How do I calculate cost per mile for my trucking company?

A bad accident is not what kills a growing carrier. Neither is a tough freight market. Bad math is. Specifically, they don't know their real cost per mile. They run blind on rate boards and gut feeling while the numbers underneath the business quietly bleed them out.

The carriers who build something durable run the numbers every single month. They know exactly what it costs to move a mile, and they never haul freight below that line.

Cost Per Mile: The Monthly Ritual

The American Transportation Research Institute (ATRI) surveys carriers every year. In its 2026 update, covering 2025, the average cost to run a truck was $2.336 per mile, fuel included. That is the highest in the report's history. Without fuel, the average was $1.854 per mile.

Read that number for what it is: an industry average from a survey of carriers. It is not your number. It already includes driver wages and benefits, so if you drive your own truck, part of that $2.336 is your own pay. Use it as a check on your math, never as a substitute for it.

Here is the exercise. Every month, sit down with your actual numbers. Add up your costs (fuel, insurance, truck payment, maintenance, permits, driver pay if you have employees) and divide the total by miles driven. That is your cost per mile. If your loaded rate is below it, you are subsidizing shippers. You are paying them to move their freight.

The formula is not complicated:

• Fuel: gallons used multiplied by your average diesel price for the month
• Insurance: your monthly installment
• Truck payment, or your depreciation figure if you own outright
• Driver pay, if you are not driving yourself
• Maintenance and repairs for the month
• Tolls, permits and miscellaneous fees

On fuel: the US on-highway diesel average was $6.352 per gallon for the week of October 26, 2026, according to the Energy Information Administration (EIA). At 6 miles per gallon and 10,000 miles in a month, that is about $10,587 in fuel alone. Diesel moves every week, so check the current figure at eia.gov. Add your other line items. Write the number down. That is your floor.

Most new carriers price freight by whatever the load board shows. The ones who survive price freight by their cost per mile first, then filter the load board for anything that clears it. The load board is a menu. Your cost per mile tells you which items you can afford to order.

Cash Reserves: The Number Nobody Talks About

New carriers spend every dollar they make. The ones who survive keep 60 to 90 days of operating expenses in a reserve account before they add a single truck. That is my rule, and I have not seen a better one.

The reasoning is not abstract. Freight markets drop without warning and stay down for months. Insurance renews every 12 months whether the market cooperated or not. A single breakdown can sideline a truck for weeks. Your largest shipper can pause volumes on short notice with no obligation to explain why. A carrier running one month of reserves does not survive a 45-day soft patch. A carrier running 90 days of reserves does.

The reserve account is not interesting. It earns a little interest. You never touch it outside a genuine emergency. It is not a down payment fund for the next truck. It is not working capital. It is the right to stay in business when the market turns against you, and at some point it will.

Open the account today if you do not have one. Start with whatever you have. Automate a monthly transfer. Build it to 90 days. Then think about the next truck.

Taxes Done Right

Trucking taxes are not complicated. But they punish every carrier who treats them as someone else's problem.

A common rule of thumb is to set aside 25 to 30 percent of every net dollar for taxes before you spend anything. Your accountant sets the real number for your situation. Quarterly estimated payments are due to the IRS on April 15, June 15, September 15 and January 15 (the next business day if one falls on a weekend or holiday). Miss one and you owe the tax plus a penalty on the unpaid amount.

An accountant who works specifically with trucking businesses will usually earn their fee back. Section 179 (the 2026 limit is $2,560,000, adjusted for inflation each year) and 100 percent bonus depreciation, which Congress restored in 2025, can let you deduct equipment in the year it goes into service instead of spreading it over several years. On a $60,000 truck, that is a big deduction in year one. Whether taking it all at once is smart for you is exactly the question to ask that accountant.

Track your mileage, fuel receipts and maintenance costs every month without exception. These are deductions. An owner-operator who cannot produce receipts at tax time is leaving real money on the table and handing an auditor an easy win.

Do not use a general CPA who has never seen a trucking return. The depreciation schedules, fuel tax credits and per diem rules in this industry are specific. Find someone who knows them.

When to Add a Truck, and What It Does to Your Insurance

This is the question every growing carrier gets wrong.

Below your cost per mile, you're not hauling freight. You're funding shippers.

The honest answer: add a truck when you have 60 to 90 days of reserves sitting on top of the down payment, a driver hired and background-screened, and freight lined up at or above your cost per mile. Not before. All three, at the same time.

