California's 32 non-standard areas create one of the most complex per diem structures in the country, with FY 2026 daily allowances ranging from the $178 standard CONUS rate to $371 in Monterey during July and August. Seasonal lodging rates also vary substantially in several destinations, with South Lake Tahoe ranging from $141 to $247 per night, a $106 swing. Engine's travel policy controls let you set maximum nightly rates by location, turning per diem limits into hard-stop booking rules so employees only see compliant options.
Key Takeaways
- California has 32 GSA non-standard areas with location-specific rates, while all other counties default to the $178 standard CONUS rate
- FY 2026 rates remain unchanged from FY 2025, effective October 1, 2025 through September 30, 2026
- Monterey reaches California's highest FY 2026 combined GSA per diem at $371 per day in July and August, based on $279 lodging and $92 M&IE
- 14 of California's 32 non-standard areas have lodging rates that vary during the fiscal year, with South Lake Tahoe showing the largest swing, from $141 to $247 per night
- California Labor Code § 2802 requires private employers to reimburse all necessary business expenses, meaning per diem is a floor, not a ceiling
- The IRS high-low method offers a simplified alternative at $319/day for high-cost areas and $225/day for other locations
Understanding GSA Per Diem Rates for California in 2026
What Per Diem Covers
Per diem allowances split into two components: lodging and meals and incidental expenses (M&IE). The GSA lodging allowance covers the room rate only and excludes lodging taxes. For federal CONUS travel, eligible lodging taxes are reimbursed separately as a miscellaneous travel expense. M&IE covers breakfast, lunch, dinner, tips, and small fees like baggage handling. These components are always stated separately because lodging requires receipts while M&IE typically does not.
The General Services Administration sets per diem rates annually based on average daily rates at mid-priced hotels in each locality. For FY 2026, GSA Bulletin FTR 26-01 confirmed that rates remain unchanged from FY 2025 as part of broader cost efficiency initiatives.
How GSA Determines California's Non-Standard Areas
GSA designates locations as non-standard areas when lodging costs consistently exceed the standard CONUS rate. California's 32 NSAs reflect the state's high-cost urban centers, resort destinations, and seasonal tourism markets. Each NSA is defined by county boundaries, city limits, or both.
Key distinctions to understand:
- Standard CONUS rate: $110 lodging + $68 M&IE = $178/day for all locations not designated as NSAs
- Non-standard areas: Custom rates reflecting local market conditions, ranging from $200 to $364 per day in California
- Seasonal variation: 15 of California's 32 NSAs adjust rates monthly based on tourism patterns
For teams managing frequent California travel, Engine's dashboards and reporting provide real-time visibility into spend by location, making it easy to track adherence to per diem limits across departments.
California's 32 Non-Standard Areas: A Regional Breakdown
Bay Area and Peninsula: The Highest Rates
The San Francisco Bay Area commands California's highest per diem allowances, reflecting some of the most expensive hotel markets in the country.
San Francisco (San Francisco County)
- Lodging: $259 to $272 seasonally
- M&IE: $92/day (highest tier)
- Total daily rate: $351 to $364
- Peak months: October through December, September
Santa Monica (City limits only)
- Lodging: $273 year-round
- M&IE: $92/day
- Total daily rate: $365
- Note: Separate rate from greater Los Angeles
Sunnyvale/Palo Alto/San Jose (Santa Clara County)
- Lodging: $192 year-round
- M&IE: $92/day
- Total daily rate: $284
San Mateo/Foster City (San Mateo County)
- Lodging: $183 year-round
- M&IE: $86/day
- Total daily rate: $269
Oakland/Alameda (Alameda County)
- Lodging: $145 year-round
- M&IE: $92/day
- Total daily rate: $237
- Note: $127/day savings compared to San Francisco
According to GSA data, these Bay Area rates represent the highest concentration of premium per diem allowances in California.
Southern California Markets
Los Angeles area rates cover a vast geographic region but remain consistent year-round, simplifying budget planning.
Los Angeles (Los Angeles, Orange, Ventura counties, excluding Santa Monica)
- Lodging: $191 year-round
- M&IE: $86/day
- Total daily rate: $277
- Note: Designated as a high-cost area by the IRS for the high-low method
San Diego (San Diego County)
- Lodging: $199 to $237 seasonally
- M&IE: $86/day
- Total daily rate: $285 to $323
- Peak months: June through August
Palm Springs (Riverside County)
- Lodging: $141 to $186 seasonally
- M&IE: $86/day
- Total daily rate: $227 to $272
- Note: Inverse seasonal pattern with higher rates October through May
Central California, Coastal, and Mountain Regions
Resort and tourism destinations show the most dramatic seasonal variations, as reflected in GSA seasonal rate schedules.
