What Is a Deemed Supply Invoice
A deemed supply invoice is UK business paperwork raised while energy still flows through your MPAN or MPRN but normal contract pricing is missing, delayed, or stuck in industry messaging. It is not permission to ignore the bill. This guide explains what suppliers are doing, how deemed paperwork differs from an ordinary in-contract invoice, and how to challenge genuine errors while you secure proper terms.
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Key takeaways
- Deemed supply invoices usually signal “energy is flowing while contract status is messy”; VAT, Climate Change Levy where applicable, and DNO pass-throughs can still appear as separate lines.
- Unit rates on these documents are often punishing—electricity might show very roughly 25p–45p/kWh or more in stressed periods—so treat the letter as an urgent procurement flag.
- Start every review with the MPAN or MPRN; wrong identity creates parallel disputes that tariff tweaks cannot fix—see MPAN and MPRN numbers explained.
- Licensed suppliers must bill fairly and run complaints properly; keep PDFs, portal exports, and dated call notes.
- Link the wording to what a deemed rate is so you separate tariff jargon from metering mistakes.
The lights are on but the lease ink is still wet
Electricity still moves across the DNO network to your meter point. Gas still registers against your MPRN. Somebody must account for those kilowatt-hours. When a formal business contract is not yet in force—or a switch has stalled—industry processes may place the site on deemed arrangements. The invoice that follows is legitimate even when the price feels unfair. Your job is to stabilise contract status fast while checking that reads, registers, and MPAN details are correct.
British Gas Business, E.ON Next, SSE Business Energy, and ScottishPower Business (examples only) print similar skeleton layouts because market data standards drive the fields. Focus on whether reads are actual or estimated before you debate brand behaviour.
Common sparks that create deemed paperwork
New occupiers often see deemed invoices while Letters of Authority and credit checks crawl through inboxes. Expired contracts and missed renewals park sites on out-of-contract rates that feel identical in practice. Objections during a switch, rejected start dates, or corrupted industry messages can leave consumption uncoupled from the tariff you thought you had. Parallel bills from two retailers are a red flag—treat them as same-week finance work.
Half-hourly MPANs add another layer: settlement-grade data may exist while commercial terms wobble. Your PDF might compress weeks of half-hourly volume into one kWh block plus standing charge and policy lines.
Comparison table: deemed supply invoice vs in-contract bill
| Signal | Deemed supply invoice | Normal contract bill |
|---|---|---|
| Tariff narrative | Highlights missing or lapsed commercial terms; may reference default tables. | Tracks the schedule you signed until renewal or amendment. |
| Budgeting | Harder to forecast; spikes show why you need a dated switch plan. | Easier accruals if reads stay accurate. |
| HMRC records | Still a business expense document if it meets invoice basics; file with VAT evidence. | Same discipline—map to GL codes your accountant sets. |
| Next action | Secure a written contract or complete the switch; dispute genuine errors quickly. | Monitor drift from contract and plan renewals early. |
How to read the PDF without drowning
Work top to bottom in this order: MPAN or MPRN, meter serial, billing period, opening and closing reads, whether the close is estimated, kWh, unit rate in p/kWh, standing charge p/day, CCL lines if split, VAT rate, and any DUoS or DNO-related labels billed through the supplier. If a pass-through line moved, ask for a plain-English map to the charging statement you expected.
Ofgem expects clarity from licensed suppliers. If you cannot reconcile the PDF to your own half-hourly extract or manual photograph, request a written breakdown. Escalate through the published complaints route if answers stall.
Checklist before you call the supplier
- Highlight the exact lines you accept versus the lines you dispute.
- Gather occupation evidence if the trigger was a new site or tenancy change.
- Collect switch emails with proposed start dates and any objections.
- Ask finance for the last valid VAT invoice to preserve an audit chain.
- Read how to switch business energy supplier so your exit from deemed rates does not stumble on industry timing.
Related guides
Dig into What is a deemed rate and rollover contracts, or browse the full energy guide library.
What do you want to do next?
Browse more independent guides on the SwitcherMate Business energy hub. If you would rather speak with us about procurement or a complex site, use the contact page. For fast online comparison under typical small-use thresholds, you can also use our business quote tool where it fits your situation.