What’s the Difference Between Tamari and Soy Sauce?

Tamari and soy sauce look almost the same in the bottle, and you can swap one for the other in most recipes. The differences are what they’re made from, how they taste, and, for a lot of people, gluten.

Here’s the short answer: regular soy sauce is brewed from soybeans and wheat, while tamari is made mostly or only from soybeans. That makes tamari darker, a little thicker and rounder in flavor, and usually gluten-free. New to tamari? Start with what is tamari and how to use it.

The main difference: what they’re made of

Both are brewed from fermented soybeans and salt. The difference is the grain.

1. Soy Sauce (Shoyu)

The most common variety found in Western supermarkets, especially Japanese-style soy sauce (Shoyu), is a balanced blend.

• Ingredients: Made from a fermented mash of soybeans and wheat.
• Proportion: The wheat content is typically significant, sometimes as high as 50% of the total grain mixture.
• Flavor Profile: The wheat adds a touch of sweetness and complexity, making the flavor slightly milder and less concentrated. It is generally lighter in color and body.

2. Tamari

Tamari began as the liquid left over from making miso, which is why it’s made mostly from soybeans.

• Origin: Tamari is a traditional byproduct of making Japanese miso paste.
• Ingredients: It is made almost exclusively from soybeans with a significantly smaller amount, or often no wheat at all.
• Flavor Profile: Because of its higher soybean concentration, Tamari is darker in color, thicker in viscosity, and possesses a richer, deeper, more concentrated umami flavor than standard soy sauce. It is often perceived as less salty.

Gluten: the difference that matters most

Regular soy sauce is made with wheat, so it contains gluten. Most tamari is made with little or no wheat, but not every brand. If you need to avoid gluten, only buy tamari that’s labeled gluten-free.

Feature	Soy Sauce (Shoyu)	Tamari
Main Grains	Soybeans and Wheat	Soybeans (little to no wheat)
Gluten Status	Contains Gluten	Often Gluten-Free
Flavor Profile	Saltier, Milder, Sweeter notes	Richer, Deeper Umami, Less Salty
Appearance	Lighter color, thinner	Darker color, thicker

Note: Because traditional soy sauce relies on wheat for its brewing process, it is not gluten-free. Tamari, being primarily soybeans, is often naturally gluten-free, making it a fantastic substitute for those with celiac disease or gluten sensitivities. Always check the label to ensure it’s certified “Gluten-Free Tamari,” as some brands may add a small amount of wheat.

Can you swap one for the other?

Yes, 1:1 in almost any recipe. Tamari is a bit thicker and deeper, so in a light dressing or a delicate broth you might start with a little less and taste. In marinades, glazes and stir fries you won’t notice much difference.

When to Use Which in the Kitchen

Use this as a quick guide:

• Use Soy Sauce For:
  • Delicate Dipping: Sushi, sashimi, or gyoza.
  • Light Seasoning: Clear broths, light stir-fries, or dishes where you want a lighter color.
  • Everyday Cooking: Its mild, balanced flavor makes it an excellent all-purpose choice.
• Use Tamari For:
  • Gluten-Free Recipes: The perfect substitute in any recipe calling for soy sauce.
  • Rich Glazes & Marinades: Its deeper color and potent flavor stand up well to strong ingredients and create beautiful glazes on meats and tofu.
  • Finishing Dishes: A splash of Tamari as a finisher adds a concentrated umami punch without overwhelming saltiness.

Tamari vs soy sauce FAQ

Which one is saltier?

They’re in the same range. Soy sauce tastes sharper, so it can seem saltier. If sodium matters to you, compare labels or buy a reduced-sodium version of either.

Which is better for sushi?

Either works. Many people like tamari for dipping because it’s smoother and clings to the fish a little more.

What about light and dark soy sauce?

Those are Chinese styles. Light soy sauce is thin and salty and used for seasoning. Dark soy sauce is thicker and slightly sweet and used mostly for color. Tamari sits in between: dark in color, but still used for seasoning.

So which should I buy?

For an all-purpose bottle and you don’t mind gluten, soy sauce is cheaper and easy to find. For a richer taste, or if anyone at your table avoids gluten, go with tamari.