Your monthly mortgage statement is rarely just principal and interest. Most lenders collect additional funds each month and hold them in an escrow account, then pay your property taxes and homeowners insurance on your behalf when those bills come due. Understanding how escrow works explains why your monthly payment can be noticeably higher than the raw principal and interest figure — and why it can change from year to year even if your rate never does.
What escrow actually is
An escrow account is a holding account managed by your loan servicer. Instead of you paying your property tax bill and insurance premium yourself once or twice a year, the servicer collects a portion of those annual costs with every monthly mortgage payment, then pays the tax authority and insurance company directly when each bill is due. This protects the lender from the risk of unpaid taxes creating a lien that outranks the mortgage, and it protects the homeowner from missing a large lump-sum bill and facing a lien or lapsed coverage.
How the monthly contribution is calculated
Your servicer takes the annual cost of each escrowed item — property taxes, homeowners insurance, and, if applicable, mortgage insurance or HOA dues collected through escrow — and divides it by 12 to determine the monthly contribution. Many servicers also maintain a small cushion, sometimes required or capped under federal servicing rules, to absorb bills that come in higher than estimated without immediately triggering a shortage.
Property tax estimates
Property taxes are set by local taxing authorities and vary enormously by location — county, city, and school district rates all stack together, and some areas reassess property values annually while others reassess only on sale. When modeling a purchase in a new area, use the actual current tax bill for the specific property if you can find it (often available through the county assessor's public records), rather than a citywide average, since taxes can vary block to block.
Homeowners insurance premiums
Insurance premiums depend on the home's value, location, construction, and coverage level, along with region-specific risk factors like flood or wildfire exposure that may require separate policies. Lenders require coverage sufficient to rebuild the home, which is not always the same as its market value. Get an actual quote for the specific property before finalizing your budget — enter it as an annual figure in the calculator and it will be converted to a monthly escrow estimate automatically.
HOA fees
Homeowners association dues are sometimes collected through escrow and sometimes billed directly to the homeowner by the HOA, depending on the lender and the property. Either way, HOA fees should be included in your total monthly housing cost calculation even if they never touch your mortgage servicer, since they are a mandatory recurring cost tied to owning the property.
Why escrow payments change over time
Property tax assessments and insurance premiums are not fixed for the life of the loan — taxes are typically reassessed periodically and insurance renews annually, often at a higher premium. Once a year, most servicers perform an escrow analysis: they compare what was actually collected and paid out against what should have been collected given updated tax and insurance costs. If there is a shortage, your monthly payment increases to cover the difference (and sometimes to repay a shortfall); if there is a surplus beyond the allowed cushion, you may receive a refund or a payment reduction. This is the most common reason a fixed-rate mortgage payment still changes year to year.
Escrow waivers
Some borrowers, particularly those with a large down payment or strong financials, can negotiate to waive escrow and pay taxes and insurance directly instead. This requires discipline to set aside the funds yourself and pay large bills on time, but it avoids servicer cushion requirements and gives you control over when the funds are held. Not all loan types allow a waiver — government-backed loans like FHA and VA loans generally require escrow regardless of down payment.
Modeling escrow accurately
When comparing homes or loan scenarios, always include realistic property tax and insurance estimates rather than leaving them blank, since these can meaningfully change what a property actually costs you each month. See our comparing loan scenarios guide for how to build a full picture that includes escrow alongside principal and interest.