Most IT hardware is "plant & machinery": the Annual Investment Allowance gives 100% first-year relief on up to £1,000,000 of qualifying spend per year; expenditure above the AIA goes into the main pool at the writing-down allowance rate (18%, falling to 14% from April 2026). Full expensing may also apply for companies. This is general information, not tax advice. GOV.UK ↗
There’s a right time to refresh — and a cost to missing it
Hardware doesn’t fail on a fixed date, but the cost of keeping it climbs steadily with age on four fronts at once. OEM support gets more expensive every year after warranty (commonly +10–15% a year, up to +100% on end-of-life kit). Failure rate rises along the classic bathtub curve. Older servers waste energy — a newer two-socket server can save around 2,500 kWh a year. And aging end-user PCs quietly tax productivity, with staff on 3+ year machines measured up to ~13% less productive. Add those up and, at some point, keeping the old kit costs more than the amortised price of new — the economic refresh point.
The budget “bow-wave” — and how to flatten it
The most painful refresh mistake is timing, not cost. When a big batch of kit — bought together in one project — all reaches end of life in the same year, it spikes your capital budget: the “bow-wave”. The fix is a staggered (rolling) refresh: replace roughly 1/N of the fleet each year (about 20–25% for a 4–5 year cycle) so annual CapEx stays flat and predictable, and finance the years that still spike to convert them into level monthly cost. This planner detects spike years automatically and shows the smoothed target line so you can see exactly how lumpy your plan is.
Refresh, extend or finance — the whole-estate decision
Not everything old needs replacing now. For healthy kit that’s past warranty but not yet at end of life, third-party maintenance — typically 50–70% below OEM support (Gartner) — can safely defer a refresh a year or two. For a year that still spikes, finance flattens it into monthly cost. And end-of-support dates come from Servnet’s authoritative server and storage EOSL checkers — this planner reads urgency from them rather than guessing dates.
IT hardware useful-life & refresh-cycle reference
The sourced life bands this planner uses per asset class — the typical refresh point, a sensible min–max range, and what actually drives the refresh. Every value is editable in the tool and cited below.
| Asset class | Typical life | Range | Primary refresh driver | Source |
|---|---|---|---|---|
| Rack / tower servers | 5 yrs | 3–7 yrs | OEM end-of-support (EOSL), performance/capacity, rising failure risk | Park Place Technologies |
| Business laptops | 4 yrs | 3–5 yrs | Battery wear, performance decline, OS/security support cut-off | allwhere |
| Desktops / workstations | 5 yrs | 4–6 yrs | Performance obsolescence and OS/security support | allwhere |
| Network switches | 6 yrs | 5–8 yrs | Vendor EOL/EOSL, port-speed & PoE budget, campus/Wi-Fi refresh | Evernex |
| Routers & firewalls | 5 yrs | 3–7 yrs | Security workload growth, threat/IPS updates, throughput & EOL | roctelecom |
| Storage arrays (SAN/NAS) | 5 yrs | 3–7 yrs | End-of-support/rising maintenance, capacity/performance, drive wear | Arcserve |
| UPS / batteries | 4 yrs | 3–5 yrs | VRLA battery fade to 80% capacity (heat-accelerated); ~300 cycles | Vertiv |
| Wi-Fi access points | 5 yrs | 3–7 yrs | Wi-Fi standard transitions (6E/7) and firmware/security EOL | roctelecom |
The economics of an aging estate (verified)
Once the warranty ends, OEM maintenance gets steadily more expensive — a primary trigger to refresh or move to third-party maintenance.
Keeping still-reliable post-warranty kit is far cheaper via TPM than renewing OEM support — the lever that lets you defer a refresh safely.
Hardware follows a bathtub curve: low mid-life failures, then a rising wear-out tail. Expected downtime cost grows as the estate ages.
Newer servers do far more work per watt than 3–4-year-old units; consolidating onto fewer new nodes (~5:1) cut one datacentre’s power ~47%.
PCs older than 3–4 years make staff measurably less productive and are ~2.7× more likely to need repair — soft costs that dwarf the hardware price.