Monterey (Monterey County)
- Lodging: $191 to $279 seasonally
- M&IE: $92/day
- Total daily rate: $283 to $371
- Seasonal swing: $88 between winter and summer
Napa (Napa County)
- Lodging: $172 to $246 seasonally
- M&IE: $92/day
- Total daily rate: $264 to $338
- Peak months: September and October (harvest season)
Lake Tahoe Area
GSA uses separate FY 2026 localities rather than one Lake Tahoe rate:
- South Lake Tahoe (El Dorado County): $141 to $247 lodging + $86 M&IE, for totals of $227 to $333
- Tahoe City (Placer County): $131 lodging + $86 M&IE, for a $217 total
- Truckee (Nevada County): $142 to $173 lodging + $86 M&IE, for totals of $228 to $259
Mammoth Lakes in Mono County has its own separate GSA locality and should not be included under a single Lake Tahoe rate.
Sacramento (Sacramento County)
- Lodging: $149 year-round
- M&IE: $86/day
- Total daily rate: $235
For a complete breakdown of rates by state, see Engine's guide to per diem rates.
M&IE Breakdown and the 75% First/Last Day Rule
California's M&IE Rates
California locations use five GSA M&IE rates for FY 2026 according to GSA per diem rates:
$92 M&IE
- Daily Rate: $92
- First/Last Day (75%): $69.00
- California Locations: Mill Valley/San Rafael/Novato, Monterey, Napa, Oakland, San Francisco, Santa Barbara, Santa Monica, Sunnyvale/Palo Alto/San Jose
$86 M&IE
- Daily Rate: $86
- First/Last Day (75%): $64.50
- California Locations: Includes Los Angeles, San Diego, Sacramento, Palm Springs, San Mateo/Foster City/Belmont, South Lake Tahoe, and several other California NSAs
$80 M&IE
- Daily Rate: $80
- First/Last Day (75%): $60.00
- California Locations: Death Valley, Oakhurst, Visalia, West Sacramento/Davis
$74 M&IE
- Daily Rate: $74
- First/Last Day (75%): $55.50
- California Locations: Bakersfield/Ridgecrest, Stockton
$68 Standard M&IE
- Daily Rate: $68
- First/Last Day (75%): $51.00
- California Locations: California locations without a specified non-standard rate
How M&IE Allocates Across Meals
For San Francisco's $92 M&IE rate:
- Breakfast: $23
- Lunch: $26
- Dinner: $38
- Incidentals: $5
On travel days (first and last day of a trip), employees receive 75% of the applicable M&IE rate. A San Francisco trip starting and ending on the same day would allow $69 for M&IE rather than the full $92.
For expense tracking aligned with these allocations, Engine's expense report template provides a ready-to-use format that matches per diem categories.
Seasonal Rate Variations That Impact Your Budget
Selected FY 2026 Seasonal Lodging Rates
- Monterey: $279 in July and August; $191 to $199 during the rest of the fiscal year
- San Diego: $237 in June and July; $199 during all other months
- South Lake Tahoe: $247 from December through March, $171 from June through August, and $141 to $143 during the remaining months
- Yosemite National Park: $203 from January through April and $181 during the rest of the fiscal year
- Santa Barbara: $262 in July and August and $205 during all other months
- San Luis Obispo: $203 in June and July and $163 during all other months
- San Francisco: $272 from September through December and $259 from January through August
- Napa: $246 from February through November except December and January, when the rate is $172
Best Value Months for California Business Travel
January through May offers the lowest rates in most markets, with these exceptions:
- Palm Springs peaks October through May (desert resort inverse pattern)
- Mammoth Lakes peaks during ski season (December through March)
- Lake Tahoe maintains elevated rates for winter sports
Planning travel during off-peak months can save significant budget. A Monterey trip in February at $191/night vs. July at $279/night saves $88 per room night before M&IE.
California Labor Code § 2802: What Sets California Apart
Per Diem as a Floor, Not a Ceiling
Unlike federal employees bound strictly to GSA rates, California private employers face additional obligations under Labor Code Section 2802. The statute requires employers to reimburse employees for "all necessary expenditures" incurred in performing their job duties.
California Labor Code 2802 requires covered employers to fully reimburse employees for necessary and reasonable expenses incurred in performing their duties. GSA per diem rates are not a statutory floor or ceiling for private-sector reimbursement. Employers may use a fixed allowance or similar reimbursement method, but the amount must be sufficient to cover the employee's necessary reimbursable expenses.
Key compliance points:
- Reasonableness standard: Expenses must be necessary and reasonable, but luxury costs are not covered
- Documentation required: Receipts for lodging and expenses over $75
- Attorney fees provision: Employees can recover legal fees if they sue to enforce § 2802
- Public employer exemption: Per a 2024 Court of Appeal ruling, § 2802 applies to private employers only
Compliance Best Practices for California Employers
To stay compliant while controlling costs:
- Use GSA rates as a baseline budget, not a maximum reimbursement cap
- Create a written policy allowing actual expense claims when per diem proves insufficient
- Require receipts for costs exceeding per diem amounts
- Process reimbursements within 30 days
- Never deduct unreimbursed travel expenses from wages
Engine's corporate travel template includes California-specific language addressing § 2802 requirements.
