The "is an EV cheaper?" debate is usually settled badly — either by an enthusiast quoting fuel costs only, or by a sceptic anchoring on sticker price. The honest answer requires the full five-year picture: purchase, fuel/electricity, motor tax, servicing, insurance, tyres, depreciation, and (if relevant) the cost of installing a home charger. Below, that picture for two like-for-like cars an Irish buyer might cross-shop in 2026.
The two cars
- EV: Volkswagen ID.3 Pro (58 kWh, ~420 km WLTP). New, €33,500 list, €30,000 after SEAI grant.
- Diesel: Volkswagen Golf 2.0 TDI (Style trim). New, €31,500 list. Equivalent body type and rough-equivalent spec.
Both kept for five years and 70,000 km (14,000 km/year), bought outright with cash to keep the comparison clean. Both with a typical driver profile (35-year-old, full no-claims, suburban Dublin postcode).
Five-year cost breakdown
| Cost line | VW ID.3 Pro (BEV) | VW Golf 2.0 TDI | Difference |
|---|---|---|---|
| Purchase price (after grant) | €30,000 | €31,500 | €1,500 lower (EV) |
| Fuel / electricity (5 years) | €2,400 | €9,100 | €6,700 lower (EV) |
| Motor tax (5 years) | €600 | €1,350 | €750 lower (EV) |
| Insurance (5 years) | €3,400 | €2,800 | €600 higher (EV) |
| Service & maintenance | €1,100 | €2,100 | €1,000 lower (EV) |
| Tyres & consumables | €920 | €780 | €140 higher (EV) |
| NCT & misc | €160 | €160 | €0 |
| Home charger (install net of grant) | €1,300 | €0 | €1,300 higher (EV) |
| Estimated value at year 5 (resale) | €14,800 | €13,500 | €1,300 higher (EV) |
| 5-year net cost of ownership | €25,080 | €34,290 | €9,210 lower (EV) |
Net of everything, the home-charged BEV is roughly €9,200 cheaper to own over five years on these assumptions, or about €1,840 a year. The headline driver is the fuel cost gap (€6,700 over five years); the next biggest is service and maintenance (€1,000); the third is depreciation (~€1,300 in the EV's favour, though this is the most volatile assumption).
Where it gets interesting: the assumptions that flip the answer
Not every buyer fits the above profile. Two scenarios where the diesel comes out ahead, or close to ahead:
1. No home charging, public-only
If you have to do all your charging on the public network at typical €0.50/kWh weighted average, the EV's five-year fuel cost rises from €2,400 to roughly €6,000. That's a €3,600 swing. The home-charger cost line disappears (~€1,300 saving). Net effect: the EV is now ahead by ~€6,900 instead of €9,200 — still ahead, but less commandingly. If the public-charging tariff trends toward €0.65/kWh (Ionity-only on a Donegal-frequent driver), the gap narrows to ~€4,500.
2. Low annual mileage
At 7,000 km/year (half our base case), all the EV's running-cost wins shrink proportionally. Five-year fuel saving falls from €6,700 to ~€3,400. Service saving from €1,000 to ~€500. The picture: the EV is ~€5,000 cheaper, not €9,200. Still positive, but if the driver is at 5,000 km/year and uses public charging, the EV/diesel gap effectively closes to zero.
3. Long single trips, sub-15,000 km/year
If your annual mileage is dominated by occasional long single trips (e.g., a Dublin-based driver who does 12,000 km/year of which 8,000 is monthly Cork visits), and you don't have home charging, a modern diesel still has a workable case — especially if you'd otherwise be replacing the diesel with a 60 kWh BEV that needs a charge stop on each Cork run.
4. Used vs new
The above is for two new cars. The case for a used 2022–2023 EV vs a used 2022–2023 diesel is even more lopsided in the EV's favour: the EV has already taken its worst depreciation hit, you keep all the running-cost wins, and the BIK regime (for company-car drivers) is moot.
The home-charger payback alone
If you take everything else off the table and look just at the home-charger install vs not installing one:
- Cost of install (after €300 SEAI grant): ~€1,300.
- Annual saving vs public-only charging: ~€1,170 (at our base 14,000 km/year).
- Payback: 13 months. Three-year ROI: roughly €2,200.
Net-net: if you're driving an EV in Ireland and you have off-street parking, installing a home charger is the highest-ROI piece of EV-related capex you'll do. Skipping it — whether through indecision or "I'll get to it" — costs you roughly €100/month in unnecessary public-charging spend.
The verdict
For a typical Irish buyer doing 12,000–18,000 km/year with home-charging access, the EV beats the diesel by enough money over five years to be the clear answer — even before any environmental or noise/refinement considerations. For low-mileage, public-only charging buyers, the case is more nuanced and a used PHEV or efficient diesel can still make sense.
If you're not sure which group you're in, the test is: do your worst regular trip on public charging, see how much it cost. If it was over €25 per fast-charge stop, your TCO leans toward "EV with home charging or stick with diesel" rather than "EV without home charging".