Here is what adding a truck does to your insurance. Your premium goes up immediately, usually in proportion and sometimes more. A one-truck carrier going to two trucks does not simply double the liability premium. The underwriter reassesses the fleet as a whole. If your second driver has a worse MVR than your first, the rate on both trucks can rise. The new hire's record follows the whole fleet.

Rapid growth creates its own problem. Going from one truck to three or four in a single policy year tells an underwriter your operation may be growing faster than your management can handle. Some markets we quote decline on fleet growth. Others write it at a price that eats your margin.

The rule is simple: grow with intention. One truck. Clean record for 12 months. Build your CSA profile, your telematics history and your reserve. Then add the second unit. The time it takes to do this right is the same time it takes to fail if you skip it.

Lease vs. Own in 2027

I am not going to print a truck price in a book you will read all year. Used and new truck prices move month to month. Get written quotes from at least two dealers and your lender before you decide anything.

One date matters. EPA's 2027 heavy-duty engine emissions standard still starts with model year 2027 engines. In July 2026 EPA proposed changes to how manufacturers comply, and the final rule was still pending when this edition went to print. How much any of this moves truck prices is not settled. If you are weighing a truck with a pre-2027 engine at today's price against waiting, get both prices in writing and do the math.

Lease versus own is a capital question, not a preference question. Leasing preserves cash and keeps your monthly obligation predictable, but you build no equity and own nothing at the end of the term. Owning takes a bigger upfront commitment but gives you an asset you can sell, refinance or use as collateral.

Do the down payment math before you shop. If a lender asks for 20 percent down on a $60,000 truck, that is $12,000. Then add the insurance down payment. On financed or installment policies we see, that is commonly 20 to 25 percent of the annual premium, and for a new authority the annual premium is the highest it will ever be. Get the insurance quote before the truck, so the full number is on paper.

Lease-to-own structures exist. Read every clause before you sign. Mileage caps, maintenance obligations and buyout terms vary widely. Some arrangements favor the lessor in every scenario. Have an attorney review it before you commit. The legal fee is cheap insurance against a multi-year trap.

Market Cycles: The Cautionary Arc

In 2021, the pandemic freight boom hit. Spot rates spiked. New authorities flooded the market. Owner-operators who had never turned a profit in trucking were making money. It seemed like it would not stop.

Then it stopped.

From 2022 through 2024, a long freight recession pushed a lot of carriers out. Spot rates collapsed. The carriers who survived were running dedicated lanes on contracted rates, holding 60 to 90 days of reserves, and keeping overhead low enough to ride out a long stretch of thin margins. The ones who entered in 2021 thinking those rates were normal did not survive the correction.

Here is where things stood going into 2027. In September 2026, DAT put the national van contract rate at $2.40 per mile before fuel and the spot rate at $2.17. With fuel, contract was $3.24 and spot was $3.01, which was up 96 cents from a year earlier, in a month when diesel passed $6 a gallon. Spot is still running below contract.

On the supply side, capacity has been squeezed by rules. English-language-proficiency violations have been out-of-service offenses since June 25, 2025. FMCSA's non-domiciled CDL rule took effect March 16, 2026. FMCSA's Motus registration system, live since May 19, 2026, makes new applicants verify their identity. All of that is a tailwind for compliant, established carriers. But higher rates driven by fuel are not profit, and markets cycle.

The carriers starting in 2027 who assume current rates are the floor will make the same mistake the 2021 class made. The discipline is identical at every point in the cycle: know your cost per mile, hold your rate, keep your reserves, and do not grow faster than your management can handle.

Diversification Without Dilution

One lane, one shipper, one commodity: that is a fragile business. When the shipper pauses volumes, when the lane gets rate-shopped into the floor, when the commodity hits a seasonal trough, you have nothing to fall back on.

Spread your shippers so that no single account controls more than 40 percent of your revenue. Spread your lanes so you have room to move when one corridor softens. An east-west primary lane with a north-south secondary gives you somewhere to go when the primary stalls. Spread your commodities too, if your equipment allows it.

What you should not do is mistake dilution for diversification. A dry-van carrier adding hazmat loads without the endorsements, training and the right insurance is not diversifying. It is adding a compliance burden it is not equipped to manage, and federal liability minimums for hazmat start at $1 million, not $750,000. A carrier adding temperature-sensitive freight without refrigerated equipment or reefer breakdown coverage on its cargo policy is taking on liability it cannot price or defend.

Diversification means spreading your revenue across more of the kind of business you already know how to do safely. It does not mean chasing a higher rate in a freight category that needs a different operation.