Wyoming sales tax is filed online through the Wyoming Internet Filing System (WYIFS), the Department of Revenue's portal, on the Sales & Use Tax Return for Licensed Vendors: Form 41 for monthly and quarterly filers, or Form 42 for annual filers. Returns are due on or before the last day of the month after the reporting period, and a licensed vendor must file a return even when there were no sales or tax to report.
This guide covers who files and how often, how to file in WYIFS, how to handle Wyoming's county-level rates, how to report no sales, how to amend a return, how to pay, the vendor compensation credit, and what late filing costs.
This article is educational information, not tax advice. Filing rules, thresholds, and penalties can change, so confirm current requirements with the Wyoming Department of Revenue, Excise Tax Division before you file.
Wyoming sales tax filing at a glance
- Who administers it: Wyoming Department of Revenue, Excise Tax Division.
- Online portal: Wyoming Internet Filing System (WYIFS), at excise-wyifs.wy.gov. The Department also accepts paper returns.
- Return: Form 41 for monthly and quarterly filers, Form 42 for annual filers. Businesses without a license report use tax on Return 44 or, for occasional sales, Return 43.
- Filing frequency: Monthly, quarterly, or annual, assigned by the Department based on tax volume.
- Due dates: On or before the last day of the month after the reporting period. Annual returns are due January 31.
- Zero returns: Required for every period.
- Payment: ACH debit or e-check, credit card through a third-party processor, or check with a voucher.
- Vendor compensation: 1.95% of the tax due, capped at $500 per reporting period, if the return and payment are postmarked by the 15th.
- Economic nexus: More than $100,000 in gross revenue from sales delivered into Wyoming in the current or preceding calendar year. There is no transaction-count test.
Who has to file, and how often
Anyone who must license as a vendor files a return for each assigned period. A business located in Wyoming that sells tangible personal property, admissions, or taxable services needs a license, and so does an online business based in Wyoming that sells taxable products or services. The Department's FAQ notes that simply forming an LLC in Wyoming does not by itself require a license; it depends on what you sell and whether you have a physical presence or meet the economic thresholds. Our Wyoming sales tax guide covers registration and nexus in more detail, and our posts on what is exempt from sales tax in Wyoming and Wyoming clothing sales tax cover product-level questions.
For out-of-state sellers, the Department's Remote Sellers bulletin (last revised August 2026) says a seller with no physical presence in Wyoming must comply as if it had one once its gross revenue from sales delivered into Wyoming exceeds $100,000 in the current or immediately preceding calendar year. The statute's second, transaction-count test was repealed by Laws 2024, ch. 67, and the bulletin lists only the $100,000 test. The bulletin also says the threshold is computed on gross sales, including wholesale, retail, and exempt sales, and that as of July 1, 2024, Wyoming no longer allows voluntary licensing by remote sellers below the threshold.
The Department assigns your form type and frequency, depending on tax volume. The Department's vendor manual gives these guidelines, based on the tax you collect per month:
| Frequency | Tax collected per month | Form | Due date |
|---|---|---|---|
| Annual | $0 to $50 | Form 42 | January 31 of the following year |
| Quarterly | $50 to $150 | Form 41 | January 31, April 30, July 31, and October 31 |
| Monthly | More than $150 | Form 41 | The last day of the following month |
The vendor manual uses 2021 examples, so treat these bands as a guide and rely on the frequency printed on your own return or shown in WYIFS. Contact the Department at 307-777-5200 or dor@wyo.gov if you think your frequency should change.
Before you start: license and WYIFS access
You need a Wyoming sales/use tax license before you can file; our sales tax permit overview explains the general process. The Department's FAQ describes a two-step online process. First you apply for a WYIFS account. Once that is approved, you use the same platform to apply for the license and manage your account, which generally takes about two weeks. The license application carries a one-time, nonrefundable $60 fee. To file electronically, you sign in to WYIFS with your user name, password, and a numeric PIN the Department provides after you register.
Before filing, gather your gross Wyoming sales for the period, your deductions with the supporting documents, and your taxable sales by county. Deductions for exempt sales must be supported by a Streamlined Sales Tax exemption certificate or a direct pay permit. See our Wyoming resale certificate guide for what to collect from buyers.
Step-by-step: filing a Wyoming return in WYIFS
- Sign in to WYIFS and select the Sales/Use Tax tax type.
- Choose your license, then select the unfiled return for the period you are filing.
- Confirm your business information. If you had no sales and owe no use tax, check the box for no sales or taxes to report and continue to the signature page.
- Enter taxable sales by jurisdiction. The screen is pre-filled with the jurisdictions from your last return. Add any jurisdiction where you had taxable sales, and enter use tax or excess tax due if any.
- Complete the summary. Enter gross sales and deductions. Gross sales minus deductions must equal the net taxable sales pulled from the prior screen. Do not include the sales tax you collected in gross sales.
- Review penalties, credits, and vendor compensation, then check the total due.
