An online search engine has been launched to enable the public to inspect their local financial spending.
Under local government secretary Eric Pickles' transparency drive, every council is required to make all its expenditure above £500 available to the public for 20 days a year.
The online search engine has been published, setting out the open-day period for more than 280 councils. Ministers are calling for all councils to use the tool.
"For the next few weeks, town hall ledgers across the country are open to the scrutiny of armchair auditors. Every concerned citizen should use this opportunity to dig into the intricacies of their council's coffers," said Pickles.
Nottingham City Council is the last council refusing to publish its spending over £500 online.
"It is disappointing that one local authority is still failing to publish its spending online. I urge the press and public to exercise their legal rights to inspect Nottingham's books on the day it makes its accounts available," said Pickles.