Personal Stop Between Two Clients: How Much of the Drive Is Still Deductible? (2026 Mileage Guide)

Published: October 6, 2026 · Reading time: 12 min

TL;DR: A personal stop between two clients does not void the drive. Publication 463's two-places-of-work rule says: "If you work at two places in 1 day, whether or not for the same employer, you can deduct the expense of getting from one workplace to the other. However, if for some personal reason you don't go directly from one location to the other, you can't deduct more than the amount it would have cost you to go directly from the first location to the second." So you deduct the direct-route miles between the two workplaces and drop only the extra miles the personal stop caused. It does not make the personal stop deductible, and it does not touch the commuting rule for the first and last legs of the day, which depends on whether your home office qualifies as your principal place of business. In 2026 each deductible mile is valued by its date: 72.5 cents through June 30, 76 cents from July 1.

You leave Client A at 2:15, you have to be at Client B by 3:30, and the pharmacy is "basically on the way." Forty minutes later you are at Client B, and at the end of the week you open your mileage log and wonder what to write.

Most mileage advice gives one of two bad answers. One says the whole trip is tainted and nothing is deductible. The other says to log it all because you were headed to a client anyway. The IRS says neither. Publication 463 answers this exact situation in one sentence, and it is a sentence most freelancers have never read.

This guide covers what that sentence does and does not buy you, how to log a day with a detour, how the rule interacts with commuting and the home office, and a worked example at the split 2026 rates. For the broader multi-stop day, see how to log mileage for multi-stop and multi-client days. For multi-day trips with a vacation tacked on, see mileage on a business trip with a personal side trip, which handles the overnight version of this problem.

What Publication 463 Actually Says

The rule sits in the "Two places of work" paragraph of the transportation section of Publication 463:

"If you work at two places in 1 day, whether or not for the same employer, you can deduct the expense of getting from one workplace to the other. However, if for some personal reason you don't go directly from one location to the other, you can't deduct more than the amount it would have cost you to go directly from the first location to the second."

Read it as two sentences with two jobs.

The first sentence is the grant. Getting from one workplace to another during the day is deductible. Publication 463 reinforces this where it defines transportation expenses as including the ordinary and necessary costs of the following: "Getting from one workplace to another in the course of your business or profession when you are traveling within the city or general area that is your tax home" and "Visiting clients or customers."

The second sentence is the cap. If a personal reason makes the route indirect, the deduction is limited to the cost of the direct route. The wording is "can't deduct more than," not "can't deduct anything." A personal stop shrinks the deduction. It does not erase it.

What the cap does not buy you

An exception in your favour is the claim most worth reading twice, so here is what this one leaves out:

• It does not make the personal stop deductible. The pharmacy run, the school pickup and the grocery stop remain personal. The cap only keeps them from contaminating the legs on either side of them.
• It does not turn commuting into business travel. The rule is about getting between two workplaces. The drive from home to your first workplace is governed by a different rule, covered below.
• It does not let you deduct the longer route. Whatever the detour adds beyond the direct-route cost is personal.
• It does not define "directly." Publication 463 gives no formula for measuring the direct route. That is a gap you fill with a reasonable, consistent method and a written note.
• It is not a guarantee that a business stop is always safe. It says how a personal reason affects the deduction. Whether a particular stop counts as a business stop is a facts question, covered further down.

The Commuting Rule Still Governs the Bookends

The two-places rule does nothing for the first and last legs of a day. Those fall under Publication 463's commuting rule:

"You can't deduct the costs of taking a bus, trolley, subway, or taxi, or of driving a car between your home and your main or regular place of work. These costs are personal commuting expenses."

And the rule is strict about distance and about working while you drive:

"You can't deduct commuting expenses even if you work during the commuting trip."

For a freelancer with no qualifying home office, that means the drive from home to the first client and the drive from the last client back home are generally not deductible, and a personal stop on either leg makes no difference because the leg is not deductible to begin with. If the first client site is a temporary work location, or you have no regular place of work and the site is outside your metropolitan area, different rules can apply; Publication 463 says, for example, "You can't deduct daily transportation costs between your home and temporary work sites within your metropolitan area. These are nondeductible commuting expenses." The full treatment is in commuting vs. business miles and temporary work location and commuting mileage.

The home-office exception, and its limit

The most valuable carve-out for a freelancer is this one, from Publication 463's "Office in the home" paragraph:

"If you have an office in your home that qualifies as a principal place of business, you can deduct your daily transportation costs between your home and another work location in the same trade or business."

With a qualifying home office, your home is a workplace, so home-to-client and client-to-home legs are workplace-to-workplace trips, and the direct-route cap applies to them just as it does between clients. Without a qualifying home office, they are commuting. Publication 463 sends you to Publication 587 for the principal-place-of-business test; see the home office mileage rule for how the two deductions interact.

