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California Diesel Fuel Tax Return BOE 501 DG

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GOVERNMENT ENTITY DIESEL FUEL TAX RETURN

STATE OF CALIFORNIA

BOARD OF EQUALIZATION

DUE ON OR BEFORE

[ FOID ]

YOUR ACCOUNT NO.

BOE USE ONLY

RA-B/A AUD REG

RR-QS FILE REF

EFF

BOARD OF EQUALIZATION

MOTOR CARRIER OFFICE

PO BOX 942879

SACRAMENTO CA 94279-6157

REPORT OF DIESEL FUEL TRANSACTIONS

REPORT WHOLE
GALLONS ONLY
 

1. Total gallons of undyed diesel fuel purchased

2. Total gallons of dyed diesel fuel purchased

3. Total gallons of undyed diesel fuel sold

4. Total gallons of dyed diesel fuel sold

GOVERNMENT ENTITY TAX RETURN OR CLAIM FOR REFUND

5. Total gallons of undyed diesel fuel used

6. Total gallons of dyed diesel fuel used

7. Total gallons of diesel fuel used (add lines 5 and 6)

8. Total gallons of diesel fuel used off-highway included in line 7

9. Taxable diesel fuel used on highway (subtract line 8 from line 7)

10. Rate of tax per gallon

11. Total tax due on diesel fuel used on highway (multiply line 9 by rate on line 10)

12. California diesel fuel tax paid to retail vendor on fuel included in line 5

13. Amount of tax due or refund claimed

14. Penalty

15. Interest

16. TOTAL AMOUNT DUE AND PAYABLE OR REFUND CLAIMED

I hereby certify that this return, including any accompanying schedules and statements, has been examined by me and to the best of my knowledge and belief is a true, correct, and complete return.

EMAIL ADDRESS

SIGNATURE

PRINT NAME AND TITLE

TELEPHONE

DATE

Make check or money order payable to State Board of Equalization

Always include your account number on your check or money order and save a copy of the return for your records.

CALIFORNIA UNDYED DIESEL FUEL WORKSHEET

Complete the worksheet below for your undyed diesel fuel purchased in a prior period but used in the current period. The amount of tax paid to a retail vendor that is calculated on line W4 must be entered on line 12 of your return. This worksheet must be submitted with your return.

REPORT WHOLE GALLONS ONLY
(A)
Diesel Fuel at
Current Rate
(B)
Diesel Fuel at
Prior Rate

W1. Gallons of undyed diesel fuel purchased from a retail vendor

W2. Rate of tax per gallon

W3. Subtotal of tax (multiply line 1 times line 2 for columns A and B)

W4. Amount of California diesel fuel tax paid to retail vendor on fuel included in line 5 of the return

INSTRUCTIONS

GOVERNMENT ENTITY DIESEL FUEL TAX RETURN

(User of Fuel Under Revenue and Taxation Code sections 60050, 60100 (a)(5)(D), and 60108)

GENERAL INFORMATION

The State Board of Equalization (BOE) is responsible for collecting taxes under the Diesel Fuel Tax Law. Every government entity owes diesel fuel tax on diesel fuel used to operate motor vehicles on the highway. You are allowed to use both dyed or undyed diesel fuel on the highway. You must pay the diesel fuel tax directly to your supplier on purchases of undyed diesel fuel. Purchases of dyed diesel fuel used on the highway must be reported and the tax paid with this return.

FILING REQUIREMENTS

The return must be filed on or before the last day of the calendar month following the period for which the tax is due. A return must be filed even if no tax is due. Be sure to sign and mail your return. Make a copy of this document for your records.

PAYMENTS

To make your payment online, go to our website at www.boe.ca.gov and select the "Make a Payment" tab. You can also pay by credit card on our website, or by calling 1-855-292-8931. If paying by check or money order, be sure to include your account number.

DEFINITIONS

Government entity means this state and its political subdivisions, except for a political subdivision that is only an exempt bus operator.

