What goes into a mortgage payment
Lenders talk about PITI: principal, interest, taxes and insurance. The principal and interest part stays fixed on a fixed-rate loan. Property tax and insurance usually go into an escrow account and change from year to year. If you put down less than 20% on a conventional loan, private mortgage insurance (PMI) is added until you owe about 78% of the original price.
Why extra payments help so much
Early on, most of each payment is interest. Every extra dollar of principal cuts the balance that future interest is charged on. On a $280,000 loan at 6.5%, an extra $200 a month saves roughly $100,000 in interest and ends the loan about seven years early. Try it above.
Property tax rates vary a lot by county, from about 0.3% of value in Hawaii to over 2% in parts of New Jersey and Illinois. Check your county assessor's rate.