ERP implementations rarely come in at the cost budgeted on day one. Software licenses and vendor fees are very visible in ERP implementation budgets, but the actual cost of the project tends to reveal itself during data migration and training phases later in the rollout. 

We’ve worked on enough Dynamics 365 F&O projects to see these patterns repeat themselves, and the costs that catch teams out almost always come from the work surrounding the software, rather than the software itself. 

Here are the hidden costs we most often see in D365 F&O implementation projects, and how we help to reduce them.

How much does a D365 F&O implementation cost? 

The average ERP budget (including discovery, design, configuration, data migration, integration, testing, training and support for go-live) varies by industry and company size. For many organizations the cost hundreds of thousands of dollars or more depending upon its business needs. For a larger enterprise, the costs can easily reach into the millions.  

But that’s not the end of it. It’s the indirect costs where projects most often drift off budget.

What are the hidden costs of a D365 F&O implementation? 

There’s a big difference between the cost you calculate during the planning phase and the actual cost of an ERP implementation. Here are the hidden costs we see eating into ERP implementation budgets:

The customization burden 

Most ERP systems need at least some customization to fit the way the organization operates. However, when a few tweaks turn into a major development effort that spans many months, costs quickly climb.  

Each customization adds an upfront cost, but there’s a longer-term issue to consider: the technical debt customizations inevitably create. Customizations are not a one-time job – they need to be maintained and tested with every D365 F&O update.  

A pattern we often see is teams intending to customize their new ERP to match existing processes, rather than questioning whether those processes are still the best approach. The result is a system that mirrors the inefficiencies of the old ways of working, just with a higher license fee attached. 

The fit-to-standard approach almost always pays off by minimizing customizations and adapting business processes to the system. This is one of the most reliable ways to keep costs under control.  

Microsoft recommends this approach for D365 F&O, and the platform is designed around the assumption that extensions will be lightweight. This is why we map every client’s processes against standard functionality first, and only customize where there’s a clear reason to do so. 

Data migration delays 

Migrating data from legacy ERP systems is one of the most consistently underestimated parts of any ERP project. The cleansing and validation work that comes before migration almost always takes longer than expected – it can take anywhere from several weeks to several months. 

In our experience, the issues most teams underestimate are duplicate records and historical data that nobody knows whether to keep. Each of these issues needs to be resolved well before migration is due to start, and the work tends to fall on people with already long to-do lists. 

Two things help here: start the data cleansing process months before the migration, and be specific about what needs to be carried over to the new system. For example, migrating a decade’s worth of transactional data is rarely necessary and needlessly inflates storage and licensing costs.

Training, change management and the inevitable productivity dip 

ERP training tends to be budgeted as a single event near the go-live date. In practice, however, it’s an ongoing requirement that needs to cover many users of different technical proficiency levels, not to mention the staff turnover that happens during a long project like this.  

Then there’s organizational change management (OCM) to factor into the budget. OCM covers the work that comes with preparing employees for new ways of working, including end-user training and resistance management. With 70% of change programs failing to meet their goals, a defined budget and strategy for training and change management can make all the difference. Employees who have used the same systems for years don’t automatically embrace new ones, especially if no one has explained why the change is happening or what’s in it for them.  

There’s also a temporary productivity cost that comes with implementing a new ERP system. Organizations typically see a 10% to 25% productivity drop for three to six months after go-live as users adjust to unfamiliar processes.  

For a 100-person business, that loss can easily run into the hundreds of thousands before the productivity gains that come with a new ERP start to kick in. We factor this into the case we help clients build, and we plan rollouts to avoid going live during peak periods where the productivity hit would be hardest to absorb.

Internal resourcing gaps that need to be filled 

Almost every ERP project requires more internal effort than initially planned, and resource constraints add even more pressure. Internal staff are pulled into the project alongside their normal duties, and the workload gets heavier than expected. The project either slows down, or external consultants have to be brought in to ensure the work gets done. 

