Why Did My Mortgage Payment Go Up When My Interest Rate Is Fixed?

One of the most common calls I get from homeowners — especially in the spring — goes something like this: "My mortgage payment just went up, but I have a fixed-rate loan. How is that possible?"

It is a fair question, and the answer almost always comes down to one thing: your escrow account.

Understanding how escrow works, why it changes, and what you can do about it will save you from being caught off guard every time your servicer sends an annual escrow analysis.

What a Fixed-Rate Mortgage Actually Fixes

When you have a fixed-rate mortgage, your principal and interest payment is fixed for the life of the loan. That part does not change.

But most mortgage payments include more than principal and interest. They also include:

• Property taxes (collected monthly and paid to the county on your behalf)
• Homeowners insurance (collected monthly and paid to your insurer)
• Mortgage insurance (PMI or MIP, if applicable)

The portion of your payment that covers taxes and insurance is held in an escrow account — a separate account managed by your loan servicer. Every month, a portion of your payment goes into that account. When your tax bill or insurance premium comes due, your servicer pays it from the escrow balance.

The problem is that property taxes and insurance premiums change over time — and when they go up, your escrow payment has to go up with them.

What Is an Escrow Shortage?

Once a year, your servicer performs an escrow analysis — a review of your escrow account to determine whether the balance is sufficient to cover your upcoming tax and insurance obligations.

If your taxes or insurance increased since the last analysis, your escrow account may not have enough money to cover the new amounts. This is called an escrow shortage.

When a shortage is identified, your servicer has two options:

1. Spread the shortage over 12 months — your monthly payment increases by the shortage amount divided by 12, plus the higher ongoing escrow contribution going forward
2. Ask you to pay the shortage in a lump sum — some servicers offer this option, which eliminates the shortage immediately and results in a smaller monthly payment increase

Most homeowners see option one — a higher monthly payment — without fully understanding why.

Why Property Taxes Increase

In California, Proposition 13 limits annual property tax increases to 2% per year on the assessed value — as long as the property has not changed ownership or undergone significant new construction. This provides meaningful protection against large year-over-year tax jumps for long-term owners.

However, there are situations where California property taxes can increase more significantly:

Supplemental tax bills after purchase. When you buy a home, the county reassesses the property at the purchase price. If the purchase price is higher than the previous assessed value, you will receive a supplemental tax bill reflecting the difference. This is a one-time adjustment, but it can be substantial. For more on how this works, see our article on California supplemental property tax bills after buying a home.

Mello-Roos and special assessments. Some California communities have Mello-Roos Community Facilities Districts or other special tax districts that add to the base property tax. These can increase over time based on the terms of the district's financing.

New construction or additions. Adding square footage, an ADU, or a pool can trigger a partial reassessment of the improvement value, increasing your tax bill.

In Colorado, Ohio, and Texas, property tax reassessment cycles and rules differ — but the principle is the same: when the county reassesses your property at a higher value, your tax bill goes up, and your escrow payment follows.

Why Homeowners Insurance Increases

Homeowners insurance premiums have increased significantly across California and much of the country over the past several years. The reasons include:

• Increased wildfire risk and the withdrawal of major insurers from high-risk California markets
• Rising construction costs, which increase the cost to rebuild after a loss
• Inflation in labor and materials
• Reinsurance market pressures that push costs down to policyholders

If your insurer raised your premium at renewal, your escrow account needs to collect more each month to cover the higher bill. That shows up as a payment increase at your next escrow analysis.

In some California markets, homeowners who have lost their private insurance coverage have been placed in the California FAIR Plan — the state's insurer of last resort — which typically carries higher premiums than standard market coverage.

How to Read Your Escrow Analysis Statement

Your servicer is required to send you an annual escrow analysis statement. It will show:

• Your current escrow balance
• The projected tax and insurance payments for the coming year
• The required minimum balance (servicers are allowed to maintain a cushion of up to two months of escrow payments)
• The new monthly escrow payment
• Any shortage or surplus

If there is a surplus — meaning your escrow account has more than it needs — your servicer will typically send you a refund check or apply the surplus to reduce your payment.

If there is a shortage, the statement will explain how it will be collected.

What You Can Do

Review the analysis carefully. Make sure the tax and insurance amounts your servicer is using are accurate. Errors do occur — a servicer might use an estimated tax amount that is higher than your actual bill, or fail to update your insurance premium correctly.

Contact your county assessor if your tax bill seems wrong. If your property was reassessed at a value you believe is too high, you have the right to appeal. In California, the deadline to file an assessment appeal is typically September 15 or 60 days from the date of the notice, whichever is later.

Shop your homeowners insurance. If your premium increased significantly at renewal, it is worth getting competing quotes. Even in a difficult insurance market, rates vary between carriers.

Consider paying the shortage as a lump sum. If your servicer offers this option and you have the cash available, paying the shortage upfront results in a lower ongoing monthly payment increase than spreading it over 12 months.

Understand that this is normal. A payment increase due to an escrow shortage is not a sign that something is wrong with your loan. It is a routine adjustment reflecting real changes in your tax and insurance obligations. Your interest rate and your principal balance are unaffected.

The Bottom Line

A fixed-rate mortgage fixes your principal and interest payment — not your total monthly payment. When property taxes or homeowners insurance increase, your escrow contribution increases with them, and your total payment goes up.

The annual escrow analysis is the mechanism that keeps your escrow account funded. Understanding it means you will not be surprised when the adjustment notice arrives.

If you have questions about your mortgage payment, your escrow account, or your loan options in California or Colorado, reach out or schedule a call.

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NMLS Individual #1087365 · NMLS Company #1147207 · CA DRE #01265685. SMS Mortgage is a licensed mortgage broker in California and Colorado. Stephanie Pedley holds individual MLO authorizations in Texas through B Walters CO., LLC (NMLS #262157), Ohio through Beacon of Hope Residential LLC (NMLS #2543671), and Nevada through CASMIA HOLDING LLC (NMLS #1740673). Not a commitment to lend. All loans subject to credit approval.