Free Consultant Invoice Generator

A consultant's invoice should reference the master services agreement or statement of work so the client's accounts payable team can match the bill to contracted scope. Log time in fifteen- or thirty-minute increments with a brief task description, never as a bare consulting line with a lump of hours. Pass expenses through at cost with receipts attached, or disclose a stated markup of ten to fifteen percent; hidden markups are the fastest way to lose a long-term client. Separate retainer work from overage so the client sees what was covered by the monthly fee versus billed on top. Include a line for any out-of-pocket items like software licenses, printing, or third-party reports purchased on the client's behalf. The most common mistakes are invoicing consulting services as a lump sum with no time detail, which enterprise AP departments reject; failing to reconcile hours against the retainer so the client cannot tell if they are over or under; marking up expenses without disclosing it; and sending invoices weeks after the work, by which point the budget owner has moved on. One practical tip: invoice on a fixed cadence.