Abandoned Cart Email: The Recovery Flow That Earns Its Send

An abandoned cart email goes to someone who got far enough into your store to be identified and then left. We build these flows for Shopify brands, mostly on Klaviyo, and September is when we tune them. Black Friday is November 27, 2026, and peak traffic runs every setting in a cart flow at full volume, whether or not anyone has checked it.

This is the abandoned cart recovery build we’d walk a client through. It covers four decisions in cart abandonment messaging: when the first message goes out, who gets a discount, where one text fits, and who you’re allowed to email in the first place.

Timing comes first, because a peer-reviewed field experiment cuts against sending fast. In randomized experiments on more than 40,500 customers, published in the Journal of Marketing, Li, Luo, Lu and Moriguchi found that shoppers who got a cart reminder within 30 minutes to one hour of abandoning were less likely to buy than shoppers who got nothing. Reminders that arrived one to three days later had a positive incremental effect.

Every number below links to the page it came from, except the figures from Klaviyo’s abandoned cart benchmark article, which we cite by name. Klaviyo and Shopify recommendations are labeled as theirs, since both companies sell the tools they’re advising on, and we won’t repeat that caveat in every paragraph. Platform behavior is described as of September 2026, and both vendors revise these help pages often.

Shopify splits recovery into three automations in its Shopify Messaging app. Recover abandoned cart “Sends a marketing message to customers who add products to their cart, but don’t start the checkout process.” Recover abandoned checkout “Sends a marketing message to customers who start the checkout process, but don’t complete an order.” The third, browse abandonment, targets shoppers who view at least one product and leave without adding it to the cart.

For the checkout tier, Shopify’s legacy abandoned checkout documentation says “A checkout is considered abandoned if it remains incomplete for more than ten minutes after the customer has provided their email information.”

Klaviyo’s naming blurs the first two tiers. Its abandoned cart flow documentation says “Most pre-built abandoned cart flows trigger based on the Started Checkout metric,” which fires once a customer has filled out contact information and moved on to the shipping page, or reloaded the page, depending on the integration. Klaviyo’s Added to Cart flow guide spells out the split: “The default Klaviyo abandoned cart flow is triggered by the Shopify Checkout Started event, whereas the Added to Cart abandoned cart flow targets more casual shoppers who have yet to start checkout.”

Is an abandoned cart email the same thing as an abandoned checkout email? In Shopify’s vocabulary, no. One follows an add to cart, the other a started checkout. In Klaviyo’s default setup, though, the flow called abandoned cart is a checkout flow, so the shopper reading your abandoned cart email has usually already reached the shipping step. Write that email for a shopper who may have left over something the checkout showed them.

The lighter tier takes more setup and reaches fewer people. On Shopify, Klaviyo’s Added to Cart guide says you’ll need to enable the Klaviyo app embed and check the integration setting Track behavioral events before Added to Cart is tracked at all. Its onsite tracking documentation lists five ways a visitor gets identified: submitting a Klaviyo form (with profile syncing to Shopify), submitting a Shopify form, entering information on the checkout page, logging in to a Shop account at checkout, or logging in to a customer account on the store.

A visitor who hasn’t done one of those is an anonymous cart, and no Added to Cart email can reach them. The same page says that, depending on your Shopify Customer Privacy settings, “Klaviyo may not track onsite events for visitors to your Shopify store in the EU, EEA, UK and Switzerland, unless they have provided consent.” The Added to Cart audience grows only as fast as your store identifies visitors, and the same constraint governs on-site personalization on Shopify.

Baymard Institute’s cart abandonment rate list puts the average cart abandonment rate at 70.22%, calculated across 50 studies by other organizations rather than measured on any store. The underlying figures run from 55.00% to 84.27%, the studies date from 2006 to 2025, and the list was last updated September 22, 2025. Many of those studies come from companies that sell cart-recovery or ecommerce marketing software, among them SaleCycle, Listrak, Rejoiner and Barilliance, and Baymard itself sells checkout usability research.

Baymard’s own caveat is that “a large portion of cart abandonments are simply a natural consequence of how users browse ecommerce sites.” Its reasons data first notes that 42% of US online shoppers have abandoned a cart because they were just browsing, then sets that group aside. Among the remaining reasons, extra costs such as shipping, tax and fees lead at 40%. The chart on that page gives its source as a “2026 survey of 1,083 US adults who have shopped online in the past 3 months” and reports the “Percentage who selected each option, with multiple selections allowed.”

