Sales & Use Tax

Understanding Sales Tax Obligations

Businesses that sell taxable goods or services are required to collect sales tax from their customers and remit those collections to the state on a prescribed schedule — typically quarterly, though high-volume businesses may be required to file monthly. The obligation is not limited to what was collected. It extends to what should have been collected — meaning that a business that failed to charge sales tax on taxable transactions may still owe the full tax amount to the state.

Like federal payroll taxes, sales tax collected from customers is considered trust fund money. It belongs to the state from the moment it is collected — the business holds it temporarily and is legally obligated to remit it. When a business uses those funds for operating expenses instead — a decision that often begins as a temporary cash flow measure — the state's response is not limited to the business entity. In California and many other states, responsible individuals can be held personally liable for the unpaid trust fund amounts — exposing the personal assets of business owners, officers, and those with financial control over the business.

What Happens When a Business Falls Behind

Sales tax delinquencies escalate with a speed that surprises many business owners. A single missed filing triggers penalties. A pattern of non-filing triggers something far more serious.

When a business fails to file sales tax returns, the state does not simply wait. It estimates the business's sales volume — using industry averages, prior period filings, or other available data — and assesses tax based on that estimate. These estimated assessments are almost always significantly higher than the actual liability — and they carry the full weight of a formal assessment from the moment they are issued.

Once an estimated assessment becomes final it is extremely difficult to challenge. The burden shifts to the business to prove that the actual liability is lower — which requires producing the very records the business failed to maintain or submit in the first place. At Blackridge Tax, we intervene before assessments become final whenever possible — and when they already have, we pursue every available avenue to challenge, reduce, and resolve them.

Beyond the financial consequences, the operational consequences of a sales tax delinquency can be existential:

Sales Tax Permit Revocation The state can revoke or refuse to renew a business's sales tax permit — its legal authority to collect and remit sales tax. Without a valid permit, the business cannot legally operate. For retail businesses, restaurants, and any operation that depends on the ability to transact with customers, permit revocation is not a technicality. It is a shutdown.

Business License Suspension Many licensing boards — including those governing contractors, healthcare providers, financial professionals, and other licensed practitioners — require proof of tax compliance as a condition of license maintenance. A sales tax delinquency can trigger license suspension or revocation proceedings that put an entire professional practice at risk.

Liens & Levies State tax authorities can file liens against business assets and the personal assets of responsible individuals, levy business bank accounts, and seize inventory — often with less procedural notice than the IRS is required to provide.

Personal Liability In California, the CDTFA has the authority to assess responsible individuals — business owners, officers, and those with financial control — directly for unpaid trust fund sales taxes. This personal liability assessment can follow individuals long after the business has closed.

Use Tax — The Overlooked Obligation

Use tax is the complement to sales tax — and one of the most commonly overlooked tax obligations facing businesses today. Use tax applies when a business or individual purchases taxable goods or services without paying sales tax — typically in out-of-state or online transactions where the seller did not collect California sales tax.

The purchaser is responsible for self-assessing and remitting use tax directly to the state. Most businesses are unaware of this obligation until they are audited — at which point the assessment covers multiple years of untaxed purchases, plus penalties and interest, and the total can be substantial.

State auditors have become increasingly sophisticated in identifying use tax liabilities — particularly for businesses that make significant purchases from out-of-state vendors, purchase equipment or supplies online, or operate in industries where capital expenditures are common. A use tax audit can produce assessments that bear little relationship to what a business reasonably believed it owed — particularly when auditors rely on indirect estimation methods rather than actual purchase records.

At Blackridge Tax, we represent businesses in use tax audits, challenge indirect estimation methodologies, and negotiate settlements that reflect the actual tax owed rather than the state's inflated estimates.

Multi-State Sales Tax Obligations

For businesses operating in multiple states or selling products and services to customers in other jurisdictions, the sales tax landscape has become significantly more complex following the Supreme Court's 2018 decision in South Dakota v. Wayfair. That decision eliminated the physical presence requirement for sales tax nexus — meaning that a business with sufficient economic activity in a state is now required to collect and remit that state's sales tax even without a physical location there.

For businesses that have been selling into multiple states without collecting sales tax — or without filing returns in states where they have established economic nexus — the potential exposure can be substantial. Many states have Voluntary Disclosure Programs that allow businesses to come forward proactively in exchange for reduced lookback periods and penalty relief.

At Blackridge Tax, we evaluate multi-state sales tax exposure comprehensively — identifying every state where nexus exists, calculating the potential liability, and pursuing the most favorable resolution available in each jurisdiction — including voluntary disclosure where appropriate.

The California CDTFA — What Business Owners Need to Know

The California Department of Tax and Fee Administration is one of the most aggressive state tax collection agencies in the country. The CDTFA administers not only California sales and use tax but a range of other business taxes and fees — and it has broad authority to audit, assess, and enforce against businesses and responsible individuals alike.

CDTFA auditors are experienced, well-resourced, and increasingly sophisticated in their use of indirect audit methods — statistical sampling, markup analysis, and purchase ratio testing — to estimate sales volume and assess tax when business records are incomplete or unavailable. These indirect methods can produce assessments that bear little resemblance to a business's actual sales tax liability.

At Blackridge Tax, we represent businesses through every stage of the CDTFA audit and enforcement process — from the initial audit notice through administrative appeals and beyond. We challenge indirect audit methodologies, present the actual records and evidence that support the correct liability, and negotiate resolutions that reflect what the business actually owes rather than what the CDTFA's estimates suggest.

Resolution Options — State Tax Authority Negotiation

Each state has its own procedures and programs for resolving sales tax delinquencies — and the available options vary significantly by jurisdiction. At Blackridge Tax, we understand the specific programs, procedures, and negotiating leverage points available in California and across multiple other jurisdictions — and we pursue the resolution strategy that produces the most favorable outcome for each client's specific situation.

Installment Agreements Most state tax authorities — including the CDTFA and the California FTB — offer structured payment arrangements that allow businesses to address outstanding liabilities over time while restoring compliance and avoiding further enforcement action.

Offers in Compromise Some states — including California — have formal compromise settlement programs that allow businesses and individuals to settle outstanding liabilities for less than the full amount owed when the circumstances genuinely support it. These programs have their own eligibility requirements and application procedures distinct from the federal OIC program.

Voluntary Disclosure For businesses that have not yet been contacted by a state tax authority, voluntary disclosure programs offer the opportunity to come forward proactively in exchange for reduced lookback periods and penalty relief. Voluntary disclosure is almost always significantly more favorable than waiting for the state to initiate an audit or assessment.

Audit Reconsideration & Appeals When a state tax authority has issued an assessment that overstates the actual liability — whether through estimated assessments, indirect audit methods, or factual errors — formal reconsideration and administrative appeals processes are available. At Blackridge Tax, we pursue every available avenue to challenge inaccurate assessments and reduce the liability to what is actually owed.

The Blackridge Standard

Blackridge Tax represents businesses and individuals facing sales and use tax delinquencies, audits, and enforcement actions involving $50,000 or more in state tax liability. Our team includes a Board Certified Tax Specialist, attorneys licensed in six states and before the U.S. Tax Court, a CPA, and an Enrolled Agent — professionals who understand both the technical complexity of sales and use tax law and the practical realities of how state tax authorities operate and how to negotiate with them effectively.

Sales tax compliance is not optional — and neither is the expertise required to resolve it when things go wrong.