Write down your anticipated costs to complete the job. Include any phone calls or trips to the client’s office, shipping costs, total number of hours worked, zip drive you will give to the client, any post-job customer service, and your opportunity costs. Opportunity costs include work you could have done instead of the work for this client. For example, you might be giving up 10 hours of $25 per hour work to do this job, so price your bid and your time so you don't end up losing money on the deal.