Switching Google Ads Agencies: Checklist & Data Handover

The most important sentence first: never cancel your Google Ads agency before you have clarified who owns the account and whether you have admin access to all systems. In my experience, this is exactly the mistake that costs the most money when switching agencies – not the cancellation itself.

Switching agencies is not a drama if it happens in an orderly way. It becomes a drama when, after cancellation, the account suddenly disappears, your tracking runs on someone else's Google Tag Manager container, or nobody knows where the last two years of conversion data live.

This guide walks you through the switch step by step: warning signs, what to prepare before you cancel, contract traps, a complete data handover checklist and an honest answer to the question of how to avoid a performance dip.

Warning Signs: When You Should Consider Switching

Not every frustration justifies a switch – sometimes a frank conversation is enough. But from my experience, these signals are serious warning signs:

• You have no access to your own Google Ads account. You receive PDF reports but no login. This is the single biggest red flag.
• Black-box reporting. You see clicks and impressions, but no conversions, no cost per acquisition, no statement about what was actually optimized. What good management looks like instead is covered in detail in my article on good Google Ads management.
• No availability. Questions take weeks to answer, your contact person keeps changing or only exists in sales.
• An empty change history. Google Ads logs every change made in the account. If almost nothing happens there for months, you are paying for management that is not taking place.
• The account belongs to the agency. Your campaigns run in an account the agency created, which "expires" when you cancel. More on this in a moment – this point determines your entire switch.
• Unexplained costs. If you cannot trace what you are paying for, compare against what a Google Ads agency typically costs and which services should be included.

An important caveat: fluctuating performance alone is not a reason to cancel. Seasonality, competition and market shifts affect every agency. A pattern of intransparency, unavailability and missing account access, however, is.

The Most Critical Question: Who Owns Your Google Ads Account?

Before you cancel anything, answer this one question. There are two models:

Model 1: The account belongs to you. It was created with your email address, runs on your payment profile, and the agency accesses it through their manager account (MCC). That is the clean standard. When switching, you remove the old agency's link and link the new one – campaigns, history and data remain fully intact.

Model 2: The account belongs to the agency. The agency created the account within its own structure, often including billing through their payment profile. Legally, you are a client of the agency, not the owner of the account. On cancellation, the agency can keep or shut down the account – and with it the entire campaign history, all conversion data and the learning history of your bidding strategies.

Here is how to find out:

1. Log in to the account (if you can) and check under Admin → Access and security which email addresses hold admin rights.
2. Check under Billing whose payment profile the click costs run through.
3. Ask the agency in writing: "Can you confirm that the Google Ads account with customer ID X is our property and will be handed over in full at the end of the contract?"

If the answer is evasive, you know where you stand – and should prepare the handover all the more carefully.

What to Secure Before You Cancel

Secure first, cancel second. These four areas belong under your control before the notice goes out:

1. Admin Access to the Google Ads Account

Have admin access set up on a company email address – not a staff member's private one. Note the customer ID (the ten-digit number in the top right corner of the account). Without admin access, you can neither remove the old agency later nor link the new one.

2. Access to Tracking and Analytics

The Google Ads account is only half the battle. Just as important:

| System | What you need | Why | |--------|---------------|-----| | Google Tag Manager | Container access with publish rights | This is usually where your entire tracking lives | | Google Analytics 4 | Administrator role at property level | Conversion imports, audiences, historical data | | Google Merchant Center | Admin access (for Shopping campaigns) | Product feed and account links | | Google Business Profile | Ownership (for local campaigns) | Location assets, locally-targeted campaigns (e.g. Performance Max with store goals) |

If your tracking runs through an agency-owned GTM container, clarify whether the container can be transferred – or plan a rebuild in your own container. How clean tracking is structured is explained in the guide on setting up conversion tracking.

3. Export Campaign History and Reports

Even if the account belongs to you: export the most important data as a backup before the switch.

• Campaign structure via Google Ads Editor (full account as a file)
• Performance reports for the last 12–24 months (campaigns, ad groups, keywords, search terms)
• A list of conversion actions including counting method and attribution settings
• Audience and remarketing lists (at least as documentation)

4. Invoices and Contract Documents

Collect all invoices, the contract and the service description. You need them for the notice period – and the new team needs them to understand what was agreed so far.

Notice Periods and Contract Traps

Before the cancellation goes out, read your contract for these points:

• Term and notice period. In my experience, one to three months to the end of the month is common. With 12-month contracts that auto-renew, a missed deadline can mean another full year – check the date carefully.
• Auto-renewal clauses. Some contracts silently renew for the original term if you do not cancel in time.
• Handover provisions. Does the contract state what gets handed over at the end? If not, request the handover in writing together with your cancellation.
• Usage rights to assets. Ad copy, images, videos: clarify whether you may keep using them. Some agencies reserve rights to creatives they produced.
• Billing transition. If your ad budget runs through the agency, your own payment profile must be in place by the cut-off date – otherwise your campaigns stop abruptly.

Cancel in writing, keep it factual, and explicitly ask for an orderly handover. A hostile break-up makes every handover harder, and you will still need the agency's cooperation for a few weeks.

