An independent sales organization (ISO) is a third-party that helps you set up payment processing for your merchants through its acquiring relationship. Essentially, the ISO sits between your merchant and the companies that process card payments. Both Visa and Stripe say that ISOs work as agents for acquiring companies.
Depending on your merchant, you might need more assistance than the sign-up process for payment processing software provides. So the next time you hear the question, “What is an independent sales organization?” think about whether it can help your business find a better merchant account or payment processing software than you could find on your own.
What Is an Independent Sales Organization?
An independent sales organization, or ISO, is a sales and service intermediary in the card-payments ecosystem. Visa’s third-party-agent materials indicate that an ISO can solicit merchants, sell merchant accounts, provide customer service, offer merchant training, and sell point-of-sale (POS) terminals on behalf of an acquiring bank. Stripe’s definition of an ISO is similar to Visa’s: an ISO is a third party authorized to market and sell payment processing services to businesses.
For merchants, it is important to note that an ISO is not typically the same as the bank that holds the merchant relationship with the card companies. Visa’s materials indicate, for instance, that when sellers enter into services contracts with an ISO, they are contracting with the acquiring bank – the ISO is merely the acquiring bank’s agent. Thus, while the acquiring bank may be the entity that provides the majority of services to the merchant who signs up with the ISO, the ISO remains a separate entity.
How Does an ISO Fit Into the Payment Stack?
When a merchant accepts card payments from customers, they interact with several companies in the payment industry: an acquiring bank, a payment processor, payment software and hardware, and an ISO that packages those services together. Mastercard defines acquiring banks as the financial institutions that provide card acceptance services to merchants, while Stripe defines ISOs as intermediaries between businesses and institutions that provide payment processing services.
This is why ISO relationships can be somewhat confusing for new merchants. Depending on the specific ISO and their relationship with their processing and acquiring banks, a merchant may negotiate pricing and support with the ISO while having their payments processed by a third-party payment processor and their transactions sponsored by an acquiring bank. By not separating these services and companies within the payment industry, it is difficult for a merchant to properly compare offers from different ISOs or to understand each company’s pricing and support structures.
Independent Sales Organization Options Compared
| Role | What It Does | Best Use Case | Main Limitation |
|---|---|---|---|
| ISO | Sells and supports merchant processing on behalf of an acquirer | Merchants that want hands-on setup, pricing help, or account guidance | Quality varies widely by partner |
| Acquirer | Provides card acceptance services and merchant account sponsorship | Merchants that want direct acquiring relationships | Often less sales guidance for smaller merchants |
| Payment facilitator | Onboards merchants under a master payment relationship | Fast signup and simpler setup for smaller businesses | Less control over the underlying account structure |
| Processor / platform | Handles technical transaction processing and related services | Merchants focused on software, gateway, and processing tools | May not be the merchant-facing sales adviser |
The key takeaway is that an ISO is a distribution and support layer, not a replacement for the rest of the payments stack. Mastercard’s merchant guidance says merchants contact an acquirer to become a Mastercard merchant, while Visa’s materials clarify that ISOs act as agents on behalf of acquirers. Stripe’s payment-facilitator comparison is useful here, too, because it shows that ISOs and payfacs solve different merchant problems even when both appear to “offer payments.”
Why Merchants Work With ISOs in 2026
Many merchants decide to work with an ISO to get the kind of assistance with their accounts that is not provided to them when they work directly with a payment processor to create their account. Stripe, for instance, states that agents who work with ISOs often provide the same services as ISOs themselves but may earn a portion of the fees collected from merchants. Additionally, Fiserv states that ISOs have the flexibility to price the products that they provide to the merchants. Each of these entities can often work more closely with merchants to determine the best account structure for each merchant.
For merchants with more complex needs than the typical merchant working with a payment processor and flat-rate card reader, working with an ISO may be beneficial. For instance, a retail business looking to start collecting sales and managing inventory may benefit from working with an ISO to structure its account in the best possible way. However, the quality of the ISO approached by the merchant is important for facilitating account formation.
Who Should Consider Working With an ISO?
An ISO can make the most sense for merchants like these:
- merchants that need more guidance onboarding than a self-serve payment processing provider can offer
- merchants that are comparing various payment processing providers
- merchants with higher risk or more complex business models than the typical merchant
- retail or service business owners who want more pricing transparency from their payment processor
- merchants that want more hands-on account support after they are onboarded
An ISO is typically unnecessary for very small merchants who want as much simplicity as possible from their payment processing provider. However, as a merchant begins to care more about their pricing structure, hardware providers, and the responsiveness of their accounts department, it becomes more relevant to work with an ISO.
Stripe’s comparison between payment facilitators and ISOs makes a convincing case for working with an ISO if a merchant is looking for a more individualized approach to payment processing rather than the one-size-fits-all approach of a payment processing aggregator.
How Do Independent Sales Organizations Make Money?
They make money through revenue share on merchant processing volume, a markup on account pricing, or sales of equipment and software. Both Stripe and Fiserv state that agents will earn a share of the transaction fees for the businesses they onboard.
For the merchants, a good ISO can offer significant time and money savings. However, a bad ISO could cost them money due to the extra markup, or the ISO profits more from it than the merchant does. For these reasons, the quality of the ISO’s support and the transparency of their pricing structures are essential to evaluate when considering an ISO partnership.
How Much Does an ISO Relationship Cost?
