Key terms in this article
What is Making Tax Digital?
Making Tax Digital (MTD) is HMRC’s rule that VAT-registered businesses must keep digital VAT records and submit returns through compatible software. It applies to nearly all UK telecoms resellers above the VAT threshold.
What is Ofcom?
Ofcom is the UK’s communications regulator. For telecoms resellers, Ofcom sets rules on billing accuracy, contract notifications, and price transparency under its General Conditions.
What is the Metering and Billing Approval Scheme?
The Metering and Billing Approval Scheme (TMBS) is a formal Ofcom approval scheme covering how charges are measured and billed. It only applies above a relevant annual turnover threshold (currently £55m), so most small and medium UK resellers are out of scope.
What is GDPR?
GDPR (General Data Protection Regulation) is the UK and EU rule for handling personal data. In telecoms billing, that includes call detail records, contact details, and payment information, which must be stored securely and kept only for as long as needed.
What Do UK Telecoms Resellers Need to Know About Billing Compliance?
Billing compliance isn’t exciting. But getting it wrong can cost you customers, fines, and a lot of stress. As a UK telecoms reseller, your billing touches several regulatory areas at once: tax, data protection, consumer rights, and industry-specific rules from Ofcom.
This guide covers the key areas to be aware of. It’s written for small and medium resellers who want practical advice, not legal jargon. It’s a starting point, not legal advice. For anything specific to your business, talk to your solicitor or your trade body. If you’re not sure where you stand, this is a good place to begin.
Key Takeaways
- The ICO issued around £21.7m in fines across 15 actions in 2025, an eightfold rise on the £2.7m total of 2024 (URM Consulting, 2025)
- Making Tax Digital requires digital VAT record keeping and submission through compatible software
- Ofcom’s General Conditions expect accurate billing and clear billing information across the industry
- The Metering and Billing Approval Scheme (TMBS) only applies above a relevant annual turnover threshold (currently £55m)
- GDPR applies to call records and billing data, so you need clear retention rules
- End-of-contract notifications are required for fixed-term consumer and small business contracts
- A good billing platform supports many of these obligations as part of normal operation
What Does Making Tax Digital Mean for Telecoms Billing?
Making Tax Digital (MTD) is HMRC’s programme to move tax reporting online. If you’re VAT-registered, MTD already applies to you. Your VAT records must be digital, and you must submit your VAT return through MTD-compatible software. From 6 April 2026 a separate regime, MTD for Income Tax, begins for sole-trader and landlord customers above £50,000; see our Making Tax Digital April 2026 post for what that adds. Many of your reseller customers will be in scope, so it’s worth a quick check whether their identity verification under the new Companies House rules is also up to date.
What you need to do
- Keep digital records of all VAT transactions. Spreadsheets can count, but only if they link digitally to your submission software. Paper records don’t qualify.
- Submit your VAT return through MTD-compatible software. You can’t file manually through the HMRC website any more.
- Connect your billing to your accounts. If your billing platform feeds directly into accounting software like Xero or Sage, your VAT records are already digital. That’s one less thing to worry about.
Digital services VAT
If you sell a mix of voice, data, and cloud services, the VAT treatment may differ between them. Voice calls and data services are standard-rated. But if you bundle in software or cloud services, those may need separate treatment depending on where your customer is based.
From our experience: The most common VAT mistake we see from new customers is treating all services the same way on invoices. If you bundle different service types, check the VAT treatment for each one. Your accountant can advise, and your billing system should let you set different VAT rates per service.
Make sure your invoices clearly show the VAT amount, the VAT rate, and your VAT registration number. These are basic requirements, but it’s surprising how often they’re missed on manually created invoices.
What Does Ofcom Expect from Your Billing?
Ofcom regulates the UK telecoms industry. Two things matter for billing.
The first is the General Conditions of Entitlement, which apply broadly to providers of public electronic communications services. General Condition C3 covers billing accuracy and adequate billing information. Whatever your size, customers should be billed correctly and given enough information to understand what they’re paying for.