So the 70% isn’t your recoverable audience, and most of the remaining reasons are checkout and policy problems that email can’t fix by itself. Cost transparency, forced account creation and checkout errors belong to the checkout friction side of abandonment, and to our ecommerce checkout optimization work when a store needs them fixed. The abandoned cart email gets what’s left over: the shopper who meant to come back, and the one whose question an email can answer.

We couldn’t trace any figure for the share of abandoned carts that email wins back to a primary source. Klaviyo’s abandoned cart benchmark article, which reports 2023 data from Klaviyo accounts, puts the average abandoned cart flow at $3.65 revenue per recipient and a 3.33% placed order rate, the highest averages of any flow it measured. That’s vendor data about its own customers. We rank the rest of the Klaviyo flows by what they return in the lifecycle flows that pay rent.

The authors of The Double-Edged Effects of E-Commerce Cart Retargeting: Does Retargeting Too Early Backfire? start from what companies presume when they shift budget to immediate cart retargeting: that early reminders generate more click-throughs and site revisits than late ones. In Study 1, according to the published abstract, more than 40,500 customers were randomized to receive a cart reminder by email and app, or no reminder, across different hourly blocks after abandonment. Customers reminded within 30 minutes to one hour were less likely to purchase than the control group. A reminder one to three days after abandonment had a positive incremental impact.

Study 2, a separate field experiment on 23,900 customers, replicated the same double-edged result for reminders sent by SMS. The abstract doesn’t name the retailer or the product category, or say whether the reminders carried an offer, so read the result as a finding about sending a reminder, not about any particular message. The only other field experiment we found covering those first three days tested coupons, not plain reminders. The discount section below covers it.

Klaviyo’s default clears the first hour. Its flow documentation states that “Klaviyo’s pre-built abandoned cart flows include a 4-hour time delay before sending the first message if the customer does not complete their purchase.” The same page recommends a first message two to four hours after someone starts a checkout and a second email 20 to 48 hours later. It also warns: “If you email someone too soon after they abandon a cart without giving them the opportunity to finish making a purchase, you can come off as overly pushy.”

Shopify’s newer native automation has a longer default in one case. Its abandoned checkout automation documentation says a second abandoned checkout automation “defaults to a 10 hour wait time before the email is sent to customers,” while the first one you create carries over your previous legacy settings. The legacy page doesn’t state a default delay. You change the wait through Shopify Flow.

By our own arithmetic, if the second email’s 20 to 48 hours count from the first message at hour four, it lands 24 to 52 hours after the checkout started. If they count from the checkout itself, it lands at 20 to 48 hours. Either way, most of that window falls inside the one-to-three-day range where the Journal of Marketing study found the reminder helped.

The abstract reports results for the first hour and for days one to three, with no finding for the hours in between, where both platform defaults sit. Our setting follows from that: never send inside the first hour, send the first abandoned cart email at Klaviyo’s four-hour default or later, and place the second touch a day or more after the trigger. That rests on one research program and two vendor defaults. It isn’t a claim about an optimal hour, and none of these sources establishes one.

Gopalakrishnan and Park ran a field experiment with an online personal care retailer in Asia, reported in a Marketing Science Institute working paper covering 14,506 consumers. They sent SMS retargeting 4 to 28 days after abandonment and found the plain reminder ads “had no effect on any measures along the purchase funnel relative to the no-retargeting control group.” Promotions of $3 or $6 off a $20 minimum did lift the purchase rate compared with plain reminders. The channel, market and timing are all different from a DTC cart email, so we take one point from it: days after abandonment, a reminder with nothing new in it didn’t move purchases.

Citing research across thousands of its ecommerce customers, Klaviyo’s flow documentation says two to three abandoned cart messages lead to optimal performance and points to its benchmark report for how that was determined. Klaviyo’s abandoned cart benchmark article contains no analysis of message count, only the suggestion that “a common sequence might involve 3 emails.” So the count is a vendor claim with no published method behind it.

We build three touches, and the third one is conditional. That’s a design choice, not a research finding. The only hard limit is on text messages: Klaviyo’s US guidelines for SMS cart flows allow one SMS per recipient.

