You're probably running H2 on numbers you set in January.
Here's the 3-metric recalc.
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You may have built your budget in January… but now it’s June. Landed costs have already shifted, fulfillment terms changed and churn has compounded.
The math running your campaigns right now is 6 months old.
Your dashboard reads profitable against numbers that don't reflect what your account is actually doing today.
Two things make this the right time to recalc:
1. Q2 books close June 30, the natural checkpoint for any operator running monthly P&L discipline.
2. Section 122 tariffs (the 15% surcharge imposed after the February SCOTUS ruling) expire July 24 by statute.
Both scenarios move break-even ROAS.
The recalc this week makes H2 decisions defensible regardless of which one lands.
Three numbers. 30 minutes per recalc.
Metric 1: Break-Even ROAS
Simplest of the three and fastest recalc. Sets the floor for everything else.
> The formula:
Break-even ROAS = 1 gross margin percentage
> Pull current per-unit gross margin (revenue minus COGS, before variable costs).
> Divide 1 by that number. Compare to the ROAS target on active campaigns.
Recalc if landed costs shifted more than 5% since January because gross margin moved and break-even ROAS moved with it.
The decision change when Break-Even ROAS moves:
50% gross margin to 45% gross margin moves break-even ROAS from 2.0 to 2.22, every campaign optimizing toward 2.0 is now losing 10 cents per dollar of attributed revenue.
For campaigns below the new break-even, pause or restructure.
For campaigns above new break-even but below old, continue and flag for H2 review.
Tariff scenario layer: Build two break-even ROAS scenarios for August.
• Scenario A: tariffs extend. Current break-even holds.
• Scenario B: tariffs lapse. For goods not covered by other existing tariff categories, landed costs shift toward 2024 levels and break-even ROAS drops.
Flag any campaign that fails either.
Metric 2: CAC Payback Period
Most operators track CAC. Far fewer track how long it takes to get that money back.
This is the metric that connects acquisition spend to real cash flow.
The audit:
> Pull new customer CAC from paid acquisition only (paid spend divided by new customers from paid channels) not blended CAC, which mixes in returning customers and makes numbers look more efficient than they are.
> Then pull cumulative contribution profit per customer at 30, 60, 90, and 120 days from your cohort data.
> Find the day count where cumulative contribution profit equals CAC.
That's your payback period.
Industry data says 90 to 120 days is a healthy payback window. Anything beyond 6 months starts putting real pressure on cash flow.
Higher-ticket categories like furniture and electronics can tolerate up to 12 months because margin per order is high enough to absorb the wait.
Categories with high repeat purchase rates compress the timeline.
The decision change when CAC moves:
If payback is 90 or more days and H1 cohort data shows concentrated churn in months 2 through 4, you're scaling acquisition into customers who leave before they pay back.
The H2 fix is retention investment (email flows, post-purchase sequences, winback campaigns), not more ad spend.
If payback is beyond 120 days, freeze acquisition scale-ups and redirect budget to retention first.
The cash-tied math: at $100K per month in acquisition spend with an 8-month payback, $800K of cash is tied up at any given time. Any H2 spend increases compound that number.
Metric 3: CM3 (Contribution Margin Per Order)
This is where most operators get it wrong.
Gross margin (the number most people look at) is revenue minus product cost.
CM3 is what you actually keep from each sale after paying for everything it took to fulfill and acquire that order, and running on gross margin as your profitability signal means working off an inflated number.
> The formula:
CM3 (post all variable costs) = Revenue – Product Cost – Shipping and Fulfillment
– Payment Processing – Returns – Allocated Ad Spend
The benchmark:
• 20 to 30% CM3 is the healthy DTC range.
• 25 to 35% is best-in-class.
• Below 20% means unit economics are broken before scaling enters the picture.
The recalc triggers:
• Shipping costs shifted, fulfillment changed terms, payment processing renegotiated, returns rate moved.
• Apparel return rates typically run 20 to 30%.
• Beauty runs 8 to 15%.
Any one of those moving changes your CM per order independently of product cost.
The decision change logic:
CM dropped and AOV held flat: that's an ops leak. Shipping, fulfillment, or returns are eating the margin. Audit operations before touching pricing.
CM dropped and AOV also dropped: that's an offer mix leak. Threshold bundles and AOV mechanics are the H2 fix, not cost renegotiation.
If CM3 is below your break-even threshold at current ROAS, you're scaling unprofitable orders.
Two fixes before increasing spend:
1. Raise AOV via threshold bundles. Fastest lever.
2. Lower variable cost via fulfillment or payment processing renegotiation.
Compounds over more orders.
How the 3 Numbers Chain
Break-even ROAS sets the profitability floor.
CAC payback tests whether acquisition spend has a return horizon at that floor.
Contribution margin diagnoses where the leak lives if either of the first two is broken.
Running them in isolation gives you three audits and no decisions.
Running them in sequence gives you one operating picture for H2.
The Decision to Run This Week
1. Recalc break-even ROAS: 1 divided by current gross margin. Compare to active campaign targets.
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2. Build two August scenarios: tariffs extend vs. lapse. Flag campaigns that fail either.
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3. Pull new customer CAC (paid-only) and 30/60/90/120-day cumulative contribution profit by cohort. Find payback day.
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4. Calculate CM per order with all variable costs. Compare to H1 average and break-even threshold.
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5. For each metric that moved more than 5% since January, identify the campaign decisions affected.
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6. Adjust spend, offer, or operations accordingly.
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7. Document the new numbers as your H2 baseline. Recalc again end of August.
Final Thoughts
Most accounts aren't running bad campaigns.
They're running good campaigns against the wrong numbers.
The cost of running on January math compounds every week the recalc gets skipped.
That gap won't show up in the dashboard right away.
It shows up in the bank account, 60 to 90 days later when the P&L doesn't match what the ad platform reported.
The recalc takes 90 minutes. Run it before H2 starts.
If you want a growth partner who is invested in helping you build a profitable business, someone who is going to push you to make changes that focus on profitable growth. Book a call - let’s chat.
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