California Per Diem Laws in 2026: What Employers and Employees Must Know
Most people have no idea how strict California’s per diem rules actually are. Seriously. But in California, employer per diem policies are heavily regulated, and getting them wrong can cost you big time. Let’s break down exactly what you need to know.
Whether you’re an employer setting up a travel policy or an employee trying to understand your reimbursement, this matters. California has some of the strongest worker protection laws in the country. Per diem is no exception.
What Is a Per Diem?
Here’s the simple version. Per diem is a daily allowance that employers give employees when they travel for work. It covers meals and other travel expenses. Instead of making employees submit receipts for every single meal, employers give a flat daily amount.
Think of it like this: your employer says, “We’ll give you $60 a day for meals while you’re on that business trip.” You get $60. You buy your meals. Done. No receipts needed.
The word “per diem” literally means “by the day” in Latin. Pretty straightforward, right?
Why California Has Special Per Diem Laws
Now, here’s where it gets interesting. California isn’t like other states. California protects workers more aggressively than most places do. That includes how employers handle per diem payments.
The state wants to make sure employers aren’t using per diem as an excuse to underpay workers. They also want to prevent employers from shifting costs that should be theirs onto employees. It’s a worker protection thing, and honestly, it makes sense.
The Basic Rules You Need to Know
California Treats Per Diem as Wages
Okay, pause. Read this carefully. California law classifies per diem payments as wages. This is huge. It means per diem isn’t just “reimbursement” like in other states. It’s considered part of your pay.
Why does this matter? Because wages in California are heavily regulated. Your employer has to follow strict rules about when they pay you, how much they pay you, and what deductions they can make.
Your Employer Must Cover Actual Expenses
Here’s the rule that surprises people. If an employee’s actual expenses exceed the per diem allowance, the employer must reimburse the difference. You can’t just cap it at per diem and say too bad.
Let’s say your employer gives you $50 per day for meals. You travel to San Francisco for a conference. Meals in San Francisco cost more. Your actual costs run $80 per day. Your employer owes you that extra $30.
This is probably the most important rule. Many employers don’t realize it.
Per Diem Must Comply with IRS Rates (Usually)
Most California employers use IRS per diem rates as their standard. The IRS sets per diem rates for different cities and regions. These rates are updated regularly, sometimes even monthly.
For 2025, the IRS federal per diem rate for most California areas is around $60-$80 per day for meals and incidental expenses. San Francisco, Los Angeles, and other high-cost cities have higher rates, typically $85-$120 or more.
Here’s the thing: California employers don’t have to use IRS rates. But most do. It’s the safest approach. Using IRS rates creates a strong legal protection for employers.
Wait, it gets better. If you use the IRS meal and incidental expense allowance (M&IE), you don’t need to keep meal receipts. The IRS considers that sufficient documentation. California generally accepts this too.
The Reasonable Allowance Test
Not sure what counts as reasonable? Let me break it down. California requires that per diem amounts be “reasonable.” What’s reasonable depends on the city and the circumstances.
If you’re traveling to a rural area where meals cost $15, a $100 per diem seems unreasonable. If you’re in downtown San Francisco where entrees cost $35+, a $50 per diem might not be reasonable.
Courts look at actual local costs when deciding if a per diem is reasonable. Employers need to research the area where employees are traveling and set per diem accordingly.
Pay Timing and Per Diem
Here’s where things get serious. California has strict rules about when employers must pay employees. This includes per diem payments.
Your employer must pay you for work-related travel expenses within your regular paycheck. They can’t withhold per diem until later. They can’t make you wait until the end of the month. It needs to be included on your next scheduled paycheck or in a separate check within reasonable time.
Some employers try to pay per diem late or hold it as “reimbursement” instead of wages. That’s a violation. California doesn’t allow this.
Advance Per Diem Payments
Many employers give per diem in advance before the trip. That’s totally fine. Actually, it’s better because it helps employees pay for expenses up front.
If your employer advances you per diem, they can’t deduct it from future paychecks without your written agreement. And even then, they can’t deduct more than the actual amount you received upfront. Anything left over is yours to keep.
This gets complicated when employees don’t spend all the per diem they received. Let’s talk about that next.
