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Network

SD-WAN vs. MPLS: The Real Cost Comparison

SD-WAN is often sold as the cheaper replacement for MPLS.

That can be true. It can also be a shallow sales pitch.

For IT Directors and CIOs, the real question is not, “Is SD-WAN cheaper than MPLS?” The better question is, “Which network design gives us the right uptime, performance, security, and flexibility at the lowest total cost?”

That answer depends on your sites, apps, users, contracts, carrier options, and risk tolerance.

MPLS still has a place in some networks. SD-WAN can lower costs and improve flexibility for many companies. But if you compare only the monthly circuit bill, you may miss the costs that actually matter.

What MPLS Really Costs

MPLS stands for Multiprotocol Label Switching. In simple terms, it is a private carrier network that connects your business locations.

For years, MPLS was the default choice for companies that needed stable site-to-site connectivity. It gave IT teams predictable performance, private routing, and carrier-backed service levels.

The main issue is cost.

MPLS is usually more expensive than broadband internet or DIA, also called dedicated internet access. It can also be slow to install, hard to change, and painful to scale.

Common MPLS cost drivers include:

  • Monthly circuit charges
  • Bandwidth tiers
  • Local access fees
  • Carrier management fees
  • Long contract terms
  • Change or upgrade fees
  • Backup circuits

Across 10, 25, or 100 sites, the spend adds up fast.

MPLS pricing also often does not match how companies use networks today.

Many apps now live in the cloud. Users need fast access to SaaS tools, cloud voice, video meetings, CRM systems, and security services. Backhauling all of that traffic through a data center over MPLS can hurt both cost and performance.

You may be paying private network rates for traffic that wants to go to the public internet anyway.

What SD-WAN Really Costs

SD-WAN stands for Software-Defined Wide Area Network.

Instead of relying on one private carrier network, SD-WAN uses software to manage traffic across multiple connections. Those links can include broadband, DIA, fiber, 5G, LTE, or even MPLS.

SD-WAN can choose the best path for each app. It can send voice over the cleanest link, route cloud traffic directly to the internet, and fail over if one connection has trouble.

A typical SD-WAN budget may include:

  • Internet circuits at each site
  • SD-WAN hardware or virtual appliances
  • Licensing per site, device, or bandwidth tier
  • Managed service fees
  • Security features or SASE add-ons
  • Implementation work
  • Ongoing monitoring and support

This is where buyers can get surprised.

SD-WAN may reduce carrier spend, but it adds platform and management costs. If those costs are not planned, the savings can shrink.

Replacing one MPLS circuit with two internet links plus SD-WAN licensing may still save money. But two premium DIA circuits, advanced security, 24/7 managed service, and a rushed migration can shrink the savings.

Compare total cost, not just circuit cost.

The Monthly Bill Is Only Step One

At the surface level, SD-WAN usually wins on monthly access cost.

MPLS bandwidth is often expensive, especially in smaller markets or older contracts. Broadband and fiber internet often deliver more bandwidth for less money. That can be a strong business case.

But do not stop there.

Ask these questions before you declare savings:

  • Do we need one internet link or two per site?
  • Are we using broadband, DIA, fiber, 5G, or a mix?
  • Does the SD-WAN license scale by bandwidth?
  • Is security included or separate?
  • Who manages changes and outages?
  • Are we still paying for MPLS during the move?

Many companies run both networks during migration. That creates overlap costs. If your MPLS contract has 12 months left, you may not see savings right away.

A good financial model shows cost today, cost during migration, and cost after the old services are removed.

Performance Risk Has a Cost

Cheaper bandwidth is not useful if your users complain all day.

Network cost must include business impact. If calls are choppy, ERP crawls, or video meetings fail, the lowest bill is not really the lowest cost.

MPLS earned its place because it was predictable. For some use cases, that still matters.

SD-WAN can match or beat that experience when it is designed well. It can measure packet loss, latency, and jitter. It can move traffic between links. It can prioritize key apps.

But SD-WAN is not magic.

If both internet connections at a site are poor, SD-WAN cannot turn them into a perfect network. If the underlay circuits are weak, the overlay will struggle.

When comparing SD-WAN and MPLS, look at voice quality, cloud app response times, users per site, critical systems, local ISP reliability, support response times, and last-mile diversity.

A low-cost broadband circuit may be fine for a small office. It may be a bad fit for a high-volume contact center.

Redundancy Changes the Math

One of the biggest SD-WAN benefits is redundancy.

With MPLS, many companies paid for one primary circuit and maybe one backup. Backup was often expensive, underused, or not tested enough.

With SD-WAN, you can use two or more links at the same time. For example, a site might use fiber as the primary connection and cable broadband or 5G as the backup. In many cases, both links can carry live traffic.

