California / CDTFA
California Back Sales Tax: Resolving CDTFA Liabilities (2026)
The short answer: California back sales tax is unpaid sales and use tax owed to the California Department of Tax and Fee Administration (CDTFA). If you can't pay in full, you can request a payment plan, hardship status, or an Offer in Compromise. Ignoring it leads to liens, levies, and seller's permit revocation.
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⏱ Your deadline: if you received a CDTFA Notice of Determination, you have 30 days from the date on the notice to file a petition for redetermination. Miss it and the assessment becomes final — your appeal rights close and collection begins.
Why you owe California back sales tax
If you hold a seller's permit, you collect sales tax from customers and hold it in trust for the state. Back sales tax usually builds up one of a few ways: you collected the tax but couldn't forward all of it during a tight month, you under-reported taxable sales, you treated sales as nontaxable when the CDTFA disagrees, or an audit found a gap between your books and your reported numbers.
The CDTFA — the agency that took over sales tax from the old Board of Equalization — turns that gap into a bill called a Notice of Determination. It shows the tax, plus penalties and interest. If a CDTFA sales tax audit produced the number, the notice follows the audit report. You can dig into exactly what the bill says in our guide to the CDTFA Notice of Determination.
What happens if you ignore a CDTFA bill
Sales tax is money you held in trust, so the CDTFA collects it aggressively. The sequence is largely automated — each unanswered step leads to a harder one:
- Notice of Determination — the formal bill. You have 30 days to petition. You are likely here.
- Demand for payment — once the assessment is final, the CDTFA demands the full balance with penalties and interest still growing.
- State tax lien — recorded against your business and, in many cases, you personally. It damages credit and clouds any property you own.
- Bank levy & wage garnishment — the CDTFA can seize funds from business and personal accounts and garnish wages through an earnings withholding order.
- Seller's permit revocation — the CDTFA can pull the permit you need to legally operate, effectively shutting the business down.
The CDTFA can also issue a dual determination — a separate assessment that makes owners, officers, or other responsible people personally liable for the business's unpaid sales tax. That means a closed corporation or LLC doesn't make the debt disappear; it can follow you home.
First: make sure the assessment is right
Before you agree to a number, check it. CDTFA audits often estimate taxable sales using markup tests, observation periods, or bank-deposit analysis — methods that can overstate what you actually owe. Pull your own records and compare:
- Match the period. Confirm the notice covers the right quarters and the right permit.
- Check the method. If the auditor projected sales from a sample, a flawed sample inflates the whole bill.
- Separate tax from penalties. Penalties for late filing, late payment, and negligence can sometimes be reduced or removed for reasonable cause.
- Watch the 30-day clock. If you disagree, file the petition for redetermination on time — even a short, clear letter preserves your appeal rights.
You can read about your appeal and payment rights directly on the CDTFA's official website and through the CDTFA Taxpayers' Rights Advocate.
If you can't pay the balance: your real options
The notice makes it sound like pay-in-full is the only path. It isn't. Depending on your situation, you may qualify for one of these:
- Payment plan (installment agreement). The CDTFA can spread the balance over monthly payments. Interest keeps running, but active collection stops while you stay current. See how it works in our CDTFA payment plan guide, and apply through the CDTFA payment plan page.
- Hardship review. If paying anything would leave you unable to cover basic living or operating costs, the CDTFA can hold collection while your finances recover.
- Offer in Compromise. The CDTFA may accept less than the full balance when your assets and income genuinely can't cover it — details on the CDTFA Offer in Compromise page. Be skeptical of anyone promising to settle "pennies on the dollar" before reviewing your numbers — that's a sales pitch, not a plan.
- Penalty relief. Late and negligence penalties may be abated for reasonable cause — illness, disaster, or circumstances beyond your control.
- Fix the underlying assessment. Sometimes the cheapest "relief" is correcting an inflated audit through redetermination, so the balance you're trying to pay was right in the first place.
How to respond, step by step
- Read the notice and find the deadline. If it's a Notice of Determination, the 30-day petition date is the date that matters most.
- Verify the amount against your sales records and returns before you agree to anything.
- If you disagree, petition for redetermination in writing within 30 days — keep a copy and proof of mailing.
- If the balance is correct but you can't pay it all, request a payment plan or hardship review before collection starts.
- If a business closed or owners may face a dual determination, or the debt tops several thousand dollars, get an experienced tax professional to review it first — the order you handle things in (returns, audit appeal, then balance) changes what you end up paying.
California back sales tax, answered
How far back can the CDTFA go for back sales tax?
For most sellers who filed returns, the CDTFA generally has three years to assess additional sales tax. That stretches to eight years if you never registered or never filed, and there is no time limit at all in cases of fraud. Once a liability is final, the CDTFA can collect on it for years through liens and levies.
What happens if I can't pay my California sales tax bill?
You have options. The CDTFA offers monthly payment plans, hardship review that can pause collection, and an Offer in Compromise when your finances genuinely can't cover the debt. The worst move is silence — unanswered bills lead to liens, bank levies, wage garnishment, and even seller's permit revocation.
Can I be personally liable for my business's back sales tax?
Yes. Under California law, the CDTFA can issue a dual determination making owners, officers, or other responsible people personally liable for unpaid sales tax when a corporation or LLC closes or can't pay. Buying a business can also trigger successor liability if you don't get a tax clearance first.
How long do I have to respond to a CDTFA Notice of Determination?
You generally have 30 days from the date on the Notice of Determination to file a petition for redetermination. Miss that window and the assessment becomes final, the appeal door closes, and collection begins. If you disagree with the amount, the 30-day deadline is the most important date on the page.
Will the CDTFA take my seller's permit over back sales tax?
It can. The CDTFA may revoke or suspend a seller's permit for unpaid sales tax, which makes operating your business legally impossible. Setting up a payment plan or otherwise resolving the balance before it gets to that point usually keeps your permit active.
This guide is general information, not tax or legal advice for your specific situation. Eligibility for IRS and California programs depends on individual facts and circumstances; no outcome is guaranteed.