Unexplained line item in April Sales Tax Report (specifically, "Mo")

yesplasticfree — Tue, 02 Jun 2026 21:50:29 GMT

I'm hoping someone here has seen this before.

When I pull my April 2026 sales tax report, I see three line items under Tax Name: MA, Massachusetts, and Mo. I've been able to account for the first two — MA is in-person sales tax collected at the register, and Massachusetts is the automatic destination-based tax on online orders via Square's Tax Enrollment. But I cannot figure out where Mo is coming from.

Here's what I've already ruled out:

I have no Missouri transactions in April. I've exported my full April transactions CSV and checked every row.
I have only one manually configured tax (MA, 6.25%). There is no "Mo" tax in my Sales Taxes settings.
My Tax Enrollment shows Massachusetts only.

I contacted Square support today and was transferred six times without a resolution. One agent suggested it was Missouri destination-based tax on a shipped order, but I don't ship to Missouri and the transaction data confirms this.

Has anyone seen a "Mo" line item before? Any idea what generates it or how to make sense of it for tax filing purposes?

thread Unexplained line item in April Sales Tax Report (specifically, "Mo") in Reports Setup & Management

Unexplained line item in April Sales Tax Report (specifically, "Mo")