Two cautions. First, "qualifies as a principal place of business" is a legal test, not a label: a desk in the bedroom where you check email does not automatically pass. Second, the quoted sentence says "in the same trade or business." Driving from your home office to a job in a different business of yours is not covered by that sentence.

Business Stop or Personal Stop? How to Sort Them

The cap applies when you do not go directly "for some personal reason." So the first question for every stop is whether the reason is personal.

Publication 463 does not list supply runs or bank deposits by name. The two-places sentence speaks of "workplaces," and the definition of transportation expenses speaks of the costs of getting from one workplace to another. Treating a genuine business errand as business travel is a judgment that practitioners commonly make, but it rests on facts, which is why the receipt and the one-line purpose matter more than the label. Commuting vs. business miles lists the common business errands that hold up.

A useful discipline: if you cannot write a business reason for the stop in a few words, it is personal.

How to Measure the Direct Route

The cap is only as good as the direct-route figure you use, and Publication 463 does not tell you how to produce it. A defensible method has three features.

1. Same start, same end, same time of day. Ask a mapping app for the route between the two workplaces for the time you actually drove. Traffic can change which route is fastest.
2. A reasonable route, not the most favourable one. If the sensible direct route is the highway, do not use a shorter surface-street route that nobody would take.
3. A note you wrote the same day. "A to B direct: 18 mi per map app" in the log entry is enough. A screenshot is better.

If the personal stop sits on the direct route and adds no miles, the direct-route figure equals the actual figure and nothing is subtracted. The cap bites only when the stop lengthens the drive.

One practical wrinkle: some GPS tools give a straight-line distance between points rather than the miles you drove. CentSense's trip form labels its automatic distance as estimated and straight-line and asks you to edit it if you know the actual distance, so treat any auto-filled figure as a draft and replace it with driven miles before you rely on it. See GPS mileage tracking apps and IRS compliance for how automatic tracking fits the substantiation rules.

Worked Example: Two Tuesdays at the Split 2026 Rates

A freelance designer has a home office that qualifies as her principal place of business and works for two clients in the same city. On two Tuesdays she follows the same route.

• Home to Client A: 12 miles
• Client A to Client B, directly: 18 miles
• Client B to home: 16 miles
• Her actual drive between A and B included a pharmacy stop: A to pharmacy 11 miles, pharmacy to B 14 miles, which is 25 miles instead of 18

The first Tuesday is June 23, 2026 (rate: 72.5 cents). The second is July 14, 2026 (rate: 76 cents). The 2026 rate is split by date, as recorded on the IRS standard mileage rates page: 72.5 cents per mile for January 1 through June 30 (IR-2025-128) and 76 cents per mile for July 1 through December 31 (IR-2026-29).

Values, computed by node -e from the figures above:

Three things this example is meant to show.

The deduction is not zero and not 53 miles. Claiming all 53 would overstate the day by 7 miles. Discarding the whole A-to-B drive would understate it by 18.

The rate follows the date. The same 46 miles are worth $33.35 on June 23 and $34.96 on July 14. A log that does not carry a date for every drive cannot be valued correctly in 2026. The 2026 mileage rate explains the split and which trips it affects.

The home office carries a lot of weight. If the same designer did not have a qualifying home office and had no temporary-work-location argument, the home-to-A and B-to-home legs would be commuting. Only the A-to-B direct leg would count: 18 miles, which is $13.05 on June 23 and $13.68 on July 14. The detour lost her the same 7 miles either way. The home office decided the other 28.

The example is arithmetic on a single day. It does not estimate the tax saved, which depends on your whole return.

What Your Log Has to Show

Publication 463 is specific about the elements. Its Table 5-1 row for transportation says you must keep records showing, for car expenses, "the cost of the car and any improvements, the date you started using it for business, the mileage for each business use, and the total miles for the year," plus "the date of the use of the car," "your business destination," and the business purpose of the expense. The regulation says the same thing for listed property: Treas. Reg. 1.274-5T(b)(6)(i)(B) calls for "The amount of each business/investment use ... based on the appropriate measure (i.e., mileage for automobiles and other means of transportation ...), and the total use of the listed property for the taxable period."

Two points matter for a day with a detour.

Estimates do not count

Publication 463 says it plainly: "You can't deduct amounts that you approximate or estimate." So "about 45 miles, some errands" is not a record. Each leg needs its own miles, and the personal stop should appear in the log as a personal entry or a note, not be buried inside a single round-number total.

Timing helps you more than perfection

The regulation does not demand a diary written in real time: "A contemporaneous log is not required, but a record of the elements of an expenditure or of a business use of listed property made at or near the time of the expenditure or use, supported by sufficient documentary evidence, has a high degree of credibility not present with respect to a statement prepared subsequent thereto when generally there is a lack of accurate recall."

