Search Engine Marketing (SEM) Guide for Australian Businesses: Strategies, Ad Types and Optimisation Tips

Search engine marketing, SEM, competes for paid ad positions on Google and Bing results pages at the moment an Australian buyer searches for what you sell, and approved ads that win their auctions start bringing clicks without waiting for organic rankings. Enquiries and sales then depend on demand, your offer and the landing page. You pick the keywords, the states or suburbs you target and the daily budget, and on the usual model you pay only for a click. Google held 87.9% of search engine market share in Australia in September 2026 and Bing 9.17% (StatCounter), so an Australian SEM plan covers both. This guide walks through the ad types, keyword match types, campaign set-up, the metrics worth tracking and where to optimise, with Australian examples.

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Written by Kevin Dam, founder of Aemorph, who has practised SEO since 2010 and sits on the Forbes Agency Council. Aemorph is a Google Partner. LinkedIn

What Is Search Engine Marketing (SEM) for Australian Businesses?

SEM is paid advertising on search results pages: an Australian business bids to show its ad on the searches that match its offer, and meets each buyer while the need is live. Almost all SEM runs on pay-per-click, PPC, through Google Ads or Microsoft Advertising, which serves ads on Bing. You pay when a searcher clicks rather than each time the ad appears. The plain-English introduction is the guide to what SEM is.

Why does SEM work for Australian businesses?

SEM works because the searcher has already typed the need into Google or Bing, so a relevant ad lands in front of a buyer who is looking right now. That intent is why paid search sends qualified traffic, enquiries and sales quickly. The search states the problem; your ad and landing page answer it.

How does SEM differ from SEO in Australia?

SEM pays for a place on the results page and SEO earns an unpaid ranking, so SEM shows faster and SEO keeps working after the spending ends.

SEM and SEO compared for Australian advertisers. For the full channel picture, read SEO vs SEM vs SMM.

Why Use SEM in Australia?

Paid search gives an Australian business five things organic search alone does not: speed, precise targeting, measurable spend, a budget you adjust daily and a place on crowded results pages.

• Speed. Ads become eligible to run once approved, which suits a product launch, an end of financial year sale or a time-limited offer.
• Precise targeting. You target by keyword, state, city or radius, time of day, device, language and audience, so the budget reaches buyers in the areas you serve.
• Measurable spend. Impressions, clicks, conversions and cost per acquisition are tracked, so with conversion tracking in place you see what each dollar of spend returns.
• Budget you adjust. Start with a small test, scale the campaigns that convert, and pause or trim spending when demand shifts.
• A place in competitive categories. In insurance, property and ecommerce, paid search keeps you on high-intent searches while organic rankings take time to build.

Australian Paid Search Figures: Google, Bing, GST and Ads in AI Overviews

Australian SEM runs mostly through Google, with Bing holding close to a tenth of search engine market share, and Google Ads now places ads inside AI Overviews in Australia and adds 10% GST to accounts with an Australian business address. Those four facts shape the platform mix, the budget and the reporting; the share figures come from StatCounter, Australia and the internet figures, as of October 2025, from DataReportal, Digital 2026: Australia. Ads in AI Overviews show text and Shopping ads from existing Search, Shopping and Performance Max campaigns; advertisers have no setting to target that placement directly or to opt out of it, and Google does not show ads there for sensitive categories such as finance, healthcare, gambling and alcohol (Google Ads Help, about ads and AI Overviews).

Sources: StatCounter Global Stats, search engine market share, Australia, September 2026; Google Australia, "Introducing AI Overviews in Australia", 29 October 2024; Google Ads Help, "About ads and AI Overviews" and "Taxes in your country", read 24 October 2026; DataReportal, Digital 2026: Australia, data as of October 2025.

With Bing at 9.17%, a Microsoft Advertising campaign is worth testing once the Google account converts. Google does not give tax advice, so confirm the GST treatment of your ad spend with your accountant.

What Are the Main Types of SEM Ads for Australian Advertisers?

Australian paid search runs on search and shopping ads, and Google Ads campaigns add display, video, local and remarketing around them, six options that each suit a different point in the buyer's journey. Strictly, only search and shopping ads sit on the results page: display and video run on other Google inventory, local describes a store-visit goal, and remarketing is an audience strategy used across formats.

The six SEM ad types, with Australian examples.

What are search ads?

Search ads are text ads shown on the results page for the keywords you bid on, the most common SEM format and the one closest to a purchase. Google's responsive search ad accepts up to 15 headlines of up to 30 characters each and up to 4 descriptions of up to 90 characters each, then tests the combinations to find the ones that perform (Google Ads Help, about responsive search ads). Assets such as sitelinks, callouts and structured snippets add detail and enlarge the ad.

What are display ads?