The IRS High-Low Method Alternative
For companies with travel across many California cities, the IRS high-low method offers a simplified alternative to tracking city-specific GSA rates.
- High-cost areas: $319/day (FY 2026), M&IE portion: $86
- All other areas: $225/day (FY 2026), M&IE portion: $74
- Incidentals only: $5/day (FY 2026), M&IE portion: N/A
California localities designated as high-cost under the IRS high-low method for all or part of the 2025–2026 period include:
- Los Angeles: October 1–September 30
- Mammoth Lakes: December 1–March 31
- Monterey: October 1–September 30
- Napa: October 1–November 30 and February 1–September 30
- Palm Springs: October 1–April 30
- San Diego: October 1–September 30
- San Francisco: October 1–September 30
- San Luis Obispo: June 1–July 31
- Santa Barbara: October 1–September 30
- Santa Monica: October 1–September 30
- South Lake Tahoe: December 1–March 31
- Sunnyvale/Palo Alto/San Jose: October 1–September 30
- Yosemite National Park: January 1–April 30
Once you choose the high-low method for an employee, you must use it for all their CONUS travel that calendar year. You cannot mix the high-low method with GSA locality rates for the same employee.
Why Engine for California Business Travel
Managing per diem compliance across 32 California localities with seasonal variations requires more than spreadsheets. Engine's platform addresses the specific challenges of California business travel.
- Travel policies that enforce themselves. Set maximum nightly rates by city or county to match GSA per diem limits. Out-of-policy options never appear in search results, eliminating post-booking audits and awkward reimbursement conversations.
- Consolidated billing with DirectBill. DirectBill simplifies billing and per diem reconciliation. Engine extends a line of credit, Engine pays the hotels, and the customer receives one consolidated invoice after stays.
- Real-time spend visibility. Dashboards track spend by location, department, and project, making it easy to identify when teams are consistently exceeding per diem rates in specific markets.
- Protection when plans change. FlexPro provides cancellation coverage for hotel bookings. FlexPro is a paid subscription covering all company hotel bookings with cancellation until noon on check-in day, including non-refundable rates. The default refund is Engine travel credit valid for one year. FlexPro costs $299 per month or $2,999 per year.
- 1,000,000+ properties including rural California. Engine's network covers remote locations near job sites, hospitals, and event venues where finding lodging within per diem rates can be challenging.
No platform fees, no membership fees, no agent-assist fees, no contracts, no minimum spend. The booking platform is free to use. Sign up and start booking within minutes.
Frequently Asked Questions
Are lodging taxes included in the GSA per diem lodging rate?
No. The GSA lodging rate covers the room charge only. Taxes are reimbursed separately as a miscellaneous expense. When budgeting for California travel, add approximately 12% to 15% to the lodging per diem to account for state and local transient occupancy taxes, which vary by city.
Can employees keep unused per diem funds?
It depends on your company's policy and the reimbursement method. Under a qualifying accountable-plan per diem arrangement, employees generally do not have to return the portion of the allowance associated with properly substantiated travel days simply because their actual spending was lower. Employees must substantiate the time, place, and business purpose of the travel, while unsubstantiated amounts generally must be returned. Under a non-accountable plan, employees may keep excess funds, but the full per diem amount becomes taxable income. Most companies use accountable plans to avoid the tax complications.
How do I determine which per diem rate applies when traveling between two California cities?
For federal travel, the applicable GSA rate is generally based on the location of the temporary-duty work activities, not the location of the hotel. If lodging is unavailable at the temporary-duty location, an agency may authorize the rate for the location where lodging is obtained. If traveling from San Francisco to Sacramento and staying overnight in Sacramento, the Sacramento rate ($235/day) applies for that day's lodging, not the San Francisco rate ($364/day). For meals, use the rate for the location where the meal is consumed.
When will FY 2027 California per diem rates be announced?
GSA typically announces new fiscal year rates in mid-August, with rates taking effect October 1. GSA announced FY 2027 CONUS per diem rates on August 18, 2026. The new rates apply to travel from October 1, 2026 through September 30, 2027. Check the GSA per diem lookup for updates.
What documentation do California employers need to maintain for per diem reimbursements?
Under California Labor Code § 2802 and IRS guidelines, maintain records showing: specific travel dates, business purpose of the trip, location of business activity, and receipts for lodging (required) and expenses over $75 (recommended). Keep these records for at least four years to satisfy both state labor law and IRS audit requirements.
