Buy vs Lease for the Self-Employed
For a self-employed Schedule C filer or single-member LLC, the buy-vs-lease decision is fundamentally different from the personal-buyer comparison. Three tax mechanisms (Section 179, bonus depreciation under IRC 168(k), and the actual-expense lease deduction) all interact with the business-use percentage to change the after-tax cost of either path. The OBBBA loan-interest deduction does not apply to business vehicles. The standard mileage rate is usually simpler but often less generous than the actual-expense method on heavy-business vehicles. This guide walks through the three tax paths, the mileage-log requirements, and the specific scenarios where lease beats buy and where buy beats lease for self-employed taxpayers.
The three tax paths, summarized
Standard mileage rate. The simplest method. The IRS publishes a per-mile rate (for 2026, $0.725 per business mile, per IRS Standard Mileage Rates). The taxpayer keeps a mileage log and multiplies business miles by the rate. No tracking of gas, insurance, or repairs is required. The standard rate already includes a depreciation component. Once chosen on a purchased vehicle in year one, you can switch to actual-expense in later years only with strict limits; on a leased vehicle, you must use the same method for the entire lease term.
Actual-expense method, leased vehicle. The lease payment, fuel, insurance, registration, repairs, and tires are summed and multiplied by the business-use percentage. The IRS adds an inclusion amount for leased vehicles above an annually-published FMV threshold (around $60,000 for 2026), modestly reducing the deduction. Per IRS Publication 463, the inclusion amount tables are in the back of the publication and updated each year.
Actual-expense method, purchased vehicle, with Section 179 and bonus depreciation. The taxpayer claims a portion of the vehicle's purchase price as a Section 179 deduction in year one (capped per IRC 280F), plus 100% Section 168(k) bonus depreciation on the remainder (restored permanently by OBBBA for vehicles placed in service after January 19, 2025), which absorbs essentially all remaining basis in year one for vehicles not constrained by the 280F luxury-auto cap. This front-loads the deduction heavily into year one for vehicles purchased for predominantly business use. Multiply each year's deduction by the business-use percentage.
Worked example: 80% business use, $48,000 SUV over 6,000 lbs GVWR
A self-employed consultant drives 18,000 business miles per year (4,500 personal). Vehicle: 2026 Toyota Sequoia (GVWR 7,300 lbs, over 6,000 threshold so eligible for the higher Section 179 SUV cap). Negotiated price $48,000. Business use 80%.
Buy path: Section 179 election captures roughly $32,000 of the basis in year one (per the SUV cap). 100% bonus depreciation for 2026 captures the remaining $16,000 in full. Year one total depreciation: $48,000 multiplied by 80% business use = $38,400 deduction. At a 25% combined marginal federal and SE-tax rate, tax savings in year one: roughly $9,600. The basis is fully depreciated in year one, so no MACRS deductions carry into later years. Total tax benefit concentrated entirely up front.
Lease path: Lease at $675 per month for 36 months = $24,300 in lease payments. Plus fuel, insurance, repairs, registration at perhaps $4,200 per year = $12,600 over three years. Total actual expenses: $36,900. Multiplied by 80% business use = $29,520 deductible over three years (roughly $9,840 per year). Tax savings at 25% rate: $2,460 per year, or $7,380 over three years.
The buy path yields larger year-one tax savings ($7,040 vs $2,460) but loads them up front. The buyer can then re-depreciate a different vehicle in year four. The lease path yields a smoother three-year tax-saving stream but turns into a re-lease decision at month 36. Over a five-year window with consistent 80% business use, the two paths converge in total tax savings to within $1,500 to $2,500 of each other, with buy slightly ahead. The decision often comes down to cash flow (lease wins) versus tax-deduction concentration (buy wins).
When standard mileage beats actual expense
The standard mileage rate is the simpler and often the better choice for self-employed taxpayers driving high business miles on inexpensive vehicles. At $0.725 per mile, 20,000 business miles per year on a 2020 Toyota Corolla (cost basis $14,000, current value $12,000) generates a $14,500 deduction with no need to track gas, insurance, or repairs. The actual-expense method on the same vehicle would yield depreciation of perhaps $2,200 (year five of MACRS) plus $2,800 in fuel, insurance, and maintenance multiplied by business-use percentage, totaling around $4,500 to $5,500.
The crossover point is roughly: standard mileage wins on inexpensive, high-mileage vehicles; actual expense wins on expensive (above $40,000) or low-mileage (under 10,000 business miles per year) vehicles. The CPA-recommended approach: estimate both methods for the first tax year before committing, since the choice is locked in for the vehicle's service life on a purchase (or for the lease term on a lease).
Audit risk and the mileage log
Vehicle deductions are an IRS audit flag for self-employed filers, particularly when the claimed business-use percentage is high (90%+) on a single household vehicle, when Section 179 is claimed on a near-luxury SUV, or when actual-expense deductions exceed standard-mileage by a wide margin. The IRS does not disallow the deduction simply because it is large; the disallowance happens when the documentation does not support the claim.
The required documentation is a contemporaneous mileage log (date, destination, business purpose, miles) covering every business trip, plus receipts for gas, insurance, repairs, and registration if claiming actual expense. Mileage-tracking apps (MileIQ, TripLog, Everlance, Stride) automate the log and export an IRS-ready PDF at year end. The cost is $5 to $10 per month and the audit defensibility is substantial.
For a self-employed taxpayer with 80%+ business use on a vehicle over $40,000 MSRP, buying with Section 179 plus bonus depreciation typically generates more year-one tax savings than leasing with actual-expense deduction. For inexpensive vehicles (under $25,000) or low business-use percentages (under 60%), the standard mileage method on a purchased vehicle usually wins. Leasing wins when the taxpayer wants smooth cash flow, plans to upgrade every 36 months, and values a fixed-known monthly cost in their P&L.