Maintenance reserve per mile: set it before you say yes to a load

Repair bills do not arrive by the mile. They arrive in lumps: a set of drive tires, a brake job, an injector, a turbo, an aftertreatment repair that wipes out a month of profit. That is exactly why a maintenance reserve per mile matters. It turns those lumps into a steady cost you can price into every load, so the load that causes the wear also pays for it.

This guide covers how to set the number, where public benchmarks come from, how to adjust for truck age and miles, and how to use the reserve when you judge a load. For what individual services cost by the year, see our guide to semi truck maintenance cost. This page is about the per mile number and pricing with it.

From reserve to rate

The calculator below shows how a reserve in cents per mile turns into money set aside each year and into a share of your floor rate. The values are an EXAMPLE; move them to match your truck.

The formula is simple:

Reserve per mile = expected yearly repair and maintenance spending / yearly miles (loaded and empty)

If you expect to spend $20,000 a year on repairs, service and tires and you run 100,000 miles, your reserve is 20 cents per mile. Some carriers track tires as a separate line; if you do, take them out of the reserve so they are not counted twice. Our maintenance reserve calculator walks through each part of the estimate.

Truck maintenance cost per mile benchmarks

The best known public benchmark is the American Transportation Research Institute's yearly analysis of the operational costs of trucking. Its 2026 update, covering 2025, reported an average repair and maintenance cost of about 21.5 cents per mile, up 8.6% from 2024. The report linked much of the increase to aging equipment, as carriers kept trucks longer and ran them more miles before trading.

Source: ATRI 2026 operational costs update, as reported by The Trucker, checked October 2026

The same research put the average total cost to run a truck in 2025 at about $2.34 per mile, so repairs and maintenance are a meaningful share of the whole, though well behind fuel and driver pay.

Source: ATRI 2026 operational costs update, as reported by FleetOwner, checked October 2026

Treat these numbers with care:

• They are averages across mostly larger fleets. Larger fleets often buy newer trucks, trade them earlier and get better pricing on parts and labor.
• They mostly describe tractors. A box truck, a dump truck or a tanker has a different cost pattern. Reefer units, hydraulics, tanks and trailers all add their own service.
• They lag. A yearly report describes last year. Parts and labor prices may have moved since.

A benchmark tells you whether your number is in a sensible range. It does not tell you what your truck will cost.

Adjusting for truck age and miles

The biggest factor in your reserve is the truck itself. A rough way to think about it:

• Under warranty, low miles: wear items, tires, service and aftertreatment upkeep, with major components mostly covered. The reserve can sit below the benchmark, but it should not be zero.
• Past warranty, mid miles: wear items plus the first large repairs that warranty used to cover. Reserves often climb toward or above the benchmark here.
• High miles, older truck: more frequent and more expensive repairs, a possible overhaul on the horizon, and more downtime. Reserves often run well above the benchmark.

Here is an EXAMPLE, not real carrier data. Two owners run the same lanes at 110,000 miles a year. Owner A has a three year old truck still under part of its warranty and sets 15 cents per mile, about $16,500 a year. Owner B has a nine year old truck with 800,000 miles and sets 32 cents, about $35,200 a year, because the last two years of records show big bills every few months. On the same 600 mile load, Owner B needs $102 more just to cover expected wear. If both accept the same rate, one of them is losing money without knowing it.

Duty cycle matters too. Stop-and-go local work, steep grades, rough job sites and heavy loads all add wear. Check whether your OEM spec puts your truck on a severe service schedule, and set the reserve to match.

What belongs in the reserve

Decide up front what the reserve pays for, so nothing falls through the gap between accounts. Most owners include:

• Scheduled service: oil and filters, fuel filters, coolant, grease, DPF cleaning and DEF system upkeep, per your OEM spec.
• Wear items: brakes, drums and rotors, belts, hoses, wipers, lights and batteries.
• Tires: unless you track them as a separate line.
• Unplanned repairs: the parts and labor for whatever fails between services.
• Equipment beyond the truck: reefer units, liftgates, hydraulics, tanks, trailers and tarps, where you run them.
• Inspections: the annual periodic inspection and any required tank or equipment tests.

Most owners keep tows, hotels and lost revenue from downtime out of the reserve and cover them from a separate emergency fund, because they are not wear on the truck. Whatever you choose, write it down and stick to it, so the numbers you compare from year to year mean the same thing.

Use your own records

The best estimate comes from your own history. Pull the last 12 to 24 months of repair orders, service invoices and tire purchases, add them up and divide by the miles for the same period. If you just bought the truck, ask the seller for records or use the benchmark adjusted for age until you have your own numbers.

Then compare the reserve you set with what you actually spent each quarter. If repairs keep running ahead of the money set aside, raise the reserve. If the account keeps growing well past what you expect to need, you may be able to trim it, though a healthy balance before a big repair is not a problem.

Keep the reserve as real money

A reserve on paper does not pay a shop. Many owners move the reserve into a separate account every time a load pays: miles on the load times the reserve per mile. When the brake job comes due, the money is already there, and the truck does not sit waiting for a payment to clear or end up on a high interest card.

Putting the reserve into your floor rate

A floor rate is the lowest rate per mile, counted over loaded and empty miles, that covers every cost: fuel, tires, the maintenance reserve, fixed costs such as the truck payment and insurance spread per mile, and your own pay. Any load below it loses money, even if it looks fine on the board.

The reserve is the line most often left out, because no bill arrives with the load. Put it in, and two things change. First, your floor rises to the real number. Second, the decision on each load gets easier: it clears the floor or it does not. Our page on better rates per mile shows how a floor rate is built and how counter-offers work from it.

How a dispatcher uses your reserve

When we dispatch a truck, we ask for the floor rate and how it is built, reserve included. We pass on loads that fall below it unless you tell us otherwise, and we show the trip math with empty miles counted. If a load is close to the floor, we tell you and let you decide. We never accept a load for you; the broker sends the rate confirmation directly to you to sign.

For owners just setting this up, our page for owner-operators covers how we work with single trucks, including how the fee fits in as one more line in the floor rate.