A flat vehicle allowance is generally taxable pay. A company truck or a substantiated mileage reimbursement mostly is not. On a high-mileage field seat, that difference can outweigh a $5,000 gap in base salary. Write the truck, per diem, fuel and phone lines as carefully as the salary, because the candidate will price every one of them.
Suppose a superintendent in Houston is holding two offers. One pays $150,000 with a $1,000 monthly vehicle allowance. The other pays $145,000 with a company truck and a fuel card. The first is $5,000 better on base and $17,000 better on paper. In the driveway it is $12,500 worse, and the contractor who wrote it will never be told why the answer was no.
How is a construction vehicle allowance taxed?
A flat construction vehicle allowance paid through payroll with no mileage log is generally treated as wages, so income tax and payroll tax apply. Reimbursement under what the IRS calls an accountable plan, where business miles are substantiated, generally is not wages. Your CPA should confirm which one your plan is.
The line between the two is drawn by three tests in IRS Publication 463: the expense has a business connection, the employee accounts for it within a reasonable period, and any excess is returned. Miss one and the arrangement is a non-accountable plan. The whole payment then lands on the W-2 and goes through withholding like any other wage, under the employer rules in Publication 15.
A company truck sits on the other side of the ledger. Business use is not income to the employee. Personal use, which generally includes the commute, is a taxable fringe benefit, and Publication 15-B sets out the methods for valuing it. Some specially equipped work trucks are treated more favorably. Which rule fits a given three-quarter-ton pickup is a question for the CPA, not for the hiring manager, and state tax treatment varies on top of the federal position.
| Offer line | How it is usually paid | General federal treatment | What the candidate hears |
|---|---|---|---|
| Flat vehicle allowance | Fixed monthly amount through payroll | Generally wages | A taxed raise that has to buy a truck |
| Mileage reimbursement | Per logged business mile | Generally not wages at or under the IRS standard rate | Fair, if logging is painless |
| Company truck | Employer owns, insures, fuels | Personal use is a taxable fringe | One less vehicle to own |
| Per diem | Daily rate while away from home | Not wages if substantiated, within the federal rate, on a temporary assignment | Whether the remote job costs the family money |
| Fuel card | Card on the employer’s account | Personal fuel is generally a fringe | A rule that needs stating once |
The tax position is half the story. The other half is what the truck costs to run, and that is where two offers come apart.
Company truck or vehicle allowance: which costs the candidate less?
On a high-mileage field seat the company truck usually costs the candidate less, because the employer carries depreciation, fuel, insurance and tires. A vehicle allowance wins only when the miles are low or the allowance is large enough to cover the truck after tax.
Run the Houston offers as a worked example. Every figure below is an assumption, chosen to show the arithmetic.
Offer A pays $1,000 a month, so $12,000 a year, flat through payroll. Assume a combined marginal rate of 30 percent across income and payroll tax, and the superintendent keeps $8,400. He drives 28,000 miles a year between the office, two jobs and home. Assume his own truck costs 80 cents a mile all in, and the year costs $22,400. The vehicle line leaves him $14,000 out of pocket.
Offer B puts the truck, fuel, insurance and maintenance on the contractor. Personal use is still taxable. Assume payroll adds $5,000 of imputed income for it, and at the same 30 percent the cost to him is $1,500.
So the vehicle lines are $12,500 apart, in favor of the offer with the lower salary. The $5,000 of extra base on Offer A is worth $3,500 after the same tax rate. Offer B, the one that looked $17,000 light on paper, puts him $9,000 ahead.
Change the assumptions and the gap moves. A project executive who drives 9,000 miles a year in a sedan will prefer the allowance. That is the point: the right line depends on the seat, and a contractor paying every salaried role the same $1,000 is overpaying the estimator and underpaying the superintendent.
Candidates say they want base. What they compare is what is left once the truck is paid for, and the two are different numbers. Regional pay data makes it sharper: BLS publishes metro wage data for construction managers across the United States, and base moves a good deal from one metro to the next. A set of tires costs about the same everywhere. The lower the base in your market, the more of the decision the vehicle line carries. Our pieces on superintendent pay and project manager pay cover the salary side.
When does per diem on a remote job become taxable pay?
Generally when it is paid without substantiation, to the extent it exceeds the federal rate for the location, or when the assignment stops being temporary. The IRS treats an assignment realistically expected to last more than one year as indefinite, and per diem on an indefinite assignment is generally wages.
That last test catches contractors out. Take a Nashville builder sending a project manager to a hospital job three hours away on a 14-month schedule. Under the general rule in Publication 463, the assignment was indefinite from the day 14 months was the realistic expectation, not from month 13. The schedule answered the tax question before payroll was asked.
The federal government publishes per diem rates by location, split between lodging and meals. Staying at or under them, with dates and location documented, is what keeps the payment simple.
A candidate with a family reads three things in this line: the daily rate, whether weekends count, and how often the company pays the trip home. The third usually matters more than the first. A per diem policy nobody can explain in the interview will be explained to the candidate later, by a competitor. The staffing side of the same decision is covered in remote project staffing.
Why are allowances excluded from a search fee base?
An allowance offsets a cost of doing the job, and a fee base should measure what the seat pays. Selah Talent Partners calculates its fee on first-year cash compensation: base salary, any contractual or target bonus stated in the offer letter, and any signing bonus. Allowances and benefits are excluded.
Discretionary bonus, commission and equity are excluded as well, and the base is named in the agreement so nobody argues about it at invoice time.
A contractor could read the exclusion as a reason to move salary into the allowance line. It is a poor trade. A flat allowance is taxed like salary anyway, while the bonus percentage, the retirement match and the next raise all key off base. The candidate knows that, and so will the next employer who asks what the base was.
Write the non-salary lines before the candidate asks
An offer letter that says “vehicle allowance per company policy” has outsourced the negotiation to the candidate’s imagination. Each line needs one sentence, written before the offer conversation:
- Truck. Who owns it, what class it is, whether personal use is allowed, and who else may drive it.
- Allowance. The monthly amount, whether it runs through payroll as wages, and when it is reviewed.
- Mileage. The rate basis and the logging tool. A log nobody keeps turns a clean reimbursement into wages.
- Per diem. The daily rate, the days it covers, the expected duration, and the trips home.
- Fuel card and phone. The personal-use rule, stated once.
None of this costs more than the offer you were already making. It costs an hour with the CPA and a paragraph in the letter. A candidate will forgive a base that is $5,000 light. Discovering in March what the truck really costs is a different matter.
Offer design is part of confidential executive search for mandates that cannot be publicly posted, across project management, field operations and estimating seats. The employer page sets out how a search starts.
Sources and further reading
- IRS Publication 463, travel, gift and car expenses
- Publication 15, employer’s tax guide
- Publication 15-B, employer’s tax guide to fringe benefits
- Per diem rates, US General Services Administration
- Metro wage data, construction managers (11-9021)