# How to Use Your Oath Promo Codes *How to Use an Oath Promo Code* > How to use an Oath promo code: where the checkout code box is, what to do if a code gets rejected, and why one code works once while the other doesn't. Using a promo code at Oath's checkout takes about ten seconds once you know where to look. This page walks through exactly where the code box is, what it's called, and what to do if your code doesn't apply the first time. There are two codes, and they work differently depending on whether you've ordered from Oath before. One is built for new customers only. The other works for everyone, including repeat orders, with no minimum attached. We'll cover both, plus the most common reasons a code gets rejected and how to fix it without starting your order over. None of the steps below require an account just to see a code — you can read this whole page before you've added anything to a cart. ## Where to Enter Your Code Oath's checkout uses a standard coupon field, the kind you'll find on most online stores. Here's exactly where to look, step by step. - **Add what you want to your cart.** The code applies to your order total, not to a single item, so it doesn't matter how many things you're ordering. - **Go to checkout.** Look for a line near your order total that says something like 'Have a coupon?' or 'Apply a code.' - **Click it.** A small field opens up, usually labeled Coupon Code or Promo Code, right where you'd expect a discount box to be. - **Type your code in.** No spaces before or after — copying and pasting from a note or a text message is where extra spaces usually sneak in without you noticing. - **Click Apply.** Your total should update right away, before you move on to entering payment details, so you can confirm the discount landed before you commit to anything. If you don't see that link right away, scroll — on some layouts it sits just above the final total rather than at the very top of the cart summary, and it's easy to miss on a first pass through the page. ## If Your Code Gets Rejected A rejected code almost always comes down to one of a few things. Work through this list before you give up on it and move on without the discount. - **Check for a stray space.** Copy-pasting often adds one at the start or end without you noticing, and that alone is enough to break a code. - **Check which code you're using.** One code is for new customers only. If you've ordered from Oath before, that one won't apply — you'll want the other code instead, since it has no such restriction. - **Try the other code.** If the first one won't work, the second one probably will. It has no first-order restriction and no minimum to clear. - **Make sure your cart isn't empty.** A code needs an order total to apply to, so an empty cart won't show any discount at all. - **Refresh and try again.** Occasionally a field just needs a second attempt to register properly. If none of that works, it's worth checking the expired list — the code you have might simply be dead, and no amount of retyping will fix that. ## Why One Code Works Once and the Other Doesn't Stop The two codes aren't built the same way, and that's on purpose, not an oversight. The first code is meant to get someone to try Oath for the first time, so it only works on a first order. Try it again on a second order and it won't apply. That's not a mistake — it's exactly how the code is scoped, the same way most new-customer offers work anywhere you shop online. The second code doesn't have that limit. There's no minimum order size, and there's no cap on how many times you can use it. It works on a first order and every order after that, indefinitely. If you've already used the first code once, this is the one you'll reach for the next time you order, and every time after that. You only need one code per order, not both. If you're new to Oath, use the new-customer code — it's the bigger discount. If you're not, use the other one — it's built for exactly that situation, and it won't reject you the way the first one will. ## A Few More Things Worth Knowing The code has to be applied before you pay. If you forget to add it and complete your order, Oath can't apply it after the fact — there's no code box once an order has gone through, and no way to retroactively add a discount to something already placed. Only one code works per order. The checkout won't stack the new-customer discount with the repeat-order discount, so pick whichever one actually applies to you before you check out, not after. Neither code requires an account just to see it — both are listed on this site's home page with no login involved, no signup form, nothing to fill out. You will need an account, or at least a guest checkout, to actually place the order with Oath and get tracking on it. That part isn't optional; it's just how their store works, same as most online retailers you've ordered from before. None of that is specific to Oath — it's how checkout works everywhere you shop. ## Ready to use a code? Copy either code above, then paste it into the discount field at checkout. The 20% code is for first orders; the 15% code works every time. Shop Oath Research: --- This page tracks two Oath Research checkout codes and nothing else, and it takes no commission when you use them. © 2026 Oath Promo Codes. Codes checked before posting; no commission earned on either one.