A New Tax Advantage for Banks: 25% Interest Exclusion Explained
Wisconsin’s community banks have long been a cornerstone of the state’s rural and agricultural economy. A new federal tax provision introduced under the One Big Beautiful Bill Act (H.R.1) signed into law on July 4, 2025, offers an opportunity for financial institutions engaged in rural and agricultural lending to strengthen that impact. Section 139L of the Internal Revenue Code allows qualified lenders to exclude 25% of interest income earned on eligible rural and agricultural real estate loans from federal taxable income. This measure is intended to promote increased lending activity in rural areas by providing a tax incentive to participating institutions.
Eligibility Criteria for Lenders
The definition of a “qualified lender” is intentionally broad, ensuring a wide range of financial institutions can benefit from the new tax exclusion. Eligible entities include FDIC-insured banks and savings associations, state- or federally regulated insurance companies, U.S.-based subsidiaries of bank or insurance holding companies, and certain federally chartered institutions within the Farm Credit System. This inclusive approach is particularly advantageous for Wisconsin-based lenders, many of whom already serve rural and agricultural markets and are well-positioned to take advantage of this incentive.
Loan Qualifications
To qualify for the 25% interest exclusion, a loan must be secured by real estate classified as rural or agricultural, issued by a qualified lender to a U.S. customer, and originated after July 4, 2025. The exclusion applies to interest earned during tax years ending after July 4, 2025. While the borrower does not need to be a farmer or operate an agricultural business, the collateral must meet the rural or agricultural criteria.
Specifically, “rural or agricultural real estate” includes (i) any real property substantially used for the production of one or more agricultural products, (ii) any real property substantially used in the trade or business of fishing or seafood processing, and (iii) any aquaculture facility. These definitions ensure the exclusion targets loans supporting core agricultural and rural economic activities.
It is important to note that refinanced loans are not eligible for the exclusion under the current guidelines.
Interest Expense Limitations
Section 139L modifies the application of Section 265 of the Internal Revenue Code, which traditionally disallows deductions for expenses related to tax-exempt income. Under this provision, lenders are prohibited from deducting expenses associated with the portion of interest income that is excluded from taxable income. The expense disallowance is calculated based on 25% of the tax-exempt loan’s adjusted basis.
State Tax Conformity
Wisconsin already provides a state-level exemption for certain commercial and agricultural loan income; that exemption remains unchanged by the new federal Section 139L provision. Although both aim to encourage lending in key sectors, they operate independently. Wisconsin does not automatically conform to federal tax law, and its treatment of loan income will stay the same unless the state legislature takes specific action to adopt the new federal provision. Financial institutions should continue to track and report federal and state tax benefits separately.
Implications for Financial Reporting
It is equally important to consider how these changes affect financial reporting. The exclusion of a portion of interest income under this provision introduces specific considerations for both C corporations and S corporations.
- C Corporations
For C corporations, the 25% interest exclusion reduces taxable income, thereby lowering the current tax expense reported on the income statement through the tax provision calculation. Because this exclusion represents a permanent book-to-tax difference rather than a temporary timing difference, it does not give rise to a deferred tax liability.
- S Corporations
For S corporations that are treated as pass-through entities, the exclusion reduces the taxable income reported on shareholders’ Schedule K-1s. The deduction may influence the calculation of distributable income and affect shareholder basis.
Strategic Considerations
Financial institutions are encouraged to review their loan portfolios and origination strategies to identify opportunities to benefit from the Section 139L interest exclusion. Given Wisconsin’s strong agricultural presence and extensive rural lending activity, this provision may offer both tax savings and strategic advantages. Institutions should consult with their trusted tax advisors to explore planning opportunities and accurate financial reporting.
