SEO vs paid ads ROI: which pays off more in the long run
SEO or ads: where your money works harder
One of the most practical questions in digital marketing is: where does the money work harder, in SEO or in paid ads?
The answer is not the same for every business, but the numbers help make an informed decision.
This article compares the return on investment of SEO and paid ads over the long term.
How paid ads ROI works
Paid ads are linear. The investment and the return have a direct and predictable relationship.
If you spend 1000 euros on Google Ads and generate 3000 euros in sales, the ROI is 200 per cent. If you spend 2000 euros, the return doubles, provided the campaign is well optimised.
The main characteristic of ad ROI is that it does not accumulate. The following month, you spend the same amount to get the same result. If you stop investing, the return disappears.
How SEO ROI works
SEO has a different return curve. The initial investment is similar to or lower than that of ads, but the return accumulates over time.
A practical example:
- Month 1 to 3: investment in content production and technical optimisation. Little or no organic traffic.
- Month 4 to 6: traffic starts to appear. ROI is still negative or low.
- Month 7 to 12: traffic grows. ROI becomes positive.
- From month 12 onwards: traffic continues to arrive with no additional cost per visit. ROI increases significantly.
An article published today can generate visits for two, three, or more years, with no additional investment.
Direct comparison: SEO vs ads over 24 months
Consider a monthly investment of 500 euros over two years.
Scenario A: ads only
- Total investment: 12,000 euros
- Traffic: consistent while you pay
- Cost per visit: constant
- Residual value at month 25: zero
Scenario B: SEO only
- Total investment: 12,000 euros (distributed between content production and technical work)
- Traffic: grows over time and stabilises at a high level
- Cost per visit: decreases progressively
- Residual value at month 25: traffic continues with no additional cost
After two years, SEO generated more visits per euro invested. And the content continues to work without the need for further investment.
When ads make more sense
Ads are superior to SEO in specific scenarios:
- You need to quickly test a new product or offer
- You have a seasonal campaign with a defined deadline
- The cost per acquisition is low and the product margin is high
- The sector has low competition in organic search
In these cases, ad ROI can be excellent and justify the investment.
When SEO makes more sense
SEO is superior to ads when:
- Business margins are tight
- The cost per click in your sector is high
- The goal is to build a lasting digital asset
- The company can wait three to six months for initial results
- You want to reduce reliance on paid traffic
What most companies should do
The most effective strategy is not to choose one over the other, but to use each for what it does best.
Use ads to generate immediate results while building an SEO foundation. After a few months, SEO begins to deliver consistent traffic and you can gradually reduce ad spend.
The money saved on ads can be reinvested in other areas of the business.
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