- Enter your PIN to submit. The PIN serves as your electronic signature, and you receive a confirmation screen and an email.
- Pay separately. Submitting the return does not submit a payment. Choose mail-in voucher, ACH debit or e-check, or credit card.
The Department's WYIFS filing guide was last revised in 2019, so screen names may differ slightly from what you see. The Department's Form 41 and Form 42 instructions, revised July 2024, describe the same lines.
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Local and county-level rate pitfalls
Wyoming's statewide sales tax rate is 4%, and counties can add optional taxes that voters approve. The Department's FAQ says the rate is based on where the customer takes possession of the item or service, and that rates generally run between 4% and 8%. On the return, tax is reported using the county-level jurisdiction name and digit code, because tax is only imposed at the state and county level. Lodging and resort district taxes use different codes, so check the Department's jurisdiction table if you sell lodging. Applying one rate to every sale leads to under- or over-collection.
The Department publishes sales/use/lodging tax rate charts and updates them as changes occur, quarterly. Our Wyoming sales tax calculator shows current rates by location, and the Department's own address lookup tool was still being reworked when we checked.
Due dates and the weekend rule
The Department's Vendor Compensation bulletin quotes Wyoming Department of Revenue Rules, Chapter 2, Section 5(c): monthly filers submit returns and tax on or before the last day of the month following the month of the sales. Quarterly filers submit by January 31, April 30, July 31, and October 31, and annual filers by January 31. If a due date falls on a weekend or a federal or Wyoming state holiday, the next business day is the new due date. You can compare these with other states on our Wyoming sales tax due dates page.
| Period | Due date |
|---|---|
| Monthly | The last day of the following month (a March return is due April 30) |
| Quarter 1 (January to March) | April 30 |
| Quarter 2 (April to June) | July 31 |
| Quarter 3 (July to September) | October 31 |
| Quarter 4 (October to December) | January 31 |
| Annual | January 31 of the following year |
For returns filed in WYIFS, the Department's rules treat the date submitted electronically as the date of filing. Payments made in WYIFS are effective on the date you choose, and the system defaults to the day you enter it.
Filing a zero return
You must file even if you had no activity. The Department's Form 41 and Form 42 instructions say a licensed vendor must file a return even if there were no sales or taxes to report, and the vendor manual says a vendor with no sales must file a return reflecting zero sales and zero tax. On a paper return, check the box for no sales or taxes to report, then sign and date the form. In WYIFS, the Department's guide says you check the corresponding box and the system takes you to the signature page. The vendor manual warns that failing to file brings late filing penalties, interest, and in extreme cases a lien.
Amending a return
To correct an error in WYIFS, open the View Returns tab, select the Filing ID of the return you want to change, and choose Amend Return. Complete the return as normal. The new submission replaces the previously filed return. If you owe more, schedule a separate payment for the difference. On a paper return, check the amended return box under the due date.
If you overpaid, the amended return creates a credit on your account. The vendor manual says the credit is available on a current return or can be refunded within 90 days of your written request, and that you should keep supporting records for three years from the date you submitted the amended return. The manual also says a refund of over-remitted tax can be requested within three years of the date the taxes were due, and that only returns with due dates within three years of the postmark date can be accepted for amendment. The Department's FAQ adds that a customer who overpaid a vendor must get the refund from the vendor, because the Department cannot reimburse the customer directly.
Payment methods
- ACH debit or e-check: Add your bank account in WYIFS and schedule the payment. If you submit a payment with an effective date of today, you cannot edit or cancel it. A future effective date can be reviewed and deleted in View Payments.
- Credit card: Processed through a third-party vendor, Convenient Payments, which charges a service fee that the Department does not receive. Confirm the fee on the payment screen.
- Check with voucher: WYIFS prints a voucher with your account information to send with your check to the Wyoming Department of Revenue, 122 West 25th Street, Suite E301, Cheyenne, WY 82002.
You can file electronically and still pay by check.
Vendor compensation credit
Wyoming lets licensed vendors and direct pay permit holders take a credit for the cost of accounting and reporting tax. The Department's Vendor Compensation bulletin, last revised August 2026, says the credit is 1.95% of the tax due, capped at $500 in any reporting period, and that it is earned by the taxpayer, not by each license.
To qualify, your account must be in good standing, and both the return and the payment must be postmarked on or before the 15th of the month the tax is due. If the 15th falls on a weekend or holiday, the next business day applies. For a return filed in WYIFS, the postmark date is the date you submit it, and a payment entered before the 15th with an effective date after the 15th does not qualify. WYIFS does not calculate the credit for you, but the Department credits your account with any compensation you earned and did not claim. Claiming too much makes the return underpaid and can disqualify your account from future credits.
The vendor manual describes an older formula (1.95% on the first $6,250 of tax and 1% above that). The current bulletin and the Form 41 instructions use a flat 1.95%, so follow the bulletin and confirm with the Department if your return calculates it differently.
