CPA Firm Saves 38% on Processing with Interchange Optimization

The Challenge

David K. is the managing partner of a 14-person CPA firm in the Southeast that provides tax preparation, bookkeeping, audit, and advisory services to small and mid-size businesses. The firm processes roughly $1.8 million in annual card payments — the bulk of which are retainer fees, quarterly tax preparation invoices, and advisory engagement deposits.

For years, the firm used a regional processor with bundled pricing at a flat 3.1% + $0.25 per transaction. The rate seemed competitive when they signed up, but David had never seen a breakdown of what was going to interchange versus processor markup. Monthly statements were a single line item — total fees — with no visibility into the underlying cost structure.

The firm's payment mix made this particularly costly. Approximately 70% of incoming payments came from corporate cards and purchasing cards issued by the firm's business clients. These card types carry specific interchange rates that can be significantly reduced when merchants submit enhanced transaction data (Level II or Level III). The previous processor was not submitting any enhanced data — meaning every corporate card transaction was settling at the highest possible interchange tier.

David estimated the firm was paying roughly $55,800 per year in processing fees. For a professional services business with carefully managed overhead, that number was harder to justify as the firm grew and card volume increased.

The Solution

PaySec's team identified the core issue immediately: the firm's high volume of corporate card payments was a prime candidate for Level II interchange optimization. When merchants submit additional transaction data — including tax amount, customer code, and merchant postal code — corporate and purchasing card transactions qualify for lower interchange tiers. The difference between a standard commercial rate and an optimized Level II rate can be 0.40% to 0.90% per transaction.

PaySec set up a dedicated merchant account with Network Offset Pricing, replacing the bundled 3.1% rate with transparent interchange passthrough plus a fixed per-transaction fee. David's team could now see exactly what each card type cost at the network level and what PaySec charged on top.

The Level II data submission was configured automatically through PaySec's payment gateway. When the firm's office manager keys in a payment or sends a payment link, the gateway appends the required enhanced data fields before the transaction is submitted to the card network. No manual entry is needed — the optimization happens behind the scenes on every qualifying transaction.

PaySec also configured automated recurring billing for the firm's retainer clients. Monthly retainer charges are tokenized and processed automatically on a set schedule, eliminating the manual invoicing and payment collection that previously consumed several hours each month.

The Results

The impact was visible on the first monthly statement. PaySec's Network Offset Pricing combined with Level II data optimization reduced the firm's effective processing rate from 3.1% to approximately 1.92% — a 38% reduction in total processing costs.

Over the first 12 months, the firm saved more than $22,000 in processing fees. The largest savings came from corporate card transactions, which now consistently qualify for Level II commercial interchange tiers instead of settling at the default (and most expensive) standard commercial rate. On the firm's 70% corporate card mix, the Level II optimization alone accounted for roughly $14,000 of the annual savings.

The remaining savings came from the shift to interchange passthrough pricing. Consumer credit and debit card transactions — the other 30% of volume — were previously paying the same flat 3.1% regardless of card type. Under Network Offset Pricing, regulated debit transactions now process at their actual interchange rate (as low as 0.05% + $0.21), and consumer credit transactions process at their actual tier rather than a bundled markup.

The automated recurring billing reduced the office manager's payment collection workload by an estimated 6 hours per month. Retainer clients are billed automatically, payment confirmations are sent without manual intervention, and failed payment retries are handled by the system.