Bookkeeping for Trucking Owner-Operators in California: IFTA, Per Diem, and AB5

Running a truck as an independent owner-operator in California puts you in a category that most bookkeeping guides skip entirely. You are not a trucking company with a fleet and a dispatcher. You are not a port drayage driver working a terminal gate. You own your truck or lease it under a purchase agreement, you haul freight under your own authority or leased to a motor carrier, and you absorb every cost from fuel to tires to quarterly tax payments out of your own settlement checks. The financial complexity that comes with that position, including IFTA filing, the per diem deduction, AB5 classification risk, multi-state depreciation differences, and the California FTB's non-standard estimated tax schedule, is genuinely hard to manage without books that are set up correctly for it.

This guide is written specifically for independent trucking owner-operators in SE Los Angeles and the broader California market. If you haul port-related freight out of Long Beach or San Pedro, see our related guide on trucking bookkeeping for Los Angeles port and drayage operators. The present article covers owner-operators beyond the port context: interstate haulers, regional flatbed and refrigerated operators, hotshot carriers, and solo operators leased to carriers who do not fit the drayage mold.

Why Trucking Owner-Operator Bookkeeping Is Different in California

A California owner-operator who runs loads across state lines deals with a set of financial obligations that a general small business bookkeeper will not know to look for. Several of them carry penalties if missed, and some of the most valuable deductions available to truckers are also the most commonly overlooked.

IFTA adds a quarterly compliance layer. If you cross into other states, you are required to hold an IFTA license and file quarterly returns reporting how many miles you drove in each jurisdiction and how much fuel you purchased in each. That data has to come from somewhere, which means trip logs and fuel receipts organized by state, tracked every run, not reconstructed at quarter-end from memory.

The per diem deduction is real money and is regularly missed. Transportation workers who spend nights away from home qualify for a standard IRS per diem deduction on meal and incidental expenses. The IRS limits transportation workers to 80 percent of the applicable rate, but on 200 or more nights per year away from home, that deduction is one of the largest available to a sole-proprietor trucker. Most owner-operators who handle their own books do not claim it at all because they do not know it exists or do not keep the required log.

California does not conform to federal depreciation rules. When you buy a truck, the federal and California tax treatment of that asset diverges immediately. Federal law allows bonus depreciation; California does not. Tracking a truck correctly requires maintaining two sets of depreciation schedules and reconciling them every year, which most off-the-shelf bookkeeping setups do not handle without a manual adjustment.

AB5 creates classification risk that affects how you structure your business. California's AB5 law has specific and contested implications for owner-operators who lease exclusively to one carrier. The legal landscape is evolving, and your bookkeeping records are part of the factual record that supports or undermines your classification.

These four issues interact with each other and with your quarterly estimated tax obligations in ways that compound the complexity. The sections below address each one directly.

IFTA Filing for California-Based Owner-Operators

The International Fuel Tax Agreement (IFTA) is a compact among the lower 48 U.S. states and 10 Canadian provinces that simplifies fuel tax reporting for commercial vehicles operating across jurisdictions. Rather than filing separate fuel tax returns in every state you enter, you file one quarterly return with your base jurisdiction, and IFTA redistributes the taxes to each state based on the miles you drove there.

Who needs an IFTA license. You need an IFTA license if you operate a qualified motor vehicle across two or more IFTA member jurisdictions. A qualified motor vehicle is generally a vehicle with a gross vehicle weight rating over 26,000 pounds, or a vehicle with three or more axles regardless of weight. If you drive only within California and never cross into Nevada, Arizona, Oregon, or any other state, IFTA does not apply to you. The moment you regularly cross state lines under your own authority or as a leased operator, you need to be IFTA compliant.

California IFTA returns are filed with the CA DMV. California's base state for IFTA is the Department of Motor Vehicles, not the DMV's typical vehicle registration office. IFTA returns are filed quarterly: Q1 (January through March) is due April 30, Q2 (April through June) is due July 31, Q3 (July through September) is due October 31, and Q4 (October through December) is due January 31. Missing a quarterly filing triggers a penalty of $50 or 10 percent of the net tax due, whichever is greater, plus interest on the unpaid balance.

What IFTA requires you to document on every trip. For each trip in a qualified motor vehicle, your records must capture: the date of the trip, the origin and destination, the route traveled, the total miles driven and the miles driven in each state, and the fuel purchased in each state with the date, location, and gallons on the receipt. This is not documentation you can reconstruct after the fact with any reliability. It needs to be kept trip by trip, run by run. A bookkeeper who works with truckers builds these logs into your monthly routine and reconciles the state-by-state data before each quarterly filing so you are not racing to produce records on the due date.