Three field experiments found that price incentives aimed at shoppers with abandoned carts lift purchases. Zhang and coauthors ran a randomized experiment involving more than 100 million customers and 11,000 retailers with Alibaba Group, published in Management Science, and found the promotion program “doubles the sales of promoted products on the day of promotion.” Luo, Lu and Li’s two-stage field experiment on more than 22,000 mobile users, published in Information Systems Research, found that “a price incentive is 11.4 times more effective than the scarcity message in the late stage with carts.” Gopalakrishnan and Park’s promotions, sent 4 to 28 days after abandonment, beat plain reminders too.

A later version of Gopalakrishnan and Park’s research, posted to SSRN, reports that “Coupons issued too early (within one to three days) were ineffective in lifting purchase rates,” and that the lift peaked four to nine days after an item was added to the cart. Its abstract doesn’t name the channel or the market, and it counts days from the add to cart, not from a started checkout. The day-three incentive in our flow below falls inside that one-to-three-day window, so test a third touch at day four or later against it.

The case against discounting rests on a finding from Zhang and coauthors. In the month after treatment, the promotion program increased the share of viewed products that customers added to their carts, “possibly because of their intention to get more shopping cart promotions.” It also lowered the prices those customers subsequently paid, “possibly because of their strategic search for lower prices.” The authors offer both explanations only as possibilities, and the setting was a marketplace platform’s cart promotions across 11,000 retailers, not one DTC brand’s emailed code.

Klaviyo’s help documentation is more confident than that evidence: “we don’t encourage you to include a coupon in the first email. This can train customers to abandon carts in order to get the discount and is oftentimes unnecessary.” The page doesn’t show any data behind that claim. Shopify’s abandoned checkout page goes the other way: “A great way to encourage customers to complete their checkout is to offer them a discount.”

Klaviyo’s own pages don’t agree with each other. The help doc says to hold any incentive for the final email, or to offer it only to people who’ve never purchased. The benchmark article suggests a discount in the second email at 24 hours, or incentives on high-value carts only. The SMS cart reminder guide recommends a discount in the text.

Our position, which is a recommendation and not a finding, follows Klaviyo’s help doc. The first abandoned cart email carries no discount, and an incentive appears only on the final touch, only for shoppers who’ve never bought from you. Repeat customers already know your prices. We found no study that tests first-time-only or final-touch-only discounting against a flat discount for a DTC brand, so treat the rule as a margin guard to test on your own list.

Extra costs are the top non-browsing reason in Baymard’s abandonment research, at 40%. An email can answer a cost objection without a discount. The second touch can carry that answer: your free-shipping threshold and how far this cart is from it, a delivery estimate, or your returns window.

No research tests that approach against a discount, so it’s our recommendation. If you lean on a threshold, run the subsidy math in our average order value guide first, because a threshold that most orders already clear gives away shipping revenue on every one of them.

This table is the flow we’d set up for a Shopify brand on Klaviyo’s Started Checkout trigger. Each timing comes from a source above: Klaviyo’s four-hour default, the one-to-three-day window from the Journal of Marketing study, and Klaviyo’s 48-hour limit for a cart SMS. The structure is our recommendation, and the hours are starting points for your own testing.

Day three is about 72 hours after the trigger, which is past Klaviyo’s 48-hour window for a US cart SMS, so a text can’t be the day-three touch. Repeat customers stop after touch two, which keeps the incentive where our discount rule puts it.

Klaviyo’s pre-built email carries a dynamic block showing each product’s image, title, quantity and price, and according to its flow documentation, “The dynamic block is also designed to repeat itself for each item in someone’s cart if they have multiple items.” Under the block sits a Return to Cart button, and on Shopify the restore URL variable is {{ event.extra.checkout_url }}. Klaviyo advises saving the dynamic blocks before you edit a template, because the tags are integration-specific. If you delete one, re-adding the pre-built flow from the flow library restores it.

On content, Klaviyo’s help doc says “it’s best practice to only include the products that the customer abandoned.” It adds, as its own advice with no data attached, that other products “can distract from this message and lead to an overall lower conversion rate.” Klaviyo’s older benchmark article suggests a final email with alternative product recommendations. We follow the newer help doc, so every abandoned cart email template we ship shows the abandoned cart and nothing else.

The persuasive lines in each touch are ours. Touch one gets the cart, the button and one sentence inviting questions, which Klaviyo’s flow guidance also recommends. Touch two answers whichever of shipping, delivery or returns is the likeliest objection for that cart. Touch three states the incentive with its real terms, and with a real end date if it has one.

