Owner-Operator Quarterly Taxes: What You Owe and When (2026)
Self-employment tax, federal income, state, and how the OTR per-diem deduction works. Walkthrough of Form 1040-ES and how to stop the underpayment penalty.
Why owner-operators have to pay quarterly
Settlement checks from brokers come with zero tax withholding. The IRS expects you to send in your own estimated taxes four times a year. Skip them, owe more than $1,000 at year-end, and you get hit with an underpayment penalty (currently about 8% APR on the shortfall).
The three taxes you owe
- Self-employment tax — 15.3% of net earnings (12.4% Social Security + 2.9% Medicare). This is the big one most new owner-ops underestimate.
- Federal income tax — graduated brackets (10% to 37%) on net income after deductions.
- State income tax — varies, 0% (TX, FL, TN, NV, WA) to 10%+ (CA, NY, NJ).
The per-diem deduction is huge
The IRS lets transportation workers subject to DOT hours-of-service deduct $80 per full day on the road in 2026 ($60 partial days). The deduction is 80% deductible for transportation workers (not the standard 50%).
240 OTR days × $80 × 80% = $15,360 deduction. That alone saves about $4,500 in combined tax at typical rates.
Quarterly due dates
- April 15 — Q1 (Jan–Mar income)
- June 15 — Q2 (Apr–May income, yes only 2 months)
- September 15 — Q3 (Jun–Aug income)
- January 15 (next year) — Q4 (Sep–Dec income)
How to actually pay
Three options:
- EFTPS — free, ACH from your bank account. Sign up takes a week.
- IRS.gov/payments — instant, free for ACH, ~2% fee for credit card.
- Mail a check with a 1040-ES voucher. Don't. People lose checks.
Safe-harbor rule
Pay at least 100% of last year's total tax (110% if last year's AGI was over $150K), spread across the four quarters, and you avoid the underpayment penalty regardless of how this year shakes out. This is the easiest way to stay safe.
Deductions to remember
- Fuel, maintenance, insurance, truck payment interest, depreciation
- ELD subscription, GPS, dispatch software
- Per diem (above)
- Cell phone (business portion)
- Tax prep fees, factoring fees, bank fees on business account
- Trucking-specific tools, work boots, work gloves
- Health insurance premiums (above-the-line deduction)
- SEP-IRA or Solo 401(k) contributions (up to ~$70K in 2026)
When to get a CPA
If you gross $150K+ or run multiple trucks, a trucking-specific CPA pays for themselves through depreciation strategy, retirement-plan setup, and entity structure (S-corp vs. sole prop). Expect $1,500–$3,500/year for full bookkeeping + tax filing.