Mississippi Mileage Deduction 2026: 0% on the First $10,000

Mississippi is not a flat-tax state, whatever the headlines say. The Department of Revenue rate schedule taxes the first $10,000 of taxable income at 0% and only the excess at 4%. That distinction matters to a self-employed driver, because your mileage deduction comes off the top of the taxable income that sits above the $10,000 line, where the 4% actually bites.

Source: Mississippi Department of Revenue, General Information, which states plainly that "Mississippi has a graduated tax rate" and lists 0% on the first $10,000 with 4% on the excess for tax year 2026. Verified August 2026.

What the deduction is worth in Mississippi

At 15,000 business miles you deduct $11,138 at the 76¢ rate in effect from July 1, 2026. Against Mississippi's 4% bracket that is roughly $446 off your state bill, on top of about $4,154 in federal income and self-employment tax. Call it $4,600 for keeping a log. The federal figure assumes a 22% marginal income tax bracket plus 15.3% self-employment tax and no qualified business income deduction. Your own number moves with your bracket.

The rate is on a scheduled decline

Mississippi legislated a step-down that is already visible in the DOR schedule: the rate above $10,000 was 4.4% for tax year 2025, is 4% for 2026, and drops to 3.75% for 2027. Revenue-trigger provisions carry the reduction further toward elimination after that. The practical consequence for a driver is counterintuitive: because the state rate is falling, a mile logged this year shelters income at a higher rate than the same mile will next year.

That is an argument for tightening your log discipline now rather than later. The federal side of the deduction is not going anywhere, but the Mississippi side shrinks a little every year.

How to File

Deduct your business miles on federal Schedule C, Line 9 at 76¢ (the rate from 1 July 2026; 72.5¢ before that)/mile. Mississippi starts from your federal adjusted gross income, so the deduction flows to your state return without a separate entry. If you expect to owe more than $200 in Mississippi tax, make quarterly estimated payments.

FAQ

Is Mississippi a flat tax state?

No. The Department of Revenue describes the structure as graduated. There are two tiers: 0% on the first $10,000 of taxable income and 4% above it for tax year 2026. A single 4% rate applied to every dollar would overstate what most filers owe.

Does Mississippi require mileage reimbursement?

No. Mississippi has no state law requiring private employers to reimburse mileage.

Can W-2 employees deduct mileage in Mississippi?

No. The mileage deduction for W-2 employees was permanently eliminated under the One Big Beautiful Bill. If your employer does not reimburse, you have no tax remedy.

Track every business mile. Start free with TruMile →

Related guides