The 0% VAT Window: Why March 2027 is Your Hard Deadline

Understanding HMRC Notice 708/6

HMRC Notice 708/6 provides a 0% VAT rate on Energy-Saving Materials (ESMs) including solar panels, heat pumps, and battery storage—but this relief expires on 31 March 2027.

For a typical self-build project with a comprehensive renewable energy system, the VAT savings can exceed £15,000. Missing this deadline means paying full 20% VAT with no mechanism for reclaim.

The 'Supply and Fit' Requirement

Here's the critical detail most self-builders miss: To qualify for 0% VAT, you must use a 'Supply and Fit' contract.

This means:

• ✓ Eligible: Hiring an MCS-certified installer who supplies AND installs the equipment
• ✗ Not Eligible: Buying panels yourself and hiring labor separately
• ✗ Not Eligible: DIY installation with purchased materials

HMRC's logic: The zero-rate applies to the service of installation, not the materials themselves. If you buy panels retail, you pay 20% VAT upfront with no route for reclaim.

What Qualifies as an Energy-Saving Material?

Under Notice 708/6, the following qualify for 0% VAT until 31 March 2027:

• Solar PV panels and inverters
• Battery storage systems (subject to capacity limits)
• Air-source and ground-source heat pumps
• Heat pump cylinders and associated pipework
• Mechanical ventilation with heat recovery (MVHR) units

Critically, this does NOT include:

• Standard building materials (even if energy-efficient)
• Triple-glazed windows (unless part of a heat pump installation)
• Insulation materials

Your Action Plan

1. Confirm your contractor is MCS-certified (mandatory for 0% VAT)
2. Ensure your contract explicitly states 'Supply and Fit'
3. Obtain a written VAT declaration from your installer before work begins
4. Complete all ESM installations before 31 March 2027
5. Keep detailed invoices showing 0% VAT rate applied

Don't leave £15,000+ on the table. This window closes in March 2027 and won't be extended.