Display ads are banners, images and video placed on websites and apps across a display network, aimed by interest, demographic, topic or placement rather than by a search. They build awareness and bring back past visitors. Their click-through rate usually sits below search ads, because the viewer is reading or watching, not searching, and a banner shown too often stops getting noticed.

What are shopping ads?

Shopping ads put your product photo, price and store name straight onto the results page, a strong fit for Australian online stores selling physical goods. They draw on a product feed uploaded to Google's merchant platform, and that feed needs accurate prices and stock, updated regularly. Popular categories attract heavy competition and high costs.

What are video ads?

Video ads play on YouTube and Google video partners before, during or after other videos, and they suit brand stories, product demonstrations and recall. The formats include skippable and non-skippable in-stream ads, in-feed ads and bumper ads, which are non-skippable and 6 seconds or shorter (Google Ads Help, video ad formats). Depending on the format you pay per view or per thousand impressions. Video costs more to produce and drives awareness more than same-day sales.

What are local ads?

Local ads show nearby Australian buyers your address, opening hours and directions on Google Search and Maps, which suits stores, restaurants, practices and trades. In Google Ads, a Performance Max campaign with store goals works to drive store visits and calls across Google's channels (Google Ads Help, Performance Max for store goals). It draws on your location details, usually from a verified, complete Google Business Profile, and location settings steer delivery towards the area you set rather than drawing an exact boundary.

What are remarketing ads?

Remarketing ads follow up with people who visited your site and left without buying or enquiring, and bring them back to finish. They run across search, display and YouTube, using audiences built from page visits and actions. They need steady site traffic and correct tagging, cookie consent settings limit who you track, and repeating one ad too often causes fatigue.

How Does SEM Work?

An SEM campaign moves through six steps, from keyword research to optimisation, and each one changes what an Australian customer costs you.

1. Research the search terms your buyers use, with Google Keyword Planner, Semrush or Ahrefs.
2. Write ads that answer the search, with one clear call to action and a link to a matching landing page.
3. Bid in the ad auction on the keywords you chose.
4. Appear on the results page, marked as an ad or sponsored result, when your ad wins a position.
5. Pay for each click, on the pay-per-click model.
6. Track clicks, cost per click, conversions and return on ad spend, then adjust bids, keywords, copy and landing pages.

How does the ad auction decide position?

Google orders ads by Ad Rank, which weighs your bid, the quality of your ads and landing page, Ad Rank thresholds, the competition in the auction, the context of the search and the expected impact of your assets (Google Ads Help, About Ad Rank). The top bid does not automatically take the top spot: a more relevant ad competes for less. Quality Score is a separate diagnostic, rated 1 to 10 from expected click-through rate, ad relevance and landing page experience, and Google states that it is not an input in the ad auction (Google Ads Help, Quality Score).

How Do Keyword Match Types Work?

A match type sets how closely a search has to relate to your keyword before the ad shows, trading reach against wasted clicks.

Match type definitions, syntax and the broad match example: Google Ads Help, about keyword matching options, October 2026. The other examples are illustrative. Negative keyword behaviour: Google Ads Help, about negative keywords.

How do you combine match types?

Layer the match types: broad match to find new searches, phrase and exact match for the queries that convert, and fresh negative keywords every week to block the rest. Broad match reaches furthest and carries the most risk of irrelevant clicks. Exact match gives the tightest control on the fewest searches. Negative keywords hold the budget on searches with buying intent; review them regularly so they never block a valuable query.

How Do You Set Up Your First SEM Campaign in Australia?

A first Australian campaign takes seven steps, and the choices made at set-up fix your targeting, budget control and conversion rate for months.

Step 1: How do you open a Google Ads account?

Open the Google Ads account with your billing method and currency, then give each campaign its goal and target locations, because every report builds on those settings. Campaign goals include website traffic, leads and online sales. With an Australian business address, Google Ads adds 10% GST to your ad charges (Google Ads Help, taxes in your country). Financial services advertisers in Australia also go through Google's financial services verification, which lists ASIC, the Australian Financial Security Authority and the Australian Business Register as the relevant references, enforced from 30 August 2022 (Google Advertising Policies Help, financial services verification). The account itself has three layers: the campaign holds the objective and budget, the ad group holds one theme, and the keywords and ads inside it match specific searches.

Step 2: How do you choose keywords?

Choose keywords by intent first, because the words an Australian buyer types show how close they are to acting. Use Google Keyword Planner, Semrush or Ahrefs, and put these first:

• High-intent terms, such as "book dentist appointment".
• Local terms, such as "electrician Parramatta" or "plumber Geelong".
• Long-tail terms, which meet less competition and bring better-qualified visitors.

Group keywords by theme so that each group becomes an ad group. The keyword research guide sets out the method in full.

Step 3: How do you write the ad copy?

