
Discounts and partial billing periods: When applying discounts to invoices with prorated charges, percentage and fixed discounts behave differently.Example: For a £500 monthly charge prorated to 15 days (£500 * 15/30 = £250):
- A 10% discount applies to the prorated amount: £250 * 10% = £25 off
- A £100 fixed discount applies in full: £100 off (regardless of proration)