Corporate Excel Invoice Template Design

I need a polished, professional-looking invoice template built directly in Excel. The sheet must already include my company logo in the header area and follow a clean corporate layout that prints neatly on A4.

Essential sections
• Invoice number and invoice date, ready for quick manual entry.
• Client details block (name, address, contact).
• An itemised table for products or services with columns for description, quantity, unit price and line total.
• A 20 % VAT line that can be switched on or off simply by selecting “Yes/No” from a dropdown.
• Grand-total fields that calculate automatically as each row is filled in, reflecting VAT when enabled.

Acceptance criteria
1. All calculations (line totals, subtotals, VAT and grand total) update instantly through clear, unlocked input cells and protected formula cells.
2. Colours, fonts and spacing stay consistent with a conservative corporate style; nothing flashy.
3. When the sheet is cleared of sample data it remains completely functional and ready for reuse.
4. The file opens without macro warnings (standard Excel formulas only).

Please deliver the finished .xlsx file along with brief instructions so anyone on my team can swap in future logo updates or tweak the VAT rate if regulations change.