Form E-589CI: NC Affidavit of Capital Improvement, 25% Rule, and Penalties

Form E-589CI is the North Carolina Department of Revenue affidavit used to certify that a construction project is a capital improvement rather than a taxable repair, maintenance, or installation service. That certification changes who pays sales tax and on what: with a valid affidavit on file, the contractor pays tax only on the materials purchased for the job; without one, the contractor charges sales tax on the full invoice, labor included. The form should be completed and delivered to the contractor before the first invoice goes out, and it is available on the NCDOR website.¹

Why the Form Matters to Your Tax Bill

North Carolina’s state sales tax rate is 4.75%, and combined state-and-local rates run from 6.75% to 7.50% depending on the county.² That rate applies to very different numbers depending on how a job is classified.

When work qualifies as a capital improvement and Form E-589CI is on file, the contractor is treated as the consumer of the building materials. The contractor pays sales tax to the supplier when buying those materials and does not collect sales tax from the property owner on labor or the overall contract price.³ When work is classified as a repair, maintenance, or installation service, the contractor charges sales tax on the entire billed amount.

A $30,000 kitchen remodel treated as a capital improvement is taxed only on the materials the contractor bought. The same $30,000 billed as a repair job is taxed on the full $30,000. That one classification difference can be $1,500 or more.

When Work Qualifies as a Capital Improvement

North Carolina defines a capital improvement broadly under G.S. 105-164.3(31). A project only needs to fit one of the statutory categories to qualify:⁴

New construction, reconstruction, or remodeling.
Work that requires a State Building Code permit, unless it only involves replacing specific items like a water heater or gas logs.
Installation of equipment affixed to real property that is capitalized and depreciated under GAAP, the Internal Revenue Code, or expensed under Section 179.
Painting or wallpapering, when it is the primary job rather than incidental to a repair.
Replacing an entire roof, siding, plumbing system, electrical system, HVAC unit, septic system, irrigation system, or commercial refrigeration system.
Installing or replacing a driveway, parking lot, patio, deck, or sidewalk.
Any permanent addition or alteration that does not fall within the definition of a repair, maintenance, or installation service.

The statute specifically pulls certain items back out. Replacing a water heater, gas logs, pool heater, gutters, circuit breakers, or light fixtures on its own is treated as a repair service, not a capital improvement, unless the swap is part of a larger new construction or remodeling project.⁴

The pattern that holds across the NCDOR’s taxability chart is useful shorthand: installing or replacing an entire system or structure is almost always a capital improvement; fixing or swapping a single component inside an existing system is almost always a taxable service.⁵ A full roof replacement qualifies; patching shingles does not. Replacing an HVAC system qualifies; replacing the blower or condenser coil does not. Rewiring a building qualifies; swapping outlets does not.

Mixed Jobs and the 25% Rule

Plenty of construction contracts bundle capital improvement work with ordinary repair or maintenance tasks. North Carolina handles these mixed transaction contracts with a 25% threshold. If the repair and maintenance portion is 25% or less of the total contract price, the whole job is taxed as a capital improvement, and the contractor pays tax on materials only.⁶

If the repair portion exceeds 25% of the contract price, the contract has to be split. The capital improvement portion follows the real property contract rules; the repair and maintenance portion is taxed at the full sales tax rate on the service charges. The allocation must be reasonable and supported by the contractor’s normal business records.⁶ Getting this split wrong is one of the more common audit findings in North Carolina construction tax. If a job combines a bathroom remodel with routine maintenance on existing systems, break the pricing out in the contract before signing rather than reconstructing it later.

Who Signs the Form and Who Receives It

Form E-589CI can be issued by the property owner, a lessee who has the right to modify the property, or a real property contractor passing the affidavit down to a subcontractor. The form includes a checkbox for each role, and selecting the wrong one can invalidate the document and sink the tax treatment for the entire project.

The signer must have actual authority to bind the issuing party. For a homeowner that is straightforward. For a business, it should be a corporate officer or someone with documented signing authority. The signature carries real legal weight: the person who signs is the one on the hook if the work turns out not to qualify.⁶

The completed form goes to the contractor or subcontractor doing the work. When a general contractor hires subs, the general provides the affidavit (or copies) to each subcontractor so they can justify not collecting sales tax on their part of the job. The form is not filed with the Department of Revenue. It stays in private files as documentation in case of an audit.

What Goes on the Form

The affidavit is a single page and asks for straightforward information:

Legal name and mailing address of the person or entity issuing the affidavit, matching the name on file with NCDOR.
Legal name and address of the contractor or subcontractor receiving the form.
A checkbox indicating whether the issuer is the property owner, a lessee, or a real property contractor.
A written description of the capital improvement work. Specificity helps. “Kitchen renovation including removal of a load-bearing wall and installation of new cabinetry and countertops” holds up in an audit; “kitchen work” does not.
The issuer’s signature and date, certifying that the described work is a capital improvement to real property.

Timing and Recordkeeping

Deliver the affidavit to the contractor before the first invoice is issued, or at the time of the transaction. Waiting until after the contractor has billed and collected sales tax creates a refund mess for everyone.

Timing also matters for the contractor’s own protection. A contractor who receives the affidavit within 90 days of the sale is shielded from additional tax liability if NCDOR later decides the work was not actually a capital improvement. The same protection applies if the contractor provides the affidavit within 120 days of a substantiation request from the Secretary of Revenue.⁶

Both the issuer and the recipient should keep the signed affidavit for at least three years. North Carolina’s general statute of limitations for tax assessments is the later of three years after the return’s due date or three years after the return was actually filed, so a late-filed return pushes the retention window out.⁷

Liability When the Classification Is Wrong

If someone signs an affidavit and the work is later determined to be a taxable repair or maintenance service, the person who issued the affidavit owes the additional tax that should have been collected. The contractor who received it is generally protected, provided the affidavit arrived within the required window and no fraud was involved.⁶

That protection does not extend to “fraud or other egregious activities.” Knowingly certifying routine maintenance as a capital improvement to dodge sales tax opens the door to both the fraud exception and separate penalty provisions.

Penalties for Getting It Wrong

North Carolina stacks penalties on top of any unpaid tax when sales tax is underpaid because construction work was misclassified:⁸

Failure to pay tax when due: 5% of the unpaid tax, assuming no intent to evade.
Negligence (no intent to defraud): 10% of the tax deficiency.
Large tax deficiency, meaning understating liability by 25% or more: 25% of the deficiency.
Failure to file a return: 5% of the tax for the first month, plus 5% for each additional month, up to a 25% maximum.

For contractors, the usual scenario is a negligence penalty after an audit finds that jobs run through as capital improvements should have been taxed as repair services. The 10% penalty stacks on top of the original tax owed, plus interest. On a commercial project where the tax difference runs $10,000 or more, that is another $1,000 before interest. Keeping a properly completed Form E-589CI on file for every qualifying job is the cheapest insurance against that outcome.

1
North Carolina Department of Revenue. Form E-589CI, Affidavit of Capital Improvement
2
North Carolina Department of Revenue. Current Sales and Use Tax Rates
3
North Carolina Department of Revenue. Real Property Contracts
4
North Carolina General Assembly. North Carolina General Statutes 105-164.3 – Definitions
5
North Carolina Department of Revenue. Services to Real Property Taxability Chart
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North Carolina General Assembly. North Carolina General Statutes 105-164.4H – Real Property Contract
7
North Carolina General Assembly. North Carolina General Statutes 105-241.8 – Statute of Limitations for Assessments
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North Carolina General Assembly. North Carolina Code 105-236 – Penalties