Lisa works from home two days a week as required by her employer. She claims the flat-rate working from home allowance — £6/week, no receipts needed. That's £312/year off her taxable income. As a higher-rate taxpayer, it saves her £124.80 in tax. She also pays £50/year for her BCS membership. Tax relief on that saves another £20.
Individually these are small. But Lisa backdates both claims 4 years and gets £580 in one go. And they recur every year automatically once set up. It takes 10 minutes via a P87 form.
→ Action: Submit a P87 form or claim via self-assessment. 10 minutes, backdatable 4 years.