Temporary vs. Indefinite Work Assignments: One-Year Rule and Tax Home

For federal tax purposes, a work assignment is temporary if you realistically expect it to last one year or less, and indefinite if you expect it to run longer. That single line, set by Internal Revenue Code Section 162(a), decides whether your tax home stays where it is, whether your travel costs can be deducted or reimbursed tax-free, and whether per diem payments from your employer show up as taxable wages.¹ Understanding how the IRS applies the temporary vs. indefinite work assignment rules can be the difference between thousands of dollars in tax-free reimbursements and an unwelcome addition to your W-2.

The One-Year Rule

The statute is blunt. You are not treated as temporarily away from home during any period of employment that exceeds one year.¹ What matters is what you realistically expected on the day the assignment began, not what actually happened.

Sign a 15-month contract that wraps up in nine? Still indefinite, because you expected more than a year at the start. Accept an eight-month job that stretches to ten because the client needed more work? Still temporary the whole way through, because you never expected to cross the line. Revenue Ruling 93-86 walks through the same logic: a worker who expected six months and stayed ten can deduct for the full period; a worker who expected 18 months but finished in ten cannot deduct at all.

Your Tax Home Is Not Where You Sleep

The temporary vs. indefinite framework only helps if you have a tax home somewhere else to be away from. Your tax home is the general area of your main place of business, not where your family lives.² When you work in more than one place, the IRS weighs three factors to decide which qualifies as your main one: how much time you spend at each location, how much business activity happens at each, and the financial significance of the work performed. Time is the most important.

Get this piece right before worrying about the one-year rule. If you have no regular place of business and no fixed home you maintain, the IRS calls you an itinerant, and an itinerant has no tax home to leave.³ Itinerants are never away from home for tax purposes, so no travel deduction is ever available regardless of how short each assignment is.

What Actually Changes Between Temporary and Indefinite

When an assignment is temporary, your tax home stays put. Transportation, lodging, and meals at the work location count as business travel expenses. If your employer reimburses them through a qualifying arrangement, the money does not appear on your W-2 and no payroll taxes are withheld against it.

When an assignment is indefinite, your tax home moves to the new work location on day one. You are no longer away from home, so travel, lodging, and meal costs become ordinary personal living expenses. Any per diem or housing allowance your employer pays becomes taxable compensation, included in Box 1 of your W-2 and subject to federal income tax, Social Security, and Medicare withholding. A $150 daily per diem that was invisible on your paycheck during a temporary assignment starts generating real tax liability the moment the assignment turns indefinite. Owning a house or keeping a family residence elsewhere does not change this result.

One boundary worth naming: moving expenses do not fill the gap. The moving expense deduction has been permanently eliminated for everyone except active-duty military members and certain intelligence community employees.⁴ If your assignment becomes indefinite and you relocate, neither you nor your employer gets a tax break on the move.

Who Can Actually Claim the Deduction in 2026

Knowing the classification does no good if you cannot claim the deduction in the first place. The One, Big, Beautiful Bill Act permanently eliminated miscellaneous itemized deductions subject to the 2% adjusted-gross-income floor, which is the category unreimbursed employee travel expenses used to sit in.⁵ Most W-2 employees cannot deduct their own travel costs on their tax returns, even on a clearly temporary assignment.

A few narrow categories of employees can still deduct travel directly, using Form 2106 as an adjustment to income rather than an itemized deduction:

Armed Forces reservists traveling for reserve duty
Qualified performing artists meeting specific income and expense thresholds
Fee-basis state or local government officials
Employees with impairment-related work expenses

Self-Employed Workers

If you are self-employed, the temporary vs. indefinite distinction applies fully. Qualifying travel expenses go on Schedule C (or Schedule F for farming), and the 2% floor that blocks employee deductions does not touch you.² Independent contractors, sole proprietors, and freelancers who maintain a tax home and travel to a temporary work location can deduct transportation, lodging, and meals just as the law has always allowed. The one-year rule still decides whether the assignment qualifies.

Employees Under an Accountable Plan

For most W-2 employees, the practical benefit of a temporary classification runs through their employer’s reimbursement arrangement, not their own tax return. Under an accountable plan, your employer reimburses your travel expenses tax-free. Those payments stay out of Box 1 of your W-2 and out of Social Security and Medicare wages.³ An accountable plan has three requirements:

Business connection: the expenses must be for deductible business costs incurred while performing services for your employer.
Substantiation: you must adequately document the expenses and submit them within a reasonable time.
Return of excess: you must return any reimbursement that exceeds your documented expenses within a reasonable time.

On a temporary assignment, your travel costs qualify as deductible business expenses, so reimbursements flow through the accountable plan tax-free. On an indefinite assignment, those same costs are personal living expenses at your new tax home, and any payments your employer makes to cover them become taxable wages.³ If the arrangement fails any of the three requirements, it is a nonaccountable plan and reimbursements are folded into taxable wages regardless of assignment status.

