How can self-employed trading losses be used to reduce UK income tax?

Full answer

Trading losses arise when a self-employed person's allowable business expenses exceed their trading income. Several statutory provisions allow the loss to be relieved against other income, potentially generating a tax refund. Section 64 -- sideways loss relief The most commonly used option. The loss can be set against: -- Other income in the same tax year (e.g., employment income, rental income, savings income) -- Other income in the prior tax year (the "carry back" within S64) Annual cap: the higher of GBP 50,000 or 25% of the individual's "adjusted total income" (broadly, gross income before losses). This cap prevents very high earners from sheltering unlimited income with losses. Section 83 -- carry forward Unused losses can be carried forward indefinitely against profits from the same trade. There is no cap on carry-forward relief. Example: GBP 30,000 loss in 2025/26, carried forward against trading profits of GBP 10,000 in 2026/27 (GBP 20,000 remaining to carry forward). Opening years loss relief (Sections 72-74) For the first 4 tax years of a new business: -- A trading loss in any of those years can be carried back against total income for up to 3 preceding years -- The loss is set against the earliest year first -- This can generate significant income tax refunds for someone who had employment income before starting a business Terminal loss relief (Section 89) When a business ceases: -- The loss in the final 12 months of trading can be carried back against profits from the same trade in the previous 3 tax years -- Set against the most recent year first Class 4 NI and losses Trading losses reduce Class 4 NI as well as income tax. A loss carried forward against future trading profits reduces both the income tax and Class 4 NI on those future profits. Losses and the high income child benefit charge Sideways loss relief reduces "adjusted net income" which can bring someone below the GBP 60,000 HICBC threshold -- a secondary planning benefit for parents with children and Child Benefit. Farming losses Farming is subject to the "5-year rule" (S67 ITA 2007): if a farmer claims S64 relief for 5 consecutive years, HMRC may deny the relief on the basis the activity is not commercial. Specialist advice is required.

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