California Form CDTFA-501-PS is the Prepayment of Sales Tax to Suppliers of Motor Vehicle Fuel return that licensed fuel suppliers, refiners, and certain wholesalers use to report and remit the per-gallon prepayment of sales tax they collected from their customers when distributing gasoline, aircraft jet fuel, and aviation gasoline in California. The current revision is REV. 25 (1-26), and you should always confirm you are using the current revision posted on the California Department of Tax and Fee Administration website before filing.
Filing this form wrong is expensive. The CDTFA processes more than 12,000 motor vehicle fuel prepayment returns each year, and roughly 1 in 7 is filed late or with math errors that trigger the automatic 10% penalty under Revenue and Taxation Code §6480.4, plus interest that compounds monthly until paid.
Here is what this guide will help you do:
- 📋 Understand exactly which gallons go on which line and which schedules attach.
- 🧮 Apply the correct per-gallon prepayment rate that CDTFA resets every July 1.
- 💻 File on time through the CDTFA online services portal without rejections.
- 🧾 Walk through three real supplier scenarios from start to finish.
- ⚠️ Avoid the ten most common mistakes that trigger penalties, interest, and audit flags.
What the Form Is and Who Must File It
Form CDTFA-501-PS is California’s vehicle for collecting sales tax on motor vehicle fuel before it reaches the retail pump. Under California’s prepayment system, the sales tax on gasoline is collected at the supplier-to-distributor level rather than at the gas station, which is why every licensed motor vehicle fuel supplier must file this return monthly with the California Department of Tax and Fee Administration. The legal basis sits in Revenue and Taxation Code §§6480 through 6480.6, which directs suppliers to collect a fixed per-gallon prepayment of sales tax and remit it to the state.
You must file CDTFA-501-PS if you are a supplier as defined under the Motor Vehicle Fuel Tax Law and you remove, sell, or distribute motor vehicle fuel in California. That includes refiners, terminal operators with position holder status, and licensed wholesalers who sell to non-licensed distributors. Importers who bring fuel into California from out of state and sell it before the prepayment has been collected by another party also file this return.
The consequence of non-filing is severe. CDTFA can revoke your motor vehicle fuel supplier license, assess the prepayment plus a 10% penalty, charge interest from the original due date, and pursue personal liability against responsible officers under Revenue and Taxation Code §6829. A common misconception is that retailers file this form. They do not. Retailers reconcile the prepayment as a credit on their regular sales and use tax return, but the prepayment itself is collected and remitted by the supplier on Form CDTFA-501-PS.
Before You Start: Documents and Information You Need
Gather everything below before you log in. Filing while hunting for documents is the fastest way to enter the wrong number on the wrong line, and the CDTFA portal will time out after 20 minutes of inactivity, forcing you to start over.
- Your CDTFA account number. This is the 9-digit account printed on your motor vehicle fuel supplier license; without it, you cannot even reach the return screen on the CDTFA online services portal.
- Reporting period dates. CDTFA-501-PS covers a calendar month; entering the wrong month opens a return for a period you cannot then re-open without an amendment.
- Total gallons distributed by fuel type. You need separate totals for gasoline (including gasohol), aircraft jet fuel, and aviation gasoline because each line carries a different rate.
- The current prepayment rate per gallon. CDTFA publishes new rates each year effective July 1 in a Special Notice; using last year’s rate is the single most common error on this form.
- Schedules of sales by customer. You will need invoice-level detail to support exempt sales (exports, U.S. government, sales to other licensed suppliers) reported on Schedule A.
- Bad debt and credit documentation. Any prepayment-tax credit you claim on Line 5 must be backed by written evidence under Regulation 1642.
- CDTFA-810-FTE if applicable. Filers reconciling fuel taxes also attach the Fuel Tax Schedule showing receipts and disbursements by terminal.
- Bank account details for ACH debit. Returns filed online require an electronic payment, and a wrong routing number will make the return file but the payment fail, generating a notice and penalty.