Exempt bus operator is a transit district, transit authority, school district, community college district, or county superintendent of schools, as described in Revenue and Taxation Code sections 60039 and 60040.

Dyed diesel fuel means diesel fuel that is dyed under the United States Environmental Protection Agency or the Internal Revenue Service rules for high sulfur diesel fuel or low sulfur diesel fuel or any requirements subsequently set by the United States Environmental Protection Agency or the Internal Revenue Service and considered destined for nontaxable, off-highway uses.

Undyed diesel fuel means diesel fuel that is not subject to United States Environmental Protection Agency or Internal Revenue Service diesel fuel dyeing requirements.

DEFINITIONS (CONTINUED)

Highway means any road inside California that is publicly maintained and open to the public for motor vehicle travel. Roads that qualify as highways include both interstate freeways and publicly maintained surface streets. A road within a federal area such as a national forest or military reservation also qualifies as a highway, provided it is publicly maintained and open to the public.

Roads that do not qualify as highways include:

• A road within a national or state forest, such as a logging road, that is privately constructed or maintained

• A road in a federal area that is restricted from public use

• A publicly maintained or constructed roadway that is not open to public vehicular use, for example, a bike path, a freeway under construction, or a street closed for repairs

PREPARATION OF THE TAX RETURN

Line 1. Enter the total gallons of undyed diesel fuel purchased.

Line 2. Enter the total gallons of dyed diesel fuel purchased.

Line 3. Enter the total gallons of undyed diesel fuel sold.

Line 4. Enter the total gallons of dyed diesel fuel sold.

Line 5. Enter the total gallons of undyed diesel fuel used.

Line 6. Enter the total gallons of dyed diesel fuel used.

Line 7. Enter the total gallons of diesel fuel used. Add lines 5 and 6.

Line 8. Enter the total gallons of both dyed and undyed diesel fuel used off-highway. This amount must be included in the total gallons shown on line 7.

Line 9. Enter the total gallons of diesel fuel used on highway. Subtract line 8 from line 7.

Line 10. The current rate of tax per gallon.

Line 11. Total tax due on diesel fuel used on highway. Multiply gallons on line 9 by the tax rate on line 10.

Line 12. Enter the amount of California diesel fuel tax paid to a retail vendor in California on the diesel fuel that is included in line 5. If you purchased tax paid fuel in a prior period but used the fuel in the current period, complete the California Diesel Fuel Tax Paid to Retail Vendor Worksheet on the back of the return.

Line 13. If line 11 is greater than line 12, enter the difference as tax due. If line 12 is greater than line 11, enter the difference as a negative amount (refund). A refund will be processed for this amount. Do not carry tax credits forward to another return.

Line 14. If you are filing the return or paying the tax amount shown on line 13 after the due date shown on the front of the return, you will owe a penalty of 10 percent of the amount of tax due. Multiply the tax on line 13 by 0.10 and enter here. This does not apply to credit amounts.

Line 15. If you are paying the tax amount shown on line 13 after the due date shown on the front of the return, you will owe interest. The interest rate shown on the front of the return applies for each month, or fraction of a month, that your payment is late. Multiply the tax due on line 13 by the interest rate shown, then multiply the result by the number of months, or fraction of a month, that have elapsed since the due date and enter here.

Line 16. Enter the total amount due and payable by adding lines 13, 14, and 15. If claiming a refund, enter the amount of refund claimed on line 13 as a negative.

If you need additional information, please contact the State Board of Equalization, Motor Carrier Office, P.O. Box 942879, Sacramento, CA 94279-0065. You may also visit the BOE website at www.boe.ca.gov or call the Customer Service Center at 1-800-400-7115 (TTY:711); from the main menu, select the option Special Taxes and Fees.

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What the California Diesel Fuel Tax Return BOE 501 DG Is

The California Diesel Fuel Tax Return BOE 501 DG is the state form used to report diesel fuel purchases, removals, and the excise tax due for a reporting period. It documents gallons purchased and sold, tax-exempt uses, and calculates tax liability or credit adjustments claimed against California diesel fuel tax accounts. The form supports audit trails for state compliance and must be completed using accurate purchase invoices and delivery records to reconcile gallons and compute taxes owed or refundable credits.

