Many growing ecommerce businesses discover the same problem: they had nexus in a state for a year or more, never registered, and never collected tax. The voluntary disclosure agreement (VDA) is the standard way to fix that on better terms, but it is not always the right tool. This guide answers when do you need a sales tax VDA: the warning signs, how to size your exposure, how a VDA compares with other options, and when it is not worth the effort. For the basics of how VDAs work, start with our sales tax voluntary disclosure agreement guide.
Key takeaways
- You likely need a VDA when you had nexus in a state for past periods, did not collect tax, and the state has not contacted you yet.
- A VDA typically limits the lookback to about three or four years and waives most penalties; interest is usually still owed.
- Once a state contacts you, such as with a nexus questionnaire or audit notice, you usually lose VDA eligibility.
- Tax you collected from customers but did not remit is generally owed in full, VDA or not.
A VDA in One Paragraph
A VDA is an agreement in which you come forward before the state finds you, register, and pay back tax for a limited lookback period, usually with interest. In return, the state typically waives most penalties and does not pursue periods before the lookback. You can often start anonymously through a representative, and the Multistate Tax Commission’s National Nexus Program can coordinate disclosures with several participating states at once.
Warning Signs You May Need a VDA
- You recently realized you passed a state’s revenue or transaction threshold in a prior year.
- Amazon or a 3PL has stored your inventory in states where you also made direct sales; see FBA warehouse physical nexus.
- You hired remote employees or contractors, or attended trade shows, in states where you are not registered.
- A buyer, investor or lender is doing due diligence and asks about sales tax compliance.
- Your accountant or a new sales tax tool flags unregistered states.
- You started selling taxable services or digital products without checking whether they are taxable.
Step 1: Estimate Your Exposure
You cannot decide without a number. For each state, estimate exposure from the date nexus began:
Exposure = uncollected tax on taxable direct sales since nexus began + penalties + interest
Uncollected tax = taxable sales into the state (excluding marketplace-collected and documented exempt sales) × average combined rate
- Find the date you first had nexus, physical or economic.
- Pull direct taxable sales into the state from that date, excluding sales collected by marketplaces.
- Remove exempt sales you can support with certificates.
- Apply an average combined rate; check local rates on our state pages or with the Sales Tax Calculator.
- Add estimated penalties and interest to see the cost of doing nothing.
Step 2: Compare Your Options
| Option | How it works | Best for | Main risk |
|---|---|---|---|
| Voluntary disclosure agreement | Come forward, pay tax for a limited lookback, penalties usually waived | Material exposure over several years | Requires accurate records and interest payments |
| Register and file back returns | Register with an earlier start date and file past returns | Short or small exposure, often within the last year | Penalties may apply, and no lookback limit |
| Register going forward only | Start collecting now; ignore the past | Exposure that is truly immaterial | Registration forms often ask for your first sale date, which can flag prior periods |
| Do nothing | Continue without registering | Not recommended | Unlimited lookback for unfiled periods, full penalties, and growing liability |
Step 3: Use a Simple Decision Matrix
| Your situation | Usual answer |
|---|---|
| Several years of uncollected tax and no state contact | VDA |
| Nexus began only a few months ago | Register now and file any short back period |
| All sales into the state were collected by marketplaces | Often no VDA needed; check whether the state requires registration |
| State already sent a nexus questionnaire or audit notice | VDA usually unavailable; respond and negotiate with an advisor |
| Exposure in many states | Prioritize by size; consider a multistate VDA |
| You collected tax but never remitted it | Remit immediately; most states exclude this from VDA relief |
Worked Example: VDA vs Doing Nothing
Example: an online retailer sold $150,000 a year into Georgia from 2022 to 2025 without registering
Average combined rate: about 7.4%
Full exposure, 4 years: $600,000 × 7.4% = $44,400 tax, plus penalties and interest
VDA with a 3-year lookback: $450,000 × 7.4% = $33,300 plus interest, with most penalties waived
Tax saved by the lookback alone: $11,100, before counting penalties that can add 10% to 25% or more
Lookback periods, penalty rates and terms vary by state and are set in each agreement. The figures above are illustrative.
When a VDA Is Not Worth It
- Tiny exposure: if the back tax is a few hundred dollars, registering and filing back returns may cost less than the VDA process.
- Marketplace-only sales: if marketplaces collected all tax, there may be little or nothing to disclose.
- Exempt customers: if your buyers are resellers or exempt organizations and you can gather certificates, the taxable base may be close to zero.
- Prior contact: if the state has already reached out, you are usually no longer eligible.
How to Prepare Before You Apply
- Stop the exposure from growing: turn on tax collection in your store or plan to register soon after the agreement.
- Assemble sales data by state, channel and year, and reconcile marketplace vs direct sales.
- Collect missing exemption documentation for exempt customers.
- Engage a tax professional to submit anonymously and negotiate terms.
- Budget for tax and interest; some states allow installment plans.
Conclusion
When do you need a sales tax VDA? When you have meaningful uncollected tax for past periods, the state has not contacted you, and a limited lookback with penalty relief will cost less than the alternatives. Quantify exposure first, compare options, and act before a state letter takes the choice away. Explore our state sales tax pages, the Add or Remove Sales Tax Calculator, and more guides on the Tax Rate Center homepage.
Frequently Asked Questions
When should I file a voluntary disclosure agreement for sales tax?
Consider a VDA when you had nexus in a state for past periods, did not collect or remit tax, the exposure is material, and the state has not yet contacted you about it.
Can I still get a VDA after a state contacts me?
Usually not. Most states require that you come forward before any contact about the tax, such as a nexus questionnaire, audit notice or letter.
How far back does a sales tax VDA usually go?
Commonly three or four years, or back to when nexus began if that is shorter. Without a VDA, a state can often go back to the start of every unfiled period.
Is a VDA worth it for a small amount of back tax?
Not always. If the exposure is small, registering and filing back returns may be simpler and cheaper than the VDA process, even if some penalties apply.
Does a VDA cover tax I collected but never paid?
Generally no. Tax collected from customers is held in trust for the state, and most states require it to be paid in full for all periods, outside any lookback limit.