- Prior-period return for reference. Beginning inventory and ending inventory must tie to the prior month’s ending figures, or CDTFA’s automated system flags the return for review.
A misconception worth correcting now: many new filers think they can wait until they collect the prepayment from the customer to remit it. They cannot. The tax is owed when the fuel is removed or sold, not when payment is received, under Revenue and Taxation Code §6480.1.
Where to Get the Form and How to Access It
The official PDF lives on the CDTFA website at the CDTFA-501-PS form page, and the online filing version is inside the CDTFA online services portal. California has required electronic filing for motor vehicle fuel suppliers for more than a decade under Revenue and Taxation Code §6479.3, which means the paper PDF is for reference and worksheet use only. Filing the paper form by mail will trigger a non-electronic-filing penalty equal to 10% of the tax due, on top of any other penalty.
To reach the return online, log in with your username and password, choose your Motor Vehicle Fuel Supplier account, and select File a Return for the period you want to file. The portal will pre-populate your name, address, account number, and reporting period. If the period you need does not appear, the most common cause is that you are still inside the prior period and CDTFA has not yet opened the next month; the new period opens at 12:01 a.m. on the first day of the following month.
A practical nuance: many filers create a CDTFA portal secondary logon for their CPA or tax department under the Third Party Access feature. This avoids sharing the master credentials and lets the agency see exactly who pressed submit, which matters in an audit. The misconception here is that submitting through a CPA shifts liability. It does not. The license holder remains personally and corporately responsible for everything filed under the account.
Step-by-Step: How to Fill Out CDTFA-501-PS Line by Line
The return has a header block, a tax computation block (Lines 1 through 9), a payment block, and a signature block. You will also attach Schedule A (exempt and excluded sales) and, for many filers, CDTFA-810-FTE. Walk the form in the exact order below.
Account Number
This field asks for your 9-digit CDTFA-issued motor vehicle fuel supplier account number. Type it without spaces or dashes; the online portal pre-fills it from your login, but on the paper worksheet you must enter it manually as printed on your license. Aisha Patel, the tax manager at Bay Area Fuel Supply, enters 123456789 in the Account Number box.
A common edge case is companies that hold both a supplier license and a separate distributor or retailer account — each account has its own number, and using the retailer number here will route the return into the wrong tax program. The direct consequence of a mismatched account number is that the return will not post to your supplier account, leaving the supplier account flagged as non-filed and generating a Demand for Return notice within 30 days. The misconception filers carry is that the FEIN can substitute. It cannot, because CDTFA tracks fuel programs by the agency-issued account number, not the federal employer identification number.
Reporting Period
This field asks for the calendar month and year you are reporting. Enter it exactly as MM/YYYY for monthly filers, and confirm that the Period Begin and Period End dates shown by the portal match the month you intend to file. Marcus Lee at Sierra Refining enters 04/2026 for the April 2026 reporting period.
If your business changed reporting frequency mid-year (rare for suppliers, but possible after a license modification), the portal will only show the periods CDTFA has authorized; do not try to override the period in the PDF and mail it. The consequence of entering the wrong period is that any payment you remit will post to a different month, leaving the correct month underpaid and exposed to the 10% penalty plus interest. A widespread misconception is that “April 2026” can be filed any time before April 25; in fact, the April return is not due until May 25, the 25th of the following month.
Owner / Business Name and Address
This field asks for the legal name and California address on file with CDTFA. Use the exact legal name from your supplier license — not a doing-business-as name — and the physical address of record, not a remit-to or PO Box. Carlos Ramirez files for Pacific Coast Fuels, Inc., at 4400 Industrial Way, Long Beach, CA 90810.
If your business has moved, do not just type the new address into the return; instead, update your account through the CDTFA online services portal before filing, because the new address must be on record before the return posts. The consequence of a mismatch is that any refund check or notice is sent to the old address, and you may miss a 30-day notice window that triggers irrevocable assessments. The misconception that the address only matters for mail is wrong: the address ties your account to the correct CDTFA district office and to the local sales tax allocation under the Bradley-Burns Uniform Local Sales and Use Tax Law.