What Happens with Unused Per Diem?
Okay, this one’s important. Let’s say your employer gives you $200 for a three-day trip. You spend $180. What happens to the extra $20?
In California, employees generally get to keep unused per diem. Here’s why: once your employer gives you money for work-related expenses, it’s considered wages. They’ve paid you. The money is yours.
Some employers try to get employees to return unused per diem. Legally, they can require this only under specific conditions. And it gets messy.
The safest approach? Employers should calculate per diem based on actual expected expenses. If an employee genuinely spends less, they can return the excess. But employers can’t force this.
Deductions and Taxes on Per Diem
You might wonder about taxes. Here’s the deal. If per diem is paid according to the IRS accountable plan rules, it’s generally not taxable income. Your employer doesn’t report it on your W-2.
But California complicates this. California taxes income that federal government doesn’t tax. So even if IRS considers it tax-free, California might tax it.
This is why many California employers include per diem on W-2 forms. They’re being conservative. Better safe than dealing with tax issues later.
For employees, this means you might pay state income tax on per diem. Honestly, this is the confusing part. You might want to talk to a tax professional about your specific situation.
Special Circumstances and Recent Changes
Remote Work and Per Diem
With remote work becoming common, questions arise. Does an employee who works from home and occasionally travels for meetings get per diem? Yes, typically. The rules still apply when they’re traveling for work.
But permanent relocation is different. If you move to another state for a permanent job, that’s not per diem territory. That’s a different situation entirely.
Multi-Day Assignments and Long-Term Travel
What if you’re on a temporary assignment that lasts weeks or months? Is it still per diem, or does something else apply?
California gets tricky here. Generally, if the assignment is truly temporary and you’re expected to return home, per diem applies. If it becomes indefinite or permanent, it might not be per diem anymore. It might be a relocation situation instead.
The key question: Is this temporary travel, or is this becoming your new workplace? The answer matters legally.
Meals Provided by Employer
If your employer provides meals during travel, can they reduce the per diem? Yes, but there are rules. They can only reduce it by the actual cost of the meals provided. They can’t claim a higher reduction than what they actually spent.
Let’s say per diem is $60. Your employer provides breakfast worth $12. They can reduce the per diem to $48. Not less. Not to some random amount. To $48.
Travel to Your Usual Work Location
Here’s a gotcha. If you regularly travel to the same location for work, per diem gets complicated. The IRS and California consider this differently.
If you travel between two regular work locations, you might get per diem for the away location but not for your home location. The rules vary based on whether this is standard commuting or true travel for temporary work.
This one’s tricky. When in doubt, ask HR or a lawyer.
What Employers Must Do to Comply
Document Everything
Want to stay on the safe side? Document your per diem policy in writing. Make it clear. Make it specific. Include the daily amounts and how they were determined.
Keep records of where employees traveled and when. Keep records of per diem paid. If audited, you need evidence that you followed your own policy and that amounts were reasonable.
Use Updated IRS Rates
The IRS publishes per diem rates regularly. Some rates change monthly. Check the IRS website before sending employees on trips. Use current rates for the destination.
Actually, California employers should subscribe to IRS updates or check quarterly. Rates change. Old rates don’t cut it.
Create an Accountable Plan
This is technical, but important. An accountable plan is a written policy that ties per diem to actual business expenses. It has three parts: the business connection, the substantiation method, and the excess return policy.
If you have a proper accountable plan, per diem is typically not taxable federally. This protects both employers and employees. Small businesses sometimes skip this step. Don’t. It’s worth doing right.
Pay Timely and Accurately
Include per diem in paychecks on time. Don’t shortchange employees. Don’t make deductions they didn’t authorize. California wage and hour laws are strict about this. Violations lead to penalties and lawsuits.
What Employees Should Do
Know Your Rights
You’re not alone. Many employees don’t realize how protected they are under California law. Don’t accept unreasonable per diem amounts. Question policies that seem off.
If your employer doesn’t reimburse actual expenses above per diem, that’s a problem. Call them out. Document everything. Keep receipts even if they’re not required. You might need them later.
