With the final quarter of 2026 approaching, taxpayers should review the significant inflation adjustments to the standard deduction and the mid-year increase to the business mileage rate to optimize their year-end tax position.
Significant Increases to 2026 Standard Deductions
For the 2026 tax year, the Internal Revenue Service has implemented substantial increases to the standard deduction amounts following annual inflation adjustments. Taxpayers filing as married couples filing jointly will see their standard deduction rise to $32,200, an increase of $2,200 from the prior year. Single taxpayers and married individuals filing separately will have a standard deduction of $16,100, while heads of households will see an increase to $24,150. These adjustments are intended to prevent 'bracket creep' and ensure that inflationary gains do not inadvertently increase a taxpayer's effective tax rate.
Mid-Year Business Mileage Rate Boost
Effective July 1, 2026, the IRS increased the standard business mileage rate to 76 cents per mile for the remainder of the year. This represents an increase from the 72.5 cents per mile rate that was in effect for the first half of 2026 (January 1 through June 30). Business owners and self-employed individuals should ensure their mileage logs distinguish between travel occurring before and after the July 1 cutoff to accurately claim the higher rate for the second half of the year. Medical and moving mileage rates also saw an adjustment to 73.5 cents per mile starting July 1.
2026 Marginal Tax Brackets and Thresholds
The marginal tax rates for 2026 remain at 10%, 12%, 22%, 24%, 32%, 35%, and 37%. However, the income thresholds for these brackets have been adjusted for inflation. For instance, the top 37% rate now applies to single individuals with taxable income exceeding $640,600 and married couples filing jointly with income exceeding $768,700. Additionally, the Alternative Minimum Tax (AMT) exemption has been increased to $90,100 for unmarried individuals and $140,200 for married couples filing jointly.
IRS Security and Scam Alerts
In recent September 2026 updates, the IRS and the Security Summit partners issued warnings regarding identity theft and sophisticated tax credit scams. Taxpayers are cautioned to remain vigilant against promoters selling fraudulent 'Tribal Tax Credits.' The IRS emphasizes that maintaining data security and verifying the legitimacy of tax-related communications are essential components of year-end planning.
Primary sources and further reading
- IRS announces 2026 tax year annual inflation adjustments (IR-2025-103)
- Revenue Procedure 2025-32
- IRS issues mid-year mileage rate adjustment (IR-2026-98)
- IRS News Release: Security Summit and Scam Warnings (IR-2026-112)
Tax rules depend on the tax year and individual circumstances. Confirm the current IRS guidance before filing.