Set your Black Friday discount from the profit you need to keep, not from a competitor’s percentage. For every product, calculate the discounted sale price, subtract product cost, marketplace or payment fees, fulfilment, packaging, shipping support and expected advertising cost, then reject any offer that falls below your minimum profit. In 2026, Black Friday is November 27 and Cyber Monday is November 30, so early October is the right time to set those limits.
Start with the free Discount & Sale Price Calculator. It shows the sale price, buyer saving, estimated profit and the theoretical break-even discount. Then refine the result for percentage-based fees using the method below.
Why 2026 discounts need a profit plan
Adobe’s September 28, 2026 holiday forecast estimates that U.S. online sales will reach $275.1 billion from November 1 through December 31. It projects $47.5 billion during Cyber Week, including $12.9 billion on Black Friday and $15.1 billion on Cyber Monday. Adobe also expects advertised discounts to reach as much as 30% in some categories during Cyber Week.
Those figures show strong deal demand, but they are a U.S. market forecast—not a promise that a particular store, marketplace or product will sell. A small seller trying to copy a 30% headline without checking costs can win revenue and still lose cash. Your useful number is the maximum discount for each SKU.
The four numbers to calculate before choosing a discount
- Regular selling price: the genuine price used before the promotion, not an inflated comparison price.
- Fixed variable costs: product cost, inbound freight, packaging, pick-and-pack charges, shipping subsidy and any fixed per-order fee.
- Percentage costs: marketplace, payment or affiliate fees calculated on the actual discounted transaction.
- Minimum profit: the dollar amount you still want one discounted order to contribute after those costs.
If you do not yet know your normal margin, run the item through the Profit Margin Calculator first. Use current costs rather than the amount paid for an old batch if the next batch will cost more.
Black Friday discount formulas
The basic sale-price formula is:
Sale price = regular price × (1 − discount percentage)
Profit per discounted order is:
Profit = sale price − fixed variable costs − percentage fees
If all costs can be expressed as fixed dollars, the break-even discount is:
Maximum break-even discount = (regular price − all-in cost) ÷ regular price × 100
Break-even is a warning line, not a recommended offer. It leaves no contribution for overhead, returns or owner pay. A safer limit protects a target profit:
Maximum discount = 1 − ((fixed costs + target profit) ÷ regular price)
When a platform charges a percentage fee on the discounted price, divide the required net revenue by one minus the fee rate:
Required sale price = (fixed costs + target profit) ÷ (1 − fee rate)
Worked example: 25% versus 35% off
Assume a product normally sells for $80. Product cost is $24, the seller contributes $6 toward shipping, packaging costs $2 and expected advertising cost is $5 per order. The platform and payment fees equal 12% of the discounted selling price.
| Measure | 25% off | 35% off |
|---|---|---|
| Sale price | $60.00 | $52.00 |
| 12% fee | $7.20 | $6.24 |
| Other variable costs | $37.00 | $37.00 |
| Profit per order | $15.80 | $8.76 |
| Margin on sale price | 26.3% | 16.8% |
The headline discount increases by ten percentage points, but profit per order falls by $7.04, or almost 45%. If the seller requires at least $12 profit, the required sale price is ($37 + $12) ÷ 0.88 = $55.68. Against an $80 regular price, the deepest acceptable discount is about 30.4%.
This is why the calculator’s result should be treated as a first pass when percentage fees apply: calculate the fee from the proposed sale price, add it to the cost field, and rerun the numbers. Marketplace sellers can also use the matching SellersNest fee calculator for their platform.
Choose the offer structure that fits the stock
Shopify’s 2026 BFCM guidance identifies storewide discounts, spending tiers and selected-product offers as common structures, and recommends matching the structure to margins and inventory. For most smaller sellers, one blanket percentage is the least precise choice.
Use SKU-level discount bands
- High margin and overstocked: the strongest discount can create a clear campaign hook.
- Healthy margin and normal stock: use a moderate discount or bundle to protect contribution.
- Low margin or scarce: exclude it, reduce the discount or use it as a full-price add-on.
