No, as long as your kombucha never reaches 0.5% alcohol by volume during production, at bottling, or later in the bottle. That is TTB's own answer: a producer "may produce such a product without qualifying with TTB as long as the product never reaches 0.5% alcohol by volume or more during production, at the time of bottling, or after removal due to continued fermentation in the container" (TTB Kombucha FAQ, K7 (opens in new tab)). If it crosses that line at any of those moments, it is an alcohol beverage. When the alcohol comes from fermenting sugar, it is generally classified as beer (K6), and TTB's alcohol rules apply to it.
So the question is not really about a license. It is whether you can show your kombucha stays under 0.5% at all three moments. The rest of this post works through each one.
TTB's kombucha questions (opens in new tab) were mostly last reviewed in 2015, with the two answers on testing methods (K18 and K19) updated in 2022, and the agency still publishes them as its current guidance. Your state's food rules are a separate question (see the end).
When does kombucha become an alcohol beverage?
Work down this list for each recipe you sell. A single "yes" anywhere means TTB rules apply.
- Does it reach 0.5% at any point while it ferments? If so, it "must be produced on a TTB-qualified premises," even if the finished drink tests lower. TTB's example is a kombucha that hits 1.2% during production and is brought back under 0.5% before sale: its maker still has to qualify as a brewer (K2 (opens in new tab)).
- Is it 0.5% or more when you bottle it? Then it is beer the day it leaves you.
- Can it reach 0.5% after it leaves you? This is the moment TTB singles out in K8 and K9. Say a bottle tests 0.3% on bottling day and 0.6% three weeks later on a shop shelf. TTB's answer is that such products "are alcohol beverages under the IRC," with federal excise tax and a health warning owed (K8).
The third question has a sharp edge. TTB says that if a retailer stores your refrigerate-only kombucha warm and it climbs past 0.5%, you are liable for the excise tax. "Refrigeration of the product is not an adequate method," because you cannot control what happens after the bottles leave you (K9).
If all three answers are "no," you do not need anything from TTB. You are a food producer, and food rules apply instead.
If TTB samples one of your bottles from a store and gets 0.5% or more, it "will expect the producer to either" change the production method so fermentation stops after bottling, or qualify as an alcohol producer (K8).
How do you prove kombucha stays under 0.5% ABV?
TTB does not require a non-brewer to keep alcohol records; that rule (27 CFR 25.293 (opens in new tab)) is for qualified brewers. But TTB says kombucha producers should take appropriate steps, "including testing of alcohol content," to stay under 0.5% at every stage (K17 (opens in new tab)). In practice, a dated test result is the only thing you can show an inspector or a nervous wholesale buyer.
- Know which method TTB uses. Its labs now generally use headspace gas chromatography (headspace GC-FID, AOAC 2016.12) or an enzymatic method (AOAC 2017.07); distillation-specific gravity (AOAC 935.21) is a method TTB says it used "in the past" (K18, updated 2022 (opens in new tab)). You may use any method that is "formally validated" or "otherwise scientifically valid" for kombucha under 0.5% (K19). If you are unsure whether a method qualifies, TTB names its Beverage Alcohol Lab as the office to ask (K20).
- Test the moment that worries you, not only the easy one. A reading on bottling day answers question 2 and says nothing about question 3. TTB's test is the bottle in the marketplace. So the useful extra sample is a bottle held the way a careless stockist might hold it, tested at the end of your stated shelf life. That is a practical reading of K8 and K9, not a TTB-prescribed protocol.
- Tie every result to a batch. If one bottle comes back high, you need to know which batch it came from and where the rest of that batch went. A result that belongs to no lot number protects nothing.
That last step is where a notebook usually breaks down once you have overlapping ferments. In Ardent Seller, each batch is logged as a production run with its own lot, so the lab's report can be attached to the run it tested. That way a high reading traces to one batch, and, if your sales record the lot, to the stores it went to, rather than to the whole month's output.
Do you need a TTB license if your kombucha reaches 0.5%?
If you brew at or above 0.5% on purpose, yes. TTB generally classifies kombucha fermented from sugar as beer (K6), and a beer producer must qualify as a brewer. The federal checklist looks like this (K6, K11–K16, K21 (opens in new tab)):
- Qualify as a brewer. That means an approved Brewer's Notice (opens in new tab) and a bond.
- File a formula before producing (27 CFR 25.55 (opens in new tab)).
- Pay federal excise tax on what you remove for sale.
- Mark every container with the brewer's name, the net contents, the nature of the product (such as "beer") and the place of production.
- Carry the federal health warning statement.
- Expect your stockists to register too. Retailers and wholesalers selling kombucha at 0.5% or more must register with TTB as alcohol dealers.
If your kombucha is classified as beer but is not made with both malted barley and hops, it generally follows FDA labeling rather than the Federal Alcohol Administration Act's label rules. It still carries the container marks listed above, which the Internal Revenue Code requires, and the health warning (K13). State alcohol authorities add their own licensing on top of all of this.
If a batch you meant to keep under 0.5% gets there in the bottle, those bottles are still alcohol beverages. TTB says they "must comply with all the same federal laws and regulations" as kombucha made as an alcohol beverage, including the excise tax and the health warning, and that you, the producer, are liable for that tax even when a retailer let the bottles warm up (K8, K9 (opens in new tab)). If TTB finds a bottle at 0.5% or more, it will expect you either to change your process so fermentation stops after bottling, or to qualify with TTB as an alcohol beverage producer (K8).
What about state rules?
Staying under 0.5% keeps you out of TTB's jurisdiction. It does not settle whether you can brew in your home kitchen. That is up to your state's food program, and fermented drinks may be treated differently from the baked goods most home-food rules were written for. Check your state's rules on the cottage food law hub before you assume a home kitchen counts, and ask your state agriculture or health department directly if kombucha is not named.
Whichever path you're on, you need the same records: a lot number for every batch, a test result for every lot, and a list of where each batch went. If you already keep those, add the ABV result to each batch record and the federal question is answered on paper.
Related reading
- Kombucha cost per bottle — the seven-layer per-bottle cost stack, including the reserve for the batch you have to pull when a test comes back high.
- Batch tracking for food business — how to set up the lot numbers that tie each ABV result to the bottles it covers and the stores they went to.
- Hot sauce pH testing requirements — the other small-batch product with one number that decides which rulebook you are under (pH 4.6 rather than 0.5% ABV), and the testing records that prove it.
This article is provided for educational purposes only and does not constitute legal, regulatory, food-safety, or health advice. Alcohol-content thresholds, TTB qualification, excise tax, and state food and alcohol rules vary by jurisdiction and product, and change frequently. Consult TTB, your state alcohol-beverage control and agriculture or health offices, a qualified compliance consultant, or an attorney before making compliance or safety decisions.