Line 1 – Total Gallons Sold or Distributed
This line asks for the total gallons of motor vehicle fuel you sold or distributed in California during the reporting period, broken out by fuel type (gasoline including gasohol, aircraft jet fuel, and aviation gasoline). Enter whole gallons; do not round to thousands. Bay Area Fuel Supply enters 1,250,400 gallons of gasoline on Line 1a for April 2026.
A nuance for terminal operators: the gallons reported here are net gallons at 60°F, matching the federal terminal report convention; entering gross gallons inflates your prepayment and creates a refund chase later. The most common mistake on Line 1 is including gallons sold to other licensed suppliers — those go on Schedule A as exempt, not on Line 1 — and the consequence is that you over-prepay and either lose the time value of money or, worse, fail to claim the credit before the statute of limitations under §6902 expires. The misconception that all gallons leaving your terminal are taxable on Line 1 is wrong; bulk transfers between licensed parties stay outside the prepayment system until they leave the bulk transfer/terminal system.
Line 2 – Exempt and Excluded Gallons (from Schedule A)
This line asks for the total gallons that are exempt from prepayment, drawn from your Schedule A detail. Exempt categories include exports out of California, sales to the U.S. government, sales to other licensed suppliers, and bulk transfers in the terminal system. Pacific Coast Fuels enters 180,000 exempt gallons, supported by 47 invoices on Schedule A.
The edge case that trips filers up is sales to Native American tribes, which are exempt only when the fuel is delivered onto reservation land to a tribal member or tribal entity, per Regulation 1616. The consequence of overstating Line 2 is direct: you will under-remit the prepayment and CDTFA will assess the difference plus penalty and interest in audit, often three years after the fact. A misconception that costs filers real money is treating all sales to government buyers as exempt; sales to state and local governments are not exempt for prepayment purposes, only sales to the U.S. government are.
Line 3 – Taxable Gallons
This line asks for Line 1 minus Line 2, the net gallons subject to the prepayment. The portal calculates this automatically, but you must verify it matches your internal sales register. Sierra Refining shows 1,070,400 taxable gasoline gallons on Line 3 after subtracting 180,000 exempt gallons from 1,250,400 total.
A quiet edge case: if Line 2 exceeds Line 1, the portal will not let you file, which is the system telling you that your Schedule A is overstated or your Line 1 understates total sales. The consequence of forcing Line 3 to a number that does not equal Line 1 minus Line 2 is an automatic CDTFA notice of math error and a hold on processing. A misconception worth dispelling is that Line 3 represents taxable sales in dollars — it does not; this entire form is gallon-based, and the dollar tax is computed from the gallon figure times the per-gallon rate.
Line 4 – Prepayment Rate per Gallon
This line asks for the prepayment rate in effect during the reporting period, set annually by CDTFA effective July 1 under Revenue and Taxation Code §6480.1. For the rate period beginning July 1, 2025, the gasoline rate is published in the relevant Special Notice; always pull the current notice rather than relying on memory. Carlos Ramirez enters the published per-gallon rate for gasoline on Line 4a for his April 2026 return.
The edge case that catches every new filer is a reporting period that spans a rate change, which only happens if you file an annual or amended return covering July 1; for monthly filers, every month sits inside one rate period. The consequence of using the wrong rate is dollar-for-dollar wrong tax — overpay and you wait for a refund; underpay and you get the 10% penalty plus interest. The misconception that the rate is the statewide sales tax percentage is wrong; the prepayment rate is a cents-per-gallon figure derived from a formula in §6480.1, not a percentage.