What Qualifies as a Travel Expense

Assuming you are self-employed or covered by an accountable plan, the following costs qualify while you are on a temporary assignment away from your tax home:

Transportation: airfare, train or bus tickets, or the cost of driving your own vehicle between your tax home and the temporary work location.³
Lodging: hotel costs, short-term apartment rent, or similar housing at the temporary location.
Meals: food costs while away, subject to a 50% limitation.²
Incidental expenses: tips, baggage handling, dry cleaning, and similar costs tied to the travel.

Expenses must be ordinary and necessary. Lavish or extravagant costs do not qualify even if they relate to the assignment.¹

2026 Mileage Rate

If you drive your personal vehicle to the temporary work location, the standard mileage rate for 2026 is 72.5 cents per mile.⁶ The flat rate replaces tracking actual expenses like gas, insurance, and depreciation. Pick a method and apply it consistently for the year.

Per Diem for Meals

Instead of saving every meal receipt, you can use the IRS standard meal allowance. For travel within the continental United States from October 2025 through September 2026, the meal-and-incidental-expenses per diem is $86 per day in high-cost areas and $74 elsewhere.⁷ Transportation-industry workers use $80 per day for domestic travel and $86 per day outside the continental United States. Self-employed individuals can use the per diem for meals but not for lodging, which requires actual receipts. The 50% meal limitation still applies.

When a Temporary Assignment Becomes Indefinite

Assignments evolve. A nine-month project gets extended to fourteen. A client asks for a few more weeks, then a few more after that. The IRS does not wait until you cross the one-year mark on the calendar. The classification changes on the date your realistic expectation changes.

Picture this. You start expecting nine months of work. After eight months, your employer confirms the project needs another seven. Total expected duration is now fifteen months. The assignment became indefinite the day you learned about the extension. Travel expenses from the first eight months remain deductible or tax-free-reimbursable; everything from the extension date forward is personal expense.²

The cutoff runs from the updated timeline, not the anniversary of your start date. Record the exact date you received confirmation of the extension. Reconstructing that date years later during an audit is far harder than noting it in real time.

Breaks in Service and Returning to the Same City

Travel workers often ask whether a short gap between contracts resets the one-year clock so they can return to the same city as a fresh temporary assignment. A quick break does not reset anything. IRS chief counsel guidance points to at least seven months as a possible minimum, with twelve months being the safer threshold. A 30-day gap between assignments in the same area does not do it.

If you sign an extension before the current assignment ends, the IRS treats the whole period as continuous. Even without a formal extension, brief interruptions of a few weeks do not turn what would otherwise be an indefinite assignment into a string of temporary ones.

Rotating to a genuinely different city for a new project does stop the clock at the first location and start a new one at the new location. The one-year rule applies per location, not cumulatively across all travel. But if you return to the first city after a short detour elsewhere, the IRS may treat it as a continuation of the original assignment. Working at your home office between assignments is the cleanest way to avoid that trap.

Spousal and Family Travel

Bringing a spouse or child on a temporary assignment almost never creates a deductible expense. Under IRC Section 274(m)(3), travel costs for a family member are deductible only if all three of the following are true: the family member is an employee of the same employer, their travel serves a genuine business purpose, and the expenses would be independently deductible by that family member.⁸ A genuine business purpose means something more than attending a dinner or providing company.

There is one workaround. The employer can treat the cost of spousal travel as additional compensation to the employee. The employer then deducts it as a compensation expense, but the amount shows up as taxable income on the employee’s W-2. The tax benefit shifts to the employer; the traveler still pays tax on the value.

Documentation That Protects the Classification

The burden of proving an assignment is temporary sits with you, not the IRS.⁹ Without the right records, the IRS can reclassify your expenses and assess back taxes and penalties.

Two record sets matter. First, document the expected duration from the start. Keep employment contracts, offer letters, or statements of work that specify start and end dates. If the timeline changes mid-assignment, save the email or amended contract that confirms the new expected end date. That single document is the most important piece of evidence for showing when your status shifted.

Second, substantiate the expenses themselves. Keep lodging and transportation receipts, or use the per diem method for meals and maintain a log of travel days. Track which days you spent at the temporary location versus your tax home. If your employer pays per diem, separate the tax-free reimbursements under the accountable plan from any amounts reported as taxable wages. A weekly spreadsheet takes minutes to keep and can prevent a five-figure adjustment years later.

1
Office of the Law Revision Counsel. 26 USC 162 – Trade or Business Expenses
2
Internal Revenue Service. Topic No. 511, Business Travel Expenses
3
Internal Revenue Service. Publication 463 – Travel, Gift, and Car Expenses
4
Internal Revenue Service. Moving Expenses to and From the United States
5
Internal Revenue Service. 2026 Standard Mileage Rates, Notice 2026-10
6
Internal Revenue Service. IRS Sets 2026 Business Standard Mileage Rate at 72.5 Cents Per Mile, Up 2.5 Cents
7
Internal Revenue Service. Notice 2025-54, 2025-2026 Special Per Diem Rates
8
Internal Revenue Service. Spousal Travel
9
Internal Revenue Service. Burden of Proof