Data Handover: The Step-by-Step Checklist

This is the handover in the right order:

1. Clarify ownership – written confirmation that the account belongs to you (or clarity that it does not).
2. Secure admin access – Google Ads, GTM, GA4, Merchant Center if relevant, all on company logins.
3. Export your data – account backup via Google Ads Editor, reports, conversion documentation.
4. Check the contract and cancel on time – in writing, with a handover date.
5. Choose your new team – during the notice period, not after it.
6. Switch the payment profile – if billing previously ran through the agency.
7. Link the new agency via manager account – they request access using your customer ID, you approve it in the account.
8. Hold a handover call – ideally old agency, new team and you together: open experiments, quirks, lessons learned.
9. Remove the old agency – unlink the old manager account, deactivate personal logins, revoke GTM and GA4 permissions.
10. Verify tracking – after the handover, check that conversions are still coming in correctly. In my experience, this is exactly where most data gets lost during switches.

Keep this checklist permanently: the best insurance for any future switch is keeping ownership and access clean from day one.

The Transition Phase: How to Avoid a Performance Dip

Now for the question everyone asks: does performance collapse during a switch?

The honest answer: it depends on what changes technically.

Best case – the account stays in place. If only the management changes, nothing changes for Google's systems at first. Campaigns keep running, Smart Bidding keeps its learning history, and there is no automatic reset. A good new team deliberately changes little in the first weeks: analyze first, then optimize step by step. Radical rebuilds right after the takeover – a new bidding strategy, a halved budget, a new account structure – do trigger new learning phases and can temporarily depress performance.

Hardest case – a full account rebuild. If the old account belongs to the agency, you start in a fresh account with no conversion history. Honestly put: the bidding automation has to learn from scratch, and in my experience you should expect several weeks of fluctuating performance until enough conversion data has accumulated. How quickly things stabilize depends heavily on conversion volume – an account with hundreds of conversions per month learns faster than one with ten. Do not believe anyone who promises that a restart will be "seamless".

Three things soften the transition phase:

• Plan an overlap. Start onboarding the new team while the old one is still active. One or two weeks of parallel knowledge are worth more than any documentation.
• Tracking first. Before anything gets optimized, conversion tracking must be verified. Optimizing on broken data is worse than not optimizing at all.
• No ad pause. Completely pausing campaigns between agencies looks thrifty but costs momentum – after a restart, learning processes partly begin again.

The Right Questions for the New Agency

Switching is only worth it if the new team is better than the old one. You will find the full list of questions in the guide Hiring a Google Ads agency: 10 questions – after a switch specifically, I would additionally ask:

• "Do you work in my account or in yours?" (Anything other than "in yours" is a deal-breaker – you do not want to repeat the problem.)
• "What do you change in the first 30 days – and what deliberately not?"
• "How do you handle the existing learning history?"
• "What access do I have myself, at any time?"
• "What does your reporting actually look like – show me an anonymized example."

Also think about the fundamentals: does it have to be an agency again? Depending on budget and internal resources, a freelancer or in-house management can fit too – you will find the trade-offs in the comparison agency vs. freelancer and in the article Google Ads: do it yourself or hire an agency.

And if you are unsure whether a switch is even necessary: a neutral second opinion often creates more clarity than months of second-guessing. An independent Google Ads audit (fixed price from €500) shows you in black and white how well your account is actually being managed – sometimes the outcome is simply: "Stay where you are."

Frequently Asked Questions

Who owns my Google Ads account after I cancel?

That depends on who originally created the account and what your contract says. If the account was set up with your email address and your payment profile, it belongs to you – the agency only accesses it through their manager account (MCC) and can be removed after cancellation. If the agency created the account within their own structure, it often legally belongs to the agency. Clarify this before you cancel, not afterwards.

Can I take my Google Ads campaigns to the new agency?

Yes, if the account belongs to you: the new agency is simply linked via their manager account and continues working in the existing account – campaigns, history and conversion data are preserved. If the agency owns the account, you can export campaign structures via Google Ads Editor and import them into a new account, but the learning history and performance data will not come with you.

Will I lose my campaign data when switching agencies?

Not necessarily. If your Google Ads account stays in place and only the management changes, all data, conversions and the change history remain intact. Data loss mainly threatens when the account belongs to the agency and gets closed, or when GA4 and GTM run on agency-owned accounts. That is why you should secure admin access to all systems and export key reports before cancelling.

How long does switching Google Ads agencies take?

In my experience you should plan roughly four to eight weeks for an orderly switch: waiting out the notice period, transferring access, onboarding the new team and a short transition phase with some overlap. The purely technical handover – linking the manager account, adjusting permissions – can be done in a day once all access questions are settled.

Does Google Ads restart the learning phase after a switch?

If the account stays in place and the new team optimizes carefully, there is no automatic restart of the learning phase. Major rebuilds such as new bidding strategies, heavily changed budgets or a new account structure do trigger new learning phases – as does a complete account rebuild. Plan such changes step by step and the risk of a performance dip stays manageable.