Key takeaways
- PPC (pay per click, like Google Ads) rents visibility: you pay for every click, and the leads stop when the budget stops.
- SEO builds visibility you own: it starts slower, but the same monthly budget brings more leads each month as pages gain rankings.
- To grow with ads, you have to raise the budget. To grow with SEO, you mostly need time and consistent work.
- Most businesses do best with both: ads for speed today, SEO for a lower cost per lead tomorrow.
What is the difference between SEO and PPC?
PPC means pay per click: you bid in an auction, such as Google Ads, and pay every time someone clicks your ad. SEO means search engine optimization: you improve your website so it earns the unpaid results. PPC works the day you turn it on. SEO takes months, but the clicks themselves are free.
The key detail is in how each one is priced. Google explains in its cost-per-click help page that with CPC bidding you pay for each click on your ad, and the Ad Rank page explains that your position is recalculated in an auction every time someone searches, based on your bid, your ad quality and how competitive the auction is. On the organic side, Google's guide to how Search works is direct: Google does not accept payment to crawl a site more often or to rank it higher. You earn organic positions with useful pages, a healthy website and a good reputation. If you are new to the topic, the home page explains how I work on the organic side.
How does SEO grow while the budget stays the same?
Each piece of SEO work is an asset that keeps working. A service page you publish in month 3 can still bring calls in month 30. Every month you add pages, fix problems and earn mentions, and the results stack on top of each other. Ads work like a faucet: the flow stays the same unless you pay more.
The chart below is a simple model, not a promise. Both channels get the same $2,000 every month. Ads deliver about 25 leads a month from the start. SEO brings almost nothing in the first months, then climbs as pages rank, and passes ads around month 12. The real timing depends on your market, your website and your competition, but the shape is what I see again and again.
Both channels get $2,000 a month. Ads deliver from day one and stay flat; SEO starts slow and compounds. Illustrative model, not a forecast or a promise. Assumptions are listed under the charts.
See the numbers
| Month | SEO | Google Ads (PPC) |
|---|---|---|
| 1 | 1 | 25 |
| 2 | 2 | 25 |
| 3 | 2 | 25 |
| 4 | 3 | 25 |
| 5 | 5 | 25 |
| 6 | 6 | 25 |
| 7 | 9 | 25 |
| 8 | 12 | 25 |
| 9 | 15 | 25 |
| 10 | 20 | 25 |
| 11 | 25 | 25 |
| 12 | 30 | 25 |
| 13 | 35 | 25 |
| 14 | 40 | 25 |
| 15 | 45 | 25 |
| 16 | 48 | 25 |
| 17 | 51 | 25 |
| 18 | 54 | 25 |
| 19 | 55 | 25 |
| 20 | 57 | 25 |
| 21 | 58 | 25 |
| 22 | 58 | 25 |
| 23 | 59 | 25 |
| 24 | 59 | 25 |
Notice the first months. This is where many owners give up on SEO, because ads look much better on paper. That is normal and expected: Google's SEO Starter Guide says some changes take effect in a few hours and others take several months. The guide on how long SEO takes explains what to expect month by month.
Why does PPC need more money to grow?
With ads, every extra lead has a price. If one lead costs $80 and you want twice as many, you need roughly twice the budget, and often more, because the extra clicks come from more competitive auctions. SEO grows by adding pages and authority, so the monthly fee does not have to rise with the leads.
The next chart asks a simple question: how much would you need to spend on ads each month to get the same number of leads that SEO brings in the model? As the organic curve climbs, the ad budget has to climb with it. The model even assumes the cost per click stays flat, which is generous to ads, because in real auctions buying more clicks usually means bidding higher.
To match the SEO lead curve with ads alone, spend has to grow with every extra lead (at $80 per lead). The SEO budget stays at $2,000. Illustrative model, not a forecast or a promise. Assumptions are listed under the charts.
See the numbers
| Month | SEO | Google Ads (PPC) |
|---|---|---|
| 1 | $2,000 | $2,000 |
| 2 | $2,000 | $2,000 |
| 3 | $2,000 | $2,000 |
| 4 | $2,000 | $2,000 |
| 5 | $2,000 | $2,000 |
| 6 | $2,000 | $2,000 |
| 7 | $2,000 | $2,000 |
| 8 | $2,000 | $2,000 |
| 9 | $2,000 | $2,000 |
| 10 | $2,000 | $2,000 |
| 11 | $2,000 | $2,000 |
| 12 | $2,000 | $2,400 |
| 13 | $2,000 | $2,824 |
| 14 | $2,000 | $3,222 |
| 15 | $2,000 | $3,575 |
| 16 | $2,000 | $3,872 |
| 17 | $2,000 | $4,111 |
| 18 | $2,000 | $4,296 |
| 19 | $2,000 | $4,436 |
| 20 | $2,000 | $4,539 |
| 21 | $2,000 | $4,615 |
| 22 | $2,000 | $4,669 |
| 23 | $2,000 | $4,707 |
| 24 | $2,000 | $4,735 |
What happens to the cost per lead over the years?
With ads, the cost per lead stays roughly where the auction puts it, year after year. With SEO, the first year is usually more expensive per lead, because you pay before results arrive. From the second year, the same budget is divided by many more leads, so the cost per lead tends to drop well below ads.
