New Jersey requires every municipality to offer a grace period of at least 10 calendar days, which means most towns won't charge interest until Aug. 11. Some towns, like Haddonfield, extend the grace period further if tax bills went out late, so it's worth a quick call to your local tax office if you're unsure. Your payment has to physically be received before the grace period closes, so if you're mailing it, don't cut it close. New Jersey knows that too, which is why the grace period exists in the first place. Share of your tax bill going to schools vs. municipality How your property tax bill is split up depends on where you live.