Klaviyo’s benchmark article suggests “personalizing your subject line by including the recipient’s first name and details about the products they left behind in their cart,” and the page doesn’t show any test data behind it. We didn’t find a primary study on cart-email subject lines, so the abandoned cart subject lines below are examples we’d write, not tested winners.

We’d cut two kinds: anything that says the cart expires, for the reason in the next section, and a discount in the first subject line, which breaks the discount rule above.

Klaviyo’s SMS cart reminder guide offers a sample text that reads, in part, “your cart is about to expire! Did you want to check it out?” On a Shopify store, the checkout link in that message doesn’t expire. Shopify’s abandoned checkout documentation says “You can’t disable or expire an abandoned checkout link after you send it.” For headless builds, Shopify’s Storefront API cart documentation says “Unused and abandoned carts automatically expire within 30 days of creation.”

The FTC’s September 2022 staff report, Bringing Dark Patterns to Light, lists “False Limited Time Message” as an urgency dark pattern: “Creating pressure to buy immediately by saying the offer is good only for a limited time or that the deal ends soon,” but “without a deadline or with a meaningless deadline that just resets when reached.” Connecting the two sources is our inference, not a legal finding. A text sent inside Klaviyo’s 48-hour window that says the cart is about to expire gives no deadline, and the platform doesn’t impose one. The staff report isn’t a rule, so treat this as a copy risk and write the reminder without the deadline.

False scarcity has the same problem. Klaviyo’s flow documentation suggests leading with “Hurry, before it sells out!”, and the FTC report lists “False Low Stock Message” as a scarcity dark pattern. Luo, Lu and Li found a price incentive 11.4 times more effective than a scarcity message at the cart stage, so scarcity is weak persuasion there, and false scarcity adds a risk on top. If stock really is low, say so and show the real count.

Shopify also sets one rule about the restore link: “Anyone who opens the abandoned checkout link can continue that checkout, so send the link only to the customer who abandoned it,” per its abandoned checkout documentation. Keep restore links out of anything that could be forwarded or shared, including support replies.

In the US, you get one cart text per shopper. Klaviyo’s US guidelines for SMS cart abandonment flows list five requirements and attribute them collectively to “the TCPA, CTIA, or carriers” without saying which rule comes from which. The five are:

The same page sets the cap at one SMS per recipient and the time limit at 48 hours. It also says “you cannot complete the transaction on behalf of the customer, collect payment information via text, or accept purchase via a keyword confirmation from the customer.”

The text also reaches fewer people than the email. Klaviyo doesn’t support SMS or mobile push marketing to profiles with a Never Subscribed consent status, and a cart text needs SMS consent specifically, so a shopper who only typed an email address at checkout can’t get the text. Klaviyo’s setup guide adds that “Unlike with email, an SMS doesn’t have a way to dynamically populate the exact number of items someone abandoned.” It recommends showing only the first cart item, and skipping the message if that product is unpublished.

Study 2 in the Journal of Marketing paper found the same early-backfire pattern for SMS reminders. Klaviyo’s guide says the time delay “must be within 48 hours of when the flow triggers” and calls quiet hours “highly encouraged for SMS abandoned cart reminders,” a setting that’s on by default. Smart Sending runs a separate window for each channel, with defaults of 16 hours for email and 24 hours for SMS, according to Klaviyo’s Smart Sending documentation.

We found no study comparing one text against a third abandoned cart email as the late touch, so where to spend the text is our call, based on those constraints. We put it at touch two, around a day after the trigger. That’s late enough to clear the first-hour window, inside the 48-hour limit, and earlier than day three, when the limit would rule it out anyway. Everyone without SMS consent stays on the email path, and the consent capture, sending numbers and double opt-in setup behind the text are covered in our SMS build for ecommerce brands.

Klaviyo and Shopify’s native automation start from opposite defaults. Klaviyo’s consent documentation says a Never Subscribed profile “has neither subscribed nor opted out of email marketing.” Such profiles “are able to receive emails since they are not suppressed (e.g., an abandoned cart flow email), but you should exercise caution when contacting them.” One of Klaviyo’s examples of how a profile ends up with that status is a shopper who entered their information at checkout without opting in to email marketing.

Shopify’s abandoned checkout automation page says “By default, the abandoned checkout automation is only sent to customers that are subscribed to email marketing,” and you can switch the To: field to All customers. Shopify’s marketing automations page documents that override for abandoned checkout, but not for the abandoned cart or browse automations.

