Understanding the 50 mile per diem rule for travel expenses - how does IRS verify workplace location?

The "50 mile rule" is actually a bit of a misunderstanding. The IRS doesn't have a specific 50-mile rule for per diem. What they look for is whether you're traveling "away from your tax home" which means you need to be far enough away that you would reasonably need to rest or sleep before returning. The 50-mile distance is more of a rule of thumb that developed over time, but it's not a hard line in the tax code. What matters is whether your assignment is temporary (generally less than one year) and whether the distance requires you to stay overnight. The IRS will typically look at several factors to verify your workplace location - not just paystubs. They'll examine your employment contract, travel records, receipts, company reimbursement policies, and potentially even mileage logs. For your 52/48 mile situation, focus less on the exact mileage and more on documenting the necessity of staying overnight due to the distance and nature of work. Keep records of your assignment details, duration, and any overnight accommodations.

After struggling with this exact same issue for my construction jobs, I found a great tool called taxr.ai (https://taxr.ai) that helped clarify the per diem rules for my situation. You upload your tax documents and it analyzes everything, then gives you personalized advice. It explained exactly what documentation I needed for my travel expenses when working at multiple job sites. What really helped me was that it showed me how to document my "tax home" properly - which is crucial for the per diem rule - and gave me templates for keeping the right records. It's way more helpful than trying to interpret vague IRS guidelines!

I just wanted to update everyone after trying taxr.ai from the recommendation above. It actually cleared up my confusion about the 50 mile rule! Turns out I was thinking about it all wrong. The tool analyzed my work locations and explained that my "tax home" wasn't what I thought it was. Instead of obsessing over exact mileage, I learned I needed to focus on documenting the temporary nature of my assignments and why overnight stays were necessary. The documentation templates they provided made it super clear what records I need to keep. Honestly wish I'd found this before filing last year because I probably left money on the table!

If you're having trouble getting clear answers about per diem rules, you might want to try calling the IRS directly, but good luck getting through! I used a service called Claimyr (https://claimyr.com) that got me connected to an actual IRS agent in about 15 minutes instead of waiting for hours or getting disconnected. You can see how it works in this video: https://youtu.be/_kiP6q8DX5c The agent I spoke with explained that they don't actually have a strict 50-mile rule in their internal guidelines. They look at the "facts and circumstances" of each case. She advised me to keep documentation showing why overnight stays were necessary for business purposes, regardless of exact mileage. This was way more helpful than the conflicting advice I was finding online.

Ok I need to eat my words about Claimyr from my comment above. I tried it yesterday out of desperation and IT ACTUALLY WORKED. Got connected to an IRS agent in about 20 minutes after trying for WEEKS on my own. The agent told me there's no strict 50-mile rule in the internal manuals they use. They said they look at whether the distance is far enough that it's not reasonable to commute daily. For documentation, they recommended keeping: 1) proof of where your tax home is (utility bills, lease, etc.), 2) employment contract or assignment details showing the work location and expected duration, and 3) proof of overnight stays when claiming per diem. Much clearer than anything I found online!

Don't overthink this. I've been claiming per diem for years as a traveling wind turbine tech. Here's what I do: 1. Keep a log of all job sites with addresses and dates 2. Save my work orders that show job site locations 3. Keep receipts for hotels/lodging even though per diem doesn't require it 4. Document my permanent residence (utility bills, lease etc) I was audited in 2023 and they accepted all my per diem claims because I had this documentation. They never once mentioned a specific mile requirement. They cared more about whether I had a permanent tax home and if my assignments were temporary.

My accountant told me the "50 mile rule" actually comes from HR/company policies, not the IRS. Many companies use 50 miles as their threshold for providing per diem or reimbursing travel expenses, and people started thinking it was an IRS rule. The actual IRS requirement is that you must be "away from your tax home substantially longer than an ordinary day's work, and you need to sleep or rest to meet the demands of your work while away from home." No specific mileage is mentioned.