What is the best way for a business to keep track of the miles it drives for work?

What makes one way of tracking miles better than another?

No method wins for everyone; the best one fits how you drive, who drives and how much routine you will actually keep. Judge each option on five criteria:

• Completeness. Every business trip in the period is captured, and a quiet week can be told apart from a missed one.
• Timeliness. Each entry is made while the trip is still remembered, on the day or within the week.
• Accuracy. Miles come from the odometer, GPS or a known route length, and each purpose is specific.
• Sustained effort. The routine costs little enough per trip to survive the busiest month.
• Standing. The record shows every element federal rules require and was made when it carries the most weight.

Weigh sustained effort first. A thorough method dropped at the end of April leaves eight months without a timely record: unless other evidence shows the four logged months are representative of the rest of the tax year, those months can only be pieced together afterwards, and Treasury regulation section 1.274-5T gives such a record less weight. A lighter method that runs all year therefore beats a better one that stops. Pick the method you are confident will still be running in the last week of the tax year, then make it as accurate as that allows.

What must every method produce, whatever the medium?

Section 274(d) of the Internal Revenue Code allows no deduction or credit for listed property unless the taxpayer substantiates it by adequate records or by sufficient evidence corroborating the taxpayer's own statement. Treasury regulation section 1.274-5T, which sets the substantiation rules, measures the use of automobiles and other means of transportation in miles and requires these elements:

• Business miles. The mileage of each business use is recorded.
• Date. The date of each use is recorded.
• Business purpose. The purpose of each use is recorded; section 1.274-5T generally requires it in writing, but not where it is evident from the surrounding facts and circumstances, as it ordinarily is for a salesman calling on customers on an established sales route.
• Total miles. The vehicle's total use for the taxable period, business and personal together, is recorded.

Section 1.274-5T says an adequate record is an account book, diary, log, statement of expense, trip sheets or similar record that, with documentary evidence, establishes each element, with each entry made at or near the time of the use; it generally must be written, and a record of an automobile's business use kept in a computer memory device with the aid of a logging program counts. The medium is your choice; the elements and the timing are not.

Treasury regulation section 1.274-5, in its rule on use of mileage rates for vehicle expenses, says a taxpayer using those rates is still not relieved of substantiating the business mileage, time and business purpose of each use, so the choice of cost method does not shorten the log. Section 274(d) of the Internal Revenue Code does not apply to a qualified nonpersonal use vehicle, which section 1.274-5 defines as one that by its design is not likely to be used more than a de minimis amount for personal purposes; which vehicles qualify is a separate question, so keep logging until you have confirmed that yours does.

Log the purpose with the trip: miles without a purpose do not make a business mileage record, and purpose is the element hardest to recall months later. To test any method, pick a business trip from last month and see whether the record gives its date, miles and purpose without asking anyone, and whether each entry was made at or near the time.

Why do the start and end odometer readings matter?

Section 1.274-5T requires the vehicle's total use for the taxable period as well as each business use. The business share is business miles divided by total miles, and a trip log, however careful, shows only the business miles.

The direct evidence of the total is an odometer reading on the first and last day of your tax year, plus a reading whenever a vehicle is bought, sold or handed to a different driver. Take one at each month end too; it feeds the monthly check below.

Suppose a van's odometer read 18,240 on the first day of the tax year and 41,610 on the last: 23,370 miles in all. The log shows 14,022 business miles, a 60 percent business share. Without the two readings, the 14,022 miles stand alone and the share cannot be shown, however well each trip was logged.

If the opening reading was never taken, the nearest dated readings on service invoices or inspection records are the closest substitutes; note which document each came from. The share holds only if business and total miles cover the same span: if the substitute is dated after the tax year began, count business miles from that date too or record how earlier miles were estimated and from what; if before, note how many days of the previous tax year it adds. Never divide a full tax year's business miles by a part-year total.

When does the record have to be made?

Section 1.274-5T says a contemporaneous log is not required, but a record made at or near the time of the use, supported by sufficient documentary evidence, has a high degree of credibility not present in a statement prepared afterwards. It adds that a later statement needs corroborating evidence with a high degree of probative value to reach the same credibility.

Section 1.274-5T treats an entry as made at or near the time when the taxpayer has full present knowledge of each element, and counts a log maintained weekly that accounts for the week's use as made at or near the time. So every method should put each week's trips on record by the end of that week.

