Sure. The kind of soy sauce you have can very much change its shelf life. This is really about how long it will last with its best flavor. Here is a quick comparison of some different soy sauces.
Tamari and Other Gluten-Free Soy Sauces
Tamari is usually made with little to no wheat. The life span of this kind is directly related to that of regular soy sauce. The main preservative ingredients are the same. These include fermented soybeans, salt, and water. You have to keep it in the fridge after opening. It should last at least a year.
Artisanal or “Nama” (Unpasteurized) Soy Sauce
If you have a special, unpasteurized soy sauce, then you should treat it like a fresh product. These are the same as “nama” in Japan. These sauces are with live cultures and have incredible delicate flavors. They absolutely need refrigeration and are best enjoyed in 3 to 6 months. So, you will experience their vibrant, unique taste.