Write ads that match the searcher's intent and state your selling points plainly, so the right buyers click and the wrong ones scroll past.

• A clear headline with the main keyword and the benefit, such as "End Paperwork With Simple Accounting Software" rather than "Accounting Software".
• A description that adds what the buyer receives.
• A call to action, such as "Get a Free Quote" or "Book a Demo".
• Assets: sitelinks, callouts, location details and structured snippets.

Ad copy is advertising, so the claims rules apply to it: health practitioners advertise under the National Law and Ahpra's advertising guidelines, and the guide to the Australian Consumer Law and marketing covers claims for every business. General guidance, not legal advice.

Step 4: How do you set targeting and bidding?

Set targeting and bidding so the ads reach the right Australian buyers at the right hours without spending on the wrong ones.

• Locations: the states, cities, suburbs or radius where your buyers are. The default setting also reaches people who have shown interest in those places; the Presence setting limits ads to people in or regularly in them (Google Ads Help, advanced location options).
• Devices: desktop, mobile or tablet, matched to how your audience searches.
• Bid strategy: manual bids per keyword, or automated strategies such as Target CPA or Maximise Conversions, which set the bid in each auction from Google's conversion data.
• Bid adjustments: with manual bidding, raise bids for the locations, hours or devices worth more to you; buyers in Perth search on a different clock from buyers in Sydney. Google does not support manual bid adjustments on Smart Bidding strategies, apart from exceptions such as a -100% device adjustment, so with Target CPA or Maximise Conversions you manage conversion goals, targets and budget instead (Google Ads Help, about bid adjustments).

Step 5: How do you build the landing page?

Build a landing page that repeats the ad's promise, loads fast on a phone and makes the next step obvious, because the page decides whether a paid click turns into an enquiry. A close match between ad and page also lifts ad quality, one of the Ad Rank factors.

Step 6: How do you launch and monitor the campaign?

Launch only once conversion tracking works, then review impressions, clicks, click-through rate, conversions and spend each week. Read the search terms report and add irrelevant terms as negative keywords. Set up Google Ads conversion tracking or Google Analytics 4 so you see what buyers do after the click.

Step 7: How do you optimise over time?

Optimise weekly or fortnightly, shifting budget towards the keywords, ads and segments that convert.

• Pause or rework keywords and ads with weak click-through or conversion rates.
• Test ad copy and landing page versions against each other.
• Move budget to the strongest locations, devices and keywords, and lower bids where segments do not convert.
• Keep adding negative keywords.

Which SEM Metrics Matter?

Nine metrics tell an Australian advertiser whether paid search spend returns business value, and the ones that matter most connect to conversions and revenue.

Key SEM metrics. Quality Score and impression share definitions: Google Ads Help, Quality Score and Google Ads Help, impression share, October 2026.

Report costs with GST shown separately, so cost per conversion and return on ad spend compare like with like across months.

What does a low impression share tell you?

A low impression share means your ads missed searches they qualified for, usually because the budget ran out or Ad Rank fell short. Google calculates it as your impressions divided by the total impressions you were eligible for, estimated from your targeting, approval status and quality. Raise the budget on campaigns that already convert, or improve ad quality before you raise bids.

Which Areas Do You Optimise in a Running Australian Campaign?

Five areas decide how much of an Australian SEM budget reaches buyers ready to act: keywords, ad copy, bidding, landing pages and monitoring.

• Keywords. Drop underperforming terms, add long-tail terms with clear intent, and keep the negative keyword list growing.
• Ad copy and assets. Match headlines and descriptions to intent, keep one clear call to action, and add sitelinks, callouts and location details.
• Bidding and budget. Use automated bidding once conversion data supports it, keep device, location and hour adjustments for manually bid campaigns, and move budget from weak campaigns to strong ones.
• Landing pages. Keep each page relevant to its ad, fast and mobile-friendly, with one clear action.
• Monitoring. Watch click-through rate, cost per click and conversion rate on Google and Bing, and test one change at a time.

Which SEM Tools Do You Need?

A working Australian SEM stack has an ad platform for Google, one for Bing, keyword research, analytics and a way to test landing pages.

SEM tools. Microsoft Advertising network: Microsoft Advertising Help, October 2026. Follow your organic positions next to paid results with rank tracking tools. On the organic side, Aemorph verifies Australian client sites in Google Search Console and Bing Webmaster Tools.

Get Expert SEM Support in Australia

Paid search brings Australian buyers quickly but stops when the budget stops, so the strongest return comes from a well-run account paired with the SEO that keeps you visible afterwards. Aemorph's SEM service sets up and manages Google Ads and Microsoft Advertising campaigns around your goals. Aemorph is headquartered in Singapore, has no office in Australia, serves Australian clients remotely in Australian business hours and responds within 24 hours to all communication.

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