Spending more on marketing does not automatically mean more growth. The eCommerce businesses that scale efficiently allocate budgets based on data, not gut feeling. They know their customer acquisition cost by channel, understand their payback periods, and invest in the mix that maximises return on ad spend. This guide provides a framework for allocating your marketing budget strategically.
How Much to Spend
Industry benchmarks suggest eCommerce businesses should allocate 10-20% of revenue to marketing during growth phases and 5-10% at maturity. However, these are starting points, not rules. A new store launching into a competitive market may need to invest 25-30% of revenue in marketing to build awareness and acquire its first customers. An established store with strong organic traffic might spend as little as 5%.
The right number depends on your margins, customer lifetime value, and growth targets. If your average customer lifetime value is EUR 200 and your blended cost per acquisition is EUR 40, you have healthy economics that support aggressive marketing spend. If those numbers are reversed, you have a profitability problem, not a marketing budget problem.
Channel Allocation Framework
- Paid search (20-30%): Google Shopping and Search ads capture high-intent buyers actively searching for your products. The ROI is measurable and typically strong for established categories.
- Paid social (20-30%): Meta, TikTok, and Pinterest ads drive awareness and consideration. Essential for brand-building and reaching audiences who do not yet know they want your product.
- Email and SMS (10-15%): The highest-ROI channel for most eCommerce businesses. Invest in platform costs, automation setup, and list growth. Owned channels become more valuable over time.
- SEO and content (15-20%): Long-term investment that compounds. Organic traffic has no marginal cost per visit, making it the most profitable channel at scale.
- CRO and testing (5-10%): Conversion rate optimisation amplifies every other channel. A 10% improvement in conversion rate makes all your traffic 10% more valuable.
Measuring What Matters
Track cost per acquisition (CPA), return on ad spend (ROAS), and customer lifetime value (CLV) by channel. Beware of vanity metrics — impressions, clicks, and engagement mean nothing if they do not ultimately drive revenue. Attribution modelling helps you understand which touchpoints contribute to conversions, but accept that no attribution model is perfect. Use data to make better decisions, not to achieve false precision.
Scaling Spend Effectively
Scale spend gradually on channels that are working and cut aggressively on channels that are not. Every channel has diminishing returns — the first EUR 1,000 on Facebook ads will have a higher ROAS than the tenth EUR 1,000. When a channel's marginal ROAS drops below your target, redirect budget to underexplored channels rather than forcing more spend into a saturated one. At Born Digital, we help eCommerce businesses build the analytics infrastructure needed to make these decisions with confidence.