Good ecommerce budget allocation starts with one question: which dollar, spent where, returns the most profit in the next 90 days? Set a total from revenue and margin. Split it into acquisition, conversion, retention and creative. Hold a slice back for testing. Then move money every month toward what the numbers support, not toward what feels busy.
This guide is written for Australian store owners who already sell online and want to scale. It gives you a method, a worked example and the traps we see most often.
TL;DR
- Work backwards from profit: gross margin and break-even ROAS decide how much you can spend, not a generic percentage of revenue.
- Split spend across four buckets: paid acquisition, conversion (site and offers), retention (email and SMS), and creative. Keep 10 to 15% as a test fund.
- Fix conversion before you pour more money into traffic. A leaky site makes every ad dollar cost more.
- Treat ad spend and site builds differently for tax, and keep records of each. The ATO draws that line.
- Review monthly, reallocate quarterly, and only move money on evidence from at least one full buying cycle.
Table of Contents
- Why the market makes this decision urgent
- Start from margin, not from a percentage
- The four buckets
- A worked example
- How the split changes by stage
- Tax: treat the buckets differently
- Perspective: what we see when stores come to us
- Where we can help
- A review rhythm that keeps the budget honest
- Common allocation mistakes
- FAQ
- Sources
Why the market makes this decision urgent
Australians keep shifting spend online. The ABS reports online retail sales of $4,703.8m in June 2025, in seasonally adjusted terms. Australia Post’s latest report notes that shoppers were budget-conscious in 2025, buying smaller baskets more often.
Smaller baskets and more frequent orders change your maths. Customer acquisition costs rise against lower order values, so repeat purchase and conversion carry more of the load than they did a few years ago.
Advertisers are moving too. IAB Australia reports that internet advertising reached $17.2bn in FY25, up 10.6% on the year before. Its 2026 retail and commerce media survey found that 68% of brands plan to increase onsite and 63% offsite media spend. The same report puts roughly 47% of that investment down to reallocation from traditional advertising or trade budgets, so competitors are not only spending more, they are moving money toward channels with faster transaction feedback.
Start from margin, not from a percentage
Most budget articles open with a rule of thumb: a fixed share of revenue goes to marketing. It is a fine sanity check and a poor decision tool. Two stores turning over $1.5 million a year can have gross margins of 30% and 65%, and they cannot afford the same ad spend.
We lay out why a single headline figure misleads in our piece on the ecommerce marketing budget. The short version is below.
Step 1: Work out contribution margin per order
Take the average order value and subtract product cost, shipping, payment fees, packaging and expected returns. What remains is what an order can give to marketing and profit.
Step 2: Find your break-even ROAS
Break-even ROAS is 1 divided by your contribution margin before ad costs, expressed as a ratio. If an order leaves you 40% after product, shipping, fees and returns, break-even is 2.5. Below 2.5, each ad dollar loses money on the first order. Above it, you make a margin on the first sale before any repeat purchase.
Step 3: Set the ceiling and the floor
The ceiling is the most you can spend at your current break-even and still stay in profit. The floor is the minimum needed to gather learnable data, since ad platforms need a steady flow of conversions to optimise. A store that spends a few hundred dollars a month across five channels learns nothing from any of them.
If you want the measurement side in depth, our guide to ecommerce performance metrics covers which numbers to track, and the explainer on cost per acquisition shows how to set a target CPA that matches your margin.
The four buckets
We sort every dollar into one of four buckets. The split below is a starting framework, not a universal law. Your margin, stage and product decide where you land.
| Bucket | What it covers | Typical starting share for a growth-stage store |
|---|---|---|
| Paid acquisition | Google, Meta, Pinterest, TikTok | 45 to 55% |
| Conversion | Site improvements, landing pages, offers, CRO testing | 15 to 20% |
| Retention | Email and SMS, flows, loyalty | 10 to 15% |
| Creative and content | Video, static ads, photography, copy | 10 to 15% |
The shares are our working ranges for planning, not an industry statistic, and they sit on top of a test fund (see below). A new store with no customer list will lean heavier on paid and creative. A store with 20,000 past buyers should move more toward retention, because that audience costs far less to reach.
