Tax Obligations for North Dakota Contractors

Contractor operations in North Dakota carry a defined set of tax obligations that span state sales tax, use tax, income tax, and federal self-employment requirements. These obligations vary by contractor type, business structure, project category, and whether the contractor is operating as a prime or subcontractor. Understanding the structural tax framework that applies to North Dakota construction activity is essential for compliance with both state and federal revenue authorities.

Definition and scope

Tax obligations for North Dakota contractors refer to the legally required reporting and remittance duties imposed by the North Dakota Office of State Tax Commissioner and the Internal Revenue Service (IRS) on individuals and entities engaged in construction, improvement, installation, and related contractor services within the state.

These obligations cover 4 primary categories:

1. Sales and use tax on materials, equipment, and certain services
2. State income tax for resident and nonresident contractors
3. Federal income and self-employment tax based on business structure
4. Withholding obligations for contractors employing workers in North Dakota

The scope of this page is limited to tax obligations arising from contractor activity in North Dakota. It does not address tax structures in neighboring states, federal contractor-specific procurement taxes, or local municipal tax codes that may apply in specific cities. Contractors performing work in both North Dakota and other jurisdictions must evaluate each state's tax authority independently. For contractor licensing requirements that intersect with tax registration, see North Dakota Contractor License Requirements.

How it works

Sales and Use Tax on Construction Materials

North Dakota imposes a 5% state sales tax (North Dakota Century Code § 57-39.2) on the gross receipts from retail sales, which directly affects how contractors purchase and bill for materials. Contractors who purchase materials and incorporate them into real property are generally treated as the end consumer of those materials — meaning they pay sales tax at the point of purchase rather than collecting it from the property owner.

However, when a contractor bills a customer for both materials and labor in a lump-sum contract for real property improvement, North Dakota does not impose sales tax on the total contract price. This distinguishes real property improvement contracts from retail sales of tangible goods.

Use tax applies when materials are purchased outside North Dakota without paying sales tax and then brought into the state for use on a project. The use tax rate mirrors the sales tax rate at 5% (North Dakota Office of State Tax Commissioner, Use Tax).

Income Tax — Resident vs. Nonresident Contractors

North Dakota imposes a state individual income tax with rates ranging from 1.10% to 2.90% as of the 2023 tax year (North Dakota Office of State Tax Commissioner, Individual Income Tax). Corporate income tax rates are set at a flat 1.41% of taxable income for C corporations (North Dakota Century Code § 57-38-30).

Nonresident contractors performing work in North Dakota are subject to state income tax on income sourced to North Dakota. Nonresident contractors with no permanent establishment in the state must still file North Dakota returns for income earned on in-state projects. This is particularly relevant to out-of-state firms operating on North Dakota public works projects or oil and gas contractor services.

Federal Self-Employment and Business Tax

Sole proprietors and single-member LLC contractors are subject to federal self-employment tax at a combined rate of 15.3% on net self-employment income up to the Social Security wage base, and 2.9% on amounts above that threshold (IRS Publication 334). Contractors structured as S corporations or C corporations follow corporate federal tax rules instead.

Common scenarios

Scenario 1: Residential Remodeling Contractor (Sole Proprietor)

A sole proprietor performing residential remodeling contractor services purchases lumber and fixtures, pays North Dakota sales tax at point of purchase, and bills the homeowner a lump sum covering both labor and materials. No additional sales tax is collected from the homeowner. The contractor files Schedule C at the federal level and a North Dakota individual income tax return, paying self-employment tax on net profit.

Scenario 2: Out-of-State Electrical Contractor

A Minnesota-based firm performing electrical contractor services on a North Dakota commercial project must register with the North Dakota Office of State Tax Commissioner, collect and remit use tax on any materials purchased outside the state, and file a nonresident North Dakota income tax return for income sourced to the project.

Scenario 3: General Contractor with Subcontractors

A general contractor who engages subcontractors does not withhold North Dakota income tax on payments to subcontractors classified as independent contractors. However, if those subcontractors are employees, the general contractor bears withholding obligations. Misclassification carries penalty exposure under both IRS guidance and North Dakota law.

Scenario 4: Equipment and Tool Use Tax

A contractor based in South Dakota purchases excavation equipment and uses it on a North Dakota project. Because no North Dakota sales tax was paid at purchase, use tax is owed to the North Dakota Office of State Tax Commissioner on the equipment's purchase price or fair market value.

Decision boundaries

The determination of which tax rules apply turns on 3 primary factors:

1. Contract type — Lump-sum real property improvement contracts are taxed differently from time-and-materials contracts, where separately stated material charges may be subject to sales tax.
2. Business structure — Sole proprietors, partnerships, S corporations, and C corporations each follow distinct federal and state income tax filing paths, affecting both rates and reporting requirements.
3. Residency and nexus — Resident contractors, nonresident contractors with a physical presence, and out-of-state contractors with no permanent establishment in North Dakota face progressively different filing and registration thresholds.

Contractors performing services on prevailing wage projects face additional payroll tax complexity due to required benefit and wage documentation. Contractors operating in the energy sector, particularly those engaged with oil and gas contractor services, may encounter additional federal excise tax considerations outside North Dakota's state framework.

The North Dakota Office of State Tax Commissioner issues letter rulings and guidance publications that clarify edge cases — including mixed contracts, interstate equipment use, and construction services delivered to tax-exempt entities. Contractors in ambiguous situations should reference official guidance directly from tax.nd.gov before filing.

References

• North Dakota Office of State Tax Commissioner
• North Dakota Century Code Title 57 — Taxation
• North Dakota Century Code § 57-39.2 — Sales Tax
• North Dakota Century Code § 57-38 — Income Tax
• North Dakota Individual Income Tax — Official Rate Schedule
• North Dakota Use Tax — Official Guidance
• IRS Publication 334 — Tax Guide for Small Business
• IRS Self-Employment Tax Overview