Consulting invoices get read by accounts payable departments, so structure wins: engagement reference, period covered, rates broken out, expenses at cost. This template arrives set up that way.
Whichever your engagement letter states — and show the math either way: days at the day rate, or hours at the hourly rate. AP teams approve arithmetic they can check at a glance.
Put it where it can't be missed — this template's notes field works well ("PO 4471"). At larger companies an invoice without the PO number often can't be processed at all, however correct it is.
As separate line items at cost, with a note that receipts are available. Agree on what's billable before the engagement starts; surprise expense lines are how Net 30 becomes Net 60.
Most AP departments batch payments on a monthly cycle, so Net 30 is their default rhythm. You can ask for Net 14 — smaller companies often agree — but for enterprise clients it's usually faster to submit early than to fight the cycle.