Publication 463 gives a practical rule of thumb: "If you maintain a log on a weekly basis that accounts for use during the week, the log is considered a timely kept record." A weekly sit-down with your calendar and your odometer is enough; a reconstruction at tax time is the weakest form. For the full standard, see contemporaneous mileage log requirements and odometer readings and your mileage log.

A model entry for a detour day

The direct-route note is the line that protects you. It shows you saw the cap and applied it.

Standard Mileage Rate vs. Actual Expenses

The cap sentence in Publication 463 is not limited to one method. But the arithmetic differs.

Under the standard mileage rate, you multiply deductible miles by the rate for the date, and the personal miles simply do not appear. Publication 463 adds that "In addition to using the standard mileage rate, you can deduct any business-related parking fees and tolls." A toll paid only on the personal leg is not business related.

Under actual expenses, you divide the car's costs between business and personal use. Publication 463 says: "If you use your car for both business and personal purposes, you must divide your expenses between business and personal use. You can divide your expense based on the miles driven for each purpose." A reasonable reading is that direct-route miles count as business miles and the extra miles count as personal, so a detour nudges your business-use percentage down a little. Publication 463 does not work an example of the cap under actual expenses, so confirm that treatment with your preparer. The choice between methods is its own decision; see standard mileage vs. actual expenses and the business-use percentage.

Common Mistakes

1. Logging the whole day as one number. "Drove 53 miles for clients" hides the personal 7. It is also the weakest kind of record.
2. Treating the personal stop as proof the whole leg is lost. The cap says you can't deduct more than the direct cost, not that you can deduct nothing.
3. Claiming the detour because the destination was a client. The destination being business does not make the route business. Only the direct-route cost is deductible.
4. Assuming a home office makes every drive deductible. It makes home-to-work-location drives workplace trips, and the direct-route cap still applies. It must also be a principal place of business in the same trade or business.
5. Skipping the direct-route note. Without it, the 18 in the example is just a number you chose.
6. Using one rate for the whole year. In 2026, trips before July 1 and trips from July 1 are valued differently.
7. Trusting an auto-filled distance. Straight-line or estimated distances are not driven miles.
8. Writing the log at tax time. A weekly log is considered timely kept. A year-end reconstruction has the lack of accurate recall the regulation warns about.

How CentSense Helps

CentSense does not decide whether a stop is personal or compute the direct route for you, but it keeps the pieces of the record in one place:

• Dated trip entries (Solo plan). Each trip carries a date, distance, start and end address and notes, so every drive can be valued at the rate for its date.
• One trip per leg. Log the leg to the personal stop and the leg on to the next client as separate entries, and put the direct-route figure in the notes so the record shows what you deducted and why.
• GPS-assisted start. The Start Trip button records where you began; its distance is a straight-line estimate you should edit to the actual miles driven.
• Category per trip. Trips are categorised Business, Medical or Charity, so personal stops stay out of the business total.
• AI receipt scanning. Scan the receipt from the supply or bank stop that justifies a business errand, and save it as an expense; note the stop in the trip's Notes field so the two records point at each other. The free tier includes 10 AI scans a month.
• Schedule C categorisation for parking and tolls. Scanned parking and toll receipts can be categorised to Schedule C lines.
• CSV export (Solo plan). Export your mileage log for your preparer. Mileage tracking and the mileage CSV are Solo features; the free tier covers AI receipt scans.

One limit to know about: CentSense's mileage export applies a single annual rate per year and does not apply the July 1, 2026 split to each trip automatically. Value each trip at the rate for its date when you total the year, and confirm the figures with your preparer.

See also: Schedule C Line 9: car and truck expenses and Schedule C Part IV vehicle information.

Frequently Asked Questions

If I stop for a personal errand between two clients, do I lose the mileage deduction for the whole drive?

No. Publication 463's rule for working at two places in one day says: "If you work at two places in 1 day, whether or not for the same employer, you can deduct the expense of getting from one workplace to the other. However, if for some personal reason you don't go directly from one location to the other, you can't deduct more than the amount it would have cost you to go directly from the first location to the second." So the deduction for that leg is capped at the direct-route cost, and only the extra miles caused by the personal stop are lost. This applies to travel between two workplaces. It does not turn the personal stop itself into a business trip, and it does not change the rules for the drive from home to your first stop or from your last stop back home.

How do I calculate the deductible miles when a personal stop makes the route longer?

Log the miles you actually drove, then compute the miles of a direct trip from the first workplace to the second, and deduct the smaller of the two. If Client A to the pharmacy is 11 miles and the pharmacy to Client B is 14 miles, but A to B directly is 18 miles, the deductible leg is 18 miles and 7 miles are personal. Under the standard mileage rate you multiply the deductible miles by the rate for the date of the drive: 72.5 cents per mile for trips from January 1 through June 30, 2026 and 76 cents per mile from July 1, 2026. Publication 463 does not say how to measure the direct route, so use a consistent, reasonable method such as a mapping app's route for the same time of day and keep a note of it. If the personal stop lies on the direct route and adds no miles, there is nothing to subtract.

