Back office business process outsourcing hands a company's accounts payable, receivables, bookkeeping or payroll to a specialist firm that runs the work with its own staff, usually in a lower-cost location, for less than the company would spend doing it itself. The savings are real and smaller than the pitch: The Hackett Group's 2022 study of outsourcing clients found savings in the single digits in the first year of a contract, rising to about 10 percent a year after that. The reasons companies outsource are shifting as well. In Deloitte's 2024 Global Outsourcing Survey, 34 percent of organizations named cost savings as their main reason to outsource, down from 70 percent in Deloitte's 2020 survey. And the model itself is under pressure, because the thing outsourcing arbitrages, the hour a person spends on a transaction, is the thing AI reduces.
What back office business process outsourcing is
Finance and accounting outsourcing grew out of large companies' own offshore back offices. Genpact, a large finance and accounting outsourcer, began in 1997 as a 20-person pilot inside GE Capital, serving GE's financial services business from India. It became independent in 2004, when GE sold stakes to private equity investors, and listed on the New York Stock Exchange in 2007. The model it scaled is the one most outsourcing contracts still follow: a provider takes over a defined process, moves the work to a delivery center, runs it with trained staff under its own management, and reports against service levels.
The contract can be priced in several ways. The oldest is per full-time employee, where the buyer pays for the provider's people. Per-transaction pricing charges for each invoice processed or each payment applied. Fixed fees cover a defined scope for a set price. Outcome-based pricing ties the fee to a measured result such as days sales outstanding or cost per invoice. The pricing model decides who benefits when the work gets easier to do, which matters a great deal once AI starts changing how much work each case takes.
What the savings are made of
The savings come mostly from labor arbitrage. The Hackett Group describes finance and accounting outsourcing contracts as having historically focused on cost optimization and labor arbitrage: the same work, done by people who cost less, with the provider spreading its management and tools across many clients. Cost is still the main reason finance teams sign: in the same Hackett study, 53 percent of finance and accounting outsourcing customers began their contracts to reduce cost, against 28 percent who began them to change how the function works. A slow first year is what the start-up costs of outsourcing would lead a buyer to expect. The transition takes months of parallel running and documentation. The company keeps a team to manage the provider, check its work and handle what it escalates. And the knowledge of how the process works, including its exceptions, moves to the provider's staff.
Some of that knowledge comes back, at a cost. Deloitte's 2024 survey found that 70 percent of organizations had brought some outsourced work back in house in the previous five years, most often to control service quality or to build capabilities internally. Deloitte is careful to say this is not mainly dissatisfaction, and it notes that moving work back carries its own knowledge-loss risk. The pattern still tells a buyer something: an outsourcing decision is often revisited, so the contract should assume the work may move again.
Why AI is repricing outsourcing
One of the clearest public signals came from a buyer. In February 2024, Klarna said its AI assistant had handled two-thirds of its customer service chats in its first month, doing the equivalent work of 700 full-time agents, by the company's own count. The outsourcers have since said the same thing in their own filings. Genpact told investors in its 2025 annual report that it expects some of the services it performs for clients to be replaced, in whole or in part, by AI, and warned that clients may not accept new pricing models for AI-enabled work. Its results show the shift under way: in the second quarter of 2026, its core business services grew 1.9 percent while its AI-led advanced technology solutions grew 24 percent.
The market data points the same way, with a caveat. ISG's index of large outsourcing contracts found that business process outsourcing contract value fell 14 percent in 2025, to $7.3 billion, and by mid-2026 ISG was describing labor-intensive outsourcing work as increasingly displaced by large language models, even as contract value rebounded in the second quarter. Demand for outsourcing hasn't collapsed. What is changing is what the buyer pays for, and when Capgemini agreed to buy the outsourcer WNS for $3.3 billion in 2025, it described the market as moving away from labor-intensive delivery toward transaction-based, subscription-based and outcome-based pricing.
Outsourcing a process and automating it are different contracts
An outsourcing contract priced per employee or per hour pays the provider for the labor, so the provider's revenue falls when the labor does. A provider under that contract can still use AI, and many do, but the productivity gain belongs to the provider unless the contract says otherwise. Deloitte found that only about a quarter of companies using AI in outsourced services were seeing lower vendor costs, and it advises buyers to track their providers' AI productivity gains and negotiate lower prices to match. The mechanism exists: Genpact's 2025 annual report notes that some of its agreements already require minimum productivity benefits to be passed on to clients, so the clause is available to buyers who ask for it.
The alternative is to buy the outcome directly. A services-as-software firm runs the process with agents, keeps people on the exceptions, and is paid on the result, so the productivity gain and the fee move in the same direction. We set out the category in SaaS is dead: long live services-as-software, and the pricing logic behind it in the unbillable hour.
How to decide between outsourcing and automation in 2026
Four questions settle most cases. The first is volume and stability: a process that runs thousands of times a month with known rules, such as invoice processing or cash application, is a candidate for automation, and we walked through both in procure to pay and order to cash. The second is judgment: a process where most cases need an expert's call, such as multi-jurisdiction tax, may still be better outsourced to specialists. The third is the systems: automation works on the company's own systems, while outsourcing often adds the provider's. The fourth is control: an automated process keeps its knowledge inside the company, in the agent's rules and its record of every case, while an outsourced one keeps it in the provider's staff. Outsourcing keeps real advantages where they apply, such as round-the-clock coverage, languages a company can't hire for, and capacity for seasonal peaks, and a company with those needs may reasonably keep a provider for them while automating the rest.
A reasonable counter, answered
A reasonable counter is that the outsourcers are adopting AI themselves, so a company can buy an AI-enabled outsourcing contract and get both the automation and the people, without building anything. For some buyers that is the right answer, and the large providers have the scale to do it well. The question is who keeps the gain. Deloitte's finding that only about a quarter of AI-using buyers see lower vendor costs suggests that, under most current contracts, the provider does. A buyer taking this route should write the productivity gain into the contract, either as a price that falls on a schedule or as a fee tied to outcomes, and should expect people to stay on the hard cases: Klarna's chief executive said in 2025 that the company was recruiting again so customers could always reach a human. The work is being split between agents and people either way, and the contract decides whether the buyer pays for the split or profits from it.
Common questions
- What is business process outsourcing?
- Business process outsourcing is the practice of contracting a specialist firm to run a business process on a company's behalf, usually with staff in a lower-cost location. In the back office, the common candidates are accounts payable, accounts receivable, bookkeeping, payroll and customer service. The outsourcer supplies trained staff, management and often its own tools, and it is paid per full-time employee, per transaction, as a fixed fee or, increasingly, on outcomes. The company keeps responsibility for the results, and it keeps a small team to oversee the provider.
- What are the benefits of business process outsourcing?
- The main benefit is lower labor cost, since the work moves to a location where wages are lower and the provider spreads management across many clients. The Hackett Group found that outsourcing clients typically save in the single digits in the first year of a contract and about 10 percent a year after that. Outsourcing can also add capacity quickly, cover skills a company can't hire and give a growing business a process that already has controls. The costs are less visible: the transition, the team that manages the provider, and the process knowledge that leaves the company with the work.
- Should a company outsource accounts payable or automate it?
- In 2026 the better first question is how much of the work can be automated, because outsourcing moves the manual work to cheaper hands without removing it. Accounts payable is high-volume and rule-based, with a measurable exception tail, which makes it a strong candidate for automation. Outsourcing still makes sense for work that is irregular, highly specialized or too small to justify building anything. The two can combine, with people handling the exceptions an agent routes to them, but only under a contract that pays for results rather than hours.