Label any reconstructed entry as a reconstruction, dated when written. A year-end rebuild from calendars presented as a contemporaneous log misstates what the record is and hides how much corroboration it needs.

What are the ways of capturing miles, and how do they compare?

Every method falls into one of three classes. Capture at the time can run for every trip or, where permitted, for a sample period; a reconstruction cannot be the sample, because section 1.274-5T requires sample periods to be adequate records, made at or near the time.

What does capturing at the time of driving involve?

The driver records each trip as it happens or by the end of the week, in an app that logs trips automatically, by manual entry in an app, in a notebook kept in the vehicle or on a weekly sheet. Miles are measured. The weakness is the habit: automatic capture still needs someone to mark each trip as business and give its purpose, and it fails silently when the phone stays behind or the app stops running.

What does deriving trips from other business records involve?

Trips are worked out from a job schedule, dispatch system, appointment calendar or delivery records, with distances taken from a map. Where such a record already exists, the only new routine is the weekly derivation and export. But it records the work, not the driving: supply runs, detours and cancelled visits go missing, map distances are not driven miles, and the method is only as complete and durable as its source, so keep a dated export of each week's schedule. Section 1.274-5T does not address derived records. A weekly derivation comes closest to the weekly log it treats as timely only if missed trips are added that week and driven miles replace map distances where they differ; derived at year end, it is a statement prepared afterwards.

What does periodic reconstruction involve?

Months are rebuilt at once from memory, calendars and receipts. It costs nothing until it falls due, then costs the most and carries the least weight. It is the fallback for miles already driven, not a plan.

Route-based businesses often do best with a deliberate mix: regular routes taken from the schedule, and anything off the schedule logged at the time.

How do the classes score against the criteria?

The ratings below are general; your own driving moves the scores, as set out in step 3:

Then apply it to your own situation in this order:

1. Note your driving pattern, number of drivers, existing job records, how much of the tax year has passed and whether the vehicle is also used personally.
2. Strike any class that cannot work for you, such as a derived method with no complete job record, or a sample period whose conditions you cannot meet. Strike periodic reconstruction for the rest of the tax year; it is only for months already driven.
3. Score each remaining class 0, 1 or 2 on each criterion, counting sustained effort twice, then apply the adjustments below.
4. Choose the highest total, and on a tie choose the stronger standing.

Adjust the step 3 scores as follows:

Can a sample period stand in for logging every trip?

Sometimes. Section 1.274-5T lets a taxpayer maintain an adequate record for portions of a taxable year and use it for all or a portion of the tax year, if the taxpayer can demonstrate by other evidence that the recorded periods are representative of the use for the tax year or that portion. Its examples show where the line falls:

• Three months extended. A record for the first three months showing 75 percent business use, with invoices from subcontractors and paid bills showing the business continued at about the same rate, was sufficient corroborative evidence for the tax year, provided other circumstances stayed the same, for example no second car was obtained for exclusive business use.
• One week a month. A record for the first week of every month, with invoices showing the business continued at the same rate in the other weeks, was sufficient because the weekly records were representative of each month's use.
• Irregular use. A salesman whose business use in the first three weeks of each month did not follow a consistent pattern from day to day or week to week could not extend a record of the fourth week, because that week was not representative of use in other periods.

Section 1.274-5T also bars sampling for an automobile or other vehicle of an employer that is made available for use by more than one employee for all or a portion of a taxable year.

Decide this at the start, not at year end. A sample needs a steady pattern, sample periods that are themselves adequate records, and other evidence that those periods are representative, such as monthly invoices or job counts. You still need the tax year's total miles, which the odometer readings give you. If the pattern changes, go back to logging every trip; once the tax year has passed, a full log cannot be produced.

Which method fits your driving and your drivers?

If you will not keep a daily habit, a weekly log or a weekly derivation from job records is the realistic floor.

What if you make many short stops a day?

Logging every stop by hand is the method that gets abandoned. Section 1.274-5T lets uses that form part of a single use, such as a round trip or uninterrupted business use, be accounted for by a single record; its example is a truck making deliveries at several locations, beginning and ending at the business premises, recorded as a single record of miles driven. Under section 1.274-5T, a de minimis personal use, such as a stop for lunch on the way between two business stops, does not interrupt the business use. For a taxpayer who uses a truck for business and personal purposes and whose only business use is deliveries to customers on an established route, section 1.274-5T accepts a record of the total miles for the tax year, the route's length once and the date of each trip made at or near the time, or each trip's date shown by a receipt, record of delivery or other documentary evidence. Where those conditions fit, a round of stops can be one entry: the date, the business miles and the business purpose; under section 1.274-5T the route or stop list stands in for a written purpose only where the purpose is evident, as on an established delivery route.

