BMW iX salary sacrifice math 2026: BIK, P11D, real take-home cost for a higher-rate taxpayer

An EV salary sacrifice scheme is a contract hire lease inside your employer's payroll.

How salary sacrifice on an EV actually works (the three tax flows)

An EV salary sacrifice scheme is a contract hire lease inside your employer’s payroll. You give up gross salary in exchange for the car, and three tax flows run at the same time.

Flow one is income tax relief: a 40% taxpayer keeps 40p on every £1 sacrificed; a 45% earner keeps 45p. Flow two is employee NI relief: 8% between the primary threshold (£12,570) and the upper earnings limit (£50,270) for 2026-27, then 2% above. Most sal-sac targets sit above £50,270, so the NI saving is just 2p per £1.

Flow three runs the other way: BIK tax. HMRC adds 4% of P11D to your taxable income for a pure EV in 2026-27. On a £75,000 iX xDrive45 that is a £3,000 benefit; a 40% taxpayer owes £1,200, or £100 a month. A fourth flow shapes the headline: employer NI at 15% from April 2026. Schemes use the employer NI saving to part-fund the car – some employers pass 100% back, some 50%, some none. Ask HR which applies; it can move the monthly gross by £40-£80.

BMW iX P11D values 2026 and the BIK math for each trim

The 2026 BMW iX line-up is three trims: xDrive45 (402 hp, from £75,405), xDrive60 (536 hp, from £93,205), and M70 (650 hp, from £119,805), per Carwow’s RRP range on 25 May 2026. The xDrive40 and M60 names are retired; xDrive45 is the post-facelift replacement and M70 supersedes the M60.

For HMRC purposes the P11D is list price plus delivery and options, minus the £55 first-registration fee, with VED excluded. Treat P11D as essentially the OTR list, then apply the 4% appropriate percentage for 2026-27.

That gives an annual BIK benefit of £3,016 on the xDrive45, £3,728 on the xDrive60, and £4,792 on the M70. A 40% taxpayer pays £1,206, £1,491, £1,917 a year respectively, or roughly £100, £124, £160 a month. A 45% earner pays £1,357, £1,678, £2,156 a year, or £113, £140, £180 a month.

Compare against the petrol equivalent: a BMW X5 M60i on a 37% BIK band with a £92,000 P11D costs a 40% taxpayer over £1,135 a month in BIK alone. That gap is the reason EV BIK rates remain the single most important number in 2026-27 company car planning.

Worked example: BMW iX xDrive45 on a 4-year, 10k-mile sal-sac

The table below shows the full math for a 40% taxpayer on a 4-year, 10,000-mile contract in 2026-27. Gross monthly figures are illustrative, adjusted from the Loveelectric 5,000-mile public quote (£889/month xDrive45) up by ~10% for the 10k-mile contract. Confirm against your scheme provider’s quote tool.

A 45% earner on the same contract sees income tax saved rise to £441 a month, with BIK cost rising to £113. Net cost: roughly £639 a month, about £30 lower than the 40% taxpayer. The additional-rate band is more tax-efficient on sal-sac, not less.

BIK rises across the contract as the appropriate percentage steps up: 4% / 5% / 7% / 9%. By year four the BIK tax on the xDrive45 reaches £226 a month for a 40% taxpayer, lifting net monthly cost to ~£795. The 48-month total is closer to £33,500 than the flat-rate £32,112.

The hidden costs: scheme exit, early termination, P11D drift if BMW lifts the price

The biggest risk: leaving your employer mid-lease. The contract sits between the scheme provider and the company, not you. Resigning triggers an early-termination event with a typical fee of three to six months of gross rentals – on a £980 gross sacrifice, a £2,940-£5,880 bill the employer may pass to you depending on leaver clauses.

Most modern providers (Octopus EV, Loveelectric) bundle early-termination insurance into the monthly figure, covering resignation, redundancy, long-term sickness and parental leave. Tusker calls it “Lifestyle Protection”. Exclusions matter: voluntary resignation in the first six or twelve months is often not covered, and dismissal-for-cause almost never is.

Second hidden cost: P11D drift. BMW UK list prices have crept up 3-5% per year on the iX since 2022. Your gross sacrifice is fixed at contract start, and the BIK percentage applies to the P11D at signing – so existing drivers are locked into the £75,405 base even when BMW lifts retail. That works in the driver’s favour.

Third: excess mileage. Standard contracts run 10,000 miles a year; going over costs 8p-18p per mile, reconciled at handback. If your real mileage looks like 14,000, switch to a 12,000- or 15,000-mile contract at signing – same logic as a PCP or HP contract.

Octopus EV vs Loveelectric vs Tusker on the iX in 2026

All three providers quote the iX with the same broad bundle (maintenance, servicing, tyres, breakdown, comprehensive insurance). The differences are at the edges.

Octopus EV bundles a home charger plus 4,000 free miles on Octopus Electroverse – worth £200-£400 a year off your post-tax electricity bill on a 10,000-mile contract. Octopus EV’s published BIK trajectory matches the post-Autumn-2025-Budget rates verbatim: 4% in April 2026, 5% in April 2027, 7% in April 2028, 9% in April 2029. They default to passing 100% of employer NI savings back.

Loveelectric runs the most transparent per-model calculator. The iX xDrive45 page shows £889 gross / £583 take-home for a 40% taxpayer on a 5,000-mile / 48-month contract (25 May 2026). The calculator separates the BIK column rather than rolling it into a single “net” figure. Contracts run through Lex Autolease and Arval.

Tusker is the oldest, with heavier presence in public-sector employers (NHS, councils, universities). Gross monthly on the iX usually runs slightly higher than Loveelectric’s like-for-like, reflecting charger inclusion. “Lifestyle Protection” early-termination cover is robust but a hard add-on on some employer packages.

You cannot mix and match: the right provider is whichever your employer uses. Ask HR what the employer NI pass-through rate is, then sense-check against the Loveelectric public number.

When the iX makes sense (and when a Polestar 3 or Mercedes EQE-SUV is the better sal-sac choice)

The iX makes sense when three conditions hold: you need genuine rear-passenger and boot space, you do at least 8,000 miles a year so the bundled insurance and servicing earn their keep, and you are a 40% or 45% taxpayer with secure employment. If all three hold, the net £600-£800 monthly for a £75,000-£93,000 car is hard to beat.

It makes less sense under 6,000 miles a year. Below that the gross sacrifice is inefficient and a used iX (a 2022 xDrive50 sits at ~£45,000 used in spring 2026) starts to look better value.

The Polestar 3 is the closest cross-shop: from £69,990 (lower P11D), same 4% BIK, quoted at roughly £820 gross / £510 take-home on Octopus EV for a 40% taxpayer on 5,000 miles – £80-£120 lower than the iX. Trade-off: tighter rear seat, smaller boot. The Mercedes EQE-SUV matches the iX on BIK math but pips it on range (358-mile WLTP vs 312), worth one fewer rapid-charge stop per long trip. The iX keeps the real-world edge on ride and cabin space.

Related reading

• Company car tax 2026-27: the UK EV BIK guide.
• PCP vs HP in the UK in 2026.
• Best electric SUV under £30k in the UK in 2026.
• PCP early settlement in the UK in 2026.
• UK GAP insurance after the FCA pause.
• All CDE EV coverage.