SEO vs PPC: when to pay for Google Ads and when to invest in rankings

SEO vs PPC is a choice between earning your place in Google’s results and renting it. SEO (search engine optimisation) is the work that gets your pages into the unpaid, organic results. PPC (pay-per-click) is advertising you pay for each time someone clicks, which for most small businesses means Google Ads. Both put you in front of people searching for what you sell. They differ in speed, in how the cost behaves and in what you keep when you stop paying.

On a first call, clients ask me how long it takes to rank. The honest answer, months in most cases, is why this comparison matters: an ad can be on the first page this week. In practice, I use ad data to decide which searches deserve the SEO work, and I show how below.

This comparison is part of my guide on how to get more clients, which covers the other channels.

SEO vs PPC at a glance

Speed: ads this week, rankings in months

PPC is the fast one. Once your account, ads and landing page are ready, Google reviews most ads within one business day, and an approved ad can run the same day. If people search for what you sell in your area, the first clicks can arrive on day one. The first enquiry then depends on your budget and on how well your page turns visitors into calls.

SEO is slow by nature. Google’s own guidance on hiring an SEO says that, in most cases, it takes four months to a year to put improvements in place and then see the potential benefit. My article on how long SEO takes breaks that down stage by stage.

Sometimes it goes much faster. For Pilotech, an air conditioning installer near Paris, building the website took about a month, the first lead came three weeks after it went live, and one ranking came within a day or two. That is exceptional, and the reason behind it matters more than the speed: the site that ranks first or second sells one specific thing, air conditioning with no outdoor unit. Another site I built for the same client offered too many services and never worked. The ranking site is on the Pilotech Teknopoint page.

What surprised me just as much was how much better the leads were, which makes sense: someone who types a precise need into Google already knows what they want.

Speed is also about how fast you learn. A few weeks of ads can tell you which searches bring enquiries and which only bring clicks; SEO takes months to tell you the same thing. That is the best reason to pay for ads even when rankings are the long-term plan, and I come back to it below.

Cost: paying per click vs paying for the work

PPC: a price on every click

On a search campaign, Google Ads charges you per click, at a price set by an auction between the advertisers bidding on the same search. You control the total with an average daily budget. Google can spend up to twice that budget on a busy day, but over a month it charges no more than 30.4 times it, as Google Ads Help explains. With an average daily budget of £15, one day can cost £30 and the month stops at £456.

To see what clicks cost before spending anything, open Keyword Planner, free inside a Google Ads account. For each keyword, it shows a Top of page bid (low range) and a Top of page bid (high range): roughly the 20th and 80th percentiles of recent bids that put an ad at the top of the page. They are estimates, not prices. My Google Keyword Planner tutorial shows how to use it without running a single ad.

What defines PPC is that the cost never stops. Every new visitor is another click, this month, next month and every month you want to be there.

SEO: the work comes first, the clicks are free

SEO is not free either. The clicks are, but the work is not: a page for each search you want to win, a Google Business Profile, technical fixes, then new and updated content. You pay for it with your time or with a provider’s fee, and most of that cost comes months before the first enquiry.

What changes the sum is the shape of the cost. A page costs the same whether 20 or 200 people click on it in a month, and it keeps working in the months you leave it alone. So the fair comparison is what the same visits would cost you in ads:

value of organic visits = clicks a month × cost per click
example:                  80 clicks × £2.50 = £200 a month, £2,400 a year
months to break even    = what the page cost ÷ its monthly value

These are round numbers to show the arithmetic, not a benchmark: use the click prices Keyword Planner gives for your own searches and area. Then divide what the page cost you, in time or fees, by its monthly value: that is how many months it takes to pay for itself. Every month it holds its position after that is a month of clicks you no longer buy, minus what you spend keeping it up to date.

What you keep when you stop paying

Stop the ads and the visits stop with them. What you keep is what you learnt: which searches brought enquiries, which headlines earned clicks, which pages turned visitors into calls. The search terms report in Google Ads shows many of the actual searches that triggered your ads, in your customers’ own words, and that list is worth keeping whatever you do next.

Stop SEO and nothing switches off. Pages that rank usually hold their positions for a while, then slip as competitors publish, earn links and improve their own pages. SEO work behaves like an asset that slowly loses value without upkeep, while ads behave like rent.

The pages stay too. A page written for one specific search can rank in the organic results and serve as the landing page for your ads on the same search. Google even rates that page: landing page experience is one of the three parts of Quality Score, the 1-to-10 diagnostic Google Ads gives your keywords.