This can improve uptime and make the cost easier to justify.

But redundancy is not free.

You may need a second circuit, separate carriers, different physical paths into the building, cellular equipment, better monitoring, and regular failover testing.

The cheapest backup circuit may share the same path as your primary circuit. If construction cuts that path, both links can fail.

So the real question is not just, “Do we have two circuits?” It is, “Do we have meaningful diversity?”

Security and Management Can Shift the Cost

MPLS was often viewed as secure because it was private. Private does not mean fully secure.

Modern networks need stronger controls. Users access cloud apps. Remote workers connect from anywhere. SaaS traffic may never touch the data center. Attackers target identities, endpoints, and weak configurations.

Many SD-WAN projects now connect to SASE, secure web gateway, cloud firewall, CASB, ZTNA, or other security services.

That can raise the price. It can also replace older tools if planned well.

For example, SD-WAN plus SASE may help retire legacy VPN hardware, reduce backhaul, and simplify branch security. But if you stack SD-WAN on top of every existing tool, you may add cost without removing anything.

Management matters too.

MPLS was often carrier-managed. SD-WAN gives you more control, but someone has to manage policies, app routing, firmware updates, failover testing, security rules, carrier tickets, and reporting.

You have three common models: self-managed, co-managed, and fully managed SD-WAN.

Self-managed can cost less on paper, but only if your team has the time and skill. Fully managed costs more, but it may reduce the load on a lean IT team.

Before signing, ask who opens carrier tickets, who changes traffic policies, who monitors alerts after hours, who handles device replacement, and how fast changes are completed.

A cheaper quote with unclear support can become expensive when outages happen.

Contract Timing Can Make or Break the Case

The best SD-WAN business case can still fail if contract timing is ignored.

Many MPLS agreements have term commitments, auto-renewal language, or early termination fees. Some contracts require notice 30, 60, or 90 days before the end date.

Before you approve a migration, build a contract map:

  • Current MPLS circuit inventory
  • Monthly cost by site
  • Contract end dates
  • Notice periods
  • Early termination fees
  • Renewal risks
  • Install timelines for replacement circuits

This is not glamorous work. It is where real savings are found.

Time the migration well to avoid paying for MPLS and SD-WAN at the same time for months.

When MPLS Still Makes Sense

MPLS is not dead.

It may still make sense when you have strict latency needs between sites, legacy apps that do not handle internet variation well, weak local internet options, a clear private network requirement, competitive MPLS pricing, or migration risk that is higher than the near-term savings.

Some companies also use a hybrid design. They keep MPLS for select sites or apps while using SD-WAN and internet links everywhere else.

That can be a smart middle ground.

The goal is not to follow a trend. The goal is to build the right network for the business.

When SD-WAN Usually Wins

SD-WAN often wins when you have many branch sites, need more bandwidth for cloud apps, have high MPLS costs, want better failover, need faster site turn-up, want direct internet access at branches, or plan to modernize security with SASE.

SD-WAN can be especially strong for companies moving away from data center backhaul. If most traffic goes to Microsoft 365, Google Workspace, Salesforce, cloud voice, video meetings, and other SaaS tools, direct cloud access can improve user experience and reduce cost.

But the design must match the business.

A rushed SD-WAN rollout can create support issues, security gaps, and poor carrier choices. A well-planned rollout can lower spend and improve resilience.

A Better Way to Compare Costs

Use a total cost model instead of a simple quote comparison.

Include current MPLS monthly cost, replacement circuits, backup circuits, SD-WAN licenses, hardware, security add-ons, managed service fees, install costs, contract overlap, early termination fees, internal labor, and savings from retired tools.

Then model at least three scenarios:

  1. Keep MPLS as is
  2. Move fully to SD-WAN
  3. Use a hybrid network

This gives leadership a clearer view. It also helps avoid vendor bias. Each vendor will frame the math in a way that favors their offer. Your job is to compare the whole picture.

The Bottom Line

SD-WAN is often cheaper than MPLS, but not always in the way vendors present it.

The real savings come from better circuit choices, smarter cloud access, improved redundancy, and less dependence on expensive private networks. The real risks come from poor design, weak internet links, unclear support, security gaps, and bad contract timing.

For most mid-market companies, SD-WAN deserves a serious look. For some, a hybrid model may be best. For a smaller group, MPLS may still fit certain sites or workloads.

Do not make the decision based on one quote.

Build the model. Check the contracts. Test the carrier options. Define the support model. Then choose the network that gives your business the best mix of cost, uptime, performance, and flexibility.

If you want a vendor-neutral review of your WAN costs, carrier contracts, or SD-WAN options, Catch Advisors can help you sort through the noise. Start at catchadvisors.com.