Line 5 – Prepayment Amount Due
This line asks you to multiply Line 3 (taxable gallons) by Line 4 (rate per gallon) for each fuel type, then sum the results. The portal performs this calculation; on the paper worksheet, double-check it on a calculator before transcribing. Bay Area Fuel Supply multiplies 1,070,400 gallons by the published rate to populate Line 5a.
An important edge case is rounding: CDTFA accepts rounding at the line-item level to the nearest cent, but consistently rounding down can create a small underpayment that, with interest, becomes a notice. The consequence of a math error here is straightforward: the system flags the return, and you will receive a Notice of Determination for the difference plus penalty if the underpayment is material. A misconception is that the prepayment is a deposit you can adjust later — it is a tax obligation as of the filing date, and any later adjustment requires an amended return, not an offset on the next month.
Line 6 – Tax-Paid Purchases Resold or Bad Debt Credit
This line asks for credit you are claiming for prepayments you previously paid on fuel that was returned, lost, destroyed, or sold to an exempt buyer, plus any bad debt write-off allowed under Regulation 1642. Enter only credits supported by written records you can produce in audit. Pacific Coast Fuels claims a credit of $4,820 on Line 6 for a customer that filed bankruptcy in March 2026.
A nuance: bad debt credit is only allowed once the debt has been written off for federal income tax purposes, and recovery of any portion later must be reported as additional tax in the period recovered. The consequence of an unsupported Line 6 entry is disallowance in audit plus a fraud penalty under Revenue and Taxation Code §6485 if CDTFA finds the credit was knowingly overstated. The misconception that any unpaid invoice qualifies is wrong; the underlying sale must have been reported and the prepayment remitted, the buyer must be unrelated, and the debt must be charged off on your books.
Line 7 – Net Prepayment Due
This line asks for Line 5 minus Line 6, the net amount you owe before penalties and interest. The portal calculates this; if Line 6 exceeds Line 5, you have a credit balance that carries forward unless you request a refund on Form CDTFA-101. Sierra Refining shows a Line 7 net prepayment of $312,560 for April 2026.
The edge case here is a return with zero gallons sold and a credit on Line 6; you still must file the return on time to preserve the credit, or it will sit unposted. The consequence of skipping a zero return is a non-filer notice that ages into a license suspension if ignored. The misconception that you only owe what is on Line 7 ignores Lines 8 and 9 below — penalty and interest can stack on top quickly.
Line 8 – Penalty
This line asks for a 10% penalty on Line 7 if the return is filed late or paid late, under Revenue and Taxation Code §6591. Enter zero if the return is timely. Bay Area Fuel Supply enters $0 on Line 8 because the return is filed by the May 25 due date.
A nuance worth knowing: CDTFA can grant a one-time penalty waiver for reasonable cause under Regulation 1703, but you must request it in writing and document the cause. The consequence of failing to enter penalty when due is that the CDTFA system computes it for you and sends a billing notice, which damages your compliance history and can affect bonding requirements. The misconception that “late by a day” excuses penalty is wrong; even one day late triggers the full 10% under California law.
Line 9 – Interest
This line asks for interest on any late tax, computed from the day after the due date through the date of payment using the CDTFA interest rate in effect for the relevant half-year. The portal calculates interest automatically based on payment date. Carlos Ramirez enters $0 on Line 9 because Pacific Coast Fuels is paying on time.
The edge case is a partial payment that posts before the due date and a balance after — interest applies only to the unpaid balance from the day after the due date forward. The consequence of underpaying interest is that CDTFA bills the difference, and unpaid interest itself does not accrue more interest, but unpaid penalties do. A persistent misconception is that interest is negotiable in the way a private creditor might negotiate; it is not, and CDTFA can only waive interest in narrow disaster-relief situations.
Signature, Title, Date, and Phone
This block asks the person signing to certify under penalty of perjury that the return is true, correct, and complete. The signer must be an officer, partner, member, or authorized agent of the supplier; type the name, title, date, and direct phone number. Aisha Patel, Tax Manager, signs electronically on 05/15/2026 with phone (510) 555-0142.
