I am assuming the re assessment happened last year... and now you have received your tax bill or escrows and you noticed the increase.
If you have just been re assessed you will have an opportunity to to appeal their decision now. Set up an appointment with the assessing company or assessor. If the assessment was last year then your appeal process is now. Do not wait.
The assessment figure is based upon the market value of your home. Each town uses that number differently with an adjustment or without an adjustment. It really depends how they are figuring their tax base. I can;t tell you Willingboro's but you can call the tax assessor ask the rate and what the multiplier is if there is one. If the assessment is based upon 100 % market value then the assessment is their determination what the market value is.
April 30 is the last day to file your appeal.
Get 3-4 comps sold comparables... also get together some actives do not use foreclosures unless foreclosures represent 50% of your areas sales. Do use family transactions use fair value transactions. There is a list of non usable deed transactions on the state's tax revenue site.
Talk with assessor without any flaring emotions. They are doing their job and you will have to provide some proof why your home is valued less than what they are saying. After your talk if you get no where, which I suspect you won't, file your appeal. They will have a packet there for you. If you need comps call me... I have access to them for you.
If you have problems with the appeal process, because it can be confusing but it is not hard, you can purchase a program that helps you with the process every step of the way. You can go here http://goo.gl/aZ6wB
read a little and go to the site where the program is. There many out there but it is the best Ive seen. $39.00 Video Walk Through on how to proceed + Presentation Format + Forms + How To Step-By-Step + Lifetime Updates. It's been around a long time. I spoke with author a few times and I have used the same format for my appeals and have won all except one. That was because of the conspiracy they create when you go to the tax appeal itself. But I ended up winning in tax court with the very help of this program.
You also have other options, so while you are looking into appealing you can look to your alternative options.
Have any other questions or assistance