What should sellers check before committing stock to 11.11?

Model a realistic sell-through range (not just the best case), and check that unsold stock past the campaign is not dead capital in a category with thin margin. Compare it against your recent baseline sell-through, not the campaign's suggested target.

How much ad budget is safe to commit to a double-day campaign?

Cap it by the ROAS your margin can actually absorb, not by how much the platform lets you spend. A campaign-day ROAS that looks fine on GMV can still be unprofitable once real COGS, fees and voucher costs are subtracted.

Why can a campaign look profitable on GMV but hurt cash flow?

Settlement typically lags the order by days to weeks, so a spike in orders on campaign day does not turn into cash in your account on the same day — while ad spend, courier costs and voucher funding are often paid out much sooner.

Do vouchers and coins change the campaign profit math?

Yes — the seller-funded portion of any stacked voucher or coin deal is a real cost that should be modelled before the campaign, not discovered afterward. It sits on top of platform fees and COGS.

Should every SKU join the campaign?

No. SKUs with thin gross margin or uncertain COGS are the most likely to lose money once ad spend and voucher stacking are added; prioritise campaign slots and budget on SKUs with margin to spare.

The 11.11 Campaign Profit Checklist: What to Check Before You Commit Stock and Budget

Short answer: Double-day campaigns (9.9, 10.10, 11.11, 12.12) reward the sellers who check profit math before the campaign, not after. Stock, ad budget, voucher stacking, fulfilment capacity and cash-flow timing all move against you at once during a spike — a plan built only around a GMV target usually finds that out in the settlement, weeks later.

Campaign net profit = (Orders × margin after voucher stack) − incremental ad spend − campaign-specific ops cost

What should you check before committing stock to 11.11?

Model a realistic sell-through range for the campaign, not the best case the platform's projection tool shows you. Compare it against your own recent baseline — a category that normally sells 20 units a day rarely sells 20× that on campaign day just because it is discounted. Stock committed above realistic sell-through becomes dead capital sitting in a warehouse after the campaign, which is a cash-flow cost even before you count storage.

Check	Why it matters	Red flag
Sell-through vs baseline, not vs target	Campaign targets are aspirational, not a forecast	Committed stock assumes 5–10× normal daily sales
Reorder lead time vs campaign window	Running out mid-campaign loses ranking and ad spend already committed	Supplier lead time longer than remaining campaign days
Bundle/kit component stock	A bundle can only sell as fast as its slowest component	One component already low before the campaign starts
Voucher/coin stack cost per SKU	Seller-funded stack is a real cost on top of fees and COGS	Stack not modelled per SKU, only at shop level
Ad budget cap vs margin	Platform lets you spend more than your margin can absorb	Budget set by "what's available," not by breakeven ROAS
Courier/fulfilment capacity	Peak volume increases COD failed-delivery and late-dispatch risk	No plan for volume beyond normal daily packing capacity
Cash-flow timing	Settlement lags orders; spend often does not	No buffer between campaign spend and expected settlement date

How much ad budget is safe to commit?

Set the cap from your margin, not from how much budget the platform is willing to let you spend. Work out the ROAS at which this SKU breaks even after COGS, platform fees, and any voucher stack cost, then treat that as the floor — not the target. A campaign-day ROAS that looks acceptable against GMV can still be a loss once real costs are subtracted; see ROAS vs profit for the same trap outside campaign season, and GMV Max campaigns for automated-bidding-specific caveats.

Why does campaign-day profit look good but cash flow feels bad?

Settlement typically lags the order by days to weeks — see TikTok Shop settlement explained and Shopee escrow settlement explained for the mechanics. A spike in campaign orders does not turn into cash in your account on the same day, but ad spend, seller-funded vouchers and courier costs are often paid out much sooner. A campaign that is profitable on paper can still strain cash flow for weeks if you have not planned the timing gap, especially if you are also buying reorder stock at the same time.

Do vouchers and coins change the math?

Yes. The seller-funded slice of any stacked voucher or coin deal is a marketing cost that sits on top of platform fees and COGS, and it needs to be modelled per SKU before the campaign — not discovered in settlement. See vouchers, coins and stackable discounts for how to separate the platform-funded portion from what actually comes out of your payout.

Should every SKU go into the campaign?

No. Prioritise campaign slots, ad budget and voucher depth on SKUs with margin to spare. Thin-margin or COGS-uncertain SKUs are the ones most likely to flip negative once ad spend and voucher stacking stack on top of fees — running them at the same intensity as your best-margin SKUs is how a campaign that hits its GMV target still posts a disappointing net profit.

Run the numbers before, not after

The checklist above only works if it happens before you commit stock and budget, not while you are reconciling settlement weeks later. Use the profit margin calculator to sanity-check a SKU's breakeven point with your real COGS and expected voucher stack before the campaign goes live. Inseller was built by a seller who has run double-day campaigns on both platforms, to show real net profit per order and per SKU — including ad spend, voucher cost and settlement timing — so the post-campaign number does not come as a surprise.