TL;DR
- Build the budget from contribution margin and allowable CAC, never from a revenue percentage.
- Allowable CAC equals AOV times contribution margin, extended by repeat orders inside your payback window.
- Stop scaling a channel when its marginal CAC crosses the ceiling, not when blended ROAS dips.
- Retention spend across the market fell 29% since 2024, which makes it the cheapest arbitrage on the board.
How do you allocate a marketing budget for a DTC brand?
Work out allowable CAC first: AOV times contribution margin, extended by repeat orders inside your payback window. Multiply your target CAC by the new customers you want to get the acquisition budget. A common split on a $100,000 month is 60% prospecting, 12% retargeting, 12% creative, 10% retention, 6% testing.
What is a good marketing budget percentage for eCommerce?
Most DTC brands land between 15% and 30% of revenue, driven by contribution margin and repeat rate. Gartner's 2026 benchmark of 7.8% of revenue describes enterprises above $1 billion and does not transfer to a Shopify P&L. Derive the percentage from allowable CAC rather than setting it first.
When should you stop increasing ad spend on a channel?
Stop when the marginal CAC of the last budget increment crosses your allowable CAC ceiling. Step budget up in 20% increments and read new-customer CAC per step. A campaign averaging a 2.6 ROAS can still be buying its final $10,000 of customers at $71 against a $43 target.
Most marketing budget allocation advice starts with a percentage of revenue. Gartner's 2026 CMO Spend Survey puts the average at 7.8% of company revenue. That number comes from 401 CMOs, and the vast majority of them run companies above $1 billion in revenue. If you sell candles or creatine on Shopify, it tells you almost nothing.
A DTC budget is built from the bottom up, off unit economics. Your contribution margin sets a ceiling on what a customer can cost. That ceiling sets your acquisition spend. What's left funds the things that make the acquisition spend work harder.
This post gives you the arithmetic, a worked allocation on a $100,000 monthly budget, and the triggers for moving money before the quarter ends.
What should my marketing budget be?
There's no safe percentage. A brand at 70% contribution margin and a 2.3x repeat rate can spend triple what a 35%-margin brand spends on the same AOV and still bank profit.
Start with one question: what can a new customer cost before the order stops being worth having? Everything downstream is a consequence of that answer.
Gartner's 7.8% benchmark describes enterprise marketing departments carrying brand, PR, events, research and a payroll line. Your Shopify P&L looks nothing like that. Most DTC brands we work with land somewhere between 15% and 30% of revenue on marketing, and the spread inside that range is driven by margin and repeat rate rather than by ambition.
The percentage is an output. Run the math, land on a spend number, then divide it by revenue if your board wants a percentage for the deck. Don't run it the other way around.
Start with contribution margin, not a revenue percentage
Contribution margin is what's left from an order after the costs that scale with it: COGS, shipping, payment processing, pick and pack, returns. It excludes ad spend. That exclusion is the point, because contribution margin is the pot ad spend gets paid out of.
Take an $80 AOV at 55% contribution margin. Each first order contributes $44. If you want every order to pay for itself immediately, $44 is your allowable CAC and 1.82 is your break-even ROAS.
Most brands can afford to wait longer than one order. If a cohort places another 0.4 orders inside 90 days, the 90-day contribution is $61.60. That's your allowable CAC on a 90-day payback.
Now leave yourself profit. Target 70% of the ceiling and you get a $43 target CAC. Multiply by the new customers you want and the acquisition budget falls out of the arithmetic. 1,400 new customers at $43 is $60,200 a month.
Run your own numbers through our contribution margin calculator and CAC payback period calculator before you set any channel budget.
"Marketing budgets rose only slightly to 7.8% of company revenue in 2026 from 7.7% in 2025." — Gartner, 2026 CMO Spend Survey
What is the 70/20/10 rule for marketing budget?
