Overview
- Industry estimates indicate more than 54,500 solar households risk an automatic £100 penalty if they miss the online filing deadline on 31 January.
- Around 605,966 owners may need to submit Self Assessment returns because SEG earnings combined with other side income can exceed the £1,000 allowance.
- HMRC’s £100 late-filing fine applies even if no tax is ultimately owed, and official figures show about 9% of taxpayers miss the deadline each year.
- Typical SEG payments are reported at roughly £300 or more annually, and the relevant income window cited is April 2024 to April 2025.
- Advisers urge households to check supplier statements for export earnings and register or file if total supplementary income is above the threshold.