Your Google Ads cost per month is the one marketing cost you control almost to the dollar, as long as you understand how Google charges. Most of the surprises come from misunderstanding the budget rules or mixing up the ad spend with the fee for managing it. This guide explains both: how Google turns a daily budget into a monthly bill, what decides the price of each click, how to work out a sensible starting budget, and what good management should include.
The short answer
A Google Ads cost per month has two parts: the ad spend you pay Google, and the fee for whoever manages the campaigns. The spend is up to you. You set an average daily budget for each campaign, and Google’s rules say it may spend up to twice that on a busy day but no more than 30.4 times it across the month. You’re mostly charged when someone clicks, and the price of a click depends on how many competitors bid on the same search, how relevant your ad is, and how likely that search is to lead to a sale. For accounts with an Australian business address, Google adds 10% GST. With us, you pay Google directly and we charge only for managing the account. Our advice is to set the budget from what an enquiry is worth to you, measure every enquiry with conversion tracking, and adjust once real numbers come in.
Two different costs: ad spend and management
Quotes for your Google Ads cost per month often blend these together, which makes them hard to compare. Keep them separate:
| Cost | Paid to | What it covers |
|---|---|---|
| Ad spend | The clicks and views your ads receive, plus GST | |
| Management | Your agency or specialist | Setting up, running and improving the campaigns |
| Landing pages | Whoever builds them | Pages written for the ads, if your site doesn’t have the right ones |
With us, Google bills the ad spend to you directly, so you always see exactly what Google charged. Our fee is for the management work only.
How Google turns a budget into a monthly bill
Google doesn’t ask for a monthly budget. You set an average daily budget for each campaign, and two rules decide what you’re charged:
- On any one day, a campaign may spend up to twice its average daily budget, to catch busier days.
- Across the month, it won’t spend more than 30.4 times the average daily budget.
So a campaign with a $30 average daily budget might spend $60 on a busy Monday, but its spend for the month is capped at $912 (30.4 × $30). The number is only an example of the rule; the right budget depends on your market.
What decides the price of a click
Google says the cost of each click depends on how much competing advertisers in your area are spending, how relevant your ad is to the search, and how likely that search is to result in a sale. That’s why an emergency trade search in a capital city costs far more per click than a niche product search in a small market.
GST on Google Ads
Google’s tax help page says all Google Ads sales in Australia are subject to 10% GST for accounts with Australian business addresses. Allow for it when you set the budget, and ask your accountant about claiming it back.
Working out a starting budget
A good starting budget, and so a sensible Google Ads cost per month, comes from your own numbers, not a round figure. Work through it in this order:
- Know what an enquiry is worth. Average sale value, and how many enquiries turn into sales.
- Check click prices. Google’s Keyword Planner, inside a Google Ads account, shows the range advertisers pay for the searches you care about.
- Estimate clicks per enquiry. How many visitors your landing page needs before one gets in touch. Conversion tracking will give you the real figure within weeks.
- Multiply it out. Clicks per enquiry × cost per click = cost per enquiry. Set a daily budget that buys enough clicks to learn something in a month.
- Test, then adjust. After the first month, compare the cost per enquiry with what an enquiry is worth, and scale up only what’s working.
What decides your Google Ads cost per month
These are the levers that move your Google Ads cost per month up or down, and most of them are in your control:
- Your industry and area: more competitors bidding means dearer clicks.
- How targeted your keywords are: specific searches and negative keywords stop you paying for clicks that were never going to buy.
- Your ads and landing pages: relevant ads and pages that match the search help you win clicks at a better price and turn more of them into enquiries.
- Where and when ads run: a tight service area and business-hours schedule stop spend leaking to places and times you can’t serve.
- Campaign type: Search, Shopping, Performance Max, Display and YouTube each reach people differently and suit different goals.
Costs people forget
A few costs sit around your Google Ads cost per month without appearing on Google’s invoice:
- Landing pages: sending ads to your home page wastes clicks. A page written for each main service usually pays for itself.
- Images and video: Display, Performance Max and YouTube campaigns need creative assets, and good ones take design time.
- Answering enquiries: ads bring calls and forms at the times they run. If nobody answers quickly, the spend is wasted, so plan who responds.
- Product data: Shopping ads run from your store’s product feed, so titles, prices and images need to be accurate and complete. It’s worth getting right when an online store is first built.
What good management includes
Whoever manages your account should be doing real work each month, not just checking it. Our Google Ads management covers:
- Campaign setup and keyword research, including the searches to exclude.
- Conversion tracking, so every call, form and sale is counted.
- Landing pages that match what people searched for.
- Ongoing optimisation: bids, keywords, ads and budgets adjusted as results come in.
We run Search, Shopping, Performance Max, Display and YouTube campaigns, including remarketing, with a three-month minimum, then month to month. The management fee depends on how many campaigns and types you run, whether landing pages need building, and how much ongoing work the account needs.
Red flags when hiring someone to run your ads
- The ad account isn’t in your name. You should own it and pay Google directly, so your history and data stay with you.
- Ad spend bundled into one fee. If you can’t see what Google charged, you can’t tell how much went to ads.
- No conversion tracking. Without it, nobody knows which clicks became enquiries.
- Guaranteed positions or leads. Ads work in a live auction, so nobody controls the result.
- Reports that stop at clicks. Clicks cost money; enquiries and sales are what you’re paying for.
Google Ads or SEO?
Your Google Ads cost per month buys visibility today, and it stops the moment the budget does. SEO takes months to build but keeps bringing visitors without paying per click. Many businesses run ads for immediate enquiries while SEO grows underneath. For the SEO side, see what SEO costs per month and how long SEO takes to work.
Frequently asked questions
Is there a minimum budget for Google Ads?
You choose the average daily budget for each campaign and can change it at any time. The practical minimum Google Ads cost per month is the budget that buys enough clicks to tell you whether the campaign works.
Why did Google spend more than my daily budget?
Google may spend up to twice your average daily budget on a busy day. Across the month, it won’t spend more than 30.4 times the daily budget, so your Google Ads cost per month stays within the limit.
Do Google Ads include GST in Australia?
Yes. Google charges 10% GST on Google Ads for accounts with an Australian business address.
Do I pay every time my ad is shown?
On most search campaigns you pay when someone clicks, not when the ad is shown. Some other campaign types and bidding options charge differently, so check how each campaign is set up.
How soon do Google Ads bring enquiries?
Ads can start showing as soon as they’re approved, so enquiries can arrive within days. Expect the first few weeks to be about learning which searches and ads convert, then costs usually settle as the campaign is refined.
Can I run Google Ads myself?
Yes, and plenty of small businesses do. The risks are paying for irrelevant searches and not tracking conversions. Many owners bring in help once the spend is large enough that small improvements save real money.
Final thoughts
Your Google Ads cost per month is the ad spend you set plus the fee for managing it. Keep the two separate, keep the account in your name, and track every enquiry so the budget follows the results. If you’d like help setting it up properly, see our Google Ads service or tell us about your business. We reply the same business day, Brisbane time, with how we’d start.
This guide is general information, not financial advice. Google’s billing rules and tax settings were checked on 30 September 2026 and can change, so check Google Ads Help and speak to your accountant about GST.
