When Should Your Business Replace Its Computers?

Most businesses should replace desktops every 4 to 5 years and laptops every 3 to 4 years. That is the baseline from most IT lifecycle research. But the honest answer is that a lot of businesses are not doing this, and the costs of waiting show up in places that never appear on a hardware budget: slow employees, mounting repair bills, and an operating system that has not received a security patch in nine months.

A Lansweeper analysis from July 2026 found that 21.4% of Windows devices at small and midsize businesses are still running Windows 10, which Microsoft ended support for in October 2025. One in five business machines is running an OS that no longer receives security updates. The average Windows 10 device now carries 1,903 active security vulnerabilities. The average Windows 11 machine carries 652.

That gap widens every month.

How Long Business Computers Actually Last

Industry guidance on hardware lifecycles is more consistent than you might expect. The disagreement is usually about where in the range to set your own target, not about the range itself.

Desktops: 4 to 5 years. General office workers pushing email, browser tabs, and productivity apps can usually stretch to the high end. Users running heavier workloads tend to hit performance walls closer to four years.

Laptops: 3 to 4 years. Battery degradation accelerates the timeline. A laptop that technically runs fine at year four often has a battery that lasts 90 minutes and a chassis that is starting to show stress. Add the weight of daily commuting and that useful life shrinks.

Servers: 4 to 5 years, tied closely to manufacturer warranty coverage. Once a server is out of warranty, a failed component becomes a search for parts that may no longer be stocked. That is a worse place to discover a problem than mid-quarter with a team waiting to get back online.

Network gear (firewalls, wireless access points): 5 to 7 years. The trigger here is usually feature requirements rather than hardware failure. The gear may still power on, but it may not support current security standards, throughput demands, or segmentation requirements.

Managed switches: 7 to 10 years. The longest-lived category in most environments.

Mobile devices: 2 to 3 years. Operating system update eligibility ends sooner here, and battery degradation is more aggressive given the charge cycles.

What It Costs to Wait (The Numbers Most Businesses Miss)

The visible cost of an aging computer is what you paid for it, which by year four is zero. The invisible costs are what make the math worth running.

Consider an employee losing 15 minutes a day to slow boot times, application lag, and the occasional freeze. At $25 per hour in loaded labor costs, that is more than $1,500 per year, per machine. A 30-person team with half the machines past their refresh date is a real number.

IDC research found that server operating costs triple after year three. Average annual costs in the first three years run around $7,541. After year three, that figure climbs to $22,511. The equipment did not get three times harder to run. But failure rates accelerate, parts become harder to source, and IT time shifts toward keeping things alive rather than supporting growth.

A Microsoft study found that PCs over four years old are 2.7 times more likely to need repairs than newer machines, and that each repair incident costs an average of 112 hours in lost productivity. At $25 per hour, that is a $2,800 swing from a single incident, not counting the repair itself. The same study found that annual maintenance costs on four-plus year old machines are often enough to purchase two new computers.

None of those costs show up when someone asks "do we really need to replace these yet?"

The Windows 10 Problem in 2026

Microsoft ended Windows 10 support on October 14, 2025. Any machine still running it is now collecting unpatched vulnerabilities with no fix coming unless the business pays for Extended Security Updates, which cost $61 per device for the first year, $122 for the second, and $244 for the third. If you miss the enrollment window and try to catch up later, the fees are cumulative.

The math: three years of ESU coverage costs $427 per device. That is money spent to delay a replacement on hardware that is still slow, still aging, and still accumulating maintenance costs on top.

Windows 11 also has hard hardware requirements. It requires TPM 2.0 and a processor from Intel's 8th generation or newer. Any machine that does not meet those specifications cannot run Windows 11, regardless of how well it otherwise performs. For those machines, replacement is not optional, it is the only path to a supported operating system.

The question to ask about every Windows 10 machine in your fleet right now: can it run Windows 11? If yes, upgrade. If no, it needs to go on a replacement schedule.

Upgrade or Replace: How to Decide

Not every aging machine needs immediate replacement. A targeted upgrade can extend useful life by two to three years for the right hardware.

The test for whether an upgrade makes sense:

• Is the processor 8th-generation Intel Core or AMD Ryzen 2000-series or newer? If yes, the CPU still has productive life. If not, no upgrade will fix the fundamental bottleneck.
• Can a RAM and SSD upgrade bring the machine to 16 GB RAM and NVMe storage for under $200? If yes, that is generally a strong return. If the motherboard cannot support the upgrade, you are stuck.
• Can the machine run Windows 11? If not, replacement is the answer regardless of how the first two questions go.

If repair costs on a given machine have exceeded 50% of its replacement cost in the past year, replace it. Spending money to keep old hardware alive is a predictable losing position.

Building a Refresh Plan That Does Not Crater Your Budget

The biggest mistake in hardware refresh planning is treating it as a once-every-five-years event. That creates a situation where everything ages together, fails together, and needs to be replaced all at once with a budget that was not designed for it.

The alternative is a rolling refresh cycle.

Aim to replace roughly 20 to 25% of your workstations each year. On a 40-machine fleet, that is 8 to 10 machines per year, which is manageable, predictable, and keeps the fleet continuously current. You never have everything aging simultaneously.

Build your budget by dividing replacement cost by expected lifecycle. A $1,200 laptop over four years is $300 per year per machine. A $900 desktop over five years is $180 per year. Assign those figures to a line item in your annual IT budget and fund it consistently, the same way you would reserve for any other equipment with a known lifespan.

Add 15 to 20% above hardware costs to account for the soft costs most businesses forget: setup, configuration, data migration, and the hour or two it takes to get each person back to full productivity on a new machine.

The starting point for all of this is a current inventory. Every device, its purchase date, its warranty expiration, and whether it can run a supported operating system. Without that list, you are guessing.

Most businesses that manage this well do not do it entirely on their own. Tracking asset age, support dates, warranty cliffs, and replacement timelines across a 30- or 50-machine environment is a job that gets pushed to the backlog until something breaks. That is usually when the real cost shows up.

Frequently Asked Questions

How often should a business replace its computers? Desktops every 4 to 5 years and laptops every 3 to 4 years covers most office environments. The exact timing depends on workload intensity, the user's role, and whether the machine still runs a supported operating system. Once a device cannot run Windows 11, its useful life is effectively over regardless of age.

Can I just upgrade RAM and storage instead of replacing? Sometimes. If the machine has an 8th-generation Intel processor or newer, can be brought to 16 GB RAM and NVMe storage for under $200, and can run Windows 11, an upgrade is usually the right call for machines 3 to 5 years old. For anything older than that, or anything that fails the Windows 11 compatibility test, replacement wins on cost over any 3-year horizon.

What happens if my business computers can't run Windows 11? Those machines are running Windows 10, which Microsoft stopped patching in October 2025. Extended Security Updates cost $61 per device per year to start and double annually. That is a temporary bridge, not a fix. The hardware needs to be replaced, and the sooner that gets on a budget and a timeline, the less disruptive the transition.

How do I build a hardware refresh plan without a dedicated IT department? Start with an inventory of every machine, its purchase date, and its warranty status. Group machines into replacement cohorts by age. Budget to replace 20 to 25% per year. A managed IT provider can build and maintain this inventory for you and flag machines before they become a problem, which is usually cheaper than discovering the need through a failure.

How do I know if a slow computer is worth fixing? If repair costs on a machine have exceeded 50% of its replacement cost in the past year, replace it. If the machine is more than six years old, replacement is almost always the better financial decision even before running that calculation. The hidden cost is the productivity loss you are paying every day the machine stays in service.