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Income Taxes
 9 Months Ended
Sep. 30, 2025
Income Tax Disclosure [Abstract]  
Income Taxes
Note 6. Income Taxes

ASC 740, Income Taxes, defines the threshold for recognizing the benefits of tax return positions in the financial statements as "more-likely-than-not" to be sustained by the taxing authority. This section also provides guidance on the derecognition, measurement and classification of income tax uncertainties, along with any related interest and penalties, and includes guidance concerning accounting for income tax uncertainties in interim periods.

The unrecognized tax benefit related to uncertain tax positions related to state income tax filings was $6.4 million and $10.1 million at September 30, 2025 and December 31, 2024, respectively. During the three months ended September 30, 2025, Pinnacle Financial paid no taxes related to state income tax filings for tax years prior to 2025. During the nine months ended September 30, 2025, Pinnacle Financial paid $3.7 million of taxes related to state income tax filings for tax years prior to 2025. During the three and nine months ended September 30, 2024, Pinnacle Financial paid $55,000 and $365,000, respectively, of taxes related to state income tax filings for tax years prior to 2024.

Pinnacle Financial's policy is to recognize interest and/or penalties related to income tax matters in income tax expense. No interest and penalties were recognized during the three and nine months ended September 30, 2025 and September 30, 2024.

Pinnacle Financial's effective tax rate for the three and nine months ended September 30, 2025 was 17.4% and 17.8%, respectively, compared to 19.0% and 18.5%, respectively, for the three and nine months ended September 30, 2024. The difference between the effective tax rate and the federal and state income tax statutory rate of 25.00% at September 30, 2025 and 2024, respectively, is primarily due to investments in bank qualified municipal securities, tax benefits of Pinnacle Bank's real estate investment trust and municipal investment subsidiaries, participation in the Tennessee Community Investment Tax Credit program, and tax benefits associated with share-based compensation and bank-owned life insurance, offset in part by the limitation on deductibility of meals and entertainment expense, non-deductible FDIC premiums and non-deductible executive compensation.

Income tax expense is also impacted by the vesting of equity-based awards, with expense or benefit recorded as a discrete item as a component of total income tax, the amount of which is dependent upon the change in the grant date fair value and the vest date fair value of the underlying award. For the three and nine months ended September 30, 2025 and 2024, Pinnacle Financial recognized excess tax benefits of $245,000 and $4.0 million, respectively, compared to $131,000 and $2.6 million, respectively, with respect to the vesting of equity-based awards.

On July 4, 2025, H.R. 1, a bill to provide for reconciliation pursuant to title II of H. Con. Res. 14, informally known as the “One Big Beautiful Bill Act” (OBBBA), was signed into law, which includes a broad range of tax reform provisions that may affect Pinnacle Financial's financial results. Pinnacle Financial is currently evaluating the impact of the OBBBA which could affect Pinnacle Financial's effective tax rate and deferred tax assets in 2025 and future periods. A quantitative estimate of the specific financial effects cannot be reasonably determined at this time due to the complexity of the changes in the OBBBA. The impact of the tax provisions in the OBBBA will depend on facts in each year and anticipated guidance from the U.S. Department of the Treasury.