Leased operators and IFTA. If you are leased to a motor carrier and operate under the carrier's authority and IFTA license, the carrier is typically responsible for filing the IFTA return. Confirm this in writing with your carrier. If you hold your own authority, you hold your own IFTA license and file your own return regardless of leasing arrangements. Knowing which situation applies to you is important because an unfiled return is your liability, not your carrier's, if you were the license holder.

The Per Diem Deduction: The Most Commonly Missed Trucking Deduction

Federal tax law allows transportation workers to deduct a standard meal and incidental expense (M&IE) per diem rate for each night they are away from home for business. For owner-operators who file Schedule C, this deduction runs directly against self-employment income. At 200 or more nights per year away from home, the aggregate deduction is substantial. Despite that, it is one of the most frequently unclaimed deductions in trucking because many owner-operators who manage their own books do not know the rule exists, or they know it exists but do not keep the required log.

The 80 percent limitation for transportation workers. The IRS limits transportation workers to deducting 80 percent of the applicable M&IE rate, not the full rate. This is a statutory limitation that applies specifically to individuals subject to U.S. Department of Transportation hours-of-service rules, which includes most commercial truckers. The limitation means you cannot deduct 100 percent of the per diem, but 80 percent of a rate applied over many nights is still a meaningful number.

Current rate: confirm before filing. The IRS sets the CONUS transportation worker M&IE rate annually. For 2025 and 2026, the standard M&IE rate for transportation workers has been approximately $80 per day, making the deductible amount approximately $64 per day after the 80 percent limitation. Confirm the current rate at IRS.gov or with your CPA before filing your return. The rate is adjusted periodically and the figure above should not be used as a substitute for verifying the current published rate.

What you need to document. The IRS requires a contemporaneous log of nights away from home to substantiate the per diem deduction. "Contemporaneous" means recorded at the time, not reconstructed weeks later. The log should capture the date you left home, the date you returned, the destination or general area of travel, and the business purpose of the trip. A simple spreadsheet, a paper log, or a notes entry in your phone at the end of each away-from-home night satisfies this requirement. Your bookkeeper records the deduction on your Schedule C based on the log you provide. Without the log, the deduction is at risk on audit.

This is not just a tax-time issue. The per diem log is part of your year-round recordkeeping, not something to think about in March. A bookkeeper who works with truckers will remind you to keep the log current, will reconcile it against your settlement records periodically, and will make sure the deduction is claimed correctly rather than left on the table.

Fuel Costs, Receipts, and the IRS Fuel Tax Credit

Fuel is the largest single operating expense for most owner-operators. Keeping fuel costs organized matters both for your income statement and for two specific tax benefits: IFTA filing accuracy and the federal fuel tax credit.

Keep receipts organized by state. Every fuel purchase needs to be recorded with the date, the state, the gallons purchased, and the price per gallon. This is the source data for your IFTA return. A receipt you cannot locate or a fill-up you forgot to record creates an error in your IFTA return that the DMV may flag on audit. The practical system most truckers use is a folder on their phone or a physical receipt envelope organized by quarter. Your bookkeeper reconciles those receipts against your fuel card statements or bank records monthly.

Fuel surcharges are income. Many carriers and brokers pay a separate fuel surcharge line on settlement statements. That amount is taxable income regardless of what it is called. A settlement statement that shows $2,400 in linehaul revenue and $400 in fuel surcharge means $2,800 in gross income for that load. Owner-operators who record only the linehaul line are underreporting income. Your bookkeeper reconciles settlement statements against your books monthly to ensure every income line is captured.

The IRS Form 4136 fuel tax credit. The federal government imposes an excise tax on diesel fuel at a rate of 24.4 cents per gallon (confirm the current rate with your CPA, as Congress can adjust excise tax rates). Owner-operators who pay federal diesel excise tax on fuel used for qualified commercial highway transportation purposes may be eligible to claim a credit for that excise tax on IRS Form 4136, Credit for Federal Tax Paid on Fuels, filed with their federal income tax return. This is a credit against tax owed, not a deduction against income, which makes it more valuable dollar for dollar than a deduction. Eligibility depends on how the fuel is used and whether the excise tax was actually included in what you paid at the pump. Confirm eligibility and the current excise tax rate with your CPA before claiming this credit.

AB5 and Owner-Operator Classification Risk in California

California's AB5 law, effective January 1, 2020, changed how the state determines whether a worker is an employee or an independent contractor. Its application to trucking has been one of the most contested legal battles in California labor law since the bill was signed.

