North Carolina Ignition Interlock Requirements (2026): Who Needs One & What It Costs
North Carolina does not require an ignition interlock for every DWI — a standard first offense under 0.15% BAC typically does not trigger it. The IID becomes required when your BAC was 0.15% or higher, when you were sentenced at Aggravated Level One, or for repeat offenders. Since June 2022, low-income drivers can qualify for free installation and 50% off monthly fees through a statutory hardship waiver. Here’s what triggers the requirement and what to expect.
IID required under GS 20-17.8? Get a free quote from an NCDMV-approved provider.
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North Carolina DWI interlock requirements at a glance
| Offense term | DWI (Driving While Impaired) — NCGS 20-138.1 |
| All-offender? | No — IID is required for restoration when: BAC was 0.15%+ at time of offense; sentenced at Aggravated Level One (GS 20-179(f3)); or second/subsequent DWI within 7 years (GS 20-17.8(a)) |
| Standard 1st offense (BAC 0.08–0.14%) | No IID required for license restoration unless sentenced Aggravated Level One. Judge may order IID as condition of a limited driving privilege. |
| BAC 0.15%+ (1st offense) | IID required for restoration: 1 year from restoration date; revocation period is 1 year first (GS 20-17.8(c)) |
| 2nd DWI within 7 years | IID required: 3 years from restoration; revocation is 4 years (GS 20-17.8(c)) |
| 3rd+ DWI / permanent revocation | IID required: 7 years from restoration; underlying revocation is permanent (GS 20-17.8(c)) |
| Aggravated Level One sentencing | IID required regardless of BAC — triggered by presence of grossly aggravating factors at sentencing (GS 20-179(f3)) |
| Limited driving privilege | Judges may require IID as a condition of a limited driving privilege (LDP) during the revocation period (GS 20-179.3); time on LDP with IID counts toward the restoration IID term |
| Hardship waiver | Free installation + removal; 50% off monthly rate (GS 20-179.5(c), effective June 1, 2022). Income at/below 150% FPL or enrolled in TANF, SSI, SNAP, LIHEAP, or Medicaid. Affidavit + proof submitted to vendor; denial appealable to DMV. |
| Violation — final 90 days | Any violation in the 90 days before the IID term ends extends the requirement by 90 more days (or until violation-free) |
| Driving non-IID vehicle / BAC over 0.02 | Treated as driving-while-revoked; 1-year additional revocation |
| DMV fees | DWI restoration fee $167.75 + $50 service fee (effective July 1, 2024) |
| SR-22 required? | No — NC uses a DL-123 insurance certification form, not SR-22 or FR-44 |
| Who approves providers | NCDMV — ncdot.gov — Ignition Interlock Devices |
| Governing law | NCGS 20-17.8; 20-179.3; 20-179.5; 20-179 |
Does your DWI require an interlock in North Carolina?
The IID requirement in North Carolina is tied to specific offense characteristics — not every DWI triggers it:
- Standard 1st DWI, BAC 0.08–0.14%: No IID required for full license restoration, unless sentenced at Aggravated Level One. The judge may still require one as a condition of a limited driving privilege.
- BAC 0.15%+ at the time of the offense: IID is required as a condition of restoration — 1 year after your 1-year revocation ends.
- Aggravated Level One sentencing (GS 20-179(f3)): IID required regardless of BAC — triggered by multiple grossly aggravating factors (such as a prior DWI within 7 years, seriously injuring another person, or driving with a child passenger).
- Second or subsequent DWI within 7 years: IID required — 3 years from restoration (after 4-year revocation) for a second offense; 7 years (after permanent revocation) for a third or subsequent.
Time on a limited driving privilege counts. If the judge orders an IID as a condition of your Limited Driving Privilege (LDP) during your revocation period, that time counts toward your restoration IID term. For example, if you drive on an IID-restricted LDP for 6 months during your revocation, you have 6 fewer months remaining on the 1-year post-restoration IID requirement. Request IID as an LDP condition through your attorney — it can meaningfully shorten your total IID obligation.
Hardship waiver: free installation & 50% off monthly
North Carolina’s statutory hardship waiver (GS 20-179.5(c), effective June 1, 2022) is one of the strongest cost-relief programs in the country. If you qualify:
- Free installation
- Free removal
- 50% off the monthly monitoring/lease rate
Who qualifies: income at or below 150% of the federal poverty line, OR current enrollment in TANF, SSI, SNAP, LIHEAP, or Medicaid.
How to apply: complete a hardship affidavit and submit proof of income or program enrollment directly to the vendor. The vendor must accept it or deny it in writing — a denial is appealable to NCDMV. Use the NCDMV Interlock Hardship form.
