The 5.5% you mentioned is basically the same in the whole country.

The business tax of catering industry: the turnover is all the income collected from providing catering services to customers, and it is calculated and paid at the tax rate of 5%. With the business tax, the urban maintenance and construction tax and education surcharge are levied, and the taxpayer's location in the urban area adds up to 1.5%

The 8% you mentioned is an approved comprehensive levy rate, and the taxes included in it include income tax (personal income tax or enterprise income tax), which varies slightly from region to region, depending on how the local tax authorities set it (usually stipulated in documents). You said that the rate in other parts of Jiangsu is 5.5%, which does not include income tax. It is definitely inaccurate.