How Much Does VoIP Save vs Landlines?

Written by Ivan Elias, Founder & Principal Advisor · Published September 14, 2026 · Updated September 17, 2026

“Save up to 60%” is the classic VoIP marketing line — and like most marketing lines, it’s true for someone. Here’s where the savings actually come from, line by line, where they leak away, and how to build an honest number for your business. (The calculator does this in a minute; this page explains what it’s calculating.)

Where the savings come from

1. Line charges collapse. Traditional service bills per line, per month, per site. VoIP bills per user with calling included. A 20-person office paying for 8 analog lines at $50–70 each ($4,800–6,700/year) moves to a ~$25/user platform where most of those line fees vanish. The rarer the line, the worse the rate — that inventory-room circuit nobody calls bills at $120/month in 2026.

2. Long-distance and toll fees mostly disappear. Included US/Canada calling on nearly every business plan; international rates drop 50–90% versus legacy carrier rates. 8x8 even includes 14 countries on standard plans. Pull your last six months of LD before you quote — pools sized to fear, not usage, are a recurring overpayment.

3. Maintenance contracts end. PBX maintenance, “move/add/change” technician visits and end-of-life hardware refreshes are replaced by admin-portal changes your team makes in minutes. A legacy PBX support contract alone commonly runs $8,000–20,000/year at mid-market scale.

4. Feature flexibility stops costing extra. Auto-attendants, ring groups, voicemail-to-email, mobile apps, call recording — features that were paid upsells on legacy systems are table stakes on modern plans. The UPSell line on your legacy invoice is the Feature Included line on a VoIP quote.

5. Consolidation savings. Many teams also retire a separate conferencing subscription, fax lines, or SMS platforms once calling lives in one platform. Run a tool inventory before you quote — the kill list is real money.

Where savings leak away

Four leaks account for nearly every “VoIP cost us more” story:

• Over-built implementations — paying enterprise tiers for features nobody uses, or buying a contact-center license for staff who answer four calls a day. Tier the deployment: not every seat needs the same plan.
• List-price contracts — signing the first quote instead of making the market compete. Quotes for identical requirements routinely spread $400+/month at 25 seats; the spread is the negotiation margin. (The price-per-seat benchmarks show published list for every major platform, tracked over time; the headline numbers are collected as citable statistics.)
• Bad hardware bets — expensive proprietary phones when software apps would do. With hybrid work, half your seats may only need a softphone license.
• Internet that isn’t ready — without adequate bandwidth and QoS, call quality problems erase goodwill (and sometimes force redundant connections). Budget the circuit upgrade honestly; it’s cheaper than the churn.

The hidden costs to budget for

An honest savings number nets out three one-time costs:

• Implementation labor — your team’s time for discovery, porting prep and cutover. Typically 2–6 internal hours per site for a standard deployment.
• The training dip — two weeks of reduced efficiency while muscle memory reforms. Real, temporary, and shorter with a vendor who actually trains.
• Dual-running — most deployments run old and new service side by side for one porting cycle. One overlapping month is standard; two is negotiable.

The honest math

First, total your real baseline. Legacy phone spend is spread across more budget lines than the phone bill: analog/PRI line charges, long-distance, PBX maintenance and move/add/change invoices, feature upsells, conferencing, fax services, and the wireless plans that exist because the desk phones don’t reach people. Pull the last three months of every line and average them — single-month snapshots routinely miss usage spikes and quarterly items.

For a 25-user company, the before/after typically looks like this:

Call it $6,000–8,500/year saved, with the recurring saving repeating every year of the contract’s life — and the one-time costs (implementation, hardware, dual-running) typically pay back inside the first two quarters.

How the structure shifts as you scale:

• 10–25 seats: savings are mostly line-charge and long-distance collapse. Simple deployments, fast payback, and the negotiation matters less because the totals are small.
• 50–150 seats: maintenance, hardware and consolidation savings join in — this is the tier where expense audits and structured quotes via an RFP pay for themselves many times over.
• 250+ seats: rate benchmarking dominates. At that scale, the spread between list and market price is worth more than every feature decision combined, and contract terms (escalation caps, exit rights) outvalue everything else on the quote.

When VoIP doesn’t save money

Honesty requires the exceptions: a single-line office with no usable internet already in place; sites where redundant high-availability internet is impractical; and businesses that bought their PBX recently enough that depreciation hasn’t caught up. If your circuit budget to support VoIP exceeds the savings, the migration isn’t ready — fix the network first, then revisit.

The single biggest lever

The provider matters less than the process. The same 25-user company can see quotes spread $400+/month between vendors for equivalent outcomes — and the negotiated rate is the gift that repeats every month of the term. That spread is why we broker competing quotes for every client: providers fund advisors from marketing budgets, so the whole playbook — RFP, competition, negotiation, invoice audit — costs you nothing but the decision. Start here.