- Old or storage-heavy stock: accept a lower profit only when the carrying-cost saving justifies it.
For ageing inventory, compare the cost of holding the item with the cost of clearing it. The earlier guide on how deep you can discount explains the break-even line; this BFCM plan adds fee-adjusted target profit, inventory tiers and event timing.
Use thresholds to grow the basket
“Spend $100, save $15” can preserve more margin than 15% off every order because the customer must first reach the threshold. Set the threshold slightly above current average order value, then check whether the extra gross profit covers the reward. Use the average order value guide to establish the baseline.
Bundle complementary products
Bundles can raise order value and spread packaging or fulfilment costs across more units. Do not assume a bundle is automatically profitable: calculate the combined product cost, the actual shipping weight and the discount on the whole set.
Protect profit from costs sellers often miss
- Returns: holiday gifts may be returned after the campaign; include expected reverse-shipping, processing and write-down costs. The Return & Refund Cost Calculator can estimate the exposure.
- Paid acquisition: higher ad auctions can make a previously profitable offer unprofitable.
- Free-shipping thresholds: model the seller-funded amount and possible remote-area or oversized charges.
- Affiliate and creator commissions: include them when the promoted order is eligible.
- Tax treatment: sales tax or VAT rules differ by location and platform; do not count tax collected for authorities as revenue.
- Extra labour: temporary packing help, inserts and rush handling belong in campaign costs.
A practical 2026 BFCM preparation calendar
October 2–18: set the financial guardrails
- Update costs for every promoted SKU.
- Set minimum profit and maximum discount.
- Classify stock by margin, age and quantity.
- Confirm supplier lead times and available fulfilment capacity.
October 19–November 8: build the offer
- Select storewide, tiered, bundle or SKU-specific discounts.
- Prepare sale collections, product copy, email and social assets.
- Check mobile product pages, shipping promises and return terms.
November 9–22: test the full order path
- Test discount codes, stacking rules, checkout and tracking.
- Place a test order and verify the post-discount fee calculation.
- Set stock buffers. The Inventory Reorder Point Calculator helps identify products that should not be promoted aggressively.
November 23–30: monitor contribution, not revenue alone
Track orders, conversion rate, average order value, ad cost, refund signals and profit per order. Pause a popular offer if stock or fulfilment risk becomes unsafe. A campaign that sells out the wrong SKU at an inadequate margin is not automatically a success.
Frequently asked questions
When are Black Friday and Cyber Monday in 2026?
Black Friday is Friday, November 27, 2026. Cyber Monday is Monday, November 30, 2026. Many stores begin promotions earlier, so state the exact start, end, exclusions and time zone in customer-facing copy.
Is 30% off necessary for Black Friday?
No. Adobe forecasts discounts of up to 30% in some U.S. categories during Cyber Week, but that is market-level evidence, not a required discount. A smaller offer, bundle, gift-with-purchase or threshold discount may be more profitable for your products.
Should I discount every product?
Usually not. Exclude low-margin, scarce or already fast-selling products unless they support a deliberate basket-building strategy. Put the strongest offers on products with enough margin and inventory.
How do marketplace fees affect the maximum discount?
Percentage fees usually fall as the sale price falls, but fixed fees and product costs do not. Calculate fees from the discounted transaction, then include them in the order-level profit test.
Can I run a loss leader?
Yes, if the expected profit from the rest of the basket or later purchases exceeds the controlled loss and you can measure that result. Set quantity limits and a total campaign loss ceiling before launch.
What should I measure after BFCM?
Measure profit per order, total contribution, average order value, conversion rate, ad cost, return rate, new-customer rate and remaining inventory. Revenue alone cannot show whether the promotion created value.
Sources and scope
Forecast figures were checked on October 2, 2026 against Adobe’s 2026 U.S. holiday ecommerce forecast. Offer-structure and preparation guidance was checked against Shopify’s 2026 BFCM checklist. Forecasts describe broad markets and do not guarantee traffic, conversion or profit for an individual seller.