This is where the right ERP implementation partner makes a big difference. A specialist team can absorb the technical workload so your staff aren’t run off their feet. Working with the ERP Mechanics team means you accomplish everything you need to without overstretching the people who keep the business running. 

Integration, ongoing maintenance and post go-live optimization 

ERP systems don’t operate in isolation. They connect to CRMs, e-commerce platforms and payment tools. Each connection has to be configured, tested and maintained, and each integration is a future maintenance commitment that needs updates when systems change. 

This is why choosing a system with easy integration matters, and that’s why we’re focused on Dynamics 365 F&O. The popular ERP system has strong native integrations with the rest of the Microsoft ecosystem, and we always look for opportunities to use them before recommending building custom interfaces. 

Post go-live costs are another area that catches teams out. Subscription fees, additional user licenses and ongoing support add to the total cost of ownership in ways the original business case didn’t fully capture. Enlisting the right support is vital to the success of a new ERP system. “Experienced consultants understand common issues and can quickly assess situations to provide effective solutions, even in more complex cases,” said Ligita Markevičienė, Support Manager at ERP Mechanics. 

Then there’s the matter of post go-live optimization. You can follow all the best practices for implementing a new ERP system, and you’ll still come out of the other side of go-live with problems that need fixing.  

The first few months after implementation will be focused on problem-solving: resolving technical issues, building confidence in the new system across the organization, and collecting as much relevant data as possible to support system improvements. And you don’t have to do it all alone, because the ERP Mechanics support team will keep your system running at its very best.

How to keep hidden ERP implementation costs down 

The costs above are easy to underestimate during the planning phase when everyone’s focused on getting the project signed off. Some of the measures that make ERP costs more predictable sit with the business itself, and others are where the right implementation partner earns their fee. The most successful projects use both.

1) Contingency planning  

This one sits squarely with the business. It’s generally recommended to put aside between 15% to 20% as a contingency reserve. For highly complex projects, the figure could be higher. Whichever figure makes the most sense, it’s important to treat it as a real reserve and not a buffer that can be spent early in the process.

2) Phased implementation 

A phased ERP implementation limits your financial and operational exposure. Rather than committing the entire budget to a single big rollout across the organization, you spread it (and the risk) across multiple stages.  

If something goes wrong (and on a complex ERP project, something will go wrong), it’s far cheaper to catch it in a single business unit rather than to discover the same issue across all departments. This is something to agree with your implementation partner early, since the right phasing depends on which areas of the business will benefit most from going first.

3) Embrace fit-to-standard where possible 

Customization is one of the single biggest drivers of avoidable costs, and this is where an experienced ERP implementation partner makes a measurable difference. At ERP Mechanics, for example, we map client processes to standard ERP functionality and challenge any customization that isn’t likely to prove valuable.

4) Prioritize post-go-live support 

Most ERP systems need some level of optimization work after go-live because processes might look different in production than they did during workshops. Planning for this work in the original engagement keeps the support relationship continuous and avoids the friction that comes with arranging one-off projects.  

At ERP Mechanics, we often build ongoing support and optimization services into our engagements, so this work is anticipated from the start, rather than treated as a surprise after go-live.

Partner with ERP Mechanics for your D365 F&O implementation 

If you’re preparing for a Dynamics 365 F&O implementation, but you need some support from people who’ve done it all before, ERP Mechanics is the ideal partner. We start with a comprehensive analysis of your business processes to identify where the biggest improvements can be made, then handle the full implementation lifecycle, from planning and configuration through to deployment and training.  

Our experience spans manufacturing, retail, financial services and other sectors, and we focus on making D365 F&O fit neatly into the systems and processes you already rely on. Ongoing support and optimization services pick up where the implementation ends, so the system keeps running at its best long after go-live.  

Considering a Dynamics 365 F&O implementation? Take our ERP Readiness Assessment to understand whether your people, processes and budget are aligned for a successful rollout.