In the Appeal of Mather, the California Office of Tax Appeals (OTA) held in a precedential opinion that New York City’s (NYC) Unincorporated Business Tax (UBT) was not a tax “imposed by and paid to another state,” as required to claim the Other State Tax Credit (OSTC), because New York State (NYS) did not require NYC to impose the UBT. The OTA also held that the NYS Metropolitan Commuter Transportation Mobility Tax (MCTMT) met the requirements to claim the OSTC, but that the taxpayers failed to substantiate the amount of their claim.

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The May Revision of California’s 2024-2025 state budget seeks to block refund claims, worth approximately $1.3 billion for historical tax years, and $200 million per year going forward, by codifying informal guidance recently rejected by the Office of Tax Appeal’s (OTA) decision in the 

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