Certainly, here is the segregation of the amounts on the invoice:

- **Professional FigJam seats (monthly):** 
  - Quantity: 0
  - Unit price: $5.00
  - Tax: $0.00
  - Amount: $0.00

- **Professional Figma design seats (monthly):**
  - Quantity: 3
  - Unit price: $15.00
  - Tax: 18%
  - Amount: $45.00

- **Subtotal:** $45.00
- **Total excluding tax:** $45.00
- **Tax (18% on $45.00):** $8.10
- **Total:** $53.10
- **Amount due:** $53.10 USD