Capital Allowances and Annual Investment Allowance

TL;DR

• What capital allowances do
• When to claim AIA vs writing down

What qualifies as capital

• Equipment, computers, furniture
• Non-qualifying items

AIA

• Limits and timing
• Partial year purchases

Writing Down Allowance

• Pools and rates
• Example calculation

Cars and special rules

• CO₂ thresholds
• Mileage vs capital claim interaction

Records and evidence

• Invoices, dates, split business use