Request Reimbursement in Writing
If actual expenses exceed per diem, ask for reimbursement in writing. Email is perfect. Keeps a record. Don’t let it go. You’re legally entitled to it.
Track Your Expenses
Even though you might not need receipts for per diem, keep them anyway. Track where you traveled, when, and what you spent. This protects you if questions come up later.
If your employer challenges your per diem, you have proof. If there’s a lawsuit or audit, you have evidence. It only takes a few minutes per trip.
Understand Tax Implications
Talk to a tax professional about how per diem affects your taxes. If your employer is including per diem on your W-2, you’re paying taxes on it. You should understand this. You might have deduction options you don’t know about.
Common Per Diem Mistakes Employers Make
Mistake 1: Using Outdated or Low Rates
Many employers lock in a per diem rate and never update it. Boom. After a few years, the rate doesn’t match actual costs. This opens them to liability.
Update your rates annually. Check actual costs in the areas where employees travel. Adjust accordingly.
Mistake 2: Deducting Per Diem Improperly
Some employers deduct per diem from paychecks or require employees to pay it back later. This violates California wage law. Once you’ve paid it, it’s wages. You can’t claw it back.
Mistake 3: Not Reimbursing Excess Expenses
Your employee’s meal cost $85. Per diem was $60. You owe $25. Not paying this is wage theft in California. Seriously.
It’s a common mistake. It’s also expensive when you get caught.
Mistake 4: Mixing Per Diem with Salary
Don’t build per diem into someone’s salary without tracking it separately. California requires clear wage documentation. Mixing everything together creates confusion and legal risk.
Keep per diem separate. Pay it clearly. Document it. Your future self will thank you.
Penalties for Violations
What happens if you get this wrong? The consequences are serious.
If you’re an employer who doesn’t follow the rules, you could face wage and hour lawsuits. Penalties include unpaid wages, penalties for late payment, and damages. California also allows employees to sue for attorney’s fees.
One violation can grow into a class action lawsuit. Hundreds of employees claiming you underpaid them. That’s how these cases develop. It’s expensive and stressful.
If you’re an employee and your employer isn’t following the rules, you have rights. You can file a complaint with the Labor Commissioner. You can sue for unpaid wages. You can recover penalties.
California takes wage theft seriously. The state sides with workers.
Frequently Asked Questions
Can my employer require me to return unused per diem?
California law is murky here. Generally, your employer can ask for it back, but they can’t force it as a condition of employment. If they gave you the money as wages for work-related travel, it’s technically yours. That said, it’s better to cooperate and not create conflict. The safest practice is for employers to calculate per diem more accurately upfront.
Is per diem taxable in California?
It depends on your employer’s policy. If structured as an accountable plan using IRS rates, it’s typically not federal taxable income. California often taxes it anyway. Your employer should clarify on your W-2. If it’s included in wages, yes, you’re paying tax on it.
What if I travel to multiple cities during one trip?
You get the per diem for each city where you actually travel. If you drive through a small town but don’t stay there, you don’t get that city’s per diem. If you stay overnight, you do. The rule is where you actually spent time for business purposes.
Can my employer give a flat per diem regardless of location?
Not really. California requires that per diem be reasonable for the specific location. A flat $50 for everywhere isn’t reasonable. San Francisco costs more than rural areas. Your employer should adjust for location. If they don’t, you can ask for the difference.
What if my employer doesn’t have a per diem policy?
They still have to reimburse your actual work-related expenses. Without a policy, they have to pay what you actually spent, with receipts. Having a per diem policy is actually better for employers because they don’t need receipts. But if they don’t have one, you’re entitled to full reimbursement.
Final Thoughts
Now you know the basics. Per diem in California is more regulated than most places. Your employer has obligations. You have rights. Both sides need to understand the rules.
If you’re an employer, set up your per diem policy the right way. Use current IRS rates. Pay on time. Reimburse excess expenses. Document everything. It’s not complicated, but it matters.
If you’re an employee, know that California protects you. You’re entitled to reasonable per diem or full reimbursement of actual expenses. Don’t accept shortchanging. Keep records. Ask questions.
When in doubt, look it up or ask a lawyer. California wage and hour laws are your friend. Use them.