Apply for the hardship waiver before you call for quotes. Under GS 20-179.5(c), the waiver goes directly to the provider — not through NCDMV first. Gather your income documentation or proof of SNAP/SSI/TANF/LIHEAP/Medicaid enrollment and submit the NCDMV Interlock Hardship affidavit when you contact the provider. If the provider denies your application, appeal to NCDMV.
NCDMV-approved providers
Four providers are on North Carolina’s approved list. Guardian Interlock, RoadGuard/Dräger are not on the NC list.
| Provider | Monthly est. (standard) | With 50% hardship waiver | |
|---|---|---|---|
| Intoxalock | $60–100 | ~$30–50 | 888-283-5899 |
| Smart Start | $70–100 | ~$35–50 | 800-831-3299 |
| LifeSafer | $65–95 | ~$33–48 | 800-634-3077 |
| ALCOLOCK | $60–90 | ~$30–45 | 866-700-9300 |
Confirm current NCDMV approval at ncdot.gov before signing. Guardian and RoadGuard/Dräger are not on the NC list. Hardship waiver estimates assume 50% reduction per GS 20-179.5(c) — actual reduction applies to vendor’s posted monthly rate.
What an interlock costs in North Carolina
| Installation (one time) | $70–150 (free with hardship waiver) |
| Monthly lease + monitoring | $60–100 (50% off with hardship waiver) |
| Removal | $50–75 (free with hardship waiver) |
| NCDMV restoration fee | $167.75 + $50 service fee (effective July 1, 2024) |
Over a 1-year post-restoration IID term: roughly $900–1,450 at standard rates, or approximately $450–750 at the 50% hardship rate (installation and removal free). Estimate your exact cost →
How to get installed — 5 steps
- Confirm with your attorney whether an IID is required in your case — check your BAC (0.15%+ triggers it), your sentencing level, and whether you have prior DWIs within 7 years. If your judge orders IID as an LDP condition, that time counts toward your restoration term.
- If you may qualify for the hardship waiver (income ≤150% FPL or SNAP/SSI/TANF/LIHEAP/Medicaid enrollment), gather documentation and prepare the NCDMV Interlock Hardship affidavit before contacting a provider.
- Contact an NCDMV-approved provider, confirm current approval, and submit your hardship affidavit if applicable. Schedule installation.
- Serve the full IID term. Keep a clean record — any violation in the final 90 days extends your term by 90 more days. Do not drive any vehicle without the required IID.
- After the IID term: NCDMV administers removal. Pay the $167.75 + $50 restoration fee to reinstate your license.
BAC 0.15%+ or repeat offense? Check hardship waiver eligibility and book installation.
Book installation
North Carolina uses a DL-123 form — not SR-22. NC-licensed drivers are not required to file an SR-22. Instead, NCDMV uses the DL-123 insurance certification form. See our North Carolina insurance page → for what you need and how your rates will change after a DWI.
North Carolina DWI interlock FAQ
Does every DWI in North Carolina require an interlock?
No — a standard first DWI with BAC under 0.15% does not require an IID for full license restoration, unless you were sentenced at Aggravated Level One. The IID is required when: your BAC was 0.15%+, you were sentenced Aggravated Level One, or you have a prior DWI within 7 years (GS 20-17.8). The judge may still order it as a condition of a limited driving privilege in standard cases.
What is the hardship waiver and how do I qualify?
Under GS 20-179.5(c) (effective June 1, 2022), drivers whose income is at or below 150% of the federal poverty line, or who are enrolled in TANF, SSI, SNAP, LIHEAP, or Medicaid, qualify for free installation and removal and 50% off the monthly monitoring rate. Submit a hardship affidavit with income or program documentation directly to the vendor. A vendor denial is appealable to NCDMV.
Does limited driving privilege time count toward my IID requirement?
Yes — if the judge orders an IID as a condition of your Limited Driving Privilege (LDP) during the revocation period, that IID time counts toward your post-restoration IID requirement (GS 20-17.8). Ask your attorney to include IID as an LDP condition at sentencing. It can shorten your total IID obligation by the length of time you drive on the LDP.
What happens if I get a violation in the last 90 days?
Any violation within the 90 days before your IID term is scheduled to end extends the requirement by 90 more days — or until you complete a violation-free period. Driving a vehicle without the required IID or with a BAC over 0.02% is treated as driving-while-revoked and triggers a 1-year additional revocation.
Does North Carolina require SR-22 insurance?
No — NC-licensed drivers are not required to file an SR-22 certificate. NCDMV uses the DL-123 insurance certification form instead. Your auto insurance premium will still increase at renewal after a DWI conviction.
Sources:
NCDMV — Ignition Interlock Devices;
NCGS 20-17.8; 20-179.3; 20-179.5.
Last verified August 2026.
Advertising disclosure: We may be compensated when you contact a provider through our numbers or links. This doesn’t affect our rankings or information. Content is informational only — not legal advice. Verify NCDMV approval before installation.