Business energy contract inside IR35 rates UK: what to charge
A practical UK guide to setting an inside-IR35 day rate that covers your business energy contract costs (electricity/gas), plus the expenses you can’t usually reclaim. Includes worked examples, a pricing checklist, and a quick way to compare quotes for your business premises.
- Understand what “inside IR35” changes for energy cost recovery
- Use a simple rate-building method (with realistic assumptions and caveats)
- Compare business energy options without inventing rates or tariffs
Estimates only. Your actual costs depend on meter type, contract term, usage, site size, payment method, and supplier availability.
Fast answer: Business energy contract inside IR35 rates UK
For Business energy contract inside IR35 rates UK, a practical approach is to add an energy cost allowance per working day to your target take-home rate, because inside IR35 you’ll usually have limited ability to reclaim expenses. Estimate your premises’ annual energy spend, divide by chargeable days, then add a risk buffer for contract changes and standing charges.
Key takeaway 1
Inside IR35 typically means your client pays you via PAYE (or an umbrella), so you can’t rely on “expenses” to cover your office energy bill.
Key takeaway 2
Your energy contract cost depends on meter type (single-rate, multi-rate, smart), payment method, site load profile, and contract length — not just “unit rates”.
Key takeaway 3
Use a range: build a “base” allowance and a “high” allowance to protect you from renewal pricing, seasonal usage and contract terms.
Important: This page is about setting a sensible rate allowance for your business premises energy contract when you’re inside IR35. It’s not tax advice. If you’re unsure how IR35 affects your take-home pay or allowable expenses, speak to an accountant or check GOV.UK guidance.
How to build your inside-IR35 day rate to cover energy costs
If you keep a dedicated workspace (office, studio, small unit, salon, workshop or warehouse), your electricity and/or gas bills are a real overhead. Inside IR35, you generally shouldn’t assume those costs can be passed through as client-reimbursed expenses, so the simplest protection is to bake a reasonable allowance into your rate.
Step-by-step (quick method)
- Estimate annual energy cost for the premises: take last 12 months of bills (or supplier statements) for electricity and gas combined. If you’ve moved in recently, use a conservative range.
- Decide your chargeable days: a common contracting assumption is 220–230 working days/year, then reduce for non-billable time (sales, admin, holidays, sickness). Many contractors use 180–210 chargeable days for a safer figure.
- Convert to a daily allowance: annual energy cost ÷ chargeable days.
- Add a buffer: because contract renewals can change, add 10–20% buffer (or use your “high” range figure).
- Add to your target day rate: treat it like insurance against higher standing charges, seasonal heating, longer opening hours or equipment load.
Why this works: energy bills are largely fixed in the sense that you pay standing charges and baseline usage even when work is quiet. A per-day allowance helps you avoid underpricing longer inside-IR35 engagements.
Two realistic scenarios (with numbers)
Scenario A: small office / studio
Assumptions (example only): Electric-only premises; last year’s electricity spend £1,200; 200 chargeable days; add 15% buffer.
- Base daily allowance
- £1,200 ÷ 200 = £6/day
- With buffer
- £6/day × 1.15 = ~£6.90/day (round to £7/day)
Caveat: if you run high-load kit (servers, printing, HVAC), your usage can be materially higher than a typical office.
Scenario B: small workshop / retail unit
Assumptions (example only): Electricity + gas; combined annual spend £4,800; 190 chargeable days; add 20% buffer (seasonal heating + longer opening hours).
- Base daily allowance
- £4,800 ÷ 190 = ~£25.25/day
- With buffer
- £25.25/day × 1.20 = ~£30.30/day (round to £30/day)
Caveat: if your contract has higher standing charges or you have multi-rate metering, the split between “fixed” and “usage” costs can change.
What to ask your client or agency (inside IR35)
- Location of work: are you expected on-site, hybrid, or remote? Your own premises costs are more relevant when you maintain a dedicated workspace.
- Equipment & utilities: do they provide desk space, power and connectivity on-site?
- Expense policy: what (if anything) is reimbursable, and what evidence is required?
- Length & extension risk: longer engagements increase the chance of an energy renewal landing mid-contract.
Compare business energy (whole of market)
If you’re setting an inside-IR35 rate, the best evidence for your allowance is your actual quote options. Use your postcode and contact details to receive comparable business energy prices for your premises.
Tip: If you have it, keep your latest bill to hand (MPAN for electricity / MPRN for gas, contract end date, and whether you have a smart or multi-rate meter). It speeds up accurate comparisons.
Compare contract features (what matters for your rate allowance)
You don’t need to guess unit rates to price your contracting work properly — but you do need to understand which contract features can push costs up or lock you in. Use this table as a decision aid when reviewing quotes.
| Contract element | Why it affects costs | What to check before signing |
|---|---|---|
| Contract length | Longer terms can bring price certainty but may include exit fees if you move or close the site. | Any early termination charges; what happens if you relocate; renewal window. |
| Meter type / profile | Single-rate vs multi-rate and business load profile can change how you’re billed. | Whether you have a smart meter, multi-rate (e.g. day/night), half-hourly, or multiple meters. |
| Standing charges | Affects your baseline cost even when usage is low (quiet periods, holidays). | Standing charge levels and whether they differ by meter type/site. |
| Payment method | Direct debit, receipt of bill and credit terms can affect cash flow (important inside IR35). | Deposit requirements; late payment charges; billing frequency. |
| Deemed / out-of-contract rates | If you roll out of contract, costs can rise and become unpredictable. | What happens after contract end; notice periods; how to avoid being left on deemed rates. |
Inside-IR35 rate checklist (energy-focused)
This approach suits you if…
- You pay for a dedicated workspace (office/unit) and energy is a meaningful overhead.
