Where the three-year rule comes from
Most IT providers will tell you to replace every laptop every three years. The rule is not invented. It comes from two places: business laptop warranties usually run three years, and most accounting rules let you depreciate IT equipment over three to five years, so finance teams line the refresh cycle up with the depreciation schedule.
That works for a company with 500 laptops, volume discounts and staff whose job is imaging and retiring machines. For a 15-person business it is a lazy heuristic. Every laptop has a name, a user and a story, and the honest question is not "is this machine three years old?" but "is it costing us more to keep than to replace?"
The real cost is not the purchase price
A laptop's cost is the purchase price plus setup, support, downtime, repairs after the warranty ends, and the productivity you lose while someone waits for it. From our own onboarding work across teams of 5 to 50 people, a €1,200 business laptop lands somewhere between €2,500 and €4,000 in total cost over five years, and the shape of that curve matters more than the total.
The pattern we see, using our own ranges rather than a vendor model:
| Cost component | Year 1 | Year 2 | Year 3 | Year 4 | Year 5 |
|---|---|---|---|---|---|
| Purchase price | €1,200 | - | - | - | - |
| Setup and imaging | €150 | - | - | - | - |
| Support tickets | €60 | €80 | €120 | €200 | €320 |
| Downtime | €40 | €60 | €100 | €180 | €280 |
| Repairs after warranty | €0 | €0 | €0 | €180 | €350 |
| Lost time on a slow machine | €0 | €0 | €50 | €150 | €300 |
| Year total | €1,450 | €140 | €270 | €710 | €1,250 |
Years 4 and 5 are the interesting columns. Support roughly doubles, downtime rises with it, and the cost nobody measures - people waiting on a slow machine - starts to dominate. The hourly rate you should use for that waiting is not a guess: Eurostat publishes hourly labour costs by country, and using your own country's figure keeps the sum honest[1].
When replacing early wastes money
If your team lives in a browser, Microsoft 365 and a CRM, a four-year-old laptop is usually fine. The processor is not the bottleneck. The battery often is, and a €60 battery buys another 18 to 24 months.
For 15 people at €1,200 a machine, one skipped cycle is €18,000 that stays in the business. Over a decade, moving from a three-year to a four-year cycle skips roughly one full refresh.
When keeping old machines costs more
The curve flips for teams running heavy software locally: CAD, video editing, local databases, virtual machines. There, a four-year-old laptop is not just slower, it is quietly expensive. Fifteen minutes lost per person per day is about 60 hours a year, and at a loaded €40 an hour that is €2,400 per person. Against that, a €1,200 replacement is not a cost, it is the cheaper option.
Security is the other flip. Windows 11 requires TPM 2.0, UEFI Secure Boot and a supported processor, so machines that cannot meet those requirements are not a budgeting question at all - they are a replace-now question[2].
The framework that actually works
Replace on triggers, not birthdays:
| Trigger | Action |
|---|---|
| Under warranty, no complaints | Keep |
| Warranty expired, under 3 tickets a year | Replace the battery, review in 6 to 12 months |
| More than 5 tickets a year, or a paid repair due | Replace |
| User loses more than 10 minutes a day waiting | Replace |
| Cannot meet the Windows 11 hardware requirements | Replace now |
| Battery degraded and the machine is past 3.5 years | Replace, the battery is not worth it |
You do not need a spreadsheet to run this. Intune already reports device inventory, hardware detail and compliance state for every enrolled machine, which is the data these triggers need[3]. Set a review at 36 months and a mandatory decision at 48.
In our own engagements this saves roughly a fifth to a third against a rigid three-year cycle, because it replaces the machines that are costing money and leaves the ones that are not.
The procurement cost nobody counts
Every purchase round costs someone 8 to 15 hours: researching models, chasing quotes, configuring, imaging, deploying, retiring the old unit. Global device spending keeps rising, which is exactly why the overhead per round is worth designing out rather than absorbing[4].
Two things fix most of it. First, buy on a rolling cycle - five machines a year rather than fifteen every third year - so the cash flow smooths out and nobody faces a month where the whole team needs a laptop. Second, standardise on two models, a standard and a premium, and never buy anything else. Every extra model adds driver management, dock incompatibility and image variations, and that overhead is monthly, not one-off.
Do not forget the disposal
A retired laptop is still a data protection obligation. The GDPR requires appropriate security for personal data through its whole lifecycle, and that includes the disk in a machine you are giving away[5]. Use a certified disposal service that issues a destruction certificate, and never donate or resell a machine that has not been wiped to a documented standard.
Actually
The three-year rule is not wrong, it is just not a decision. Track tickets, waiting time and Windows 11 eligibility, and the replace list writes itself.
If you want your current fleet mapped against this framework - which machines to keep, which to replace, and what the next 12 months of procurement looks like - book a free 30-minute call.