You should not charge clients extra for a rush, according to freelance writer Laura Spencer. Freelancers should only take a job if they can fit it into their schedule. Charging more for a rush job may make you feel like you should push scheduled work aside because of the extra pay of a rush job.
Up to 100 Percent
Depending on the type of project the client needs and when he needs it done, you can charge 50 percent on top of your normal rate, or "time and a half," according to freelance translator Corinne Mackay. If the client wants a priority job, then he should pay a priority fee.
Ultimately, it depends on your personal judgment whether or not you should charge a rush rate; if you do, it is reasonable to add at least a 50 percent mark-up of your normal fee. Dina Giolitto of Word Feeder recommends charging more than your normal rate if a client needs a rush job and it requires changing your schedule. You should consider, however, that a rush job may eat up time that could be spent looking for a higher-paying job. Rushing work could also result in substandard output.