This was up from the £5,314,296 recorded at the end of 2010/11.
A total of 14,383 residents were in arrears.
292 residents owed more than £3000, while 6 residents owed more than £10,000.
In 2011 the latter figure had been zero.
7535 liability orders were issued last year and bailiffs dealt with 3637 cases.
The Council wrote off over £370,000 in Council Tax debts last year.
More detailed figures can be read by clicking here