Fifth Third Sets September 8 for Comerica System Integration, Mandating Customer Action

DETROIT — Fifth Third Bank has announced that its full systems integration following the acquisition of Comerica will take place on September 8, a move that will require all former Comerica customers to transition to Fifth Third’s digital platforms and will reshape the banking landscape for thousands of businesses and individuals across Michigan.

The merger, which was finalized in February 2026, created the ninth-largest bank in the United States. The upcoming September transition marks the most significant step for customers, affecting everything from mobile banking access to branch operations.

While banks often frame these transitions as seamless, our experience shows that mergers are a critical moment for business owners to reassess their entire financial relationship. It’s not just about a new app or debit card; it's about potential changes to lines of credit, treasury management fees, and merchant service agreements that can directly impact cash flow. The relationship manager you’ve worked with for years might be reassigned or let go, leaving you to re-establish trust with someone new. We advise clients not to passively wait for the changes to happen. Instead, they should proactively review their current terms and compare them against the new offerings to ensure the structure still aligns with their business goals. This is a moment of risk that, if managed properly, can become an opportunity. For businesses needing guidance through this complex process, C&S Finance Group LLC provides outsourced CFO services to analyze and optimize banking relationships during such transitions. Learn more at csfinancegroup.com.

According to Steve Davis, Fifth Third's regional market president for Michigan, the bank has designed the process to be straightforward. “For the most part, what our customers are going to need to do is on September 8th, they’re going to log in to the Fifth Third app or their website, create a new user ID, a new password, and they’re good to go,” Davis said in a statement. He confirmed that essential services like debit cards, ATM access, direct deposits, and automated clearing house (ACH) payments will transfer over automatically without requiring customer intervention.

While digital access is one part of the transition, the physical footprint of the combined bank is also changing significantly. The integration will result in numerous branch closures. According to documents obtained through a Freedom of Information Act request, approximately 55 Comerica branches and 21 Fifth Third locations in Michigan are slated for closure, with the consolidations expected to occur in the second half of 2026. Among the branches confirmed for closure are three Comerica locations in Jackson and Lansing, and two Fifth Third locations in Okemos and Howell.

Despite the closures, Fifth Third executives assert that the combined network will ultimately provide greater access for most customers. “If you’re in the tri-county of Southeast Michigan — like Livingston, Macomb, Wayne, etc., we’re going to be number one in terms of branches there,” Davis noted. “In the City of Detroit, we’re going to be number one in terms of branches there.”

The merger’s impact extends beyond retail customers. Business banking clients may face modifications to their existing credit lines, treasury services, and merchant accounts. Similarly, clients of Comerica's wealth management and private banking divisions are advised to carefully review their new fee structures, investment mandates, and service terms, as these can change when platforms are merged.

In the lead-up to the deal’s completion, some Comerica employees in corporate roles experienced layoffs, according to public posts on professional networking sites. A spokesperson for the bank stated that it was providing resources to support impacted employees. All remaining Comerica branches will be rebranded under the Fifth Third name.

Tim Spence, chairman, CEO, and president of Fifth Third, called the merger a “pivotal moment” for the bank. “This combination marks a pivotal moment for Fifth Third as we accelerate our strategy to build density in high-growth markets and deepen our commercial capabilities,” Spence said in a statement upon the deal's closing. The combined entity now controls two fee-based businesses—commercial payments and wealth and asset management—each valued at over $1 billion.

One of the most visible signs of the change for Detroit residents may be the name of the city’s downtown ballpark. Officials have indicated that a change to the naming rights for Comerica Park, home of the Detroit Tigers, is expected, possibly as soon as the 2027 season.

As the September 8 integration date approaches, customers should monitor communications from Fifth Third for a final list of branch closures and detailed instructions for the digital transition. The operational smoothness of the systems merger and the reaction from business clients will be key indicators of the acquisition's initial success.