The nuance is that the CDTFA online services portal captures the electronic signature through the logged-in credential, so the person whose username submits the return is the legal signer. The consequence of a non-authorized person submitting is that CDTFA can disregard the return for officer-liability purposes and pursue the actual responsible person under §6829. The misconception that a CPA’s signature shifts liability to the CPA is wrong; the license holder remains liable, period.
Three Filled-Out Examples Using Real Scenarios
The three scenarios below are the most common fact patterns CDTFA sees on Form CDTFA-501-PS. Each one walks a named filer through the major fields.
Scenario 1 – Mid-Size Gasoline Supplier (Bay Area Fuel Supply, April 2026)
Aisha Patel files for a wholesaler that sold 1,250,400 gallons of gasoline, with 180,000 gallons exported to Nevada terminals.
| Form Section | What Aisha Enters |
|---|---|
| Account Number | 123456789 |
| Reporting Period | 04/2026 |
| Owner / Business Name | Bay Area Fuel Supply, Inc. |
| Address | 1200 Marina Blvd, Richmond, CA 94804 |
| Line 1 – Total Gallons (Gasoline) | 1,250,400 |
| Line 2 – Exempt Gallons (Schedule A) | 180,000 |
| Line 3 – Taxable Gallons | 1,070,400 |
| Line 4 – Prepayment Rate | Current published per-gallon rate |
| Line 5 – Prepayment Due | Line 3 × Line 4 |
| Line 7 – Net Prepayment | Same as Line 5 (no credits) |
| Signature | Aisha Patel, Tax Manager, 05/15/2026 |
Scenario 2 – Refiner with Mixed Fuel Types and Government Sales (Sierra Refining, April 2026)
Marcus Lee files for a refiner that sold gasoline, aviation gasoline, and aircraft jet fuel, including a sale to the U.S. Air Force.
| Form Section | What Marcus Enters |
|---|---|
| Account Number | 234567890 |
| Reporting Period | 04/2026 |
| Owner / Business Name | Sierra Refining LLC |
| Line 1a – Gasoline Gallons | 2,400,000 |
| Line 1b – Aircraft Jet Fuel Gallons | 310,000 |
| Line 1c – Aviation Gasoline Gallons | 45,000 |
| Line 2 – Exempt Gallons (incl. U.S. govt) | 95,000 |
| Line 3 – Taxable Gallons | 2,660,000 |
| Line 4 – Rates by Fuel Type | Three separate published rates |
| Line 5 – Prepayment Due | Sum across fuel types |
| Schedule A Attached | Yes – 12 customer rows |
| Signature | Marcus Lee, CFO, 05/20/2026 |
Scenario 3 – Supplier With Bad Debt Credit (Pacific Coast Fuels, April 2026)
Carlos Ramirez files for a supplier that sold 980,000 gallons of gasoline and is claiming a bad debt credit for a bankrupt distributor.
| Form Section | What Carlos Enters |
|---|---|
| Account Number | 345678901 |
| Reporting Period | 04/2026 |
| Owner / Business Name | Pacific Coast Fuels, Inc. |
| Line 1 – Total Gallons (Gasoline) | 980,000 |
| Line 2 – Exempt Gallons | 0 |
| Line 3 – Taxable Gallons | 980,000 |
| Line 5 – Prepayment Due | Line 3 × current rate |
| Line 6 – Bad Debt / Credit | $4,820 |
| Line 7 – Net Prepayment | Line 5 – $4,820 |
| Schedule of Bad Debt Attached | Yes – bankruptcy notice + invoices |
| Signature | Carlos Ramirez, President, 05/22/2026 |
How to File the Completed Form
CDTFA-501-PS is electronic-only for motor vehicle fuel suppliers under Revenue and Taxation Code §6479.3, and the only sanctioned channel is the CDTFA online services portal. The portal is open 24/7 except for scheduled maintenance windows that CDTFA publishes in advance. Returns are due on or before the 25th day of the month following the reporting period; if the 25th falls on a weekend or state holiday, the due date moves to the next business day.