Same $2,000 a month. With ads, every lead costs about the same. With SEO, the same budget is spread over more leads each year. Illustrative model, not a forecast or a promise. Assumptions are listed under the charts.
Be honest with yourself about year one. In this model, SEO costs more per lead than ads during the first twelve months. If you cannot wait that long, start with ads and add SEO as soon as cash flow allows. That is exactly what I recommend to new businesses in the local SEO vs Google Ads guide.
What happens if you stop paying?
Ads stop showing as soon as the budget runs out, so leads drop to zero the next day. Pages that already rank keep appearing in Google, so organic leads usually continue for months. They fade slowly if nobody updates the content, fixes new technical issues or answers new competitors, but you do not lose everything overnight.
Ads stop the day the budget stops. Pages that already rank keep bringing leads for months, slowly fading if nobody maintains them. Illustrative model, not a forecast or a promise. Assumptions are listed under the charts.
See the numbers
| Month | SEO | Google Ads (PPC) |
|---|---|---|
| 22 | 58 | 25 |
| 23 | 59 | 25 |
| 24 | 59 | 25 |
| 25 | 57 | 0 |
| 26 | 56 | 0 |
| 27 | 54 | 0 |
| 28 | 52 | 0 |
| 29 | 51 | 0 |
| 30 | 49 | 0 |
| 31 | 48 | 0 |
| 32 | 46 | 0 |
| 33 | 45 | 0 |
| 34 | 44 | 0 |
| 35 | 42 | 0 |
| 36 | 41 | 0 |
Does SEO also help me appear in AI answers?
Yes. Google says there are no extra requirements to appear in AI Overviews or AI Mode: a page needs to be indexed and eligible to show with a snippet, and normal SEO fundamentals still apply. Ads do not earn citations in AI answers. The work that ranks your pages is the same work that gets you cited.
Google's page on AI features and your website lists the basics: let crawlers access your pages, write useful text, keep business information current and use accurate structured data. Assistants like ChatGPT and Perplexity also read the web, and they tend to cite pages that answer questions clearly. This is a new reason why organic work compounds: one good page can now bring visitors from Google, from Maps and from AI answers at the same time. The AI search optimization service covers this in detail.
SEO and PPC side by side
| SEO | PPC (Google Ads) | |
|---|---|---|
| How you pay | Monthly work or a project fee; clicks are free | Every click, priced in an auction |
| When results start | Usually months | As soon as the campaign is approved |
| How it grows | Compounds as pages and authority build up | Grows with the budget |
| When you stop | Rankings fade slowly | Leads stop right away |
| Cost per lead over time | High in year one, then tends to fall | Roughly stable, moves with the auction |
| AI answers | Pages can be cited in AI Overviews and assistants | Not cited |
How should I split my budget between SEO and PPC?
A practical rule: use ads to cover what you need this month, and put a steady amount into SEO that you can keep for at least a year. As organic leads grow, test lowering bids on searches where you already rank well. Review the split every quarter using real cost per lead from both channels.
- Measure leads by channel first. Without call and form tracking, you cannot compare cost per lead.
- Use the ads search terms report to pick which pages SEO should build first.
- Keep the SEO budget steady. Stopping and starting resets the compounding.
- Every quarter, compare cost per lead and move budget toward what is cheaper for the same quality.
- Ask for a model with your own numbers. In a free 30-minute call I can plug in your real cost per click and conversion rate.
To see what a steady SEO budget looks like in practice, check the monthly plans or the recovery directory case study, where daily organic clicks grew from about 700 to more than 2,300.
How the model in these charts works
Every number in the charts comes from the assumptions below. They are round, simple numbers chosen to show the shape of each channel, not data from a client or a benchmark. Your own cost per click, conversion rate and ramp speed will be different, and in some very competitive markets SEO can take longer to pass ads.
| Assumption | Value in the model |
|---|---|
| Monthly budget, both channels | $2,000 |
| Average cost per click (Ads) | $4 |
| Visitors who become leads (both) | 5% |
| Ad leads per month | 25 (cost per lead $80) |
| SEO ramp | Near zero in months 1 to 3, about half of its plateau by month 12, close to 60 leads a month by month 24 |
| After the budget stops | Ads: zero the next month. SEO: keeps 97% of its leads each month |
Frequently asked questions
Is SEO cheaper than PPC?
Usually not in the first months, because you pay for work before results arrive. Over one to two years, the cost per lead from SEO tends to fall below ads because the same budget brings more leads each month.
Should I stop Google Ads once SEO works?
Not all at once. Lower bids on searches where you already rank in the top positions and watch total leads. Keep ads for new services, new areas and seasonal peaks.
Can I pay Google to rank higher organically?
No. Google states that it does not accept payment to rank a site higher. Organic positions are earned with useful pages, a healthy site and a good reputation.
Are the numbers in the charts real results?
No. They come from a simple model with the assumptions listed at the end of the guide. My own verified results are on the results page.
How long before SEO passes my ads?
It depends on competition, your website and how much you publish. In the model it happens around month 12. I can estimate it with your data in a free call.