The second is the Metering and Billing Approval Scheme (TMBS). This is a more formal approval scheme that applies only where a provider’s relevant annual turnover exceeds a threshold (currently £55m). Most small and medium resellers fall well below that threshold and are not in scope for TMBS approval, although the underlying principle of accurate billing still applies.
If you’re not sure which obligations apply to your business, ask your trade body or check Ofcom’s current guidance. The notes below are practical things to have in place either way.
Practical things to have in place
- Demonstrable accuracy. Keep records of how every charge was calculated: the CDR data, the rate applied, and the resulting amount. If someone asks “why was I charged £4.20 for this call?”, you should be able to answer that with evidence.
- Dispute resolution. When a customer disputes a charge, follow a clear process. Investigate the complaint. Check the source data. Respond within a reasonable time.
- Audit trails. Keep records. Every CDR, every rate, every invoice should have a trail back to the source data.
How does this work in practice?
If you’re billing manually with spreadsheets, proving accuracy is hard. You’d need to keep every CDR file, every rate card, and every version of every invoice. That’s a lot of files to organise and store.
With automated recurring billing, the audit trail is built in. Every charge links back to the CDR record and the rate that was applied. If a customer queries a charge, you can pull up the evidence in seconds, not hours.
What Are the Price Transparency Rules?
Ofcom’s price transparency rules protect consumers from hidden charges and unexpected costs. These apply to you if you sell to consumers or small businesses.
All-inclusive pricing
Your marketing and contracts should show the full cost, including VAT where you’re selling to consumers. No hidden fees. No surprise add-ons that only appear on the first invoice.
End-of-contract notifications
If you sell services on fixed-term contracts, you must tell customers before their contract ends. The notification needs to include:
- What they’re paying now
- What they’ll pay when the contract ends (if the price changes)
- What their options are, including switching to a different deal or leaving
Your billing system should track contract end dates and send these notifications automatically. Doing it by hand for every customer is a recipe for missed deadlines.
Price increase communications
The rules on telecoms price rises changed on 17 January 2025. New and renewed consumer contracts must set out any in-contract price rises in pounds and pence at the point of sale. Inflation-linked or percentage-based price rise terms in the main monthly price are no longer allowed for new and renewed contracts.
What that means in practice:
- If you sell to consumers (and many small business customers), you can’t write a contract that says “your monthly price will rise by CPI plus 3.9% each year” any more.
- You need to tell customers, before they sign, exactly how much any in-contract increase will be in pounds and pence, and when it will happen.
- For changes outside those rules, customers still need proper notice and the right to leave without penalty if you’re materially worsening the deal.
Your billing system should help you track contract terms, scheduled price changes, and the notices you’ve sent. If you’re updating prices across hundreds of customers, doing it by hand is where this kind of thing goes wrong.
How Does GDPR Affect Telecoms Billing?
You handle personal data every day: names, addresses, phone numbers, call records, and payment details. GDPR applies to all of it. The Information Commissioner’s Office (ICO) enforces data protection rules in the UK, and telecoms is one of their areas of interest.
What counts as personal data in billing?
Call detail records are personal data. They show who called whom, when, and for how long. That’s information about identifiable people, and it needs to be treated with care.
Payment information, contact details, and usage data are all personal data too. If it relates to a person, GDPR applies.
What you need to do
- Set retention periods. Decide how long you keep billing data and stick to it. You need to keep records long enough to handle disputes and meet tax requirements, but not forever. Document your retention policy and make sure your systems enforce it.
- Handle access requests. Your customers have the right to ask what data you hold on them. You need to respond within one month. If your data is scattered across spreadsheets and email inboxes, that’s going to be difficult. A proper billing platform keeps everything in one place.
- Store data securely. Use appropriate security measures. Limit who can access customer data. Keep records of who accessed what and when.
The cost of getting this wrong has risen sharply. The Data (Use and Access) Act 2025 brought PECR penalties into line with UK GDPR, so fines for security failings in telecoms can now reach £17.5m or 4% of global turnover, whichever is greater (ICO guidance on DUAA commencement, 2026). Manual billing makes most of these obligations harder, which is one reason we cover the hidden costs of manual telecoms billing in detail elsewhere.
