Should I absorb shipping or pass it to the customer?
Absorbing shipping wins until passing it drops conversion past your break-even delta. Here is how to compute that number for your store and test it.
Last updated: June 27, 2026
Whether to absorb shipping cost or pass it to the customer comes down to one number: the conversion drop at which passing shipping erases more profit than absorbing it. Below that break-even drop, charge shipping and keep the margin. Above it, absorb shipping and treat it as marketing. Compute the number, then test it.
Most stores decide this on gut feel and a vague belief that free shipping lifts conversion. The lift is real, but it is not free, and it is not infinite. The honest version of this decision is arithmetic. You compare the direct margin you give up by absorbing shipping against the orders you lose by charging for it, and you find the exact conversion delta where the two paths cross.
The one-line verdict
Absorb shipping when passing it would drop your conversion rate by more than your break-even delta, and pass it when the expected drop is smaller. The break-even delta is the percentage conversion loss that makes both paths produce the same total profit. For most mid-margin ecommerce products it lands between 8 and 15 percent of your current conversion rate, which is a smaller cushion than most founders assume.
Absorb shipping cost or pass to customer: the two paths costed
Both paths cost real money. Absorbing shipping is a guaranteed hit to contribution margin on every order. Passing it is a probabilistic hit to conversion rate. The decision is which certain loss is smaller than which likely loss.
| Absorb shipping (free shipping) | Pass shipping (flat-rate or live rate) | |
|---|---|---|
| Who pays | You, every order | The customer, at checkout |
| Cost type | Direct, certain margin hit | Indirect, probabilistic conversion hit |
| Hits | Contribution margin per order | Orders per 100 sessions |
| Upside | Higher conversion, simpler checkout | Full margin on every order placed |
| Risk | Margin death by a thousand orders | Cart abandonment at the shipping line |
Contribution margin is the dollars left from a sale after the variable costs of that sale: product cost, payment fees, and shipping. Shipping as marketing means counting absorbed shipping as a customer-acquisition expense rather than a logistics line, because that is what it functions as when it lifts conversion.
The trap is treating the two paths as if only one has a cost. Founders who absorb shipping often never measure the margin bleed. Founders who pass it often never measure the abandoned carts. You need both numbers to choose well.
Worked example: a 32 ounce insulated water bottle at $35
Take a 32 ounce insulated water bottle that sells for $35. Here is the unit economics before any shipping decision.
- Price: $35.00
- COGS (product cost): $11.20
- Payment fees (2.9% + $0.30): $1.32
- Shipping cost to fulfill (zone-blended, 2 lb parcel): $7.10
- Duty line (imported stainless steel, blended landed duty already in COGS): $0.00 additional at sale
Path A: absorb shipping
You charge $35.00 and eat the $7.10 label.
- Revenue: $35.00
- Minus COGS: $11.20
- Minus payment fees: $1.32
- Minus shipping: $7.10
- Contribution margin per order: $15.38 left
Path B: pass shipping
You charge $35.00 plus a $7.10 flat shipping fee, so the customer pays $42.10. The payment fee rises because fees apply to the full charge: 2.9% of $42.10 plus $0.30 equals $1.52.
- Revenue collected: $42.10
- Minus COGS: $11.20
- Minus payment fees: $1.52
- Minus shipping: $7.10
- Contribution margin per order: $22.28 left
Passing shipping leaves $22.28 per order. Absorbing it leaves $15.38. The difference is $6.90 of margin per order, which is the price of free shipping on this bottle.
The break-even conversion delta
Now find the conversion drop where both paths produce the same total profit. Say absorbing shipping drives 100 orders out of some traffic. Passing shipping will convert fewer of those sessions because some customers abandon at the shipping line. The question is how many you can lose before passing becomes the worse choice.
Set the two paths equal. Absorbing earns 100 orders times $15.38, which is $1,538. Passing earns N orders times $22.28. Solve for the N where passing still beats absorbing:
- N times $22.28 = $1,538
- N = $1,538 divided by $22.28
- N = 69.0 orders
So passing shipping stays ahead of absorbing it until conversion falls below 69 of every 100 orders you would have gotten with free shipping. That is a 31 percent drop in conversion before the two paths tie.
The break-even conversion delta on this $35 bottle is 31 percent. If charging $7.10 shipping costs you fewer than 31 percent of your orders, passing shipping makes more total profit. If it costs you more than 31 percent, absorb it.
That delta is wider than most founders expect because the per-order margin gap is large relative to the order value. The cushion shrinks fast on thin-margin products. Re-run the same math with a 70 percent COGS product and the break-even delta can collapse into single digits, which is exactly when absorbing shipping quietly sinks the P&L.
