The interlocking identity rules for wine labels sit at 27 CFR 4.23 (varietal designations), 27 CFR 4.25 (appellations of origin), 27 CFR 4.26 (estate bottled), and 27 CFR 4.27 (vintage wine). Unlike Parts 5 and 7, Part 4 was not recodified in 2022, so these section numbers have been stable for decades. What trips wineries up is not finding the rules — it is that the rules reference each other, and a single label claim can silently import three others.

The Percentage Framework at a Glance

Every geographic and varietal claim on a wine label carries a numeric floor:

Varietal Designations (§ 4.23)

Under 27 CFR 4.23(b), a single grape variety name may be used as the wine's type designation only if not less than 75 percent of the wine is derived from grapes of that variety — and, easy to miss, the entire 75 percent must have been grown in the labeled appellation of origin area. A varietal designation therefore cannot stand alone: it requires an appellation on the label, and the qualifying grapes must come from inside it.

Section 4.23(c) carves out two exceptions:

• Vitis labrusca varieties (such as Concord) may be labeled at 51 percent, provided the label states "contains not less than 51 percent (name of variety)" — the statement is not required once the wine reaches 75 percent

• Varieties TTB has found too strongly flavored at 75 percent minimum content get the same 51-percent treatment on application

Multi-varietal labels (e.g., "Cabernet Sauvignon–Merlot") are governed by § 4.23(d): all listed varieties must total 100 percent of the wine with percentages shown. There is no separate federal "85% for vinifera" rule — the 85 percent figures in Part 4 belong to AVA appellations and vintage dating, not varietal content.

Appellations of Origin (§ 4.25)

27 CFR 4.25(b) sets the base rule: an American wine may bear a country, state, or county appellation if at least 75 percent of the wine is derived from fruit grown in the named area, the wine was fully finished in the required place (in the labeled state or an adjacent state for a state appellation; within the state containing the labeled county for a county appellation), and it conforms to the named area's laws governing composition and designation. Imported wines follow the parallel rule in § 4.25(b)(2).

That last conformity clause matters: states may impose stricter rules, and California does. Under state law, wine labeled with the "California" appellation must be made from 100 percent California-grown grapes — a famously higher bar than the federal 75 percent floor.

Additional appellation structures:

• Multicounty appellations (§ 4.25(c)): up to three counties in the same state; all fruit must come from the listed counties, with each county's percentage on the label at a ±2% tolerance

• Multistate appellations (§ 4.25(d)): up to three contiguous states, all fruit from the named states, percentages disclosed, wine fully finished in one of them

• Viticultural areas (§ 4.25(e)): an AVA established under 27 CFR Part 9 may be named if not less than 85 percent of the wine comes from grapes grown within its boundary and the wine is fully finished within the state (or one of the states) containing the AVA. Overlapping AVAs may both be named where 85 percent of the wine comes from the overlap

Vintage Dates (§ 4.27)

A vintage date is a purity claim about time, and 27 CFR 4.27(a) makes it conditional on geography: vintage-dated wine must be labeled with an appellation of origin. The percentage floor then depends on the kind of appellation:

• Labeled with an AVA (or foreign equivalent): at least 95 percent of the wine from grapes harvested in the labeled calendar year

• Labeled with a non-AVA appellation (country, state, county): at least 85 percent from the labeled year

The 85 percent tier was added in 2006 (T.D. TTB-45); before that, all vintage claims required 95 percent. Section 4.27(a) also caps the volume: a winery may not remove more vintage-labeled wine than it actually produced of that vintage.

Estate Bottled (§ 4.26)

"Estate bottled" is the strictest claim in Part 4. Under 27 CFR 4.26(a), the term may be used only if the wine is labeled with an AVA appellation and the bottling winery: (1) is located in the labeled AVA; (2) grew all of the grapes on land it owns or controls within the AVA; and (3) crushed, fermented, finished, aged, and bottled the wine in a continuous process — the wine never leaving the winery's premises. There is no percentage tolerance; it is 100 percent or nothing. A special rule in § 4.26(b) treats grapes grown by members of a cooperative bottling winery as grown by the winery.