Can I deduct the drive from home to my first client if I also stop for a personal errand on the way?

Only if the drive would be deductible without the errand, and the errand still costs you the extra miles. Publication 463 says you can't deduct the cost of driving a car between your home and your main or regular place of work, which are personal commuting expenses, and that applies even if you work during the commuting trip. The exception that matters most to freelancers is the home office: "If you have an office in your home that qualifies as a principal place of business, you can deduct your daily transportation costs between your home and another work location in the same trade or business." Without a qualifying home office and without a temporary work location that fits Publication 463's rules, the home-to-first-client leg is commuting whether or not you make a personal stop. With a qualifying home office, the direct-route cap above still limits that leg if the personal stop lengthens it.

What if the stop is a business errand, like picking up supplies for the next client?

A genuine business stop is not a personal detour, so the legs on either side of it are business miles and the cap does not remove them. Publication 463 describes transportation expenses as including the ordinary and necessary costs of getting from one workplace to another in the course of your business, and of visiting clients or customers. It does not list supply runs or bank deposits by name, so keep the receipt and a one-line business purpose for the stop. If you combine a business purchase with a personal one at the same stop, treat the extra distance caused by the personal part as personal. A business stop does not change the commuting rule: if it sits between home and your first workplace and you have no qualifying home office or temporary work location, the drive from home is still commuting.

Does the direct-route cap work the same way if I deduct actual car expenses instead of the standard mileage rate?

Publication 463 states the two-places-of-work cap without limiting it to the standard mileage rate, but it does not walk through the actual-expense arithmetic. For actual expenses, Publication 463 says that if you use a car for both business and personal purposes you must divide your expenses between them, and that you can divide them based on the miles driven for each purpose. A reasonable reading is to count only the direct-route miles as business miles for the leg and the extra miles as personal, which lowers your business-use percentage slightly. Confirm that treatment with your preparer. If you use the standard mileage rate, Publication 463 says that in addition to the rate you can deduct business-related parking fees and tolls, and under actual expenses they are simply part of your costs, but a toll paid only on a personal detour is not business related.

What does my mileage log need to show for a day with a personal stop?

Publication 463's Table 5-1 says transportation records need, for car expenses, the mileage for each business use and the total miles for the year, the date of the use of the car, your business destination and the business purpose. Treas. Reg. 1.274-5T(b)(6)(i)(B) describes the amount element as the mileage of each business use plus the total use of the car for the period. Publication 463 also says you can't deduct amounts you approximate or estimate. A contemporaneous log is not required under Treas. Reg. 1.274-5T(c)(1), but a record made at or near the time of the use has a high degree of credibility that a later statement lacks, and Publication 463 treats a weekly log as timely. So log each leg with its date and miles, show the personal stop as its own personal entry or note, and record the direct-route figure you deducted.

Does a personal errand at the start or end of the day change anything?

Only in one situation. With a qualifying home office, a stop between your last client and home can lengthen the deductible last leg, and the direct-route cap limits that leg to the cost of going straight home. Without a qualifying home office, the drive from your last client to home is generally a nondeductible commuting trip and a personal stop does not change that. A personal stop between home and your first client is also generally commuting without a home office. In no case does an exception to the commuting rule make the personal stop itself deductible, and in no case does a stop erase business legs elsewhere in the day.

Authoritative References

• IRS Publication 463, Travel, Gift, and Car Expenses (2025 edition, the version verified for this guide): Transportation, "Two places of work," "Commuting expenses," "Office in the home"; Car Expenses, "Business and personal use"; chapter 5, Table 5-1
• IRS, Standard mileage rates (2026: 72.5 cents January 1 to June 30 per IR-2025-128; 76 cents July 1 to December 31 per IR-2026-29)
• 26 CFR 1.274-5T, Substantiation requirements, paragraphs (b)(6) and (c)(1) (Cornell LII)
• IRS Publication 587, Business Use of Your Home

Make the detour day a clean entry, not a guess. Start a free CentSense account, log each leg by date, keep the personal stop out of the business total, scan the receipt that proves a business errand, and export a preparer-ready mileage log. The free tier includes 10 AI receipt scans a month, no credit card required, and the Solo plan is $5/month for unlimited scans, mileage tracking and the mileage CSV export.

This guide is general education for U.S. self-employed taxpayers filing Schedule C for tax year 2026. It is not personalized tax advice. Whether a stop is personal or business, whether a home office qualifies as a principal place of business, and how the direct-route cap applies under the actual-expense method depend on your facts and are best confirmed with a CPA or EA. The worked example uses assumed distances for illustration.