What happened with AB5 and trucking. The trucking industry sought a federal preemption exemption under the Federal Aviation Administration Authorization Act (FAAAA), arguing that California could not apply its own worker classification standards to motor carriers. That argument ultimately failed in the federal courts, and the California Supreme Court confirmed that AB5 applies to port and drayage truckers. Prop 22, which created a carve-out for app-based gig economy workers in other industries, did not create an exemption for traditional trucking owner-operators.

What the ABC test means for owner-operators. AB5 uses the ABC test: a worker is presumed an employee unless the hiring entity can satisfy all three parts. For an owner-operator leased to a motor carrier:

• Part A asks whether the worker is free from the control and direction of the carrier, both in the contract and in fact. If the carrier sets your routes, schedule, and pick-up windows, Part A is difficult to satisfy.
• Part B asks whether the work is outside the usual course of the carrier's business. Hauling freight for a freight carrier is squarely within the carrier's usual business. Part B is almost always a failing grade for trucking.
• Part C asks whether the worker is customarily engaged in an independently established trade or business. An owner-operator with their own authority, their own operating permits, their own clients beyond one carrier, and their own business infrastructure has a stronger argument here than someone whose entire book of business is one motor carrier's dispatch board.

The practical risk for California owner-operators. If you lease your truck exclusively to one motor carrier, accept all loads the carrier dispatches to you, and have no other authority, no other shippers or brokers you work with directly, and no independent business identity beyond that carrier relationship, California may classify you as the carrier's employee. That classification has real financial consequences: the carrier may owe back payroll taxes and benefits, and you may have a wage claim. As of 2026, this is an active and evolving area of litigation and enforcement. Do not restructure your business, add or drop authorities, or change how you operate in response to AB5 without first consulting a California employment or transportation attorney. J.P Bookkeeping's role is keeping your books accurate; the legal determination requires an attorney.

What your bookkeeping records reflect. If you operate under your own authority, your books should show income from multiple brokers or shippers, your own operating expenses paid directly by you, and a business structure that is consistent with an independently established business. These records are part of the factual record in any classification dispute. If your books show all income from a single carrier, no independent operating expenses, and no evidence of a separately run business, the records themselves are evidence in the wrong direction.

Truck Depreciation: Federal vs. California Rules

Your truck is likely the largest capital asset in your business. How you depreciate it affects both your federal and California taxable income, and the two do not follow the same rules.

Section 179 first-year expensing. Section 179 of the Internal Revenue Code allows a business to deduct the full purchase price of qualifying property in the year it is placed in service, up to the annual limit. The Section 179 limit is adjusted annually; confirm the current limit with your CPA before filing. A commercial truck used for business qualifies. California conforms to Section 179 with its own separate limit, which has historically been lower than the federal limit. Your bookkeeper records the truck as a fixed asset, notes the in-service date, and tracks whether you elected Section 179 so the records match both your federal and California returns.

Bonus depreciation: federal yes, California no. Federal law has allowed bonus depreciation as an additional first-year deduction on top of Section 179. For 2026, the federal bonus depreciation rate is 20 percent of the qualifying asset's cost basis after Section 179 (the rate was 100 percent in prior years and has been phasing down). California does not conform to federal bonus depreciation at all. This means your federal taxable income and your California taxable income will diverge in the year you place a truck into service, and they will continue to diverge each year as the depreciation schedules run at different rates. Your bookkeeper needs to maintain both a federal depreciation schedule and a California depreciation schedule for each vehicle and reconcile them annually so your California Franchise Tax Board return reflects the correct California income, separate from the federal figure.

MACRS depreciation for trucks. If you do not elect Section 179 or bonus depreciation for the full cost, trucks are generally depreciated over five years under MACRS (Modified Accelerated Cost Recovery System) for federal purposes. The half-year convention applies in most cases. California uses its own MACRS-based schedule without the bonus depreciation overlay. Trailer and equipment depreciation follows similar rules with different recovery periods. Keep the in-service date for every piece of equipment, including trailers, straps, and load securement gear, so the depreciation record is complete.

For more detail on how California's nonconformity with federal depreciation rules affects contractor and owner-operator tax returns, see our guide on bookkeeping costs for small businesses, which covers what these compliance tasks actually cost to manage correctly.

Quarterly Estimated Taxes for Owner-Operators

As a sole proprietor or single-member LLC owner-operator, you have no employer withholding taxes from your pay. You are responsible for paying your own federal and California income tax, plus self-employment tax, in quarterly estimated installments. Missing or underpaying these installments results in underpayment penalties from both the IRS and the California Franchise Tax Board.

Federal estimated tax due dates. The IRS quarterly estimated tax payments are due April 15 (Q1), June 16 (Q2, adjusted when the 15th falls on a weekend or holiday), September 15 (Q3), and January 15 of the following year (Q4). If you miss a payment or pay less than required, the IRS charges an underpayment penalty calculated on the shortfall for each quarter separately.

