Iowa Contractor Taxes and Licensing: Repair Labor, Registration and Income Tax

In Iowa, labor on new construction, reconstruction, alteration and remodeling is exempt, and the contractor pays tax on materials as the final consumer. Repair and installation labor is a taxable service, so on a repair job you charge the customer the 6% state rate (plus any local option tax) on parts and labor.

Is contractor labor taxable in Iowa?

Sometimes, and that's what makes Iowa different from most of its neighbors. The Iowa Department of Revenue's contractor's guide says "otherwise taxable labor is exempt from sales and use tax when on or connected with new construction," and the same exemption covers reconstruction, alteration, expansion and remodeling. Repair work is not exempt. The guide lists carpentry repair, roof and glass repair, electrical and plumbing work, painting, landscaping, welding and demolition among the "taxable services typically associated with the building trades."

The line between the two can be thin. The guide's own example: "replacing damaged or missing shingles on a roof is taxable repair," but "replacing the entire roof on an existing structure is considered reconstruction." A plumber who fixes a leaking drain is doing taxable repair; the same plumber repiping a house during a remodel is not.

Who the customer is usually doesn't change the answer. The guide says "the type of taxpayer does not determine the taxability of a particular job," and "jobs for most nonprofit organizations, including churches, are not exempt." Work for designated exempt entities follows a separate process with project paperwork, covered on the department's page for construction contracts with designated exempt entities.

Materials and use tax in Iowa

On construction jobs, Iowa treats you as the end user: "contractors are generally final consumers of building materials, supplies, and equipment." You pay sales tax to the supplier, or use tax if the supplier didn't charge Iowa tax, and you don't charge the customer sales tax on the job. On repair jobs you're selling a taxable service, so you collect tax from the customer on the taxable charges. Getting this backward is the most common Iowa mistake: charging tax on a remodel, or forgetting to charge it on a repair call.

Iowa's state rate is 6%. The contractor's guide adds that "local jurisdictions may impose a local option sales tax (LOST)," and "the rate is 1%." One quirk: "if a sale is subject to use tax, no local option tax is imposed." Look up the rate for a job address on the Iowa tax mapper. For the general rules on out-of-state purchases and items pulled from resale stock, see use tax for contractors, and for how other states split labor and materials, see sales tax on labor vs. materials.

Iowa contractor licensing and registration

Iowa layers a statewide registration on top of trade licenses. DIAL requires contractor registration for anyone earning "at least $2,000 a year from construction." The fee is $50. You need an Iowa unemployment insurance number even with no employees. Employers must show a certificate of workers' compensation coverage. Out-of-state contractors must file a $25,000 bond.

Iowa Code section 103.8 says "no person, except a person licensed as an electrical contractor, shall engage in the business of providing new electrical installations," and section 103.9 requires the contractor to employ a licensed master electrician and be registered under chapter 91C. Plumbing and mechanical contractors must be "licensed with the board and also registered with DIAL." Cities still issue building permits and may have local rules, so call the building department where the job is. Our contractor license guide covers how licensing works in general.

Iowa income tax for contractors

For tax year 2026, the Iowa Department of Revenue says "Iowa law provides for a flat tax rate of 3.8 percent… all levels of taxable individual income will be subject to this rate." That's what most sole proprietors, LLC members and S corp owners pay on business profit passed through to them. C corporations pay 5.5% on the first $100,000 of taxable income and 7.1% above that for tax years beginning in 2026, unchanged from 2025.

Because nobody withholds tax from your business profit, you'll generally make quarterly estimated payments to both the IRS and Iowa. See quarterly estimated taxes for contractors, or rough out your federal payments with the quarterly estimated tax calculator.

Workers' comp in Iowa

Iowa's Workers' Compensation Division, part of DIAL, says "Iowa law requires most employers to either" buy workers' comp insurance or register as self-insured. It also says the exemptions are complex, and some depend on how much an employee earns in a year, so check with the division before you assume you're exempt. Contractor registration also asks employers for proof of coverage. More background: workers' compensation.

Local taxes in Iowa

Local sales tax in Iowa is the 1% local option sales tax where voters have approved it, so the rate on a taxable repair can differ from one town to the next. Check the rate for the job address before you invoice. Iowa income tax questions beyond the state rate, such as local surtaxes, are worth raising with your CPA or the department when you file.