The 70/20/10 rule puts 70% of budget into proven channels, 20% into channels showing early promise, and 10% into untested bets. It's a sensible default for a marketing department with a wide channel surface.
For DTC it needs amending, because the rule treats every dollar as media. On a Shopify P&L, creative production and email infrastructure aren't experiments. They're the cost of making media work at all.
We split five ways instead: prospecting, retargeting, retention, creative, and a testing reserve. Prospecting and retargeting behave like the 70. Creative and retention behave like fixed infrastructure. The reserve is the 10, and it's the first thing brands raid when a month goes sideways, which is exactly why it should be ring-fenced in the plan.
If you're rebuilding from scratch, our guide to pacing your ad spend covers how to phase these buckets across a month without front-loading yourself into a mid-month freeze.
| ✅ Do | ❌ Don't |
|---|---|
| Set the budget from allowable CAC and contribution margin | Copy a revenue percentage from an enterprise benchmark report |
| Read marginal CAC per budget increment | Judge a channel on blended account ROAS |
| Cap retargeting at roughly 15% of paid budget | Let retargeting grow because its ROAS looks the best |
| Fund creative production as fixed infrastructure | Treat creative as an expense to cut when a month goes sideways |
| Write reallocation triggers with real numeric thresholds | Wait for the quarterly review to move money |
Split the paid bucket by marginal return, not platform loyalty
Blended ROAS hides the only number that matters when you're deciding where the next dollar goes. What you need is marginal CAC: what the last increment of spend cost per new customer, not the average across the whole budget.
A Meta prospecting campaign averaging a 2.6 ROAS at $30,000 a month might be delivering new customers at $38 on the first $20,000 and $71 on the last $10,000. The average looks fine. That last tranche is underwater against a $43 target, and it's invisible in the platform dashboard.
Test it by stepping budget in 20% increments and reading new-customer CAC per step rather than account ROAS. When a step's marginal CAC crosses your ceiling, that channel is full. Move the increment to whichever channel still has headroom below the line.
This is also how you settle Meta-versus-Google arguments without anyone raising their voice. Whichever platform has the lower marginal CAC at the margin gets the next dollar. Our MER calculator and Meta ads management work both key off this logic, and how much to spend on Google Ads applies the same test to search.
Fund retention before you open another acquisition channel
One number should reshape your allocation. Gartner found that awareness and conversion now take 62.6% of total media spend, while spend on customer loyalty and retention has dropped 29% since 2024 to under 15%. Gartner's own read is that the most AI-mature organizations are doing the opposite and putting more into retention.
The binary is false anyway. Klaviyo's 2026 benchmarks, drawn from more than 183,000 brands, show email flows producing 41% of total email revenue off 5.3% of sends, and nearly 48% of that flow revenue comes from new buyers rather than repeat ones. Your welcome and abandonment flows are an acquisition channel wearing a retention badge.
In our experience scaling DTC brands, this is the highest-return reallocation available. For a supplements client spending roughly $120,000 a month, we moved about 12% of paid budget into Klaviyo flow rebuilds and creative. Blended MER went from around 2.4 to 3.1 inside a quarter, and paid ROAS on the smaller budget barely moved.
Ten percent of total budget into Klaviyo email and SMS is a floor, not a stretch.
"Email flows generate nearly 41% of total email revenue from just 5.3% of sends." — Klaviyo, 2026 Email Marketing Benchmarks
A worked allocation on $100,000 a month
Same brand: $80 AOV, 55% contribution margin, $43 target CAC, 1,400 new customers a month.
| Bucket | Monthly | Share | What it buys |
|---|---|---|---|
| Prospecting | $60,000 | 60% | Roughly 1,400 new customers at a $43 target CAC |
| Retargeting | $12,000 | 12% | Lower-funnel capture, capped before it cannibalizes |
| Retention | $10,000 | 10% | Klaviyo platform, flow builds, SMS |
| Creative | $12,000 | 12% | Static and video volume to feed prospecting |
| Testing reserve | $6,000 | 6% | One new channel or offer, ring-fenced |
Retargeting is capped deliberately. Past roughly 15% of paid budget it mostly buys conversions you'd have got anyway, and it flatters blended ROAS while doing it.
