What Happens to Your Bookkeeping When Your Bank Is Acquired

When your bank is acquired, four things break in your books: the accounting software bank feed stops importing, account and routing numbers may change, the statement archive migrates to the acquirer's platform on their schedule, and any reconnected feed imports forward only without backfilling the gap. The single most useful thing you can do is download every statement PDF you can currently reach, before the conversion, and keep them.

This is live right now for a lot of US businesses. Fifth Third Bancorp closed its acquisition of Comerica on February 1, 2026, an all-stock deal in which each Comerica share converted into 1.8663 Fifth Third shares, producing a combined bank with roughly $294 billion in assets. BMO's move to a new digital banking platform after the Bank of the West acquisition caused the same pattern. The pattern repeats at every merger of any size.

Why the bank feed stops

An accounting software connection is bound to an institution record at the aggregator, not to your account in the abstract. When two banks combine, the acquiring bank's platform takes over, credentials move, and the old institution record eventually stops serving data. The connection does not fail loudly. It just stops bringing in transactions.

People typically notice in month three. By then two months of transactions are missing, the bank rec has not been done since the conversion, and the fix involves both re-authorizing a connection and sourcing the gap from somewhere else.

A reconnected feed does not backfill

This is the part that surprises people. Once you remove the broken connection and authorize a new one, the feed begins importing from that day forward. It does not reach back and collect the weeks it missed. Some connections offer a limited lookback of 30 to 90 days, and even that is not guaranteed to cover the conversion window.

So the gap has to be filled manually, from documents. That means either typing the transactions in, or converting the statement PDFs for the affected months and importing them. For anything longer than a couple of weeks, converting is the only reasonable option.

What to download before a conversion

If you know a conversion is coming, spend twenty minutes on this. It is cheap insurance and it is the only part of the process you fully control.

• Every statement PDF the archive holds. Not the last three months. All of them. Large banks commonly keep about seven years online, and there is no guarantee the full archive migrates or that it stays reachable at the same depth on the new platform.
• A transaction export covering the current period. The download window is short, so grab what exists now rather than assuming you can pull it later.
• Anything unusual. Analysis statements, wire confirmations, returned item notices, year-end interest documents. These often live in a different area of online banking than the statements and are the first things to get lost.
• Records for closed accounts. An account you closed last year is exactly the one that becomes impossible to retrieve after the platform changes.

Store them somewhere that is not the bank. A statement PDF you have saved is the one record a conversion cannot touch.

What changes on the statement itself

Branding changes first, usually before anything technical does. You will get statements under the old bank's name, then a transitional period, then the acquirer's format. Statement layouts differ between banks, so a parsing rule or a spreadsheet template built around the old format tends to break at exactly the moment the letterhead changes.

Account numbers sometimes change too, particularly when both banks used overlapping number ranges. When they do, your chart of accounts and any saved bank rules need updating, and your prior year records now sit under a different number than your current ones. Note the mapping somewhere durable while you still remember it, because in eighteen months nobody will.

Closing the gap afterward

The recovery sequence is the same every time.

First, establish exactly where the feed stopped. Find the last imported transaction date in your accounting software, per account, and write it down.

Second, collect the statement PDFs covering everything from that date to today. Whole months are easier to work with than partial periods, so start from the beginning of the month in which the feed stopped.

Third, convert those statements to a spreadsheet or an import file. Our Comerica bank statement to Excel converter covers the current case, and the general bank statement PDF to Excel converter handles any other institution with the same output layout. Convert several months in one upload and they come back as one continuous sheet in date order.

Fourth, import and de-duplicate. This is where care pays off. If a partial month did import before the feed died, importing the whole month again creates duplicates. Match on date and amount, and trim the import file to start the day after the last imported transaction. If your accounting software takes a Web Connect file, converting the statement to a QuickBooks-ready bank file avoids the CSV column mapping step entirely.

Fifth, reconcile each affected month against the statement closing balance before you move on. A conversion gap is the most common source of a bank rec that has been out of balance for a year, and the cheapest time to fix it is now, one month at a time.

Why statements beat feeds for anything that matters

Bank feeds are convenient and they are fine for day to day coding. They are not a record. They depend on a connection somebody else controls, they change coverage without notice, and they cannot be produced to an auditor or a lender as evidence.

The statement is the document the bank stands behind. It carries a beginning balance, every posted transaction and a closing balance, which is what makes reconciliation provable rather than assumed. That is why lenders ask for statements rather than exports, and why the IRS does the same. Our guide on how far back you can get bank statements covers retrieval, including from closed accounts, and reconciling bank statements covers the tie-out.

Common questions

Will my bank feed definitely break when my bank is acquired?

Not always, but plan as if it will. Connections tied to the acquired bank's institution record commonly stop during a systems conversion and have to be removed and re-authorized. Small conversions sometimes pass through cleanly. Larger ones rarely do for every customer.

How long does a bank conversion take?

The legal close and the systems conversion are different events, often months apart. Fifth Third closed the Comerica deal on February 1, 2026, while customer-facing platform changes follow on a separate timetable communicated by the bank. Watch for the conversion notice, not the merger announcement.

Do my old statements disappear after a merger?

Not necessarily, but the depth of archive available on the new platform is set by the acquirer and is often shallower than what the acquired bank offered. Download what you need while the old archive is still reachable. Requesting old statements later usually takes days and can carry a per-statement fee.

Can I still convert statements issued under the old bank's name?

Yes. Converting a statement reads the document rather than connecting to an account, so branding, account status and whether the institution still exists are all irrelevant. A statement from a closed account at a bank that has been absorbed converts the same as a current one.