A real estate property tax bill can change but under certain conditions. However, if the government is willing to generate more revenue from the real estate taxes, they will increase the assessment value. Escalating the assessment value will naturally increase the value of your property while equally hiking the bills. Another thing that may alter the real estate tax bill is the property's value. Naturally, the real estate value increases over time. Perhaps this explains why tax assessors reassess the value every few years. How long tax assessors take to reassess the real estate value differs per country. However, the standard time period is somewhere between one to five years. Similarly, a real estate value may decrease due to a natural disaster. However, if the local government doesn’t want to lose their revenue, they might do the exact opposite: increase the assessment rate. Likewise, amendments in the government’s budget can also increase or decrease the real estate tax bill.