Why would my mortgage payment increase due to a change in my escrow account?

It is important to note that, even with a fixed interest rate, monthly mortgage payments may change over the life of the loan due to changes in property taxes and insurance premiums. For instance, if a hazard insurance premium increases by $120.00 per year, the escrow payment will need to increase by $10.00 per month to account for this difference (in addition to collection for the resulting escrow shortage when the mortgage company paid $120.00 more for the hazard insurance premium than what was anticipated). By RESPA guidelines the escrow payment must be recomputed at least once every 12 months to account for increases in property taxes or insurance. This is called an escrow analysis.