Klaviyo files cart and browse abandonment as promotional messages in its transactional versus promotional guide, and its privacy best practices call these flows a “regulatory gray area.” The privacy page suggests either excluding customers in regulated areas or giving them messaging that “contains less marketing lingo,” and tells you to “contact your legal team.” Klaviyo’s flow documentation says that if you’ve got customers outside the US “and in a region with data protection laws, you should consult your legal team before turning your abandoned cart flow live.”

The same privacy page also makes a deliverability argument: “It’s important to not email customers who have not opted-in to your marketing as well as those who do not regularly engage with your brand to maintain good deliverability in the eyes of inbox providers.” Its consent page adds that “Klaviyo recommends that you only email profiles with express consent to protect your deliverability and sender reputation.”

Klaviyo will send to Never Subscribed profiles, and Shopify won’t by default. Whether you should depends on where your customers are and what your counsel says. BLKDG isn’t your counsel, and none of this is legal advice.

On the overlap, Klaviyo’s flow documentation says “You’ll want to turn off any default platform abandoned cart messages to prevent duplicating messages to customers.” Shopify’s abandoned checkout pages don’t mention third-party email apps or duplicate sends either way. If you leave both running on their defaults, our reading is that a subscriber gets two abandoned cart emails and a Never Subscribed shopper gets only Klaviyo’s.

Two Shopify details affect that decision. Its Messaging pricing page says abandoned checkout automations “are always free and don’t count towards the monthly limit” of 10,000 free emails on the Basic, Grow, Advanced and Plus plans, so the native option costs nothing to keep. Also, according to Shopify’s abandoned checkout automation page, activating the new automation “is a permanent change,” and you can’t go back to the legacy emails afterward.

This table puts the two defaults side by side, using the pages linked above:

For cart abandonment in Klaviyo, the vendor’s own advice is to start small: “We recommend setting up an email only abandoned cart flow first to make sure everything is set up properly.” Add the SMS branch once the email path works. Turn off Shopify’s native abandoned checkout emails before the Klaviyo flow goes live, as the flow documentation instructs.

Most of the work is in the filter: Klaviyo’s instruction is to “Configure the filter to check for Person has Placed Order zero times since starting this flow,” and “If you have more than 1 message in your flow, Klaviyo will check your profile filters before each individual email.” Klaviyo also suggests a has-not-been-in-this-flow filter set over hours, days or weeks, so a shopper who abandons again inside the window you set isn’t entered twice. Expect large skip counts. According to Klaviyo, “This is actually a good thing and simply means the flow is functioning correctly by not sending abandoned cart emails to people who placed an order.”

If you also run an Added to Cart flow, exclude anyone who has started checkout from it, so the checkout flow owns that shopper. That filter follows from the logic of running two tiers. Klaviyo’s Added to Cart guide says the pre-built flow comes with the recommended filters but doesn’t name this one for Shopify checkouts. The only started-checkout filter it lists is for merchants using Amazon Buy with Prime. The onsite tracking documentation also notes that the app embed “can only be associated with 1 Shopify store.”

For the content, save the dynamic blocks before editing, and put the final email’s incentive behind a conditional split for never-purchased profiles. Before launch, click the restore link from a second device: Klaviyo says only that “Some integrations allow you to rebuild a customer’s cart fully no matter which device they click the link from,” and doesn’t say which integrations do that across devices. According to its Smart Sending documentation, Smart Sending is enabled for flow messages in many pre-built flows and can be turned off for individual messages, so set it for each message rather than inheriting the default.

Black Friday is November 27, 2026, and your cart flow should keep running through it. Our Black Friday email and SMS plan makes the case for keeping it on, stripping or gating its incentive, and adding a profile filter. That post also covers the peak-season failures: Smart Sending collisions with campaigns, and cart emails that get skipped when a product in them sells out. It puts the last structural flow changes in the week of November 9, which leaves the rest of September and October for this checklist.

You built something worth finding. Someone found it, got all the way to checkout, and left.

If you want a second set of eyes on your abandoned cart email flow before peak traffic arrives, schedule a free Growth Audit, and we’ll review your flow’s timing, consent logic and discount rules while there’s still time to test changes. Not a sales call. Not a quote request. If the work turns out to be bigger than the audit, our email and SMS marketing services team can build it.