Catching Up on Sales Tax You Should Have Collected

What happens if I did not collect sales tax I should have?

A seller that had a duty to collect may owe the state the tax on taxable sales even though its invoices did not charge customers. Late periods can also bring penalties and interest. Texas says the seller is responsible for the correct amount; each state applies its own rules.

Work state by state: identify when collection became required, separate direct taxable sales from marketplace sales and tax already collected, then check disclosure eligibility before identifying the business, registering, or filing back returns. Follow that state's sequence to address past tax and current sales. Use published instructions or an anonymous inquiry where available (Texas; California). For the first-date question, see when you must collect sales tax.

Who pays tax I never collected: me or my customers?

The seller may have to pay the state even if it cannot recover the tax from customers. In Texas, the seller must collect and pay the correct tax, while a purchaser who was not charged tax may separately owe use tax (Texas sales tax collection; Texas use tax). A purchaser's possible use-tax duty is not a safe reason to leave the seller's missed periods unresolved.

Whether a seller can seek reimbursement on a past sale depends on the state's rules and the sale terms. Keep the original invoices and payment records; do not treat an uncharged amount as tax already collected.

How far back can a state make me pay?

There is no nationwide lookback period. An unfiled return can leave older periods open: New York says its ordinary assessment time limit does not apply to a period with no return. A voluntary disclosure agreement may limit the periods owed. For example, California's qualifying out-of-state use-tax program limits assessment to three years, compared with an otherwise applicable eight-year period for that program (California CDTFA). That is not a deadline for other states or tax types.

Do not estimate the exposure by counting back an assumed number of years. Build the sales history from the first possible collection date, then compare it with the state's assessment rules and any written disclosure offer. The Multistate Tax Commission says states set their own lookback periods and methods.

What is a sales tax voluntary disclosure agreement, and do I qualify?

A voluntary disclosure agreement, or VDA, is a written arrangement to report and pay past tax for specified periods, register if required, and comply going forward. In return, a state may limit older periods and waive some penalties. Interest is usually still due unless the state expressly waives it (Multistate Tax Commission).

Eligibility depends on the state, the tax type, prior contact, and your filing history. Texas generally requires that the Comptroller has not already contacted the business about the liability or notified it of an audit (Texas program). California's out-of-state use-tax program requires an out-of-state seller with no prior CDTFA registration. It excludes California sales-tax cases and anyone who holds or held a seller's permit; the failure must be due to reasonable cause, not negligence or intent to evade tax (California program). New York excludes, among others, a taxpayer already under audit for the disclosed tax and periods or billed for the past-due tax (New York program).

Should I register first or apply for voluntary disclosure first?

Check the state's sequence before registering, paying, or filing old returns. Prior registration or contact can close a VDA route, but California's out-of-state program specifically requires a new voluntary registration followed by signed Form CDTFA-38 within 30 days. The form also has a request for penalty relief. New York tells applicants to wait for its acceptance letter and agreement before filing the returns covered by the application (New York Tax Department).

If California income or franchise tax returns may also be missing, check the Franchise Tax Board's separate program before registering with the Secretary of State. That registration disqualifies its voluntary disclosure program; it is separate from CDTFA registration.

For a multistate application, the Multistate Tax Commission treats a prior return, payment, or state inquiry about the tax type as prior contact. Its process calls for the agreement before the required registration and back returns. Check the state program before taking a step that identifies the business.

Can I apply without giving my business name?

Sometimes. Texas permits a company representative to make the initial traditional VDA request without naming the business; the name is disclosed after preliminary approval and return of the signed agreement. After both sides sign, tax data and payment are due within 60 days under the agreement (Texas Comptroller). California offers an anonymous written opinion on whether stated facts appear to qualify, which is not the application itself (California CDTFA).

Through the Multistate Tax Commission, the state sees a case number until an agreement is signed. The Commission still requires contact information from the person submitting the application. New York's online program has its own process; do not assume every state accepts an anonymous application.

What is the lookback period, and are penalties and interest waived?

The lookback period is the set of filing periods the agreement requires you to report and pay, including the current period when required. The relief is written into the state's agreement; it is not a blanket erasure of unpaid tax, penalties, or interest (Multistate Tax Commission).

I owe several states: is there one application for all of them?

The Multistate Tax Commission offers one coordinated application for participating states, but each state decides its own agreement and terms. It does not handle states outside its program, and the seller still completes each state's registration. It will not process a state application if the good-faith estimate for that state's lookback period is below $500 (Multistate program; program FAQ). Include every affected tax type when assessing a state's offer; a sales-tax VDA does not automatically settle an income or franchise-tax duty.