Paid acquisition
This is the bucket most owners over-fund. Paid traffic is the quickest lever, so it tempts you to keep adding. But it is also the most sensitive to everything downstream: site speed, offer, product page quality and checkout friction.
Within acquisition, split by intent. Search and shopping capture people already looking, which is why Google Performance Max often earns the first dollars for a store with a decent product feed. Social channels create demand and reach people who did not know they wanted your product. Our overview of paid ecommerce channels explains which channel fits which stage. If you are weighing Meta, our page on Facebook advertising shows how we run it.
A workable first split for a store with a proven product: put most of the acquisition budget on one capture channel and one demand channel, and test a third only from the test fund.
Conversion
Conversion spend is the least glamorous and often the highest return. If your site converts at 1.5% and a round of fixes lifts it to 2%, you get a third more orders from the same traffic and the same ad bill. Product page content, shipping thresholds, trust signals, mobile checkout and page speed are the usual places to start.
Benchmarks help you see where you stand. Our breakdown of ecommerce conversion benchmarks and revenue per visitor argues that revenue per visitor tells you more than conversion rate alone, because average order value moves too.
Retention
Email and SMS are the cheapest revenue you will buy, but only if you build flows: welcome, abandoned cart, post-purchase, win-back. Because baskets are smaller and orders more frequent, a good post-purchase sequence is worth real money.
Compliance is part of the budget. The OAIC stresses that direct marketing by SMS and email must follow the Spam Act and privacy rules, and it has acted before: in the Organica and Brygon enforceable undertaking, the company acknowledged breaches of both the Privacy Act and the Spam Act. Before you scale a list, read our three Spam Act rules for email senders and our pre-send SMS compliance checklist.
Creative and content
Creative is where many stores under-spend. Ad platforms now do much of the targeting, so the creative is the main thing you control. A store spending $20,000 a month on ads with weak creative will usually get less than one spending $15,000 on ads and $5,000 on better video and static work. We cover the logic in why ad creative quality affects ROAS and show what good looks like in high-ROAS ecommerce ad examples.
A worked example
The numbers below are illustrative, to show the method. They are not client results.
Imagine an Australian homewares store with $1.8 million annual revenue, a 55% gross margin, and a target to reach $2.6 million in 12 months.
- Margin check. After shipping, payment fees and returns, contribution margin is 38%. Break-even ROAS is about 2.6.
- Total budget. The owner sets marketing at $270,000 for the year, which is 15% of current revenue. That is above a typical rule of thumb because the goal is growth, and it is justified only because the margin supports it. Monthly: $22,500.
- Test fund. 12% of the monthly budget, $2,700, is ring-fenced for new channels, creative formats and offers.
- Remaining $19,800 split. Paid acquisition 50% ($9,900), conversion 18% ($3,564), retention 12% ($2,376), creative 20% ($3,960) as the store is launching a new range and needs fresh video.
- Triggers. If blended ROAS stays under 2.6 for two weeks on a channel, pause increases. If it clears 3.5 for four weeks, raise that channel by no more than 20% at a time.
The 20% cap matters. Large jumps reset learning on most ad platforms and make it impossible to tell whether results changed because of the budget or the creative.
How the split changes by stage
Launching
You have no data, no list and no reviews. Put the larger share into creative and one acquisition channel, and invest in a clean site before traffic. Our launch strategy workshops are built for this moment.
Growing
You have a winning product and a break-even you understand. Raise the paid share carefully, add a second channel, and build retention flows so the extra customers come back.