How to find your own break-even delta
You do not need a model. You need five numbers and one division.
1. Pull your real per-order numbers
Get price, COGS, payment fees, and true blended shipping cost per order. Use your actual zone-blended label cost, not the cheapest zone. If you do not trust your shipping number, that is the first thing to fix, because every other figure here depends on it. See how to calculate your true net margin for the full per-order build.
2. Compute contribution margin for both paths
Absorb path: price minus COGS minus payment fees minus shipping. Pass path: (price plus shipping fee) minus COGS minus the higher payment fee minus shipping. The pass path almost always shows higher per-order margin, because the customer covers the label and you only lose the extra processing fee on the shipping amount.
3. Divide to get the break-even order count
Take your absorb-path total profit at 100 orders and divide by the pass-path per-order margin. The result is the number of orders you can keep on the pass path and still break even. Subtract from 100 to get your break-even conversion delta in percent.
4. Estimate your real conversion drop with an A/B test
Run free shipping against flat-rate shipping on the same product for two weeks, split by session. Measure the conversion-rate gap. Compare that measured drop to your break-even delta. If the measured drop is smaller than the break-even delta, charge shipping. If it is larger, absorb it. Now the decision is evidence, not folklore.
5. Re-check at every cost change
A carrier rate increase, a COGS jump, or a payment-fee change all move the break-even delta. Recompute whenever your input costs move more than a few percent, or the number you tested against quietly goes stale.
What it costs to skip this
Skipping the math defaults you to one of two silent leaks. Absorb everything without measuring and you can give away $6.90 per order on a product where customers would have paid the shipping without blinking, which on 4,000 orders a year is $27,600 of margin handed over for a conversion lift you never confirmed. Pass everything without measuring and you can lose more orders than the saved margin is worth, especially on impulse-priced items where the shipping line feels like a penalty. Either way, the cost of not knowing your break-even delta is a recurring tax you cannot see on any single order.
There is also the threshold option. A free-shipping minimum lets you absorb shipping only on orders large enough to carry it, capturing the conversion lift without the per-order bleed on small baskets. The free-shipping threshold that protects margin is its own calculation, and it often beats a blanket policy in either direction. If you suspect free shipping is already underwater on small orders, free shipping that is losing money shows how to spot it.
Where Agentis fits
Once you have a shipping policy, the risk shifts from choosing it to enforcing it. Promo codes stack with free shipping, oversized parcels blow past the label cost you modeled, and a single SKU's COGS creep can push a whole product below the break-even delta you set. Catching that in a month-end report is too late.
Agentis is a real-time profit governance platform for high-volume Shopify Plus and ShopLine merchants. It monitors margin at the order and SKU level and flags or blocks unprofitable activity before it reaches the P&L. Profit governance is the practice of monitoring and enforcing margin rules in real time across every order, SKU, and channel, so unprofitable activity gets caught and corrected as it happens instead of discovered in a month-end report. For the absorb-or-pass decision, that means the break-even delta you computed becomes a live guardrail instead of a spreadsheet you forgot to update.
Frequently asked questions
Should I absorb shipping or pass it to the customer?
Absorb shipping when charging for it would drop your conversion rate by more than your break-even delta, and pass it when the expected drop is smaller. Compute the break-even delta from your real per-order margins, then run a two-week A/B test to measure the actual conversion drop and compare the two.
What is the break-even conversion delta for shipping?
The break-even conversion delta is the percentage conversion-rate drop at which passing shipping and absorbing it produce the same total profit. You find it by dividing your absorb-path total profit by your pass-path per-order margin to get a break-even order count, then converting that to a percent drop. Above the delta, absorb. Below it, pass.
Does free shipping actually increase conversion?
Free shipping usually lifts conversion because the shipping line is a common cart-abandonment trigger, but the lift varies by product, price point, and audience, so treat any cited figure as unproven until you test it on your own store. The only number that matters for your decision is your measured conversion gap against your computed break-even delta.
Is a free-shipping threshold better than absorbing or passing everything?
A free-shipping threshold is often better because it absorbs shipping only on baskets large enough to carry the cost, capturing most of the conversion lift without the per-order margin bleed on small orders. The right threshold is a separate calculation tied to your average order value and contribution margin.
How often should I recompute the absorb-versus-pass decision?
Recompute whenever an input cost moves more than a few percent: a carrier rate increase, a COGS change, or a payment-fee shift all move the break-even delta. A policy that was correct at last quarter's costs can be wrong today, and the move is invisible on any single order.
Next step: pull your real per-order numbers for one product today, compute its break-even conversion delta with the division above, and schedule a two-week shipping A/B test to measure your actual drop against it.