Answer: Around £27,000 per annum
Rough estimate - including Student Loans Company (slc):
Assuming a nice round 60% net (tax + NI is approx 40%), we see...
£300 x 52 gives £15,600
Divide by .6 to gross up that figure gives you the higher gross of £26,000
£15,600 / 0.6 = £26,000
£90 * 12 = £1,080 (annual slc repayment on £26,000)
But 40% for tax & NI is wrong? But £90 per month slc is wrong?
These figures are a bit rough and ready. Feel free to substitute your own percentages.
A spreadsheet to help with the monthly repayment to slc can be found here
Note: Spreadsheet is in Open Document format (.ods).
You can view it directly in Googledocs here
Below is a preview image:
The Tax and National Insurance rate estimates are local to the United Kingdom, please adjust as appropriate for your local situation.
UK Zero Percent Tax threshold in 2014:From April 2014 the personal tax threshold (level below which no income tax is payable) is estimated at £10,000
What this means for somebody earning £27,000 is that 17,000 of their salary is taxed at entry level tax rate of 20%.
Making Annual income tax liability of £3,400 (Monthly £283.33)
The earlier statement "tax + NI is approx 40%" overstates things a little. Being an employee on that sort of salary means paying 12% National Insurance (NI).
Update the spreadsheet to reflect the current picture and get a more accurate estimate.
The £90 monthly payment to your Student Loan is still payable, and is not affected by changes in Tax or NI rates.