Why Accurate Completion Matters

Accurate completion ensures correct tax calculation, reduces audit exposure, and supports claims for exemptions or credits. Properly prepared returns shorten processing time and help avoid penalties and interest for late or incorrect filings.

Why Accurate Completion Matters

Who Typically Prepares and Submits This Return

The BOE 501 DG is prepared by fuel distributors, fleet tax administrators, and accounting staff responsible for state fuel excise reporting.

  • Fleet managers reconciling diesel purchases and on-road use for company vehicle fleets and internal chargebacks.
  • Fuel distributors and wholesalers reporting gallons removed from bulk storage and documenting tax-exempt deliveries.
  • Tax or accounting teams preparing period-close adjustments, credits, and payments for state excise accounts.

Who Signs and Certifies the Return

Authorized Officer

An executive, partner, or officer with legal authority signs to certify the accuracy of the return, acknowledging penalties for false statements and assuming responsibility for payment of tax due.

Account Preparer

An internal accountant or external tax preparer may complete the form; a preparer signature block is used if someone other than an authorized officer prepares the return.

Step-by-Step: Completing the BOE 501 DG

Follow these sequential steps to assemble documentation, complete fields, and submit the return to state authorities.

  • 01
    Gather Records: Collect invoices, delivery tickets, and exemption certificates for the reporting period.
  • 02
    Reconcile Gallons: Match purchases to sales and uses; compute taxable gallons.
  • 03
    Calculate Tax: Apply the correct per-gallon tax rate and compute total tax due or credit.
  • 04
    Sign and Submit: Ensure the authorized officer signs and submit per state filing instructions.

Key Parts of a Professional BOE 501 DG Return

A complete return groups identification, detailed usage, calculations, supporting attachments, certification, and payment information for efficient review by state authorities.

Account Details

Clear account identification including account number, legal business name, and mailing address to ensure the return posts to the correct CDTFA account and avoids misapplied payments.

Reporting Period

Explicit reporting period or date range that ties all gallon and tax calculations to a single fiscal window for auditability and rate validation.

Gallon Breakdown

Line-by-line gallons reported: purchases, exempt uses, exports, and taxable gallons with references to supporting invoices and delivery tickets.

Tax Computation

Detailed calculation using the applicable per-gallon tax rate with intermediate math shown so reviewers can reconcile to the total tax due.

Attachments

Supplier invoices, exemption certificates, and delivery tickets attached or referenced; organized attachments reduce follow-up from auditors and speed reviews.

Certification

Signed declaration by an authorized officer, including printed name and date, certifying the accuracy of the return under penalty of perjury or state tax code.

Practical Elements to Include with the Return

Including the right supporting materials and calculations reduces processing time and lowers the risk of state inquiry.

Summary Page

A one-page summary that lists total gallons, taxable gallons, total tax due, payments applied, and net balance due or credit to carry forward; helps reviewers confirm totals quickly.

Invoice Index

A numbered index tying each reported gallon line item to source invoices or delivery tickets so auditors can trace figures without searching separate files.

Exemption Documentation

Copies of exemption certificates or documented evidence for exempt uses such as off-highway agricultural use, which justify non-taxable gallon claims.

Calculation Worksheets

Supplemental worksheets showing rate sources, rounding rules, and step-by-step math to reconcile to the return's totals and to support any credit claims.

Required Identification and Core Fields

Tax Account: Account number
Business Name: Legal name
Reporting Period: Period/dates
Gallon Totals: Gallons numeric
Tax Amount: Dollars and cents
Signatory: Name and date

Configuring an Online Workflow for BOE 501 DG

Set up an online workflow to collect fields, attachments, signatures, and to route the completed return for review and submission.

