Migrating to Odoo 20: The Case, the Path, and What Goes Wrong
Odoo ERP’s latest version 20 will be officially unveiled at Odoo Experience 2026 in Brussels on 24th September 2026. There will be no shortage of coverage walking through every new screen, feature, and capability that comes with the release.
This isn't that article.
For businesses already running Odoo 15 through 19, the more important question isn't what's new in Odoo 20. It is: should we move, and when?
For some enterprises, the right answer may be to migrate as soon as they are ready. For others, waiting for another quarter may be the smarter decision. The difference comes down to what you're running today, how far you've moved from the current Odoo ecosystem, and what a migration would mean for your business.
That distinction matters. A partner willing to tell you to wait when the timing isn't right is a partner worth listening to when the answer is to go.
The Case for Migrating
Version Distance Is the Real Argument
Let’s be honest and true. The strongest reason to migrate has nothing to do with any single feature of Odoo 20. However, it is pure arithmetic.
Every release you skip makes the eventual jump bigger, adding more schema changes to reconcile and more custom code that has drifted from the modules, and a shrinking chance that the third-party apps you depend on still have a build for your version.
For example, if you are still operating on Odoo 15 or 16, you are not postponing migration but compounding a huge, burdensome task that will become much more intricate in the future.
That effort doesn't increase in a neat, predictable step with every version you skip. It tends to accelerate because customizations, integrations, workflows, and data dependencies interact with one another. What might have been a relatively contained upgrade can eventually become a much broader exercise in rebuilding, replacing, or rethinking parts of the system.
Consider the difference between moving one version forward and moving several versions at once. In the first case, you may be reconciling a manageable set of changes and validating a known collection of customizations. Several versions later, you may find yourself rebuilding integrations that were never designed for the current architecture, replacing third-party applications that are no longer maintained, and retraining users on changes they never experienced incrementally.
The work doesn't simply become bigger. It becomes different.
That is why version distance should be part of the migration conversation long before an older Odoo version becomes a business constraint.
Support and Ecosystem Currency Matter
Staying reasonably current isn't about chasing every new Odoo release.
It is about remaining within an ecosystem where the software, applications, developers, and integrations your business relies on continue to support the version you're running.
The longer a business stays on an older version, the more likely it is to encounter compatibility limitations or to maintain components that the wider ecosystem has moved beyond. The problem isn't necessarily visible on day one. The application still works. A custom module still runs. Integration still passes data.
Until it doesn't.
And when that happens, finding a compatible replacement or developer who understands an older environment can turn a small operational issue into a much larger project.
That’s why migrating to Odoo 20 can provide the right direction and path for your business.
When to Wait
Migrating well sometimes means migrating later. It's worth deferring a quarter if any of the following scenarios are true:
- A third-party app your operation depends on doesn't have an Odoo 20 build yet.
- You're heading into a year-end close or an audit window where you can't absorb the risk of a platform change.
- You already have a migration in flight and adding a second moving target only raises the odds both fail.
None of that costs you anything to admit, and it's exactly the kind of honesty that makes the rest of this article worth trusting.
The Path to an Odoo 20 Migration: The Six Phases
Once the decision to migrate has been made, the work begins with something less exciting than development: understanding the environment you're moving.
1. Start With Assessment, Not Assumptions
A migration plan is only as good as the assessment behind it.
Before timelines are discussed, the current Odoo environment needs to be understood in detail: the version, modules, database, customizations, integrations, data, and business processes that have grown around the system.
This is where the real scope of migration starts to emerge.
A relatively standard Odoo environment may require a very different approach from a heavily customized deployment connected to multiple external systems. Two companies running the same Odoo version can therefore have completely different migration projects.
That is why a timeline given before assessment should be treated as a starting estimate, not a commitment.
2. Audit the Modules and Dependencies
The next question is what the system depends on.
Standard Odoo modules are only part of the picture. Third-party applications, custom modules, connectors, payment systems, reporting tools, and other integrations can all influence whether a migration is ready to proceed.
Every dependency needs to be accounted for, and its compatibility with Odoo 20 confirmed.
This is one of the areas where migration planning can save significant trouble later. Discovering that a critical application isn't ready during the testing phase is very different from discovering it during the initial assessment, when there is still time to find an alternative or adjust the migration schedule.
Your go-live date is ultimately constrained by the least-ready critical dependency.
3. Review Customizations Before You Port Them
Custom code deserves particular attention because it often represents the largest source of migration effort.
But the objective shouldn't be to move every customization into Odoo 20 exactly as it exists today.
Some custom functionality may no longer be necessary.
Odoo has continued to expand its standard capabilities across successive releases, so a custom feature developed several years ago may now be available natively. Carrying that old customization forward simply because it already exists creates development and testing work, followed by another long-term maintenance obligation.
A proper custom code review asks a more useful question:
Does this still need to be customized?
If the answer is no, removing it can be more valuable than successfully migrating it.
4. Treat Data as Something to Improve, Not Just Move
Data migration is often described as a technical exercise: extract the data, transform it, map it, and load it into the new environment.
The technical movement is only part of the job.
Years of operating an ERP system can leave behind duplicate contacts, inactive products, outdated records, inconsistent information, and data that no longer serves a business purpose. Moving everything simply because it exists means transferring those problems into the new system.
Migration creates a rare opportunity to decide what should actually come forward.
That doesn't mean deleting data indiscriminately. It means making deliberate decisions about what needs to remain operational, what should be archived, and what no longer needs to be part of the working system.