Who sees and clicks: ads, organic results and AI answers

Ads and organic results share the page, not the same attention. Since October 2025, Google groups text ads under a single Sponsored results label that stays at the top of the screen as people scroll, with a Hide sponsored results button that collapses them in one click, according to Google’s announcement. Some people skip ads on principle; others click the first result that matches their search, paid or not. Rather than trust general claims about who clicks what, look at your own figures once both channels run.

Both channels now compete with AI answers too. On searches that show an AI summary, people click fewer results: in a 2025 Pew Research study of US adults’ browsing, they clicked a traditional result in 8% of visits when a summary appeared, against 15% without one. Being cited in those summaries is earned, not bought: Google’s own guide to its AI features, published in May 2026, says that the usual SEO best practices still apply, because these features rest on the same ranking and quality systems as the rest of Search.

When to pay for Google Ads, and when to invest in rankings

Pay for Google Ads when

• You need enquiries this month. A new business, a new website, a quiet season: SEO will not fill the gap in time.
• You want to test a search before investing in it. Better to learn in a few weeks that a search brings clicks but no enquiries than after months of writing for it.
• The offer is short-lived: a seasonal service, an event, a launch. By the time a page ranks, the season is over.
• The organic results are out of reach for now, filled with directories, national brands and comparison sites you will not outrank this year.

Google Ads is not that tricky. It mainly asks for a bit of research into your target and what they search, so that you know where to be seen and your page converts better. My guide to Google Ads for small business covers that research and the settings that matter.

Invest in rankings when

• The search is at the heart of your business, one you will still want to be found for in five years. Paying for every click on it, year after year, is the expensive option.
• Clicks are expensive. A high top-of-page bid usually means advertisers make money from that search, which is exactly why winning it organically is worth the wait.
• Your offer is specific and local. Narrow searches in one area have fewer competitors. For local results, Google ranks businesses on relevance, distance and prominence, and nobody can pay for a better local ranking.
• You have more time than budget. SEO is mostly work, and you can do much of it yourself: my guide to small business SEO shows the order I follow.

If you sell to businesses you can list, there is a third route that is neither ads nor rankings: writing to them first. My comparison of PPC vs cold email covers it.

How I use ad data to choose SEO keywords

This is where the two channels meet in my own work. Advertisers rarely keep paying for searches that bring them nothing, so what they pay is a free map of the searches worth money. I read that map, then go after the best of those searches with SEO instead of paying for every click.

1. List the searches your customers type, in their words: the service, the problem, the town. For example “boiler installation Kent” or “office cleaning quote”.
2. Check what advertisers pay for each one. In Semrush, Keyword Overview shows the CPC (the average price advertisers pay for a click), the competition and the monthly volume; a free account allows 10 searches a day. Keyword Planner’s top-of-page bid ranges give the same signal from Google’s side.
3. Keep the searches that are specific and expensive. A high CPC usually means the search brings buyers. A specific search beats a broad one: that is the Pilotech lesson, where the site built for one precise need ranks and the site that offered everything never did.
4. Build one page per search, written for that search and nothing else.
5. Test first if you have a budget. A small campaign on your three best searches for a few weeks shows which ones bring enquiries. Write the pages for those first.
6. Once a page ranks, check the overlap. Link Search Console to Google Ads from the Associations page in Search Console’s settings (you need to be an owner of the Search Console property and an admin of the Ads account), then open the paid and organic report. It shows your organic results next to your text ads, search by search, so you can see where you may be paying for clicks you would get anyway.

My review of whether Semrush is worth it goes through what I use it for, and the cheaper alternatives.

Your plan for the next six months

Starting from nothing, this is the order I would follow:

1. Month one: research. Run steps 1 to 3 above, then work out what a new client is worth to you, so you know what you can pay to win one.
2. If you need enquiries now, start a small ad test on your three best searches, with a fixed budget and an end date. Judge it on enquiries, not clicks.
3. At the same time, build the pages for the searches you want to own, one per search, and complete your Google Business Profile.
4. From month two, move the budget towards the searches that bring enquiries, and write the pages for those first.
5. From month four, compare total enquiries, what the ads cost and where your pages now rank, then decide search by search where next month’s money goes.

One trap to avoid along the way: there is a lot of noise in marketing, and it is easy to keep adding tools and channels instead of running one or two properly. Two channels you actually run will teach you more than five you half run.

You do not need anyone to run a small Google Ads test or to write your first pages. When I take on SEO for a client, I work on it for one to three months, then we decide together on another plan or stop there; for a clear, specific offer it works in the end, because SEO simply takes time. If you would rather hand the rankings over, my SEO service explains how I work.