Field Configuration
Account Number Field Required | Validation for numeric format
Gallon Entry Fields Numeric only | Auto-sum calculation enabled
Attachment Requirement Upload invoices | PDF or image accepted
Signature Order Signer first | Preparer second

Where to File and How the Submission Flows

Understand the routing: who reviews, how the return is submitted, and where payments are remitted to complete the filing lifecycle.

  • Prepare Return: Complete form and attach supporting documents for reviewer.
  • Internal Review: Accounting or tax team verifies calculations and evidence.
  • Submit to State: File via CDTFA online portal or approved electronic channels as directed by state guidance.
  • Remit Payment: Send payment using state-accepted methods or schedule electronic debit.

Digital Signing and eSubmission Requirements

Use an eSignature platform that supports PDF, secure storage, and audit trails when e-signing and e-submitting tax returns.

  • Document Formats: PDF, DOCX, Excel
  • Authentication: Email or SMS code
  • Integrations: CRM and storage APIs

Timelines, Typical Filing Frequencies, and Processing Notes

Filing frequency and due dates depend on account assignment and volume; common schedules include monthly, quarterly, or annual filings determined by the state.

Assigned Frequency:

State assigns monthly, quarterly, or annual filing schedule.

Payment Timing:

Tax due at time of filing unless a payment schedule applies.

Electronic Processing:

E-filed returns typically process faster than mailed returns.

Account Notices:

State issues notices for delinquency or adjustments after review.

Confirm Receipt:

Retain confirmation or tracking for proof of timely submission.

Penalties and Risks for Incorrect or Late Returns

Late Filing: Interest and late penalties may apply
Underpayment: Interest charges and potential assessment increases
Missing Documentation: Disallowed exemptions and credit denials
Intentional Misstatement: Higher penalties and potential civil or criminal action
Backup Withholding: Incorrect TINs can trigger withholding obligations
Audit Exposure: Increased documentation requests and prolonged reviews

Tips for Accurate and Efficient Completion

Adopt consistent procedures across operations, documentation, and accounting to reduce errors and speed filing.

Reconcile Before Filing
Reconcile supplier invoices and delivery records to reported gallons before creating the return; early reconciliation prevents late adjustments and reduces audit questions.
Standardize Attachments
Use a consistent naming and indexing convention for supporting invoices and exemption certificates to make auditor review faster and minimize follow-up requests.
Validate Rates
Confirm the per-gallon tax rate that applies to the reporting period and document the source used for the calculation to avoid underpayment.
Use E-signatures Securely
Collect authorized signatures with an audit trail and secure storage to preserve proof of execution and minimize lost document risk.

Real-World Examples of Digital Signing and Compliance

These customer stories illustrate how organizations manage signature workflows and compliance for critical forms and returns.

Optica Ventures LLC

Optica simplified document workflows using an eSignature tool to avoid paper delays.

  • The interface was easy to use.
  • The solution allowed their customers to sign remotely, streamlining compliance and reducing turnaround time without impacting security or recordkeeping.

Martin Properties

A property services firm moved filings and approvals online to close transactions faster.

  • Mobile signing improved completion rates.
  • They processed and executed forms online with compliance and security, enabling remote approvals and fewer in-person handoffs while maintaining audit trails.

eSignature Pricing and Feature Comparison for Filing Workflows

Pricing and feature availability vary by vendor and plan; the table compares starting price, trial availability, bulk send, audit trails, HIPAA support, and envelope limits.

signNow DocuSign Adobe Sign PandaDoc HelloSign
Starting Price $8/user/mo $15/user/mo $14/user/mo $19/user/mo $15/user/mo
Free Trial 7-day free trial Varies by plan Varies by plan Varies by plan Varies by plan
Bulk Send Yes Yes Yes Yes No
Audit Trail Yes Yes Yes Yes Yes
HIPAA Compliant Yes Yes Yes No No

Frequently Asked Questions and Troubleshooting

Common questions about the BOE 501 DG, e-signature, and recordkeeping with concise answers to avoid filing errors and delays.


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