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What is Source-to-Pay?
Source-to-pay (S2P) covers the entire procurement process: from selecting and contracting suppliers to ordering, invoicing, and payment. It is the sum of two parts often encountered separately: Source-to-Contract (the strategic side) and Purchase-to-Pay (the operational side). Together, they form one continuous chain, from the initial supplier contact to the final payment. While it may sound like a technical process, it is primarily a matter of collaboration. Procurement, finance, and end-users within your organization all play a role in the chain and have different interests. A well-functioning S2P process ensures that these interests do not clash, but rather reinforce one another.
What are the benefits of Source-to-Pay?
A well-designed S2P process primarily means greater control. Control over your spending, control over contracts, and control over what is being ordered within your organization every day.
In practical terms, this translates to:
- Greater spend visibility. You know exactly what is being spent, with whom, and under what terms.
- Better contract compliance. Because procurement and contract management are directly linked to ordering processes, agreements are actually upheld.
- Less manual work. Invoices, approvals, and payments run more smoothly, with less room for error.
- Stronger negotiating position. With clear spend insights, you are in a stronger position at the negotiating table with suppliers.
Perhaps the biggest advantage is that you don't have to choose between control and efficiency. A good S2P process gives you both.
When should you implement Source-to-Pay?
An S2P project usually starts with a specific catalyst. Common triggers for organizations include:
- Your ERP system is reaching the end of its lifecycle and you need to make a change anyway.
- You have insufficient insight into what is being spent within your organization.
- Your organization is growing, but your procurement process isn't keeping pace.
- Procurement is handled decentrally by individual departments or branches, without any central oversight.
- New laws and regulations, such as the CSRD sustainability reporting, require greater control over your supply chain.
Important to note: an S2P project doesn't have to be a massive transformation right away. Sometimes, a targeted improvement in one area is enough to achieve significant results.
Who is Source-to-Pay essential for?
Source-to-pay affects almost every department and employee within an organization. For several roles, the process directly determines their daily work:
- Finance and procurement professionals deal with the consequences of a well- or poorly-designed process every day.
- CFOs and CPOs; they are responsible for cost control and strategic procurement decisions.
- (Semi-)public organizations; decentralized procurement and accountability often go hand in hand in this sector.
- Healthcare institutions; complex procurement chains and high workloads reinforce each other.
Do you work at an organization with many decentralized buyers, multiple procurement channels, or an upcoming ERP migration? Then there is a good chance that S2P is relevant for your organization as well.
Source-to-Pay versus Source-to-Contract, Purchase-to-Pay, and Procure-to-Pay
This is where most of the confusion arises. The terms are very similar, but they don't cover the same part of the process. We explain it for you below:
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