Kosher for Passover is a separate certification, not an upgrade to your existing one. It is stricter in ways that surprise manufacturers, it is seasonal, and it needs planning months ahead. A plant that is comfortably certified year-round can still be unable to run a Passover production on short notice.
If you are considering it for next Passover, the time to start is now.
What is prohibited, and why the usual rules do not apply
Two categories are excluded during the eight days:
Chametz — wheat, barley, oats, rye and spelt that have been allowed to leaven. This reaches much further into a formulation than bread: malt, malt extract, most vinegars and the products built on them, many enzymes, some alcohols, starches, dextrose and glucose derived from wheat, and a long list of processing aids.
Kitniyos — a category kept by Ashkenazi communities covering corn, rice, legumes, soy, peanuts, mustard, sesame, sunflower, and several seeds and spices. Since corn and soy derivatives are in a remarkable share of processed food, this is usually the harder constraint in practice.
Here is the part that catches people. Year-round, a tiny quantity of a problematic ingredient can sometimes be disregarded because of the ratio it sits in. For Passover, that does not apply. A product is not certified for Passover if it contains chametz or kitniyos, even at levels far below any threshold that would matter the rest of the year. There is no trace allowance to fall back on.
That single rule is why Passover certification is a different exercise rather than a stricter version of the same one.
The narrow exception: kitniyos that has changed
There is one meaningful allowance. Where a kitniyos-derived material has been transformed into something chemically and functionally different from its origin — kitniyos shenishtaneh — it may be acceptable. In practice this covers a short list: certain emulsifiers built on a kitniyos base, some sweeteners, citric acid and its derivatives, erythorbates, and enzymes fermented from kitniyos.
Three warnings attach to it:
- If actual kitniyos is added back into the transformed product downstream, the allowance is lost.
- Several of these materials carry independent Passover problems anyway — an erythorbate made using a chametz-derived yeast extract, or a material produced on equipment that ran chametz.
- Whether a given ingredient qualifies is a determination to be made by your certifying agency, not an assumption to make from a category name. Never assume an ingredient is in this group.
Preparing the plant
Equipment that has produced chametz must be kashered before a Passover run. The method depends entirely on the equipment and how it was used, and it is prescribed case by case — there is no universal procedure. Some materials kasher straightforwardly; others are harder; hard plastics are generally kashered in current practice.
Equipment used for kitniyos is treated more leniently, and where a product was not predominantly kitniyos, kashering may not be required at all. This is a genuine planning advantage worth establishing early, because it can be the difference between a feasible Passover run and an impossible one.
The practical consequence is scheduling. Kashering has to happen after your last chametz run and before your Passover run, and it takes the line out of service. That is a production-planning problem as much as a kosher one.
Supervision is full-time
Passover productions are run with a mashgiach present throughout — not periodic inspection. Where a real chametz concern exists, there is no flexibility on this at all. Where the only issue is kitniyos, a lighter arrangement is sometimes possible, but it depends on the specifics and is not something to plan around until confirmed.
Budget for it. Full-time supervision for the duration of the run is the largest single cost in most Passover certifications.
Labelling, and why stamps are not accepted
This is where Passover programmes most often run into trouble, because the controls are unusually tight and for good reason.
- Separate Passover labels are the expectation for retail product. Stickers and stamps applied to year-round packaging are generally not accepted, because they are trivially easy to misapply — accidentally or otherwise.
- Running year-round label stock through the press to add the Passover designation is sometimes permitted, but the addition must read as an integral part of the label rather than something added afterwards, and the artwork needs approval.
- Bulk product is generally handled differently — designated by lot number on the letter of certification, signed by the mashgiach, or sealed with controlled tape.
- Running out of Passover labels mid-production is not solved by improvising. Adding a P by hand to year-round packaging is not acceptable. Stop and call us.
- Leftover Passover packaging is removed from the plant or sealed and signed at the end of the run. Uncontrolled Passover label stock sitting in a plant is a real risk.
One more distinction worth knowing: some simple products — raw nuts, plain fruit, water, sugar, coffee — are acceptable for Passover without special certification. That does not entitle them to carry a Passover symbol. The symbol signifies that the production itself was supervised, and a substantial part of the market buys on exactly that basis.
Planning the season
Passover production runs months before Passover, because product has to reach shelves in time. Working backwards, you need the certification scoped, ingredients approved, kashering scheduled, supervision booked and labels printed well in advance of that.
The reward is a concentrated, high-demand season with materially less competition than the year-round shelf, because many manufacturers never take it on. For the right product, it is one of the better commercial opportunities in kosher.
If you are thinking about Passover, talk to us early — we will tell you honestly whether your formulation and your plant can support it, and what it would take. Get a free quote, or read what the Pure K-P designation means.