Penalties and interest for late payment
The Department's Form 41 instructions and vendor manual list two penalties:
- Late payment: 10% of the tax due for paying after the due date.
- Late filing: $10 for not filing by the due date, regardless of whether any tax is due, plus an additional $25 if the return is not filed within 30 days of the Department's notice of the failure to file.
Interest is calculated at a daily rate on unpaid tax, and the State Treasurer sets the rate each year. The Department's notice for 2026 lists an annual rate of 10.75% and a daily rate of 0.02945%, effective January 1, 2026. Interest keeps accruing daily until the balance is paid, and payments are applied to fees first, then interest, then tax, then penalty.
If you cannot pay in full, the vendor manual says to file the return so your true liability is established and to request a payment plan application, and it notes the Department files a lien on a business whose payment plan is approved. Wyoming statute also allows the Department to credit or waive penalties and interest for good cause; see our notices guide below.
Common mistakes to avoid
- Skipping zero returns. Every assigned period needs a return, even with no sales.
- Assuming filing pays. Submitting in WYIFS does not submit a payment.
- Using one rate for every sale. Rates are based on where the customer takes possession, so use the county rate for that location.
- Including sales tax in gross sales. Gross sales exclude the tax you collected.
- Missing the 15th for the credit. Both the return and the payment must be timely, and a future-dated payment can disqualify you.
- Counting only taxable sales toward nexus. The threshold is computed on gross sales, including exempt sales.
- Leaving vendor compensation on multiple location returns unmanaged. The credit is earned by the taxpayer, so the Department recommends a consolidated return or letting its system calculate it.
If you receive a sales tax notice
A missed or late return often leads to a letter. Our Wyoming sales tax notices guide explains the notices the Wyoming Department of Revenue, Excise Tax Division sends, including Notice of delinquency, Assessment, and 30-day written notice before posting to the Delinquent Taxpayer List. It also covers how to ask for penalty relief: Penalty and interest waiver. Check the date on the notice, match it to your filing period, and follow the instructions on the notice itself.
Next steps for Wyoming sellers
- Download Wyoming's due dates as a calendar file, or see them on the due dates page.
- Check the combined rate for any Wyoming address.
- Get the Wyoming resale certificate to buy inventory without paying tax.
- Check whether you have nexus in other states before your sales cross a threshold.
More state filing guides
Filing in more than one state? These step-by-step guides cover the portals, due dates, and penalties in other states. See them all in our state-by-state guide to filing sales tax online.
- How to file South Dakota sales tax online
- How to file Utah sales tax online
- How to file Idaho sales tax online
Let Kintsugi file for you
If you sell in Wyoming and other states, Kintsugi's sales tax filing software prepares and files returns on each state's assigned schedule and remits payment. Monitoring across every US state is free, so you know when you cross a threshold. Filing starts at $75 per filing, with no per-state subscription. See pricing, start free, or book a demo.
Frequently asked questions
Can I file Wyoming sales tax online?
Yes. Licensed vendors can file and pay through the Wyoming Internet Filing System (WYIFS). Paper returns are also accepted.
What form do I use to file Wyoming sales tax?
Form 41 for monthly and quarterly filers, and Form 42 for annual filers. Businesses without a license report use tax on Return 44, and occasional sellers use Return 43.
When is Wyoming sales tax due?
On or before the last day of the month after the reporting period. Quarterly returns are due January 31, April 30, July 31, and October 31, and annual returns are due January 31. If a due date falls on a weekend or holiday, the next business day applies.
Do I have to file if I had no sales?
Yes. A licensed vendor must file a return even if there were no sales or taxes to report. Check the box for no sales or taxes to report and sign the return.
What is the economic nexus threshold in Wyoming?
More than $100,000 in gross revenue from sales delivered into Wyoming in the current or preceding calendar year, including wholesale and exempt sales. The Department's Remote Sellers bulletin, last revised August 2026, lists no transaction-count test.
How much is the Wyoming vendor compensation credit?
1.95% of the tax due, up to $500 per reporting period, if your return and payment are postmarked by the 15th of the month the tax is due and your account is in good standing.
Sources
Checked September 29, 2026.
- Wyoming Department of Revenue, Excise Tax Division, Home
- Wyoming Department of Revenue, Excise Tax Division, Excise Tax FAQs
- Wyoming Department of Revenue, Excise Tax Division, Sales/Use/Lodging Tax: Returns (Forms 41 to 44 and instructions)
- Wyoming Department of Revenue, Excise Tax Division, WYIFS instructions
- Wyoming Department of Revenue, Excise Tax Division, New vendor packets and Vendor Manual
- Wyoming Department of Revenue, Excise Tax Division, Educational materials, including the Remote Sellers bulletin and the Vendor Compensation bulletin
- Wyoming Department of Revenue, Excise Tax Division, Sales/Use/Lodging Tax Rates and interest rates
- Wyoming Department of Revenue, Interest rate effective January 1, 2026
