The first question:
Do you mean: as a freelancer or as a full-time job?
They really are two different things. As a full-time job you will be paid a yearly salary and the number of documents you proofread may vary. As a freelancer you are largely sourcing the work for yourself and there will be times when you have no work at all.
Full-time proofreading job salaries
A quick search shows that a full-time, salaried proofreader can expect to make between £16,000 and £30,000 per year. A constantly updated overview of proofreading salaries can be found here: https://www.glassdoor.co.uk/Salaries/proofreader-salary-SRCH_KO0,11.htm
Note that this salary range is for jobs such as “content editor”, “proofreader” or “editor”. Other jobs such press officer or content executive can be jobs that require a large amount of proofreading.
It is also important to note that proofreading salaries in London are likely to pay more than those located outside the city.
I presume, for the sake of this article, that you want to work from home and are thus interested in how much you could stand to make as a freelancer.
Freelance proofreader salaries
What you earn as a freelance proofreader can vary. The factors that influence your earnings include:
- how fast you can proofread
- how much experience you have (as this will make you faster)
- whether you are a subject specialist or not (again this will allow you to proofread faster)
The Society of Freelance Editors and Proofreaders (SfeP) is the official body in the UK that endeavours to provide freelance proofreading salary guidelines.
As of March 2018 their recommended rates are:
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I must point out, that in my opinion the SfEP is very much focused on the publishing industry. Many argue that these rates are not realistic when it comes to academic or business proofreading.