The result should not simply be a newer Odoo database. It should be a cleaner one.
5. Test the Business, Not Just the Migration
A migration can succeed technically and still fail operationally.
The project team may confirm that data has been transferred correctly, modules are functioning, and integrations are communicating. But the people using Odoo every day will encounter situations that don't appear in a technical test plan.
A warehouse operator may have a workaround that was never documented. An accountant may follow a process that differs from the one assumed by the project team. A sales user may rely on a report or workflow that nobody thought to include in the test scenarios.
This is why user acceptance testing requires real users to run real business processes.
The objective isn't simply to prove that the new system works.
It's to prove that your business can work in the new system.
6. Plan the Cutover: What Comes After It
Eventually, testing must end, and the business has to move.
A successful cutover requires a defined window, clear ownership, cross-team communication, final data validation, and a rollback plan if something goes seriously wrong.
But the migration doesn't end when users log into Odoo 20 for the first time.
The first days and weeks after go-live are when issues that didn't surface during testing often become visible. Users encounter unfamiliar workflows. Integrations behave differently under production conditions. Small configuration issues suddenly matter because hundreds of real transactions depend on them.
That is why hyper care should be treated as part of the migration itself, not as an optional service added after the project is finished.
What May Go Wrong During the Migration Process?
Some developers may mistakenly assume their migration failed due to the wrong technology choice. The failure may be due to planning gaps, which can lead to technical issues later. We can spotlight a few reasons that can break a smooth-going migration process.
- Third-party apps that aren't ready.
If a dependency your business relies on doesn't have an Odoo 20 build, you cannot set the upgrade date; you will have to wait for the vendor to release the Odoo 20 update. The solution is simple but easy to overlook when you are under time pressure. Contact the vendor directly, ask for a clear timeline in writing, and set your cutover date based on their timeline rather than assuming the update will be ready when you need it.
- Customizations that are now standard features.
If you move a custom module that already exists as a standard feature in the new version, you will spend time and money building, testing, and maintaining something that Odoo already provides. The right approach is to review all custom code first. Check every customization against the new version’s standard features before deciding what to move.
- Data problems that move with you.
Every migration is a good opportunity to clean up data accumulated over the years. If you simply move everything to the new system, you also move all the duplicate records, old data, and inconsistencies. Add a clear data cleaning step to the migration plan. Decide what should be archived, merged, or removed, rather than assuming someone will take care of it later.
- Testing done only by the project team.
The people who worked on the migration usually test whether everything works as they planned. But they may not see what happens when a real warehouse worker uses a workaround that was never documented or faces an unexpected situation. Include real end users in UAT and let them test their actual daily tasks instead of testing only simple, planned scenarios.
- Training left until launch week.
Someone who has followed the same process for years does not need a presentation the day before go-live. They need enough practice with the new system so that the new process feels familiar before they start using it for real. Start training well before the cutover and make it part of the project plan instead of trying to fit it in at the last minute.
None of these are technical problems. They are planning problems. The good thing is that planning problems can be identified and fixed before the upgrade begins.
A Pre-Migration Checklist
Before you commit to a date, work through this:
- Document the current version, database size, and module count
- Full inventory of installed third-party apps, with Odoo 20 compatibility confirmed for each
- Custom code catalogued, with a first pass at what's now redundant against standard features
- Data cleansing scope agreed - what gets archived, merged, or dropped rather than migrated
- Integration map covering every external system that talks to Odoo
- A UAT plan that includes actual end users, not just the project team
- A training plan that starts before cutover, not during hyper care
- A defined cutover window and a sized hyper care period with named owners
- A rollback plan, even if you don't expect to need it
- A named decision-maker for "go" versus "wait another quarter"
If you'd rather work through this with someone than alone, it also works well as a structured conversation with a partner who's run the process before.
Why Surekha Technologies?
Surekha Technologies is a proud Official Odoo Partner and an ISO 9001-certified technology company, with more than 100+ successful Odoo projects delivered and team of dedicated developers covering full lifecycle, from consultation, implementation, and integration, and migration.
Our team will be at the Odoo Experience 2026 event in Brussels for the Odoo 20 keynote, including the session on Asana-to-Odoo quality migration, because we'd rather learn a launch firsthand than write about it from a livestream summary.
Planning your Odoo 20 migration? Get a clear view of your timeline with our migration assessment, including whether now is the right time to upgrade.
FAQs
Should I migrate to Odoo 20 immediately after its release?
Not necessarily. The right timing depends on your current Odoo version, customizations, third-party applications, integrations, business calendar, and readiness for testing and training.
What is the biggest challenge when migrating to Odoo 20?
The biggest challenges often come from customizations, third-party applications, integrations, and legacy data rather than migration technology itself. Assessing these areas early can prevent major issues later.
How do I know if my Odoo customizations are ready for Odoo 20?
Start with a custom code review. Each customization should be assessed against Odoo 20's standard capabilities to determine whether it should be migrated, modified, replaced, or removed.
What happens to my existing Odoo data during migration?
Your existing data can be migrated to the new environment, but migration is also an opportunity to review what should actually be carried forward. Duplicate, outdated, or unnecessary data can be cleaned up or archived before migration.
When should I wait before migrating to Odoo 20?
Waiting may make sense when a critical third-party application isn't ready; your business is entering a high-risk period; another major system change is underway, or there isn't enough time for proper testing and user training.
Why should I work with an Odoo migration partner?
An experienced migration partner can assess your existing environment, identify compatibility and customization risks, plan the migration, validate business processes, and support you through cutover and post-migration issues.
