The best time to do this is around nov and dec. Before the end of the fiscal year. Make an appointment with your tax assessor. Take with you your comps.
Speak with them one on one. Do not get argumentative. Just state the facts and the difference of the values and what you think the value needs to be.
What Andrew and Gina said is true. More specifically...
There are 33 non usable deed transactions you cannot use to compare to your home. http://www.state.nj.us/treasury/taxation/pdf/lpt/guidlines33.pdf
If at this time you cannot come to terms with your tax assessor then you will need to appeal your situation with the county. Your assessor will give you that information. You can use an attorney, but they will hire an appraiser which will cost approx $400. plus attorney fees. However if you are not comfortable going before a board of approx 7 people against you (1) then an attorney may be your best bet.
Good luck. Use a local real estate pro to give you your values. MAke sure they only use those deed transactions allowed by law to compare to your home.
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you can not fight the taxes but you can fight the assesment value of your home.
Check with your town on the process for your town.
You will probably need the help of a Realtor to show comparable homes sales for your home. The town will give you the criteria that the want. usually no short sale or bank sale comps and sales between a certain date.