Self Assessment Online Filing

Use this skill whenever asked about UK income tax for individuals filing SA100 Self Assessment. Trigger on phrases like "income tax UK", "SA100", "personal allowance", "tax bands", "tax computation", "marriage allowance", "savings allowance", "dividend allowance", "Scottish tax rates", "payments on account", "tax reducers", "tax relief", "April 2026", "2026-27", "Autumn Budget 2025", "income tax bands frozen 2027-28", or any question about computing a UK individual's income tax liability. Covers personal allowance (including taper), income tax bands for rUK and Scotland, marriage allowance, savings and dividend allowances, tax reducers, the final tax computation, payments on account, and the Autumn Budget 2025 changes from April 2026. ALWAYS read this skill before touching any UK income tax return work.

Use this skill whenever asked about UK National Insurance Contributions (NIC) for self-employed individuals or employers. Trigger on phrases like "how much NIC do I pay", "Class 2 contributions", "Class 4 NIC", "Class 1 employer NIC", "Employer NIC 15%", "Secondary Threshold £5,000", "Employment Allowance £10,500", "April 2026 NIC", "Class 2 abolished", "national insurance self-employed", "NIC calculation", "state pension qualifying years", "NIC deferment", "voluntary Class 2", "HMRC NIC payment", or any question about UK NIC obligations. Also trigger when classifying bank statement transactions showing HMRC NIC debits, Self Assessment NIC payments, or Class 2 direct debits. This skill covers Class 1 (employee and employer), Class 2 (voluntary post-April 2024), Class 4 (profit-based), thresholds, payment schedule, bank statement pattern classification, Employment Allowance, interaction with employment Class 1, deferment, state pension entitlement, and edge cases across three tax years (2024-25, 2025-26, 2026-27). ALWAYS read this skill before touching any UK NIC-related work.

Use this skill whenever asked about UK Payments on Account (POA) for Self Assessment taxpayers. Trigger on phrases like "payments on account", "POA", "POA 2026", "January payment", "July payment", "balancing payment", "SA303", "claim to reduce", "reduce payments on account", "do I need to make payments on account", "POA threshold", "tax underpayment", "MTD ITSA payments on account", or any question about advance income tax payments under UK Self Assessment. Covers the two-payment schedule (31 January / 31 July), the GBP 1,000 threshold, the 80% PAYE test, balancing payment mechanics, SA303 claim to reduce, excluded items (Class 2 NIC, student loan, CGT), interest on late payments, the interaction with MTD ITSA quarterly updates from 6 April 2026, and interaction with tax codes. ALWAYS read this skill before touching any UK POA work.

Use this skill whenever asked about UK self-employment income for sole traders filing SA103S (short) or SA103F (full) as part of Self Assessment. Trigger on phrases like "self-employment income", "SA103", "trading income", "sole trader tax", "allowable expenses UK", "capital allowances UK", "trading allowance", "basis period", "tax year basis", "simplified expenses", "Class 4 NIC", "Class 2 abolished", "MTD ITSA", "Making Tax Digital", "April 2026 sole trader", "loss relief self-employed", or any question about computing self-employment profits for a UK sole trader. Covers trading income computation, allowable expenses, capital allowances (AIA, WDA, FYA), simplified expenses, the trading allowance, the completed basis period reform, the MTD ITSA three-phase rollout from April 2026, loss relief, and Class 4 NIC interaction (including the post-2024 rate cut and Class 2 abolition). ALWAYS read this skill before touching any UK self-employment work.