California FTB estimated tax due dates: different from federal. California does not follow the federal schedule. The California FTB requires 30 percent of your estimated tax by April 15, 40 percent by June 15, nothing in September, and 30 percent by January 15. This front-loading means California expects 70 percent of your estimated tax paid by mid-June, well ahead of the federal schedule. Owner-operators who budget for estimated taxes using the federal schedule often find themselves short on the June California payment.

Variable income makes estimation harder for truckers. A trucker's income is not uniform across quarters. Slow months from equipment repairs, weather, load availability, or contract gaps can reduce Q1 income significantly, then Q3 or Q4 income spikes when rates improve. An owner-operator who estimates the full year's tax based on a strong first quarter will overpay early and have less working capital when they need it. One who estimates based on a slow start may underpay and face penalties in a strong year. A bookkeeper who closes your books each month can project estimated income for the current quarter based on actual data, which is more accurate than annualizing any single period's performance. That accuracy reduces both underpayment penalties and unnecessary overpayment.

Self-employment tax. As a sole proprietor, you pay both the employee and employer halves of Social Security and Medicare tax, collectively the self-employment tax. The deductible half of self-employment tax (the employer-equivalent portion) reduces your federal adjusted gross income. Your bookkeeper calculates this as part of your quarterly estimated tax projection so the estimate accounts for the full self-employment tax obligation, not just income tax.

When a Trucking Owner-Operator Needs a Bookkeeper

Not every owner-operator needs a full-service bookkeeper on day one. But certain conditions make professional bookkeeping genuinely cost-effective, because the mistakes that accumulate without it carry real dollar penalties and missed deductions that often exceed what a bookkeeper costs.

• You are filing IFTA returns. IFTA filing requires organized, trip-by-trip mileage and fuel data maintained throughout the quarter. Reconstructing it at the deadline is error-prone. A bookkeeper who tracks this data monthly produces a cleaner IFTA return with less risk of a CA DMV audit.
• You operate in multiple states. Multi-state operations mean multi-state income potentially allocated across jurisdictions, a fuel log that has to be reconciled by state, and depreciation schedules that diverge between federal and California. This complexity is manageable with the right setup; it compounds quickly without one.
• You have more than one truck. A second truck means a second IFTA vehicle, a second depreciation schedule, potentially a second driver on payroll, and a significantly higher volume of fuel receipts and settlement statements to reconcile. For California payroll obligations if you have hired drivers, see our California payroll bookkeeping guide.
• You are claiming per diem deductions. The per diem deduction is legitimate and valuable, but it requires a contemporaneous log and correct calculation of the 80 percent limitation. A bookkeeper ensures the deduction is claimed correctly so it holds up if the IRS asks questions.
• Your books are two or more months behind. Behind books mean you are missing the monthly data that drives accurate IFTA returns and quarterly estimated tax projections. Getting current requires a catch-up process before you can run the business forward correctly. For more on what that looks like, see our catch-up bookkeeping guide.
• You are managing quarterly estimated taxes on variable income. If you have underpaid and received IRS or FTB penalty notices, or if you are unsure whether you are on track each quarter, a bookkeeper who closes the books monthly can project the current quarter's liability with actual data rather than guesswork.

If your books are behind, you are not claiming the per diem, and you are filing IFTA returns from memory, the combined cost of penalties, missed deductions, and IFTA errors is almost always higher than the cost of keeping books correctly. See our guide on bookkeeping costs for small businesses for a realistic picture of what professional bookkeeping runs and what it typically saves.

Frequently Asked Questions

Owner-Operator Bookkeeping Services in SE Los Angeles

J.P Bookkeeping works with independent trucking owner-operators throughout Downey, Norwalk, Compton, Paramount, Lynwood, Long Beach, and the surrounding areas of Southeast Los Angeles County. Jimmy Paz is a QuickBooks Advanced ProAdvisor who is bilingual in English and Spanish. He understands the specific financial pressures California owner-operators face: IFTA quarterly filings, per diem log management, AB5 classification documentation, multi-state depreciation reconciliation, and the California FTB's non-standard estimated tax schedule.

If your books are behind, you are not claiming the per diem, or you are filing IFTA returns from partial records, a free consultation is the fastest way to see where you stand and what a correct setup would look like. Book directly at the link or call (323) 816-0517.

Disclaimer: J.P Bookkeeping is a bookkeeping firm, not a CPA or law firm. For tax planning, legal questions, or regulatory compliance, consult a licensed CPA or attorney. Information reflects publicly available requirements as of June 8, 2026. Confirm current IRS rates and thresholds at irs.gov and ftb.ca.gov before filing.