UK data hosting
Where your data is stored matters. If your billing platform hosts data in the UK, that simplifies your GDPR obligations. You don’t need to worry about international data transfer rules or adequacy decisions. Our platform hosts customer data in the UK. Where third-party processors are involved (for example payment providers), they’re listed in our data processing documentation.
Do Your Bills Need to Be Accessible?
Yes. The Equality Act requires you to make reasonable adjustments for customers with disabilities. For billing, that means:
- Clear formatting. Bills should be easy to read, with a clear layout and readable font sizes.
- Screen reader compatibility. If you provide bills electronically (PDF, HTML, or through a customer portal), they need to work with screen readers. That means proper document structure, not just a picture of a table.
- Alternative formats. If a customer asks for their bill in large print or another format, you should be able to provide it.
Your customer portal matters here too. If customers access their bills online, the portal needs to meet basic web accessibility standards. Good HTML structure, readable text, and keyboard navigation go a long way.
Key Compliance Areas at a Glance
| Area | What’s Required | How a Billing Platform Helps |
|---|---|---|
| Making Tax Digital | Digital VAT records, software submission | Connects to Xero/Sage, keeps digital records automatically |
| Ofcom billing accuracy | Demonstrable accuracy, audit trails, dispute resolution | Every charge links to source CDR data and rate applied |
| Price transparency | All-inclusive pricing, end-of-contract notices | Tracks contract dates, automates notifications |
| GDPR | Data retention, access rights, secure storage | Centralised data, configurable retention, UK hosting |
| Accessibility | Readable bills, screen reader support | Structured digital bills, accessible portal |
How Does a Billing Platform Help with Compliance?
The right billing platform handles most of these requirements without extra work on your part. That’s not a bonus feature. It’s one of the main reasons to move away from manual billing.
When your billing is automated:
- Your records are digital by default. Every CDR, every rate, every invoice is stored digitally with a full audit trail. That covers MTD, Ofcom accuracy requirements, and GDPR record keeping.
- Your invoices are consistent. The same template, the same VAT handling, the same formatting, every time. No one-off mistakes from a tired evening of invoice building.
- Your contract dates are tracked. The system knows when contracts end and can send notifications automatically.
- Your data is in one place. When a customer asks for their data or disputes a charge, you can find what you need quickly.
Compliance isn’t something you sort out once and forget. Rules change, and your systems need to keep up. But with the right platform underneath you, staying compliant is part of the normal billing process rather than an extra job. For a checklist of the platform features that support most of these obligations out of the box, see our guide to the essential features of a telecoms billing platform.
Frequently Asked Questions
What is telecoms billing compliance?
Telecoms billing compliance means meeting all the legal and regulatory rules that apply to how you bill your customers. For UK resellers, that includes HMRC tax rules, Ofcom billing accuracy standards, GDPR data protection, and consumer protection regulations like price transparency and end-of-contract notifications.
Do small telecoms resellers need to worry about Ofcom compliance?
Yes, but the obligations vary by size and activity. Ofcom’s General Conditions, including the rules on accurate billing and adequate billing information (C3), apply broadly to providers of public electronic communications services. The formal Metering and Billing Approval Scheme (TMBS) only applies above a relevant annual turnover threshold (currently £55m), so most small resellers are not in scope for TMBS approval. The principle of getting bills right still applies. If you’re unsure which specific obligations apply to your business, check Ofcom’s current guidance or ask your trade body.
How long should I keep telecoms billing records?
There’s no single answer, as it depends on the type of data and its purpose. VAT records must be kept for at least six years under HMRC rules. For billing disputes, Ofcom expects you to have records available for a reasonable period. Set a clear retention policy and document it. For more detail, see our frequently asked questions.
Does GDPR apply to call detail records?
Yes. CDRs contain personal data: they show who made a call, to which number, when, and for how long. Under GDPR, this information must be handled securely, stored only as long as necessary, and made available to customers on request. If your billing platform stores CDRs in the UK, that simplifies your data protection obligations.
Not sure where your billing stands on compliance? Get in touch and we’ll help you check your setup against the latest requirements.