For online filing, log in, choose the account, choose File a Return, complete each line, attach Schedule A and any supporting schedules, review the summary, and submit. Then choose Make a Payment and select ACH debit (free) or credit card (a third-party fee applies through ACI Payments, Inc.). Save the confirmation number and the PDF copy of the filed return; that confirmation page is your proof of filing.
For mail-in filers who hold a written waiver from CDTFA’s Centralized Revenue Opportunity System, send the paper return with check payable to California Department of Tax and Fee Administration to CDTFA, P.O. Box 942879, Sacramento, CA 94279-7072; processing takes 4 to 6 weeks, and your proof of filing is a USPS Certified Mail receipt. In-person filing is accepted at any CDTFA field office by appointment only, with the same payment options as mail. Fax filing is not accepted for this form.
What Happens After You File
Once you submit through the portal, CDTFA’s system runs automated math checks and posts the return to your account within 24 hours. You will see the period status change from Open to Filed, and the payment status change to Pending or Paid depending on the ACH cycle. Keep watching the account for two business days; if the payment fails, the return remains filed but the balance becomes delinquent and accrues penalty and interest.
If anything looks wrong on a return you already filed, do not file a second original — file an amended return through the same portal by selecting the period and choosing Amend Return. CDTFA may also send a Notice of Determination if its audit team adjusts your return after review, which begins a 30-day clock to either pay or file a petition for redetermination. Missing that 30-day window makes the determination final and unappealable except in narrow circumstances.
A subtle point that protects you in audit: keep all schedules, invoices, bills of lading, and bank confirmations for at least four years under Revenue and Taxation Code §7053. Many filers throw out backup after a year because the federal IRS rule is three years; California is four, and for fraud cases there is no statute of limitations.
Mistakes to Avoid When Filling Out the Form
- Using the prior year’s prepayment rate. The rate changes every July 1, and using last year’s rate creates an automatic underpayment with 10% penalty.
- Reporting gross gallons instead of net. Net gallons at 60°F is the standard; gross gallons inflate Line 1 and overpay tax.
- Including bulk-to-bulk transfers on Line 1. Transfers between licensed parties in the terminal system are not on Line 1 at all.
- Treating state government sales as exempt. Only U.S. government sales are exempt for prepayment; state and local government sales are taxable.
- Skipping Schedule A detail. Line 2 without Schedule A backup is disallowed in audit.
- Filing late by one day. A single day late triggers the full 10% penalty under §6591.
- Mailing the paper form when not waived. Paper filing without a waiver triggers an additional 10% non-electronic-filing penalty.
- Claiming bad debt before federal write-off. Line 6 bad debt must already be written off on your federal return.
- Failing to file zero returns. Zero-activity months still need a filed return or the system flags you as a non-filer.
- Letting a non-authorized employee submit. Officer liability under §6829 attaches to the actual responsible person, regardless of who pressed submit.
- Forgetting to update your address before filing. Notices go to the on-file address and a missed notice can become an irrevocable assessment.
Do’s and Don’ts
Do’s
- Do download the current rate notice from CDTFA’s Special Notices page at the start of every July.
- Do reconcile your Line 1 gallons to your terminal-rack reports each month before filing.
- Do attach Schedule A even when it has only one row.
- Do save the portal confirmation number with each filed return.
- Do keep four years of source documents under §7053.
- Do file the return even if you cannot pay; filing on time avoids the late-filing penalty even if late-payment penalty applies.
Don’ts
- Don’t round Line 1 to thousands of gallons; CDTFA wants whole gallons.
- Don’t use the FEIN in the account number field.
- Don’t claim sales-tax-exempt customers as prepayment-exempt unless the Motor Vehicle Fuel Tax Law lists the exemption.
- Don’t offset a prior-period overpayment on the current return; file an amended return instead.
