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If you had a salary of £40,000 per year you will need to work out what you will need to earn to achieve the same or higher take home:
As a contractor you will only get paid for those weeks you actually work whereas as a permie you get paid for 52 weeks per year regardless - opinions vary but I would have thought that 46 working weeks per year would be about right.
If you are going to work with an umbrella company (or if you work through a Ltd but are inside IR35) your salary will be the contract rate (as agreed in the B2B contract between the brolly and the agency) less the amount that the umbrella company is obliged to pay for employer's national insurance, which is 13.8%, less the umbrella company's margin. You will be paid through PAYE so your salary will be subject to income tax and employee's national insurance contributions.
If it is your intention to work on more than one assignment whilst in the employment of the umbrella company you will be able to claim travel and subsistence expenses provided that the umbrella company is operating an over-arching contract of employment. With regard to other expenses - you can claim tax relief on costs which are incurred wholly and exclusively as a result of the contract - it's a complicated subject with many hundreds of pages of guidance from HMRC but a good umbrella company should have expert advisers who will be able to answer any questions that you have.
As Socialworker says - the take home you receive from any umbrella company should be no different from any other - the only differences will be in the margin that the umbrella company retains (usually £25-£30 per week) and the service that you receive.
HTH
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