Optimising for exit or profit
If you plan to sell the business in a few years, a buyer will look at margin, repeat rate and channel diversity. Shift weight toward retention and owned channels, and make sure your reporting is clean enough to withstand due diligence.
Tax: treat the buckets differently
The ATO says you can claim a deduction for most business expenses that meet its three golden rules: the expense must be for your business, you must have a record, and it must be money you spent. Ongoing ad spend is generally an operating expense. A major website build or custom software can be treated differently, and may need to be depreciated rather than deducted at once.
Practical consequence: track ad spend and site-build costs in separate accounts from day one. The ATO’s business deductions page sets out what is claimable. Confirm the treatment of any large build with your accountant or registered tax agent before you commit it to the plan.
Perspective: what we see when stores come to us
We rarely meet a store with a traffic problem alone. More often the budget is out of proportion: 80% on ads, almost nothing on the site, an email list that sends one newsletter a month, and creative that has not changed in a quarter.
Our view is simple. Allocate to the weakest link in the chain, not the loudest one. If the site converts poorly, the next dollar belongs in conversion. If the site is solid and flows are live, the next dollar belongs in acquisition. That is why our work starts with data and with senior strategists working directly with the owner, not with a channel pitch.
We also push owners to write down the rule before they spend: what result lets a channel earn more money, and what result takes money away. Budgets drift when the rules live in someone’s head.
— Liza
Where we can help
If you want the allocation done with you rather than for you, our 12 Week DOUBLE Your Revenue Challenge walks through margin, channel mix and conversion with a senior strategist. If your main issue is turning existing traffic into orders, start with Convert More Customers. Prices are not published, so get in touch through the Moor Marketing site to discuss which fits your store.
A review rhythm that keeps the budget honest
- Weekly: check spend pacing, blended ROAS and any channel that has broken its trigger.
- Monthly: compare actual split to planned split. Move test-fund winners into the main budget.
- Quarterly: reset the buckets using margin, return rates and repeat purchase data. Our 90-day data-driven marketing plan covers fixing match rates so the numbers you review can be trusted.
One caution on attribution: platform dashboards over-claim. Judge channels on blended results, meaning total revenue against total spend, alongside platform figures, before cutting a channel that quietly feeds the others.
Common allocation mistakes
- Copying a competitor’s percentage. Their margin, stage and repeat rate are not yours.
- Spreading too thin. Four channels at $1,500 each learn slower than two at $3,000.
- Funding ads before the site is ready. Fix the product pages and checkout first.
- Ignoring returns. A 3.0 ROAS can be a loss if a quarter of orders come back.
- Cutting creative in a squeeze. It is usually the last place to save, not the first.
- Cutting everything at once in a slow month. Cut the weakest channel and keep the rest steady, so you do not lose your learning.
FAQ
How much should an ecommerce store spend on marketing?
It depends on gross margin, growth goals and stage. Many owners start by treating a share of revenue as a sanity check, then test it against break-even ROAS. A store with a high margin can afford more than one with thin margins, so work from contribution margin first.
How much budget does a startup store need?
Enough to learn: each channel needs a steady stream of conversions to optimise. For most new stores that means picking one or two channels and funding them properly, plus a modest test fund, rather than spreading small amounts everywhere. Fix the site before scaling spend.
Should I put more into ads or into the website?
Fund whichever is the weaker link. If your site converts poorly, extra traffic wastes money. Once conversion is healthy, shifting more towards acquisition makes sense.
How often should I change my budget split?
Review monthly and reallocate quarterly. Change channel budgets in steps of around 20% so platforms keep learning and you can tell what caused a result.
Sources
- ABS: Retail Trade, Australia, June 2025
- Australia Post eCommerce Report 2026
- IAB Australia: online advertising market FY2025
- IAB Australia: Retail and Commerce Media State of the Nation 2026
- OAIC
- OAIC: Organica and Brygon enforceable undertaking
- ATO: Business expenses, what you can and can’t claim
- ATO: Business deductions