What if employees do the driving?

When the driver is not the person who needs the record, the method needs submission, a deadline and a way to spot a driver who has stopped. For vehicles the business provides, section 1.274-5T points to separate rules for substantiating business use of employer-provided vehicles and to special rules in section 1.274-6T that can change what has to be recorded; confirm them before settling the drivers' routine. Either each driver keeps and submits a log, or the business captures centrally from a system drivers already use, such as dispatch records plus odometer readings at each vehicle hand-over; central capture lets the business check scheduled trips and total miles without asking the driver, but unscheduled trips and personal use must still come from the driver. Section 1.274-5T treats an expense account statement transcribed from a log kept at or near the time, and submitted by an employee to the employer in the regular course of good business practice, as itself made at or near the time. Set a weekly deadline, check each driver's entries against that driver's dispatched jobs, and chase a missing week at once. A week a driver did not record is rebuilt from dispatch and job records, marked as reconstructed and dated when written. How drivers are reimbursed is a separate question.

What if your business driving is occasional or seasonal?

A continuous app is out of proportion to a few trips a month and tends to lapse in quiet periods. Log each business trip when it happens, and at each month end record the odometer reading and, in a month with no business trips, a dated line saying so; a quiet month then reads as a recorded zero, not a gap.

How do you check that the method is still capturing?

Every method fails quietly: an app stops running, a notebook stays in the other truck, a driver stops submitting. Only a comparison with something outside the method shows it. Once a month, run this check:

1. Read each vehicle's odometer and work out the month's total miles.
2. Compare the month's logged business miles with that total and with earlier months; business miles above the total, or a share far below normal, point to a gap or an error.
3. Compare the days with log entries against the days with jobs, invoices, fuel purchases or dispatches; a working day with driving but no entry is a gap. For a log derived from job or dispatch records, compare only with the odometer total and fuel purchases, and ask each driver monthly for unscheduled trips.
4. For employee drivers, confirm each driver's log arrived by the deadline.

When they diverge, rebuild the gap that week from job records while memory is fresh, mark the added entries with the date they were added, and fix the cause. If the same gap keeps returning, the method is too heavy for your routine: switch to lighter capture at the time, such as a weekly sheet or, where a round qualifies, one entry per round, or to weekly derivation from complete job records, rather than rebuild at year end.

What can you do about the miles driven before you started?

A record for those months cannot become contemporaneous, and must never be dated as if it were. Section 1.274-5T says that a taxpayer who cannot show substantial compliance with its adequate-records requirements for an element must establish that element by the taxpayer's own statement, written or oral, containing specific information in detail, and by other corroborative evidence sufficient to establish it. For each trip's miles and date, section 1.274-5T requires that corroborating evidence to be direct evidence, such as a detailed written statement or witness account, or documentary evidence; circumstantial evidence may corroborate the business purpose of an expenditure. It does not say whether a map distance between documented stops meets that bar, so mark every map distance as an estimate. Build that evidence in this order:

1. Take an odometer reading today, date it, and make it the first entry of the new method.
2. For the earlier months, list each business trip from dated documents such as calendar entries, invoices, job and dispatch records, and fuel and toll receipts, giving the date, destination, purpose and map distance and noting the document behind each trip. Prefer documents showing the trip itself, such as dated job, delivery or toll records with addresses.
3. Find the best available opening reading for the tax year on service invoices or inspection records, and handle its date as the odometer section describes.
4. Title the result as a reconstruction prepared on the date you write it, and keep it separate from the new log.

Section 1.274-5T's right to substantiate by reasonable reconstruction arises where the taxpayer establishes that adequate records were lost through circumstances beyond the taxpayer's control, such as destruction by fire, flood, earthquake or other casualty; it addresses lost records, not records never kept. From the day of the reading forward, a record that captures each element at or near the time, supported by documentary evidence, has the credibility section 1.274-5T gives a timely record; the months before it carry only what their documents corroborate.