UK tax: Most IT hardware is "plant & machinery": the Annual Investment Allowance gives 100% first-year relief on up to £1,000,000 of qualifying spend per year; expenditure above the AIA goes into the main pool at the writing-down allowance rate (18%, falling to 14% from April 2026). Full expensing may also apply for companies. This is general information, not tax advice. Sources: Park Place Technologies · allwhere · Evernex · roctelecom · Arcserve · Vertiv · Helixstorm · GOV.UK · Gartner Market Guide for DC & Network TPM (50–70% saving), via Smart 3rd Party · Total IT Global · Backblaze · U.S. DOE FEMP · J. Gold Associates for Intel.
IT hardware refresh & budgeting — FAQs
How often should a business replace its IT hardware?
It varies by category, and this tool uses sourced life bands you can edit: servers ~5 years (3–7), business laptops ~4 years (3–5), desktops ~5 years (4–6), network switches ~6 years (5–8), routers/firewalls ~5 years (3–7, firewalls often sooner for security reasons), storage arrays ~5 years (3–7), UPS batteries ~4 years (3–5) and Wi-Fi access points ~5 years (3–7). Refresh is usually driven by end of vendor support (EOSL), performance/capacity, rising failure risk or battery wear rather than a fixed calendar date.
How do I forecast my IT hardware budget over the next 3–5 years?
Enter each asset group with its quantity, the year you bought it and an estimated replacement cost. The planner schedules each group to its end of useful life, places the spend in the right fiscal year and sums a year-by-year CapEx forecast with a cumulative curve — the exact artefact you need for IT budget season.
What is the CapEx "bow-wave" and how do I avoid it?
A bow-wave is when too much hardware reaches end of life in the same year, spiking your capital budget. The classic cause is a big-bang refresh forced by an OS end-of-life or audit deadline. The fix is a staggered (rolling) refresh — replacing roughly 1/N of the fleet each year (~20–25% for a 4–5 year cycle) so annual spend stays flat — and/or financing the spike year to convert it into level monthly cost. The tool flags spike years automatically.
Should I refresh, extend with third-party maintenance, or finance?
The planner gives a per-group recommendation. Kit past its maximum safe life or business-critical and past typical life → refresh now. Healthy kit that is past warranty but not yet at end of life → extend with third-party maintenance (typically 50–70% below OEM support per Gartner), deferring the refresh 1–2 years. A year whose spend spikes → finance it to flatten the budget. The tool links each recommendation to the right calculator.
Can I claim capital allowances on IT hardware in the UK?
Generally yes — most IT hardware is "plant and machinery". The Annual Investment Allowance gives 100% first-year tax relief on up to £1,000,000 of qualifying spend per year; spend above the AIA goes into the main pool at the writing-down allowance rate (18%, falling to 14% from April 2026). Full expensing may also apply for companies. The tool flags whether each year fits inside the AIA. This is general information, not tax advice — confirm with your accountant.
Why is keeping old hardware more expensive than it looks?
Because the cost of keeping hardware rises with age on four fronts at once: OEM support prices climb 10–15% a year after warranty (up to 100% at end-of-life), failure rate rises on the bathtub curve, older servers waste energy (a newer 2-socket server can save ~2,500 kWh/year), and aging PCs cost real productivity (staff on 3+ year PCs measured up to ~13% less productive). Eventually that exceeds the amortised cost of new kit — the economic refresh point.
How accurate is the planner?
The scheduling and budget maths are deterministic. The useful-life bands and aging-economics figures are drawn from named, verified sources (shown on screen and cross-checked in a fact-check pass) and are fully editable. Unit replacement costs are your own editable estimates — indicative planning placeholders, never quoted or distributor prices. It is a sound board-level plan; a Servnet specialist confirms exact pricing and options before any commitment.
Do you show hardware prices?
No — we never publish distributor pricing and real pricing depends on spec and volume. You enter your own indicative unit costs to model the budget; request a plan and we return firm pricing with finance and maintenance options across the whole estate.
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