Truck Depreciation Calculator
Calculate annual and monthly truck depreciation using straight-line method, plus depreciation per mile for cost analysis.
Results
Visualization
How It Works
Class 8 trucks depreciate on a steep front-loaded curve. NADA and J.D. Power data show a $160K new Cascadia loses ~22% in year 1, ~15% in year 2, ~12% in year 3, then declines to 8-10%/yr through year 7. Tax depreciation uses different math: IRS Publication 946 puts heavy trucks (over 13,000 lb GVW) on 3-year MACRS for general-purpose Class 8s, with Section 179 expensing up to $1.16M (2024) and Section 168(k) bonus depreciation at 60% (2024), 40% (2025), 20% (2026), 0% (2027). Book depreciation on financial statements typically uses 5-year straight-line for owner-operators or 7-year for fleets. The cash reality: your loan payment is fixed, the truck's market value drops faster early, and you can be underwater for 24-36 months.
The Formula
Monthly Depreciation = Annual / 12
Depreciation Per Mile = Annual / Annual Miles
Variables
- Purchase Price — Total acquisition cost — invoice + freight + setup + state title/registration. FET (12% federal excise tax under IRC Section 4051) is not separately depreciable and is rolled into basis.
- Salvage Value — Expected sale or trade value at disposal. NADA Black Book and J.D. Power Commercial Truck Guide are industry references — actual values run 5-15% below trade-in for private sale.
- Useful Life — Tax: 3-yr MACRS (general purpose) or 5-yr (vocational). Book: 5-7 yr straight-line. Operational: 600K-1M mi typical for OTR.
- Annual Miles — Denominator for per-mile depreciation; ATRI uses 100K-110K avg for owner-operators, 110K-130K for company OTR
Worked Example
New 2024 Freightliner Cascadia, 6x4 day cab, DD15 505HP, DT12 auto, sleeper. Invoice $148,500 + FET (12% on chassis under IRC Section 4051) $13,200 + freight/setup $1,800 = total cost $163,500. Owner buys outright (no financing), runs 110K mi/yr. Tax path: Section 168(k) bonus 60% = $98,100 deduction year 1, plus 5-yr MACRS on remaining $65,400 = ~$13,080 year 1 (1st-year half-convention). Combined year-1 deduction: $111,180. Book path (straight-line, 6 yr, $30K salvage): $22,250/yr = $0.202/mi. At year 5, truck market value (NADA) ~$48K but book value $52,500 — close to even. ATRI 2024 truck-payment line of $0.317/mi assumes financed acquisition; this owner avoids interest entirely.
Practical Tips
- Section 168(k) bonus depreciation phases out fast: 60% in 2024, 40% in 2025, 20% in 2026, 0% in 2027. If you plan a 2025+ truck buy, model the cash impact — a $160K tractor placed in service Dec 2024 nets ~$24K more first-year deduction than the same buy in Jan 2025.
- Section 179 expensing under IRC Section 179(b) caps at $1.16M (2024) with $2.89M phase-out — fleet operators benefit; single-truck owner-operators typically use 168(k) bonus first, then 179 on the residual to avoid wasting deductions.
- FET (Federal Excise Tax) under IRC Section 4051 is 12% on first retail sale of trucks over 33,000 lb GVW, trailers over 26,000 lb, and Class 8 chassis. Goes into basis for depreciation; cannot be separately deducted. Rolled into financing on most retail buys.
- Track NADA Black Book monthly during years 4-7 of ownership — that's when market value can lag or lead financed payoff and create refinance/trade opportunities. A $20K equity flip on year-5 trade can fund the down payment on the replacement truck.
- For pricing loads, use cash-basis depreciation (your actual P&I payment / miles) rather than book — book matches GAAP but understates the cash drain in years 1-3 when book exceeds market value.
- Per-diem deduction (IRS Publication 463, Schedule C for Schedule 1099 owner-operators) at $69/day domestic CONUS for 2024 ($74/day high-cost areas) is independent of depreciation but stacks with it on total tax planning.
Frequently Asked Questions
What is Section 168(k) bonus depreciation in 2024?
Section 168(k) lets businesses deduct a percentage of qualified property cost in the year placed in service. The bonus phases down: 80% in 2023, 60% in 2024, 40% in 2025, 20% in 2026, 0% in 2027. Heavy trucks qualify. A $160K tractor in 2024 generates a $96K immediate deduction plus regular MACRS on the remaining basis.
What is the Section 179 limit for trucks in 2024?
Section 179 expense election under IRC Section 179(b) is $1,160,000 for 2024 with phase-out beginning at $2,890,000 of qualifying property placed in service. Heavy trucks (over 6,000 lb GVW) qualify without the SUV $30,500 sub-cap. Most single-truck owner-operators use 168(k) first because Section 179 cannot create a net business loss, while 168(k) can.
How fast do new semi trucks lose value?
NADA and J.D. Power data: ~22% year 1, ~15% year 2, ~12% year 3, then 8-10%/yr through year 7. A $165K Cascadia is typically $128K at year 1, $109K at year 2, $96K at year 3, $58K-$68K at year 5, $42K-$50K at year 7. Glider kits and pre-emissions trucks (2007 and earlier) hold value differently due to regulatory scarcity.
Should I depreciate over 3 or 5 years?
IRS Publication 946 puts general-purpose heavy trucks on 3-year MACRS Class — but most owner-operators see better tax outcomes using Section 168(k) bonus depreciation (60% in 2024) plus 3-year MACRS on residual basis. Vocational trucks (dump, garbage, concrete) are 5-year property. Trailers are 5-year. Consult a CPA familiar with trucking; the wrong election is rarely amendable.
What is the FET on a new truck?
Federal Excise Tax under IRC Section 4051 is 12% of the first-retail-sale price on Class 8 trucks (over 33,000 lb GVW), trailers over 26,000 lb, and tractor chassis. On a $148,500 Cascadia, FET = $17,820. Charged once at first sale; rolls into financed amount and depreciable basis.
How does mileage affect resale value?
Each 100K mi above NADA-typical reduces value $8K-$15K depending on year and brand. A 4-year-old Cascadia at 600K mi books at ~$72K (NADA mid); same truck at 800K mi books ~$58K. Engine make matters: Detroit DD15 and PACCAR MX-13 hold residuals 5-10% better than older Cummins ISX or pre-2017 emissions setups due to aftertreatment regulations.
Can I take Section 179 if I have no profit?
No. IRC Section 179(b)(3) limits the deduction to taxable business income — Section 179 cannot create or increase a net operating loss. Section 168(k) bonus depreciation has no such limit, so it can drive losses that carry forward. This is the main reason 168(k) gets used first on big truck buys, with 179 as a residual cleanup tool.