Monzo, the British digital bank, has told former U.S. customers that any 2026 interest tax form will go to the mailing address it has on file, and that address changes must reach the company by December 31, 2026. All Monzo U.S. accounts were closed as of June 8, 2026, and the company now relies on the mailing and email addresses it holds for each former customer.
Monzo says on its U.S. closure page that it is stepping back from the United States to focus on the United Kingdom and Europe. It adds that it may return and would announce that if it does.
The question for former customers is what has to be done, and by when. Anyone who earned interest on a Monzo account in 2026 and has moved since opening it should email [email protected] with the new mailing address or contact details before December 31, 2026. The tax form will be mailed to the address on file, so a stale address means the form goes to the wrong place.
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Who will get a 2026 interest tax form?
Monzo says a customer who earned $10 or more in interest in the 2026 tax year will get a Form 1099-INT, the form banks use to report interest income to account holders and the IRS. The company says it will mail the form to the address on file by the standard 2027 tax deadline.
Customers who earned less than $10 in interest are not covered by that promise.
The form travels by mail, while the leftover-balance checks traveled by email. That makes the mailing address and the email address two separate details for a former customer to keep current, and Monzo’s December 31 date applies to both mailing address and contact details.
How did leftover balances reach customers?
When Monzo closed the accounts, balances went to a linked bank account, with accrued interest, wherever one was available. Where there was no linked account, Monzo says it sent a check for any balance over $1.00 to the email address on file.
Those checks were delivered through Checkbook.io, a payments partner, so the sender name in the inbox may read “Checkbook.io” rather than Monzo. For joint accounts, the check was made out to both account holders and sent to one holder’s email address.
The threshold matters. Monzo’s page describes checks for balances over $1.00, so a closed account holding a dollar or less is not covered by that description. Customers who had a linked bank account did not need a check at all, because Monzo sent those funds, including any accrued interest, straight to the linked account.
What if the emailed check never showed up?
Monzo’s advice is to look in the spam or junk folders first, since a message from an unfamiliar sender name can land there. A customer who still cannot find it, or who received the email but cannot open or deposit the check, can write to [email protected].
The same address handles requests for account statements and reports of transactions the customer does not recognize. Monzo also says any new deposit or transfer sent to a closed account is automatically rejected and returned to the sender, so anyone still paying into an old Monzo account, such as an employer or a family member, needs to use a different bank account.
What is still unclear for former customers?
Monzo has not said how many U.S. customers were sent emailed checks or how many are still uncashed. Its closure page sets December 31, 2026, as the date for address and contact updates, and says nothing about a later date for requesting a replacement form. Former customers who think the address on file is out of date have until the end of December to correct it, and the only route Monzo lists is an email to [email protected].
Expecting a Monzo tax form in the mail?
A 1099-INT that never arrives is an easy thing to miss, and interest income that is left off a return can bring an IRS letter months later. Monzo’s closure page sets one date for the address fix: December 31, 2026.
The IRS Refund Recovery Kit does not cover Monzo or its forms. It covers what comes after tax paperwork reaches the IRS: a notice decoder for reading IRS letters, and a refund status tracker spreadsheet for following a refund that is late. It also includes the refund-trace steps and the three-year refund deadline.
Get the notice decoder and refund tracker in the IRS Refund Recovery Kit →
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This article was produced with AI assistance and edited for accuracy against the sources linked above.