- You’re pricing a longer inside-IR35 contract where renewal risk matters.
- Your energy usage is stable enough to estimate from prior bills.
Be careful / consider alternatives if…
- Your client provides on-site facilities and you don’t maintain a separate premises.
- You’re scaling up (new equipment, longer opening hours) — last year’s bills may understate next year’s costs.
- Your energy contract end date is near and you may face short-notice renewal pricing.
Good practice: Keep a simple “overheads schedule” for negotiations: rent, energy, insurance, software, professional fees. Even when inside IR35 limits expense recovery, it helps justify your rate requirements professionally.
Costs, exclusions and common pitfalls (UK)
When contractors underestimate energy costs, it’s often because the quote looked simple but the contract details weren’t. These are the common “gotchas” to account for in your inside-IR35 pricing.
1) Standing charges still apply
Even if you use little energy (quiet months, holidays), standing charges can keep bills meaningful. Your per-day allowance should reflect baseline cost, not just usage.
2) Renewal timing vs contract work
If your energy contract renews mid-engagement, your costs can change while your inside-IR35 rate stays fixed. Build in a buffer or plan a renegotiation point.
3) Meter complexity
Multi-rate, half-hourly, or multiple meters can affect billing patterns. If your quote is based on incomplete meter info, the final price can differ.
4) Deposits and credit checks
Some business contracts may request a deposit depending on trading history and payment risk. This is a cash-flow issue to plan for if you’re inside IR35.
5) Deemed / out-of-contract rates
If you miss a renewal window, you can end up on higher, less predictable rates. Put contract end dates in your calendar and start comparing early.
6) “Home office” vs business premises
If you work from home, energy costs are real but are treated differently from a separate business premises. Inside IR35, don’t assume you can claim or pass on these costs.
Planning tip: If you’re negotiating a rate, it’s reasonable to explain that your rate accounts for fixed overheads (including premises energy) and that contract renewals can change costs. Keep it factual and evidence-led.
FAQs
What does “inside IR35” change when pricing for energy overheads?
Inside IR35, you’re typically paid via PAYE (directly or through an umbrella), so you usually can’t rely on claiming business running costs in the same way as outside IR35. If you maintain your own premises, the safer approach is to include an energy allowance within your day rate rather than treating it as a recoverable expense.
How do I estimate a daily energy allowance without knowing future unit rates?
Use your last 12 months of bills (electricity and gas combined), divide by your realistic chargeable days, then add a buffer (often 10–20%). This avoids guessing unit rates while still reflecting your actual baseline cost, standing charges, and your site’s usage pattern.
When should I start comparing business energy quotes before renewal?
Start early enough to avoid rolling onto deemed or out-of-contract rates. Renewal windows and notice periods vary by contract, so check your current terms and diarise key dates. If you’re unsure, gathering quotes in advance gives you time to validate meter details and avoid rushed decisions.
Do business energy prices differ by UK region and meter type?
Yes. Quotes can vary by distribution region, meter profile (single-rate, multi-rate, half-hourly), consumption levels, and payment method. That’s why postcode and meter details matter when comparing suppliers for a specific premises.
Can I just pass my energy bill on to the client if I’m inside IR35?
Usually not as a simple “bill-back” arrangement, and many clients/agencies will not reimburse ongoing overheads. Some contracts may reimburse specific expenses under a policy, but you should treat that as the exception and confirm in writing. For most contractors, building an allowance into the rate is more reliable than hoping for reimbursement.
What information do I need to get accurate business energy quotes?
At minimum: business postcode and contact details. For best accuracy: latest bill, MPAN (electricity) and/or MPRN (gas), contract end date, meter type (smart/multi-rate/half-hourly), and an idea of annual consumption. If you have multiple meters or sites, mention that upfront.
Does the Ofgem price cap apply to business energy contracts?
The Ofgem price cap is primarily a domestic (household) protection and does not generally apply to business energy contracts in the same way. Businesses typically agree contract terms with suppliers, so comparing quotes and understanding contract conditions is especially important.
If I work from home inside IR35, should I include energy costs in my rate?
Possibly, but treat it differently from a separate business premises. If you’re inside IR35 and working from home by default, you may still face higher household energy usage. Whether you include it in your rate depends on your negotiation position and the role’s expectations (remote vs on-site). Don’t assume you can claim it back as an expense.
Trust, methodology and sources
Page details
- Written by
- EnergyPlus Editorial Team
- Reviewed by
- Energy Specialist
- Last updated
- July 2026
How we assess this (and limitations)
This guide focuses on rate-setting logic rather than publishing live unit rates. We use an overhead-allocation approach (annual cost ÷ chargeable days) because it is transparent, easy to evidence from bills, and robust against day-to-day market movement.
- Assumptions used in examples: single premises, stable operations, and a realistic chargeable-days estimate (not “every weekday”).
- What we don’t do: we do not invent supplier tariffs, unit rates, standing charges, or exit fees, because these vary by site, meter and time.
- What can change outcomes: multi-rate/half-hourly metering, major equipment changes, longer opening hours, relocating premises, and renewing onto different contract terms.
- Best next step: request quotes for your postcode and meter details so your allowance reflects real options available to your business.
Sources (UK)
- GOV.UK: Understanding off-payroll working (IR35)
- Ofgem: Energy regulator information and guidance
- Citizens Advice: Energy advice and consumer rights
Editorial note: EnergyPlus is a whole-of-market comparison service for business energy. Quotes depend on supplier criteria and the details you provide. We aim to present clear, practical guidance and highlight where terms vary.
Want a firmer number for your inside-IR35 rate?
Get business energy quotes for your premises so you can base your daily allowance on real contract options (not guesses). It’s the quickest way to tighten up your pricing for longer inside-IR35 engagements.
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