Creative sits at 12% because creative volume is what caps Meta scale, long before budget does. Starve it and the prospecting bucket decays within about six weeks.
The reserve is small enough that losing it entirely costs you 6% of a month. That's the price of finding next year's main channel.
"Retargeting past 15% of paid budget mostly buys conversions you were going to get anyway, and it flatters your blended ROAS while doing it." — Top Growth Marketing
When to reallocate mid-quarter
Quarterly planning with monthly reads is the wrong cadence for paid. Costs move weekly. Set triggers in advance so reallocation is a rule rather than an argument.
Four that earn their place:
- Marginal CAC on any channel exceeds allowable CAC for two consecutive weeks. Cut that channel's increment, move it to the next-best marginal CAC.
- Blended MER drops more than 15% week over week with flat spend. Check tracking before you touch budget. Broken attribution looks identical to a performance drop.
- New-customer share of revenue falls below 50%. You're buying your existing list. Shift spend from retargeting to prospecting.
- Creative frequency passes 3.0 on prospecting. You have a supply problem. Move money into production.
Write the triggers into the plan with the numbers filled in. A trigger without a threshold is a conversation, and conversations lose to whoever spoke last.
The TGM Take
The consensus right now is to push budget toward acquisition because retention compounds too slowly to rescue this quarter. The market has acted on it: loyalty and retention spend is down 29% since 2024 and now sits under 15% of media budgets.
That's a mistake for DTC specifically, and the reason is arithmetic rather than philosophy. Retention spend raises the repeat rate inside your payback window, which raises allowable CAC, which lets prospecting bid higher and buy more customers. Underfunding email and SMS lowers the ceiling on every acquisition channel you own.
Treat 10% of total budget into owned channels as a floor. It's the only line item that makes the other lines cheaper.
— Jack Paxton, Founder, Top Growth Marketing
Conclusion
Three things carry most of the weight here. Contribution margin sets your allowable CAC and therefore your entire budget, so it comes before any channel decision. Marginal CAC tells you where the next dollar belongs. Blended ROAS will never show you that. And retention is currently the cheapest place to buy revenue, because most of the market has spent two years walking away from it.
Build the model once, write the reallocation triggers down with real thresholds, and the quarterly budget meeting becomes arithmetic rather than advocacy.
If you'd like a second pair of eyes on the split, book a growth marketing strategy call and we'll run your numbers with you.
Frequently Asked Questions
What percentage of revenue should a DTC brand spend on marketing?
There's no universal figure. Gartner's 2026 benchmark of 7.8% describes enterprises above $1 billion in revenue. Most DTC brands land between 15% and 30%, driven by contribution margin and repeat rate. Calculate allowable CAC first and derive the percentage from the resulting spend.
How do I calculate allowable CAC?
Multiply AOV by contribution margin percentage to get contribution per first order. Extend it by the repeat orders a cohort places inside your payback window. An $80 AOV at 55% margin contributes $44 on order one, or $61.60 over 90 days at 0.4 repeat orders.
What is the 70/20/10 rule for marketing budget?
It allocates 70% to proven channels, 20% to emerging ones, and 10% to experiments. For DTC we use five buckets instead, because creative production and email infrastructure are operating costs rather than experiments and get starved under a three-bucket split.
How much of my budget should go to retention?
Ten percent of total marketing budget is a sensible floor for email and SMS. Market-wide, retention spend fell 29% between 2024 and 2026 to under 15% of media spend, which makes it unusually cheap relative to the revenue it produces.
How often should I reallocate marketing budget?
Review weekly against pre-set triggers and rebalance monthly. Quarterly is too slow for paid social, where auction costs and creative fatigue both move inside a fortnight.
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