Every technology vendor makes switching to their platform sound easy. “We’ll handle the migration. Our import tools will bring your data right over. Most customers are up and running in weeks.”

If you’ve actually been through a major platform migration, you’re probably laughing. Or crying.

The reality of moving from one platform to another is consistently underestimated by everyone involved. Vendors downplay it because complexity doesn’t sell. Internal champions downplay it because they want the project approved. And IT teams often don’t fully grasp the scope until they’re knee-deep in data mapping spreadsheets at 2am.

The Hidden Costs

The visible costs are straightforward: new licences, implementation services, training. These are the numbers in the business case. They’re also typically the minority of total costs.

Data cleanup and mapping. Your existing data is messier than you think. Field names don’t match. Records are duplicated. Historical data uses formats the new system doesn’t support. Someone has to make thousands of mapping decisions, each one requiring understanding of both the old system and the new one. A 2025 study by Information Age found that data migration typically consumed 40-60% of total project effort in Australian enterprise technology transitions.

Lost institutional knowledge. Every system accumulates workarounds, custom reports, and undocumented processes that people depend on. When you migrate, these need to be recreated. The problem is that nobody has a complete list. You discover them when someone can’t do their job and asks where their custom report went.

Productivity dips. Even the best migration creates a period where people are less productive. Learning new interfaces, adapting workflows, dealing with teething problems. Multiply a 20% productivity reduction across 500 people for three months and the cost is substantial.

Integration rework. Your old platform connected to other systems through APIs, file transfers, or middleware. Every one of those connections needs to be rebuilt. And each has its own quirks, authentication methods, and data formats.

The Timeline Fiction

Vendor timelines are fiction. Not because vendors are dishonest, but because they’re quoting best-case scenarios with clean data and standard configurations. Your data isn’t clean. Your configuration isn’t standard.

A reasonable rule of thumb: take the vendor’s timeline and double it. The Australian Computer Society’s 2025 project management survey found that 67% of technology migration projects in Australia exceeded their original timeline by more than 50%. Only 12% came in on schedule.

When Migration Makes Sense

None of this means you should never migrate. Sometimes the current platform is genuinely end-of-life, the vendor is going out of business, or the technology creates serious operational or security risks.

Sometimes the business has changed fundamentally and existing tools can’t support new requirements regardless of investment.

The key word is “genuinely.” Run the numbers honestly. Include the hidden costs. Build in contingency. Then decide.

The Migration Playbook

If you do proceed, here’s what improves your odds.

Audit everything first. Before you commit, do a thorough inventory. Every data field, every integration, every custom report, every automated workflow. The audit is boring and time-consuming, but far cheaper than discovering surprises mid-migration.

Clean data before you move it. Migrating dirty data into a new system just gives you the same problems in a new place, plus new problems from the migration itself.

Run parallel systems. Keep the old system running alongside the new one for longer than you think necessary. People need a fallback. Historical data needs to remain accessible.

Budget for post-migration fixes. The go-live date isn’t the end. Budget for at least three months of intensive support and remediation. Issues will surface that nobody anticipated.

The Vendor Incentive Problem

Your new vendor makes money from selling you the new platform. They’re incentivised to make migration sound easy. Your current vendor makes money from keeping you. Neither is objective.

You need independent advice from people who don’t have a financial stake in which platform you choose. If you engage consultants, check whether they have partnership agreements with the vendors you’re evaluating.

Ask the Right Question First

Before you start any migration, ask: what problem are we actually solving?

If the answer is “the old system is slow” or “the interface is clunky,” those might be solvable without a full migration. Upgrades, extensions, or workflow changes might address the issues at a fraction of the cost and risk.

Migration is sometimes necessary. It’s rarely simple. And it’s almost never as cheap or fast as anyone claims. The organisations that get burned are the ones that believed the pitch without questioning the assumptions.