{"post":{"slug":"mileage-deduction-explained-2026","title":"The Mileage Deduction: Records Are the Whole Game","excerpt":"The standard mileage rate makes deducting vehicle use simple. What makes claims fail is not the calculation but the absence of a contemporaneous log showing which trips were business.","category":"finance","date":"January 8, 2026","author":"ByteLedger Team","content":"<span class=\"dropcap\">V</span>ehicle expenses are among the most commonly claimed and most commonly disallowed self-employment deductions. The calculation is straightforward; the substantiation is where claims fail.\n\nThe requirement is a contemporaneous record showing the date, mileage, destination, and business purpose of each trip. An annual estimate produced at filing time is not that, and it is the version most people have.\n\n## What changed in 2026\n\n- **The standard rate continued adjusting annually.** The per-mile figure moves with costs and is set each year.\n- **Automatic tracking apps became widespread.** GPS-based logging removed most of the record-keeping burden.\n- **Electric vehicles complicated actual-expense calculations.** Different cost structures made the comparison less obvious.\n- **Substantiation enforcement stayed firm.** Inadequate records remained the primary reason claims were reduced.\n\n## Commuting is not deductible\n\nThe rule that eliminates most claimed mileage.\n\nTravel between your home and a regular place of work is commuting, and commuting is a personal expense regardless of distance, regardless of whether you are self-employed, and regardless of how inconvenient it is.\n\nWhat is deductible is travel **between business locations** — from your office to a client, from one client to another, to a supplier, to a business meeting.\n\nThe important interaction: if your home qualifies as your **principal place of business**, then trips from home to a client are travel between business locations rather than commuting. That single fact frequently converts a large share of mileage from non-deductible to deductible, which is one of the underappreciated benefits of a qualifying home office — see [the home office deduction](/blog/home-office-deduction-2026).\n\n| Trip | Deductible? |\n| --- | --- |\n| Home to a regular office | No — commuting |\n| Home to a client, with a qualifying home office | Generally yes |\n| Home to a client, without one | Generally no |\n| Office to client | Yes |\n| Client to client | Yes |\n| Office to home | No |\n| Trip combining business and personal | Business portion only |\n\n## The log\n\nWhat a defensible record contains, per trip: the date, the starting and ending mileage or the distance, the destination, and the business purpose.\n\n**Contemporaneous** means recorded at or near the time. A log reconstructed from calendar entries months later is weaker evidence, and one estimated at filing time is close to worthless if examined.\n\nAutomatic tracking applications solve this well — they record trips via location and let you categorise each as business or personal, producing a compliant log with minimal effort. Given how many claims fail on records rather than eligibility, this is among the highest-value small tools available to a self-employed person.\n\nTotal annual mileage should also be recorded, since the business percentage is business miles divided by total miles, and the actual expense method depends on it.\n\n## Standard rate or actual expenses\n\n**The standard mileage rate** multiplies business miles by a per-mile figure covering depreciation, fuel, maintenance, and insurance. Simple, and it still requires the mileage log.\n\n**Actual expenses** totals real vehicle costs and deducts the business-use percentage. More record-keeping — every receipt — and frequently larger for expensive vehicles or high running costs.\n\nThe choice has lock-in consequences. Rules generally require the standard rate to be used in the first year a vehicle is placed in service if you want the option to switch later, and switching from actual expenses to the standard rate is restricted where certain depreciation methods were used.\n\nSo the first-year choice is more consequential than it appears, and the conservative approach for a vehicle you may hold for years is to start with the standard rate to preserve flexibility.\n\n## Common mistakes\n\n- **Claiming commuting.** Not deductible.\n- **Estimating at filing time.** The weakest possible substantiation.\n- **No business purpose recorded.** Date and distance alone is incomplete.\n- **Not tracking total mileage.** Needed for the percentage.\n- **Switching methods without checking the rules.** Restricted.\n- **Claiming a vehicle used mostly personally at a high business percentage.** A common examination point.\n- **Forgetting parking and tolls.** Generally deductible separately from the mileage rate.\n\n## FAQ\n\n**Which method gives a bigger deduction?**\nDepends on the vehicle and mileage. Expensive vehicles with high running costs frequently favour actual expenses; economical vehicles with high mileage frequently favour the standard rate. Calculate both in the first year.\n\n**Do I need receipts with the standard rate?**\nNot for running costs, and you still need the mileage log, and receipts for separately-deductible items like parking and tolls.\n\n**What about an electric vehicle?**\nThe standard rate applies the same way. Actual expenses may look different given lower running costs and potentially higher depreciation, so the comparison is worth running specifically.\n\n**Can I deduct mileage for a vehicle I lease?**\nYes, under either method, with lease-specific rules for the actual expense calculation.\n\n## Where to go next\n\nFor how a home office changes the commuting analysis, read [the home office deduction](/blog/home-office-deduction-2026). For the broader self-employment tax picture, [payroll taxes for the self-employed](/blog/payroll-taxes-self-employed-2026) and [the QBI deduction](/blog/qbi-deduction-explained-2026).\n\nThis is general information, not tax advice. Rates and rules change annually; confirm current figures.","hue":287,"metaTitle":"The Mileage Deduction: Records Are the Whole Game","metaDescription":"Why commuting is not deductible, what a contemporaneous mileage log must contain, and how the standard rate compares with actual expenses.","keywords":["mileage deduction","business mileage log","standard mileage rate","actual vehicle expenses","commuting rule","self employed vehicle","substantiation requirements","tax planning 2026"],"tldr":["**Commuting is not deductible** — travel between home and a regular workplace is personal.","**Contemporaneous records are the requirement** — reconstructing a year of trips afterwards is weak evidence.","**Standard rate versus actual expenses is a choice with lock-in** — switching later is restricted.","**A qualifying home office changes the commuting analysis** — trips from a home principal place of business can be business travel.","**Skip:** estimating annual mileage at filing time. That is the claim most likely to fail."],"readTime":"4 min read","wordCount":851},"related":[{"slug":"home-office-deduction-2026","title":"The Home Office Deduction: Who Can Actually Claim It","excerpt":"Working from home does not make your home office deductible. 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