Your average is hiding it. Split payback by channel and find the money-loser before you scale it.

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Two weeks ago this newsletter told you to recalc your payback window as one of three numbers running your H2.

Plenty of operators came up with one blended figure. The average looked fine and they decided to move on.

That blended number is exactly where the problem hides.

Here is how to find the channel that isn't paying you back, and set your scale ceiling off the real number instead of the average. Three steps, one spreadsheet.

Every channel you run carries its own margin profile and its own payback curve.

Meta cohorts, Google cohorts, and influencer cohorts do not behave alike after the first order.

One channel brings people back in 30 days. Another sends you buyers who never return.

Blend them into a single payback figure and a fast channel quietly funds a slow channel's dead cohorts.

You don’t see it happening because the average looks fine.

> Take your last 3 monthly cohorts and split the payback calc by channel. The single figure you computed two weeks ago is about to break apart into a fast lane and a slow one.

A $200 CAC with a 3-month payback beats a $50 CAC with a 12-month payback. Every time.

The cheap customer who never reorders is the expensive one.

You just don't get the invoice until month 12, long after you celebrated how low the acquisition cost looked.

This is why every "CAC is up, CAC is down" argument in your Slack misses the point.

The size of your CAC tells you what you paid. It says nothing about when you get it back, and after that span is the only time your bank account feels it.

> Re-rank your channels by payback window instead of CAC. Watch the order flip, then notice which "cheap" channel just dropped to the bottom.

For a reference line, here is roughly where payback sits by category:

- Food and beverage: 1 to 3 months

- Beauty and pet: 2 to 4 months

- Subscription boxes: 1 to 4 months

- Supplements, fashion, home goods: 3 to 6 months

- Electronics: 6 to 12 months or more

Under 6 months is excellent for most DTC.

Under 12 is workable.

Past 12 and you need outside capital, exceptional retention, or unusually fat margins to scale without choking on cash.

Notice where subscription boxes land on that list. That is no coincidence. The second order shows up in 30 days instead of 12 months, compressing payback by 40 to 60% against a one-time purchase even with the same CAC.

> Put your slowest channel against your vertical's line, not against your own blended number. That comparison tells you whether the channel is actually broken or just normal for your category.

The standard mistake is waiting a full year to judge whether a batch of customers was worth acquiring. By then the budget’s already spent.

You can see the shape far earlier than that.

Plot cumulative contribution per order for each monthly cohort, then line every cohort up at the same age and compare. A cohort tracking behind the ones before it at months 2 and 3 is already showing you its trajectory.

That early gap is data. Don't wait for it to close on its own.

Make the cohort prove it recovers instead of assuming it will catch up. Catch a weak cohort at month 2 and you stop scaling into it ten months earlier than you would have otherwise.

> Stack your last 6 cohorts on one chart at same-age intervals. Find the one bending under the rest and flag it before you raise its budget again.

Payback times monthly burn equals the working capital you need to scale.

A 9-month payback at $50K a month in spend ties up $450K before a single cohort prints a dollar of profit. Push spend higher and that float compounds with it.

Your scale ceiling is not set by your best channel. It is set by your slowest one, because that is the channel whose cash takes the longest to come home.

The slow channel decides how much capital you have to float, and floated capital is capital you can't put back to work.

> Run the multiplication on your slowest channel's payback at current spend. That number is what scaling costs you in float, today, before you add a dollar.

1. Pull contribution margin per order. If you already did this two weeks ago, reuse it.

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2. Build the payback curve on your last 3 monthly cohorts.

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3. Split that curve by channel.

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4. Compare your slowest channel to your vertical's benchmark line.

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5. Set your scale ceiling off the slowest channel, not off the blend.

You don't die from high CAC.

You die from cash running out before LTV catches up to it.

So the decision is not whether your CAC is too high.

It is which channels earn the next dollar of scale, and you decide that on one thing: when the dollar comes back.

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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