How the Rules Interact

The sections chain together, and the chain is where COLA problems start:

• A varietal claim requires an appellation, and the varietal's qualifying 75 percent must be grown inside that appellation (§ 4.23(b))

• A vintage claim requires an appellation, and the percentage floor (95 vs. 85) depends on whether that appellation is an AVA (§ 4.27(a))

• An estate bottled claim requires an AVA specifically, plus total control of growing and production (§ 4.26(a))

• An AVA claim requires 85 percent from the boundary plus in-state finishing (§ 4.25(e))

So a label reading "2024 Napa Valley Cabernet Sauvignon, Estate Bottled" is simultaneously asserting: 85 percent Napa Valley fruit, 75 percent Cabernet Sauvignon grown in Napa Valley, 95 percent 2024 harvest, and 100 percent estate-grown grapes processed continuously on premises. TTB reviews these claims at COLA issuance under 27 CFR Part 13, and misstatements are also prohibited practices under § 4.39 — sourcing records need to substantiate every tier before the label is filed, because blend adjustments after approval can quietly invalidate the certificate.

How Truli Helps with Wine Label Identity Compliance

• Percentage-rule verification: Truli's AI agents check varietal, appellation, vintage, and estate claims against the actual 75/85/95/100 percent thresholds in §§ 4.23–4.27, citing the exact section for each finding

• Claim-interaction analysis: Truli flags missing prerequisites — a vintage date without an appellation, a varietal without a qualifying appellation, or "estate bottled" without an AVA

• COLA-readiness scans: Truli reviews the complete label against Part 4 mandatory information before submission, so identity claims and required statements arrive at TTB consistent

• Marketing drift detection: Truli scans websites and social content for appellation or vintage claims that outrun what the approved label actually supports

Related Regulations

• TTB 27 CFR Part 4 — Wine Labeling — The full wine labeling rule these sections belong to

• TTB 27 CFR Part 13 — COLA Label Approval — How appellation and vintage claims get reviewed before market

• 27 CFR 5.141–5.156 — Distilled Spirits Standards of Identity — The spirits-side identity system of classes and types

• TTB Advertising Rules — 27 CFR — Identity claims repeated in ads must match the label

• TTB 27 CFR Part 16 — Health Warning Statement — The mandatory Government Warning on every container

Frequently Asked Questions

Can I label a wine "Chardonnay" without naming a place?
No. Under § 4.23(b), a varietal designation requires an appellation of origin on the label, and the entire qualifying 75 percent of the named variety must have been grown within that appellation.

Why is my Napa Valley wine held to 95 percent for vintage but my "California" wine only 85 percent?
Section 4.27(a) sets a 95 percent floor for wines labeled with a viticultural area (an AVA like Napa Valley) and 85 percent for other appellations, like a state. Note that California separately requires 100 percent California grapes for the "California" appellation itself under state law.

Can I say "estate bottled" if I buy grapes from a neighboring vineyard inside my AVA?
No. Section 4.26(a) requires that the bottling winery grew all of the grapes on land it owns or controls within the labeled AVA, and that crushing through bottling happened in a continuous process on premises. Purchased fruit — even from inside the AVA — defeats the claim, unless the special cooperative rule in § 4.26(b) applies.

Do these rules apply to imported wine?
Yes, with parallel provisions. Imported wines may use foreign appellations at the 75 percent level under § 4.25(b)(2), foreign viticultural areas at 85 percent under § 4.25(e), and vintage dates under the same 95/85 tiers in § 4.27, provided the wine conforms to the origin country's own composition and designation laws.

A note from Truli: Truli is not a law firm, and this article does not constitute or contain legal advice or create an attorney-client relationship. When determining your obligations and compliance with respect to relevant laws and regulations, you should consult a licensed attorney.

Last updated: August 2026. Reflects the cited 27 CFR sections as of August 2026. Truli monitors TTB rulemaking and enforcement. Book a demo to see how.