Layout signals competence
A professional invoice has a clear visual hierarchy: company identity at the top, totals on the right, line items in a clean table in the middle, payment instructions and terms at the bottom. The eye should move down the page in one direction, not jump around looking for the total.
If you have to scroll to find the amount due, the layout is wrong.
Use one font, two sizes, three weights
Invoices that mix three or four fonts look amateur even when the content is correct. Pick one readable typeface (your brand font is fine; if you do not have one, a system sans-serif works), use two sizes (one for body text, one for headings), and use bold weight only where it adds meaning — totals, headings, and the due date.
Show the totals clearly
The amount due should be the most visually prominent thing on the page after your company name. Right-align it. Use a slightly larger size or a heavier weight. Never bury the total in a paragraph or a footer.
Show subtotal, tax, and total separately even when they are simple. It signals you have done the calculation properly.
Pay attention to the line items
The line item table is where most invoices fall apart visually. Common mistakes: inconsistent decimal places, currency symbols missing on some lines, descriptions that wrap to four lines because they are too long.
- Use two decimal places everywhere, even for round numbers (4,500.00, not 4500).
- Show the currency symbol on the totals row, not on every line — repetition is noise.
- Keep descriptions to one or two lines. Move detail into a separate notes section if needed.
- Right-align numbers. Left-align text. Mixing the two is the most common visual flaw.
Small details that mark the difference
A few small details consistently separate professional invoices from amateur ones: a real logo (not a stretched JPEG), consistent spacing around the page edges, a unique sequential invoice number, and a footer with your registration details. None of these are hard. Skipping them is what marks an invoice as 'thrown together'.