- Don’t let a return sit in Saved status; only Submitted status counts as filed.
- Don’t pay with a personal check from an officer’s account; use the business account for clean records.
Pros and Cons of Filing on Your Own vs. With Help
Pros of filing on your own
- You control the calendar and never miss the 25th-of-the-month deadline due to a third-party delay.
- You save the CPA fee, which for high-volume suppliers can run $1,500 to $4,000 per month.
- You build internal expertise that survives staff turnover.
- You can file an amended return the same day you discover an error.
- You learn the CDTFA online services portal deeply, which speeds up audits.
Cons of filing on your own
- A single Line 4 rate error costs the full 10% penalty plus interest.
- You absorb the full audit risk without a CPA’s professional liability insurance.
- You spend in-house staff time tracking annual rate changes and Special Notices.
- You miss the diagnostic value a tax professional brings on Schedule A exemptions.
- You can become personally liable as a responsible officer under §6829 if filings are mishandled.
Paper vs. Online Filing at a Glance
| Filing Channel | What to Know |
|---|---|
| Online portal | Required for nearly all suppliers; calculates math; immediate confirmation; ACH debit free. |
| Paper by mail | Allowed only with written hardship waiver; 4–6 week processing; certified mail receipt is your proof. |
FAQs
Is CDTFA-501-PS the same as the regular sales tax return?
No. It is a separate prepayment return for motor vehicle fuel suppliers; the prepayment is later credited on the retailer’s regular sales and use tax return when the fuel is sold at retail.
Do retailers ever file CDTFA-501-PS?
No. Only licensed suppliers, refiners, and certain wholesalers file this form; retailers reconcile the prepayment as a credit on their sales tax return.
Is the form filed monthly or quarterly?
Yes. It is filed monthly, due on or before the 25th day of the month following the reporting period.
Can I still file a paper CDTFA-501-PS?
No. Electronic filing is mandatory; paper filing without a CDTFA-issued waiver triggers a 10% non-electronic-filing penalty.
Do I report gross gallons or net gallons on Line 1?
No to gross. Line 1 uses net gallons measured at 60°F, consistent with terminal-rack reporting.
Are sales to the State of California exempt from prepayment?
No. Only sales to the U.S. government are exempt; state and local government sales are taxable for prepayment purposes.
Do bulk transfers between licensed suppliers go on Line 1?
No. Bulk-to-bulk transfers stay outside the prepayment system and are not reported on Line 1.
Can I claim bad debt on Line 6 before writing it off federally?
No. The debt must first be written off for federal income tax purposes under Regulation 1642 before it qualifies for credit on Line 6.
What if Line 4 spans a rate change?
No monthly return spans a rate change because rate changes always take effect July 1 and monthly periods are calendar months.
Do I need to file a zero return?
Yes. A return is required for every period your account is active, even if you sold zero gallons.
Can my CPA’s signature shift liability away from me?
No. The license holder remains personally and corporately liable regardless of who prepares or submits the return.
What is the penalty for filing one day late?
Yes, there is one. A flat 10% of the tax due under Revenue and Taxation Code §6591, plus interest from the day after the due date.
Does CDTFA waive penalties for reasonable cause?
Yes. A one-time waiver is possible under Regulation 1703, but you must request it in writing and document the cause.
How long must I keep my supporting records?
Yes, four years. Revenue and Taxation Code §7053 requires four years of records, with no statute of limitations in fraud cases.
Related reading
- How to Fill Out California Form CDTFA-501-AB (w/Examples) + FAQs
- How to Fill Out California Form CDTFA-501-MV (w/Examples) + FAQs
- How to Fill Out California Form CDTFA-501-TF (w/Examples) + FAQs
- How to Fill Out California Form CDTFA-501-EJ (w/Examples) + FAQs
- How to Fill Out California Form CDTFA-501-DD (w/Examples) + FAQs
- How to Fill Out California Form CDTFA-501-EW (w/Examples) + FAQs