Digital World Class Matrix assessed 15 AI-enabled procurement outsourcing providers, and found that end users reported an average 23% improvement in purchase cost savings and cost avoidance. That figure is self-reported, relates to procurement outsourcing broadly rather than contingent talent specifically, and does not mean every arrangement will achieve similar results.
What to outsource versus keep in house
A common approach is to keep the most strategic categories in house and consider outsourcing speed-, volume-, and compliance-heavy contingent and services spend to a specialist provider. The table below shows factors that can point one way or the other.
Factor | When to keep source-to-contract in house | When to consider source-to-contract outsourcing |
|---|---|---|
Strategic importance | The category is core to the business or tied to key supplier relationships | The category is routine, and supplier choice rarely changes the business outcome |
Volume and repeatability | Spend is low-volume, one-off, or highly bespoke | Spend is high-volume and the steps repeat, such as ongoing talent requests and renewals |
Speed | Needs can follow a standard internal timeline | Roles or projects need to start in days rather than months |
Compliance and admin load | Engagements are mostly local, with little cross-border or classification exposure | Engagements span multiple countries and involve substantial contracting, classification, and administrative work |
Internal capacity | The team has the bandwidth and category expertise | The team is stretched or lacks current market and rate data |
Defined outcomes (SOW work) | The scope keeps shifting or is closely tied to internal teams | The deliverable, milestones, and acceptance criteria can be defined up front, making it easier for a provider to manage sourcing and contracting |
In practice, this means assessing each spend category against these factors rather than deciding for an entire program at once. Categories with high volume, repeatable steps, and significant compliance or administrative demands are often stronger early candidates for outsourcing, while categories closest to core strategy often remain in house.
For how these choices fit into the wider program, see our guide to the contingent workforce operating model.
What to look for in a source-to-contract outsourcing partner
Choosing a source-to-contract outsourcing partner comes down to a handful of practical questions: how quickly it can deliver, how clearly it prices its services, how it approaches worker classification, where it can engage talent, and how well it fits with the systems you already use.
Scope and fit
Ask which of the five S2C stages the provider actually runs and which remain with your team. The goal is a scope that matches the work you genuinely want to hand over, rather than a broad label such as “end-to-end outsourcing”.
Speed to talent
Ask how quickly the provider fills roles, how it defines and measures time-to-fill, and what conditions affect that figure. For reference, Lifted’s average time-to-fill is under 3 days.
Transparent pricing
Ask for a clear explanation of the pricing model, including any markup, platform fee, management fee, or other charges, so proposals can be compared like for like.
Cost
Ask how rates compare with your current suppliers, what is included in the rate, and which savings assumptions apply to your category and geography. For instance, Lifted engagements are typically 10–30% more cost-effective than standard legacy suppliers.
Classification and indemnification
Ask how the provider approaches worker classification, who reviews classifications, how often they are reassessed, and exactly what indemnification covers. For reference, Lifted processes more than 20,000 worker classifications per year.
Global reach
Ask which countries and engagement models the provider supports, and confirm that the specific worker type and country you need are covered. Lifted can engage contingent talent across 180+ countries and support engagement models including independent contractors, staff augmentation, AOR, EOR, and SOW.
Integration
Ask whether the provider can work within your existing VMS or MSP program, which systems it integrates with, and what implementation effort is required. For example, Lifted is designed to plug into your existing VMS or MSP like any other supplier, without disruption.
To see how this can play out, one global technology company’s Creative AI division had been renewing contracts repeatedly to evaluate thousands of AI-generated images. Lifted reduced more than 150 contracts to one streamlined engagement model with a dedicated group of specialists, helping the team scale on demand with less administrative work.
How Lifted supports source-to-contract outsourcing for contingent talent
Lifted, an Upwork Company, is a tech-enabled contingent workforce supplier that sources and engages external talent in 180+ countries and delivers outcome-based teams. Enterprises can work with one supplier instead of running a separate search and contract for every need, and choose the engagement model that fits the work.
Which Lifted engagement model fits which need?
Independent contractors (IC)
For project-based work. Enterprises can search Lifted’s talent pool or bring pre-identified freelancers, with onboarding, contracts, and payments in one place. See how Lifted helps enterprises engage independent contractors.
Staff augmentation
For temporary talent that works under the enterprise’s direction. Lifted can deploy individuals or full teams across regions, working inside the enterprise’s existing VMS or MSP program. Learn more about staff augmentation.
Employer of Record (EOR)
For workers who should be employees where the enterprise has no local entity. Lifted and its EOR partners can act as the legal employer, handling payroll, employment contracts, benefits, and taxes in line with local rules. See Employer of Record.
Agent of Record (AOR)
For independent contractors engaged and paid on the enterprise’s behalf, without Lifted employing them. An AOR typically takes on defined classification responsibilities and, depending on its contract terms, may indemnify defined misclassification liability. Lifted assesses each worker to see whether the contractor model fits and can route the engagement to EOR where an employee model fits better. Learn more about our Agent of Record solution.
Outsourcing
For outcomes rather than extra hands. Lifted assembles, leads, and manages an outcome-driven team around a defined project or function, aligned to the enterprise’s KPIs, under one contract and with no internal headcount added. The difference from staff augmentation is who directs the work; see staff augmentation vs outsourcing.
Because Lifted works as a supplier inside an existing VMS or MSP program, an enterprise can keep its own S2C strategy and approvals while handing defined talent and services work to one supplier.
Ready to hand a defined project or function to one team? Explore Lifted’s Outsourcing to see how outcome-driven teams work under one contract, without adding headcount.
Frequently asked questions
What is the difference between source to contract and procure to pay?
The main difference between source to contract and procure to pay is where each sits in the buying process. Source to contract is the upstream, strategic process of sourcing suppliers, negotiating, and contracting, while procure to pay is the downstream, more transactional process of requesting, approving, ordering, and paying. An executed contract typically marks the hand-off between them.
What is source to pay?
Source to pay (S2P) is the end-to-end process that combines source to contract and procure to pay, from sourcing and contracting through ordering and payment, so one process covers the full buying cycle.
Does source to contract outsourcing cover statements of work?
Yes, source to contract outsourcing can cover statements of work. Services procurement outsourcing often covers services bought under SOWs, where the enterprise buys a defined deliverable or outcome, though scope varies by provider.
Can source to contract outsourcing work alongside an existing VMS or MSP?
Yes, source to contract outsourcing can work alongside an existing VMS or MSP. If your enterprise already runs a vendor management system (VMS) or managed service provider (MSP), Lifted is designed to plug into your VMS like any other supplier, without disruption, and the same holds for MSP managed programs. A VMS typically governs a program rather than sourcing talent, so a supplier covers contingent workforce sourcing for the contingent workforce program.
Author
Lee Willoughby is the Senior Marketing Director at Lifted, an Upwork company helping enterprises source, engage, and manage contingent talent across every contract type. With a background as a co-founder and workforce technology entrepreneur, Lee focuses on the future of contingent workforce management, helping organizations navigate the complexities of global talent, compliance, and workforce transformation.
This content is for general informational purposes only, and is not intended to be and should not be viewed as legal or tax advice. Readers should contact their attorney or tax professional to obtain advice with respect to any particular legal or tax matter. Information discussed can change frequently, and Lifted cannot guarantee that all information is current at all times.