Streamlined Sales Tax registration is different. Only Tennessee currently offers amnesty through that system. Its terms require registration through the system, collection or payment in applicable full member states, and continued compliance for at least 36 months; tax already collected is excluded. It is not a nationwide VDA.

I got a nexus questionnaire: what do I do?

Read the notice for each tax involved and its response deadline. Gather the requested activity dates, locations, permits, sales records, and ownership details, then answer its factual questions from those records on time. Texas Form AP-114, for example, is a franchise-tax nexus questionnaire; it asks about permits and ownership too. An inquiry can end VDA eligibility for the tax type involved (Multistate Tax Commission); other taxes or states may remain eligible. If it covers several taxes or an audit, bring the notice and records to a bookkeeping review before responding.

Do marketplace sales change what I owe?

Yes. Separate sales for which a marketplace collected and remitted tax from your own direct sales, but keep both in the sales history. Texas says certified marketplace providers remit tax on facilitated sales, while the seller must handle taxable sales outside the marketplace. Texas also includes marketplace sales when measuring its remote-seller threshold (Texas marketplace FAQ).

Keep the marketplace's collection certification and sales reports. Do not assume marketplace collection removes registration, reporting, or other state-tax duties. For example, Texas says inventory in a marketplace warehouse can create franchise-tax responsibility for a taxable entity (Texas marketplace FAQ). If your Canadian business stores inventory in US warehouses, see Canadian sellers with US inventory.

Check each state's back-return reporting rules. Texas includes certified marketplace sales in total Texas sales but excludes them from taxable sales (Texas marketplace FAQ).

What if I collected tax but never sent it in?

Treat collected but unremitted tax as a separate and urgent balance. Texas has no VDA lookback limit for it and does not waive its interest (Texas Comptroller). New York has a separate limited-lookback rule for collected trust taxes, and a return already filed without full payment is not eligible for its VDA (New York lookback; New York program).

Match the tax shown on each customer invoice to deposits, returns, and state payments. Do not mix it with estimates of tax never charged. A notice, several states, or collected tax calls for a bookkeeping review before filing or negotiating.

What records do I need to work out the amount?

Start with a sale-by-sale export that shows the sale date, delivery location, product or service, charge, tax charged, refunds, and sales channel. Group it by state and filing period, then mark exempt sales and marketplace sales supported by records. Texas requires gross-receipts records and support for deductions and exclusions; without records, it may estimate the liability (Texas recordkeeping FAQ).

• Invoices, order exports, shipping addresses, refunds, and payment records.
• Marketplace sales reports and proof that the marketplace undertook tax collection.
• Resale and exemption certificates for sales treated as untaxed. Texas warns that sales without the required evidence are presumed taxable in an audit.
• Prior registrations, returns, payments, VDA correspondence, questionnaires, and audit letters.
• A timeline of offices, staff, contractors, inventory, and selling activity in each state, for the nexus review.

For California's sales-threshold review, gather related persons' California sales too: its rule combines those sales with the retailer's own (California CDTFA).

If the source records do not yet produce sales by state and period, see catching up on overdue books.

Example

Illustrative US dollars only; the rate and dates are assumptions, not a state's rules.

A seller finds $100,000 of direct taxable sales to one state in a missed period. None of those invoices charged sales tax or said it was included in the price. At an illustrative 8% combined rate, the uncollected tax is $8,000. The same seller has $40,000 of marketplace sales for which the marketplace shows it collected and remitted tax. Keep those sales in the records review; whether they count toward the seller's collection threshold depends on the state (see when you must collect sales tax). The seller does not add another $3,200 to its unpaid-tax estimate solely because those sales occurred.

The seller checks the state's collection start date, local rates, exemptions, marketplace evidence, and VDA terms before filing. Any penalty or interest is separate from the $8,000 illustration.

Different for you?

• You are unsure when collection became required: see when you must collect sales tax.
• Your business is outside the US: see foreign sellers and US sales tax.
• A Canadian business has US warehouse inventory: see Canadian sellers with US inventory.
• Your sales records are incomplete: see catching up on overdue books.
• State income or franchise returns may also be missing: see catching up on unfiled business returns.
• You also missed Canadian GST/HST registration: see when to register for GST/HST.
• Several states, a questionnaire, an audit notice, or collected but unpaid tax are involved: gather the sales history and notices for a bookkeeping review.