There is no separate universal “ISO fee.” Instead, there are usually fees defined within the merchant’s relationship with their payment provider. This is one of the many reasons why each merchant should evaluate the total cost of their payment provider relationship, not the sales promise of the ISO that managed to land them.
The question is: what changes does ISO make for the merchant? If they end up with a more suitable account with their provider, better support, hardware options, and payment plans, then the ISO relationship provides value. However, if there is just one more layer between the merchant and the provider, then the ISO relationship could end up being an unnecessary cost to the merchant.
Common Independent Sales Organization Mistakes Merchants Make
The most common mistake is assuming that the ISO is the same as the processor, the bank, and all of the other components of the payments technology stack. These companies are not the same as the ISO. Merchants that do not separate these two entities often find it challenging to understand how to control pricing and the underwriting process for their business.
Another common mistake is choosing an ISO based on the salesperson’s sales style. While a salesperson may have a smooth sales pitch for the merchant, it does not provide the information required to understand the company’s sponsorship and support, pricing, and how the ISO will work for the merchant in the long term.
How to Choose the Right Independent Sales Organization in 2026
Confirm the ISO’s Sponsorship and Registration
The first question a merchant may ask about an independent sales organization is whether it is properly operating through a sponsoring acquirer. Visa’s materials, for instance, make clear that ISOs are agents of the acquirers through whom merchants will ultimately register and operate.
Understand Who Controls Pricing
Fiserv’s materials for ISO partners make clear that ISOs have some flexibility in the prices with which they offer merchants payment processing services. While this is beneficial for the ISO, merchants should be able to understand the difference between fees that will be pass-through to merchants versus those that are the ISO’s markup on the cost of acquiring merchants.
Ask How Underwriting Actually Works
While ISOs can take the lead in packaging the merchant company and its information for underwriting approval by an acquiring bank, the merchant should still understand how underwriting decisions are made by whom. Stripe’s information on ISOs and payment agents makes clear that while the ISO can take the lead in onboarding merchants, the acquiring company is still responsible for underwriting decisions.
Compare Support After Approval
Many merchants focus on sales and support for the company before the merchant signs the sales contract. However, after approval, ISO companies may offer additional support to merchants. Visa’s information on ISOs makes clear that they also provide training and customer service to merchants after they are approved.
Look Closely at Hardware and Software Fit
Depending on the ISO, they may have more experience in soliciting and selling POS terminals and software. This should be a point of consideration for the merchant to ensure that the ISO is not merely recommending their available products but that they have the best possible hardware and software solutions for that merchant.
Choose an ISO That Can Support Future Growth
An excellent consideration for any merchant is to ensure that the ISO company with whom they work can support their future growth with the same company. While Stripe has not published information specifically on ISOs but instead for payment agents in general, their information on how agent companies function makes it clear that the best ISOs are those that can consider the future of a company and its growth when accepting it as a merchant.
FAQs
Q: What is an independent sales organization?
A: An independent sales organization (ISO) is a company that markets, sells, and often supports the payment processing services for another company, technically the acquirer. Both Visa and Stripe refer to ISOs as agents or intermediaries for their customers in the payment processing space.
Q: What is an ISO in merchant services?
A: In merchant services, an ISO is the company that does the sales and support for merchants to get them set up with their merchant account and payment processing services. While the merchants will likely work with the ISO to do so, there are other elements of the process they will not interact with directly.
Q: How is an ISO different from a payment facilitator?
A: While payment facilitators will usually require merchants to join under a master payment relationship with the company, an ISO will work through the relationship between the acquiring company and the merchant. The acquiring company will provide the merchant with an account, but the ISO will assist in setting up that account.
Q: Do merchants sign with the ISO or the acquirer?
A: Since the ISO acts as the agent for the acquirer, the merchants will sign the service and product contracts with the acquirer when they agree to the terms with the ISO company. This is one of the reasons that it is important for merchants to know the sponsoring company for their accounts.
Q: When should a merchant work with an ISO?
A: A merchant should work with an ISO if they require the level of onboarding and support that the company offers, or if they simply need a merchant account that is better suited to their business than the standard self-serve payment processing software can provide.
Q: What should merchants compare between ISO companies?
A: To select an ISO company, merchants should compare a variety of factors, such as the sponsoring company of the merchant account, pricing, underwriting, support for the merchant after-sales, and the payment processing hardware and software that the ISO company recommends to merchants. Generally, the fit between the merchant and the various payment processing companies will be more important than any sales pitch they make when first approaching ISO companies.
Conclusion
The simplest answer to the question of what an independent sales organization is is that it is an intermediary between the merchant and the acquiring bank, typically working on the seller’s behalf to sell and provide services to merchants who wish to accept credit cards. However, the more complete answer is that they are valuable to merchants because they typically secure better accounts with acquiring banks and offer a better experience throughout the process.
If you are considering the best options for your merchant account and need assistance understanding whether an independent sales organization is the right model for your business, the Payment Nerds can provide insight. Finding the right model for your merchant account will ensure your business grows the way you want it to.
Sources
- Visa. “Third Party Agent Registration Program – TPA Types and Functional Descriptions.” Accessed March 2026.
- Visa. “Beyond the Acquirer: Additional Visa Acceptance Entities.” Accessed March 2026.
- Mastercard. “Interchange Fees and Rates Explained.” Accessed March 2026.
- Stripe. “What Is an Independent Sales Organization (ISO)?” Accessed March 2026.
- Stripe. “Payfacs vs. Independent Sales Organizations (ISOs): How They Are Different and How to Choose One.” Accessed March 2026.
