One question I often hear from buyers after they purchase a home is:

“Can my property taxes increase after I buy the house?”

The short answer is yes — but usually in predictable ways.

California’s property tax system is governed largely by Proposition 13, which limits how much property taxes can increase each year. However, there are several situations where property taxes can change after a purchase.

Understanding these changes helps homeowners avoid surprises and plan their long-term housing costs.

If you're new to how property taxes work in Santa Clara County, start with this guide first:
👉 https://re38.com/blog/how-do-property-taxes-work-in-santa-clara-county

1️⃣ Property Taxes Usually Reset When You Buy a Home

The most common tax change happens right after the property changes ownership.

When a home sells in California:

• The assessed value typically resets to the new purchase price
• The county calculates property taxes based on that value
• The new tax bill reflects the updated assessment

For example:

• If a home previously assessed at $800,000 sells for $1,600,000
• The assessed value will typically reset to $1,600,000

The new homeowner then pays taxes based on that new value.

This is why buyers often notice a large difference between the previous owner’s tax bill and their own.

2️⃣ Property Taxes Can Increase Slightly Each Year

After a home is purchased, property taxes do not remain frozen forever.

Under Proposition 13, the assessed value can increase by up to 2% per year.

That means:

• Property taxes may rise gradually each year
• The increase is capped at about 2% annually

This rule helps provide predictability for homeowners and prevents dramatic spikes in tax bills.

3️⃣ Supplemental Property Tax Bills After a Purchase

Another change buyers often experience is a supplemental property tax bill.

This happens because the county needs to adjust the property taxes after the sale.

Here’s how it works:

• The previous owner was paying taxes based on their assessed value
• The home sells at a new price
• The county recalculates the property taxes
• The difference is billed as a supplemental tax

This bill is separate from the normal tax bill and often arrives several months after closing.

4️⃣ Property Taxes Can Increase After Major Renovations

Property taxes can also change if significant improvements are made to the property.

Examples include:

• Adding square footage
• Building an ADU
• Major structural renovations
• Adding a second story

When this happens, the county may reassess only the value of the improvements, not the entire home.

This is something homeowners should consider before starting large renovation projects.

5️⃣ Local Assessments and Bonds

In some cases, property taxes can increase because of local voter-approved assessments.

These may include:

• School district bonds
• Infrastructure improvements
• Community facilities districts (CFDs)
• Local service assessments

These additional charges are usually small compared to the base tax, but they are included in the overall property tax bill.

6️⃣ Property Taxes Can Sometimes Decrease

While increases are more common, property taxes can sometimes temporarily decrease.

If housing prices fall significantly, homeowners may qualify for a temporary reassessment reduction.

This is often referred to as a Prop 8 reduction.

However:

• When the market recovers
• The assessed value can increase again until it reaches the Prop 13 limit

Why Understanding Property Taxes Matters for Buyers

Property taxes are one of the most important costs buyers should factor into their housing budget.

Along with your mortgage payment, taxes affect your total monthly housing expense.

That’s why I always encourage buyers to understand the full financial picture before purchasing a home.

These guides can also help with planning:

👉 https://re38.com/blog/how-much-house-can-i-afford-in-san-jose
👉 https://re38.com/blog/how-do-debt-to-income-ratios-affect-loan-approval-in-san-jose-2026-guide

Understanding financing, taxes, and long-term costs together helps buyers make more confident decisions.

What I Tell Buyers About Property Taxes

When I work with buyers in San Jose and throughout Santa Clara County, I always make sure they understand a few key things about property taxes.

The most important points are:

• Property taxes usually reset when you buy
• Taxes may increase by about 2% per year under Prop 13
• Buyers often receive a supplemental tax bill after closing
• Major improvements can trigger reassessment

Once buyers understand these basics, property taxes become much easier to plan for.

Thinking About Buying a Home in San Jose?

If you're planning to buy a home and want help understanding property taxes, financing, or the buying process, I’m always happy to help.

Every property and situation is different, and getting clarity early can make the process much smoother.

📞 Zaid Hanna
408-515-1613
🌐 www.re38.com