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    • California—Corporate Income Tax: Apportionment Regulation Updated
    • California—Multiple Taxes: Low Income Housing Credit Provisions Amended
    • California—Sales and Use Tax: Limited Tax Exclusion for Pawnbrokers Extended Through December 31, 2031
    • District of Columbia—Multiple Taxes: Sales Tax Increase Delayed, Decoupling Provision Readopted
    • Idaho—Multiple Taxes: Interest Rate on Tax Delinquencies and Refunds Set for 2027
    • Massachusetts—Motor Fuel Tax: Two Month Suspension For Gas And Diesel Tax Proposed
    • New Mexico—Tobacco Tax, Practice and Procedure: Rules Regarding New Regulations, Cigarette Taxes Amended
    • Oklahoma—Personal Income Tax: Electronic Filing Guide for Software Developers Issued
    • Oklahoma—Personal Income Tax: Electronic Filing Handbook Issued
    • Rhode Island—Sales and Use Tax: Report Generated through AI and Human Review was Taxable
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    State Tax Day - Current, S.5, Idaho—Multiple Taxes: Interest Rate on Tax Delinquencies and Refunds Set for 2027, (Sep 24, 2026)

    The interest rate on overpayments and underpayments of Idaho taxes for 2027 is 6% per year.

    Interest Rates, Idaho State Tax Commission, September 2026

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