How much can you actually pay to acquire a customer?

The most you can spend on acquisition is not a feeling. It's your contribution margin per order times your target payback, bounded by an LTV:CAC ceiling. Take the lower of the two. Answer a few questions and get your number, with both legs of the math shown.

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By Taylor Sicard · co-founded WIN Brands Group and scaled it to mid nine figures · the same per-order math behind brands taken from single-digit to nine-figure revenue, profitably

HOW MAX ALLOWABLE CAC IS CALCULATED

Max allowable CAC is the ceiling your margin structure can afford, and it has two legs. The payback leg is contribution margin per order times the number of months you will wait to recover the spend. The LTV leg is gross-margin lifetime value divided by your target LTV:CAC ratio, usually 3. Your ceiling is whichever leg is lower, and the leg that binds tells you which lever raises it.

Formula: max allowable CAC = the lower of (contribution margin per order x target payback months) and (gross-margin LTV divided by target LTV:CAC ratio).
Inputs: average order value, gross margin %, contribution margin per order %, lifetime orders per customer, target payback in months, target LTV:CAC ratio.
Healthy band: 3:1 on gross-margin LTV is the standard target and 3:1 to 5:1 the normal range. Payback under 6 months is healthy, under 3 is best-in-class, over 12 means you are financing your customers.
Note on the payback leg: it assumes roughly one contribution-positive order a month inside the payback window, so if customers reorder slowly, treat that leg as generous.
Common mistake: building the LTV leg on revenue LTV. You cannot spend revenue you never keep, so a revenue-based ceiling reads far more generous than it is.
Second common mistake: using platform-reported CAC. Real CAC includes agency fees, creative, and tools, so real payback is almost always longer than the ad account claims.

Worked example. AOV $80, gross margin 60%, contribution margin 35%, 2.5 lifetime orders, a 6-month payback target, a 3:1 ratio. Contribution per order is 80 x 0.35 = $28, so the payback leg is 28 x 6 = $168. Gross-margin LTV is 80 x 0.60 x 2.5 = $120, so the LTV leg is 120 / 3 = $40. The lower of the two wins: max allowable CAC is $40, and the LTV cap is what binds.

Source: Taylor Sicard, Taylor Sicard Consulting · Updated August 2026

The method behind the number

The per-order math that decides your ceiling.

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What can you actually pay for a customer?

Contribution margin times payback, capped by your cash position, which is what sets the ceiling.

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The max allowable CAC formula

The one-page formula, the LTV:CAC guardrail, and a worked example you can copy.

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Contribution margin for DTC

CM1, CM2, CM3 defined, and why the margin Shopify shows you stops two layers too early.

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CAC payback by vertical

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Method

How max allowable CAC is calculated

Two legs, take the lower. The payback leg: contribution margin per order times the months of payback you will accept. The LTV leg: gross-margin LTV divided by your target LTV:CAC ratio (3:1 is the standard). Whichever leg is lower is your ceiling, and the result shows which one is binding so you know which lever raises it.

Payback under 6 monthsHealthy. Under 3 is best-in-class and means you can compound spend fast.

Payback 6 to 12 monthsTight. Survivable with strong retention, dangerous if your LTV is built on hope.

Payback over 12 monthsYou are financing your customers. Growth is borrowing from profit.

The 3:1 guardrail is measured on gross-margin LTV, not revenue LTV, because you cannot spend revenue you never keep. Your AOV and margin carry into the revenue-leak calculator, and the DTC profitability calculator rebuilds the P&L this ceiling depends on. All eleven free DTC calculators share these benchmarks.

Questions

Common questions

What is max allowable CAC?

The most you can spend to acquire a customer and stay healthy. It is not a feeling: it is your contribution margin per order times your target payback window, capped by an LTV:CAC guardrail. Take the lower of the two and treat it as a ceiling, not a target.

What is the max allowable CAC formula?

Two legs. The payback leg: contribution margin per order times the months of payback you will accept. The LTV leg: gross-margin LTV divided by your target ratio (3:1 is the standard). Your max allowable CAC is whichever leg is lower. Spend above it and growth is borrowing from profit.

What LTV:CAC ratio should a DTC brand target?

3:1, measured on gross-margin LTV, not revenue LTV. Healthy brands run 3:1 to 5:1. Below 2:1 is rarely profitable after all costs, and far above 5:1 usually means you are under-investing in growth.

Why use gross-margin LTV instead of revenue LTV?

Because you cannot spend revenue you never keep. Revenue LTV counts dollars that go straight back out as COGS, fees, and fulfilment. Gross-margin LTV counts what is actually left to repay acquisition, so the ceiling it gives you is honest. On a revenue-LTV basis you would need closer to 5:1 or 6:1 to be as healthy as 3:1 on gross margin.

What is the average CAC for a DTC brand?

Averages are nearly useless here: CAC varies by category, AOV, and channel mix more than any average can capture. The better question is your ceiling. Work out the most your margin structure can afford, then judge your real blended CAC against that.

Does CAC include agency fees and creative costs?

It should. Real CAC is total acquisition spend, meaning ad spend plus agency fees, creative production, and tools, divided by new customers. Platform-reported CAC undercounts all of it, which is why real payback is almost always longer than it looks in-platform.