When MSPs compare payment processors, the conversation usually starts and ends with the rate. A percentage and maybe a per-transaction fee go into a spreadsheet, and the lowest number wins.
The rate is the visible tip. Below it sit costs that are harder to see and often larger: the cash you wait for, the time you spend when something breaks, and the revenue that stalls when a payment fails. Total cost of ownership, or TCO, is the practice of counting all of it.
Total cost of ownership is everything a processor costs your business over a defined period, not only what it charges per transaction. It includes direct fees, the cost of waiting for settlement, the staff time spent on support issues, and the cost of payments that fail.
For an MSP, this matters more than for most businesses. Billing is recurring, invoices are often large, and the same customers pay month after month. Small inefficiencies repeat on every cycle, so they compound.
Start with the structure, because the same volume can cost different amounts under different structures.
A blended rate gives one percentage for everything. It is simple to read, and it can hide how much of that rate is the card networks' cost and how much is the processor's margin. Interchange-plus separates the two: the card network's cost passed through, plus a stated processor fee. Which one is cheaper depends on your volume and the mix of cards your clients use, so the honest answer is to calculate it with your own numbers.
Then look beyond the rate. Ask about monthly or gateway fees, compliance fees, chargeback fees, ACH fees, and any charges for statements, support tiers, or early termination. The most useful number is the effective rate: total fees paid in a month divided by total volume processed. It is the one number that captures everything.
Settlement time is the gap between a client paying and the money reaching your account. It looks like a technicality, and it is really a cash flow cost.
A quick illustration. An MSP processing $100,000 a month with a two-day settlement delay has roughly $6,700 in earned, paid revenue in transit at any given time. That is money you cannot use for payroll or vendor invoices. At $500,000 a month, the same delay is about $33,000. The gap scales with the business and has nothing to do with how promptly clients pay.
It also affects how you measure collections. Days sales outstanding does not stop when the client pays. It stops when the funds are available to you. Settlement timing belongs in the comparison next to the rate.
Support is the cost people discover after they sign. When a deposit goes missing, a batch fails, or a client disputes a charge, someone on your team spends time resolving it, and that time has a price.
To compare processors, ask concrete questions. How do you reach a person, and how long does a typical issue take to resolve? Is there a named contact for billing issues? What happens during your monthly billing run if something breaks, and how quickly is it fixed? A processor with a lower rate and slow support can cost more than one with a higher rate and fast answers, once staff hours are counted.
A failed payment is more than a missed transaction. It starts a chain of work: noticing the failure, contacting the client, retrying, and updating the card or bank details. Each step costs staff time, and cash arrives later than planned.
There are indirect costs too. A client whose payment keeps failing may be treated as a collections problem when the cause was an expired card. Some clients are lost to friction, not dissatisfaction.
To count it, estimate how many payments fail each month, multiply by the minutes your team spends on each, and add the cost of delayed cash. Then ask each processor what it offers to reduce failures: automatic retries, card update services, and clear failure reasons your team can act on.
Put both on the same 12-month view, using your own numbers. A simple worksheet covers it:
Add them up for each option. The lowest rate rarely has the lowest total.
Many failed and disputed payments begin upstream, with an invoice the client did not expect. A client who questions a charge pays late or disputes it, and that adds cost no processor can remove. Accurate invoices reduce the friction that processors then have to absorb.
That is where reconciliation comes in. Reconcile compares vendor invoices against your billing agreements, so differences are caught before a client sees them. It does not change how a payment is processed, but it does change how often a payment starts with a question.
What is total cost of ownership for a payment processor? It is the full cost of using a processor over a period of time, including processing fees, the cost of waiting for settlement, staff time on support issues, and the cost of failed payments, not only the per-transaction rate.
What is the difference between blended and interchange-plus pricing? A blended rate is one percentage covering everything. Interchange-plus separates the card networks' cost from the processor's own fee. Which is cheaper depends on volume and card mix, so MSPs should compare using their own transaction data.
How does settlement time affect an MSP's cash flow? Settlement time is the delay between a client paying and the funds reaching your account. A two-day delay on $100,000 of monthly volume leaves roughly $6,700 in transit at any time, which is money unavailable for payroll or vendor bills.
How do you calculate the cost of failed payments? Estimate the failures per month, multiply by the minutes your team spends on each, value that time, and add the cost of delayed cash. Then compare what each processor offers to reduce failures, such as retries and card update tools.