Always negotiable; but, in general, I require a signed contract and a deposit of 25%-50% to begin work. In some cases, (very small valued projects & very fast turnarounds) I may require payment in full upfront. (Guru's Escrow service is fine). Large, long-term projects may require interim payments and payment in full is required before delivery of final files for new clients. Established clients may be billed "Net 30." All copyright transfers are conditional on receipt of full payment.