Navajo Nation Sales Tax: Rates, Exemptions, and Penalties

The Navajo Nation sales tax is a 6 percent tribal tax on the gross receipts of retail sales made within the reservation’s boundaries in Arizona, New Mexico, and Utah. It is collected by the Office of the Navajo Tax Commission under 24 N.N.C. §§ 601–624, and it applies independently of any state sales or gross receipts tax that may also reach the same transaction.¹

What the 6 Percent Applies To

The tax is figured by multiplying applicable gross receipts for the period by 0.06.² Anyone engaged in retail sales inside Navajo Nation boundaries owes it.

The reach is broad. A 2020 amendment narrowed the “sale for resale” definition, pulling services, items bought for the buyer’s own consumption, and items that will be further processed or used for commercial purposes into the tax base.³ Contractors, consultants, and other service providers working on tribal land generally owe the 6 percent on what they earn there.

When calculating gross receipts, a business may exclude amounts that already went through the Navajo Nation Oil and Gas Severance Tax, the Navajo Tobacco Products Tax, or the Navajo Nation Fuel Excise Tax, so the same dollars are not taxed twice by different tribal levies.²

What Is Exempt

Section 609 of the sales tax code lists transactions that escape the 6 percent. The main ones:

Sales for resale. Only the final retail sale is taxed, not the wholesale step.
Agricultural and livestock activities conducted within the Navajo Nation.
Prescription drugs, prosthetics, hearing aids, insulin syringes, blood sugar monitors, prescription eyeglasses, durable medical equipment, and similar items used primarily for medical purposes.
Sales by hospitals, nursing homes, mental health facilities, kidney dialysis centers, blood banks, and similar healthcare facilities.
Nonprofits recognized under IRC § 501(c)(3) or § 501(c)(19), unless the sales come from an unrelated trade or business.
Sales by primary and secondary schools, colleges, and job training programs.
Sales related to traditional Native American ceremonies or services.
Occasional sellers who are not regularly in the business of selling goods or services.
Coin-operated vending machines, funeral and burial services, newspaper sales, food stamp and child nutrition voucher purchases, and private-use motor vehicles that will not be resold or used in a business.²

Fresh fruits, fresh vegetables, filtered bottled water, nuts, nut butters, and seeds get a separate carve-out under § 605(A), which prohibits the tax on those items outright.²

Subcontractors

A subcontractor can avoid the sales tax if the general contractor has already reported and paid all taxes due on the project or has formally assumed liability by issuing a certificate of exemption. The subcontractor must get that signed certificate from the general contractor and keep it on file. Without it, the subcontractor owes the full 6 percent.²

The Extra 2 Percent on Junk Food

On top of the 6 percent, the Healthy Diné Nation Act imposes a separate 2 percent tax on foods with minimal or no nutritional value. Taxed items include sweetened beverages, chips, prepackaged snacks high in salt or saturated fat, and sweets.⁴ A bag of chips at a reservation convenience store carries the 6 percent sales tax plus this additional 2 percent.

Registering With the Tax Commission

Anyone who owns an interest in a Navajo Nation lease or engages in any business activity within the reservation must register with the Office of the Navajo Tax Commission by filing Form 100 before the first declaration return is due under any Navajo tax law.⁵

Form 100 is not a one-time filing. It must be resubmitted every year by January 15, even if nothing has changed. Any change in address, ownership, or designee triggers a separate filing within 30 days of the change. A late Form 100 costs a $50 penalty.⁵

The Office of the Navajo Tax Commission is at P.O. Box 1903, Window Rock, AZ 86515. Forms are on the Tax Commission’s website at tax.navajo-nsn.gov.⁶

Filing and Paying

Sales tax returns are filed quarterly on Form 600, and each return is due 45 days after the end of the calendar quarter:⁷

First quarter (January–March): due May 15
Second quarter (April–June): due August 15
Third quarter (July–September): due November 15
Fourth quarter (October–December): due February 15

If a due date falls on a Saturday, Sunday, or legal holiday, it moves to the next business day. For mailed returns, the postmark counts as the filing date.⁷

Payments under $10,000 should be made by check or money order payable to the Office of the Navajo Tax Commission. Mail Form 600 and the payment to P.O. Box 1903, Window Rock, AZ 86515.⁷

Penalties for Late Filing or Late Payment

Filing late and paying late carry separate penalties, and they can stack.

A late return costs 5 percent of the tax due for each month or partial month it is late, with a minimum penalty of $200. The late-filing penalty caps at 25 percent of the tax due, though the $200 floor still applies if 25 percent would be less.⁸

If the return is on time but the payment is late, the penalty is an immediate 5 percent on the unpaid amount plus 0.5 percent for each month the payment stays overdue, capped at 10 percent of the tax due.⁸

Interest also accrues on unpaid tax from the original due date until the Tax Commission receives payment, regardless of any extension or stay. The rate is set by regulation rather than fixed in the statute.⁸

If You Disagree With an Assessment

An assessment can be challenged through an administrative appeal under the Tax Commission’s Rules and Procedures for Administrative Appeals. Two features surprise most taxpayers. There is no stay of payment while the appeal is pending, so the assessed amount must be paid in accordance with the Hearing Officer’s final order even while further review is being pursued. And the Tax Commission’s assessments, factual findings, and legal conclusions are presumed correct; the taxpayer carries the burden of proving otherwise.⁹

After the Hearing Officer decides, the next step is an appeal to the Navajo Supreme Court. That is not a fresh trial; the court reviews the record from the administrative proceeding under its own rules of appellate procedure. Judicial review also requires being in “good standing,” meaning all required forms have been filed with the Tax Commission.⁹

How It Interacts With State Taxes

Because the reservation crosses Arizona, New Mexico, and Utah, the Navajo sales tax does not replace state taxes. Tribal taxes are levied under the Nation’s sovereign authority and sit separately from state levies. A business operating on the reservation can owe both the 6 percent Navajo sales tax and the applicable state transaction or gross receipts tax, depending on the transaction and each state’s rules on taxing activity on tribal land. Confirm the specific obligation with the Navajo Tax Commission and the relevant state revenue department rather than assuming one tax absorbs the other.

1
Office of the Navajo Tax Commission. Office of the Navajo Tax Commission
2
Navajo Nation Office of the Navajo Tax Commission. Navajo Nation Code Title 24 Taxation Chapter 6 Sales Tax
3
Navajo Nation Office of Legislative Services. Navajo Nation Sales Tax
4
Centers for Disease Control and Prevention. The Navajo Nation Healthy Dine Nation Act: A Two Percent Tax on Foods of Minimal-to-No Nutritional Value
5
Office of the Navajo Tax Commission. Navajo Nation Form 100 Instructions
6
Build Navajo. Office of the Navajo Tax Commission
7
Office of the Navajo Tax Commission. Navajo Nation Sales Tax Form 600 Instructions
8
Navajo Nation Office of Legislative Services. Navajo Nation Uniform Tax Administration Statute
9
Navajo Nation Office of the Navajo Tax Commission. Rules and Procedures for Administrative Appeals