Nov 28, 2026 · By Oanh Nguyen · Broker & Loan Officer · Home Loans
"How much house can I afford?" is usually the first question buyers ask. Online calculators give a quick answer based on income. But income alone doesn't tell you what you can comfortably afford, and in the Bay Area, the gap between "approved for" and "comfortable with" can be big.
Your real budget comes from your total monthly housing cost, your other debts, your down payment and cash and a real pre-approval from a lender.
In this post, I'll walk through each piece: principal and interest, property taxes, insurance, HOA dues, debts, cash reserves and pre-approval. I'm a broker and a licensed loan officer. This is general education, not a loan offer or rate quote. I don't show rates or payment examples here, because they change daily and depend on your situation.
Start With the Market
Here's what homes cost in the areas I serve, so you have a starting point.
| City | Median sale price (all home types) |
|---|---|
| Pleasanton | $1,496,787 |
| Fremont | $1,370,347 |
| San Jose | $1,349,357 |
| Milpitas | $1,287,887 |
| Castro Valley | $1,137,958 |
| San Leandro | $849,595 |
| Hayward | $830,604 |
Source: Redfin city housing market pages, data through September 2026, accessed October 26, 2026.
At the county level, C.A.R. reported single-family medians of $1,920,000 in Santa Clara County and $1,265,000 in Alameda County in September 2026.
A median is the middle sale for a whole city. Condos, townhomes and houses are mixed together. Your target home may cost more or less. My post on median home prices has more detail.
Your Total Monthly Housing Cost
Your monthly cost is more than the loan payment. It usually includes:
Principal and interest
The loan payment itself. It depends on the loan amount, interest rate and loan term. Your lender's Loan Estimate shows this number.
Property taxes
In California, property taxes are based largely on your purchase price under Proposition 13. Your bill will likely be very different from what the seller pays. Some areas also have special assessments, like Mello-Roos. And after you buy, you may get a supplemental tax bill.
My post on Prop 13 and Mello-Roos basics explains how this works. For estimates, use your county assessor's resources.
Homeowners insurance
Lenders require it. Premiums vary by home, location and coverage. Earthquake and flood coverage are usually separate. Get quotes early. In parts of California, insurance has become harder to find and more expensive in some areas.
HOA dues
Condos, townhomes and some single-family neighborhoods have HOA dues. These can be significant and can rise over time. Ask about planned increases and special assessments.
Mortgage insurance
Some loans require mortgage insurance, depending on the loan type and down payment. Your lender can tell you if it applies.
Total monthly housing cost = principal and interest + property taxes + insurance + HOA dues + mortgage insurance (if any).
That's the number to focus on, not just the loan payment.
Your Other Debts
Lenders look at your debt-to-income ratio (DTI): all your monthly debt payments divided by your gross monthly income. The CFPB explains it as one way lenders measure your ability to manage monthly payments.
Debts usually include:
- Car loans.
- Student loans.
- Credit card minimum payments.
- Personal loans.
- Child support or alimony.
- The new housing payment.
Different loan programs and lenders have different DTI limits. I'm not listing them here because they vary and change.
Your own comfort level matters too. A lender may approve a payment that would leave you stretched. Look at your full budget: childcare, commuting, savings goals, retirement, travel and emergencies.
Your Down Payment
Your down payment affects:
- Your loan amount and monthly payment.
- Whether you'll pay mortgage insurance.
- Which loan programs fit.
- How competitive your offer is.
Down payment requirements vary by loan program. Some programs allow smaller down payments, and some have assistance options for eligible buyers. I'll cover down payments in more detail in my next post.
Closing Costs and Cash to Close
Beyond the down payment, you'll need cash for closing costs, like lender fees, title, escrow and prepaid taxes and insurance. Your Loan Estimate shows your estimated cash to close.
Sometimes sellers agree to credits toward closing costs, depending on the market and the loan program.
Cash Reserves
Reserves are money you still have after closing. Some loan programs require them. Even if yours doesn't, keep a cushion.
Reserves help you handle:
- Moving costs.
- Furniture and setup.
- Repairs in the first year.
- A job change or emergency.
Don't spend every dollar to buy the house. A home with no cushion can feel stressful from day one.
Pre-Approval: Your Real Number
A pre-approval is a lender's review of your income, assets, debts and credit. It's the best way to know what you can borrow.
Pre-approval vs. online calculators:
- Calculators use estimates. Pre-approval uses your real documents.
- Calculators don't know your credit. Pre-approval does.
- Sellers take pre-approval letters seriously. Calculators don't count.
What you'll usually need:
- Pay stubs, W-2s or tax returns.
- Bank and investment statements.
- ID.
- Permission to check credit.
- Information on debts.
If you're self-employed or have non-traditional income, there may be other documentation paths. Ask your loan officer.
Approved vs. Comfortable
Your pre-approval tells you the maximum a lender may lend. Your comfortable budget may be lower.
To find your comfortable number:
- Write down your current monthly spending.
- Add your expected total monthly housing cost.
- Add savings goals and an emergency fund contribution.
- See what's left.
If the number feels tight, consider a lower price range, a different home type or a different area. It's better to buy a home you can enjoy than one that keeps you up at night.
Ways to Stretch Your Budget Without Overstretching
If your target area feels out of reach, there are practical options:
- Look at a different home type. A townhome or condo may fit where a single-family home doesn't. Check HOA dues and rules.
- Expand your search area. Nearby cities or ZIP codes may offer more for your budget. I serve San Jose, Milpitas, Fremont, Hayward, Castro Valley, San Leandro and Pleasanton.
- Consider a home that needs cosmetic work. Paint and flooring are easier to change than location.
- Ask about down payment assistance programs you may qualify for.
- Pay down other debts before you apply, if it improves your picture.
- Buy with a co-borrower, with a clear written agreement.
What I don't recommend: stretching to the very top of your approval and leaving no reserves.
Questions to Ask Your Loan Officer
- What's my maximum approval, and what payment does it assume?
- What would my total monthly cost be at a lower price?
- Which loan programs fit my situation?
- Will I need mortgage insurance?
- How much cash will I need to close?
- Are there assistance programs I might qualify for?
- What can I do to improve my approval?
Your Affordability Worksheet
| Item | Monthly estimate |
|---|---|
| Principal and interest (from Loan Estimate) | $ |
| Property taxes (based on purchase price) | $ |
| Homeowners insurance (quote) | $ |
| HOA dues | $ |
| Mortgage insurance (if any) | $ |
| Total monthly housing cost | $ |
| Other monthly debts | $ |
| Total monthly obligations | $ |
| Gross monthly income | $ |
| Take-home monthly income | $ |
| Monthly living expenses (non-housing) | $ |
| Monthly savings goal | $ |
| What's left | $ |
| Cash item | Amount |
|---|---|
| Down payment | $ |
| Closing costs (from Loan Estimate) | $ |
| Reserves after closing | $ |
| Moving and setup | $ |
| Total cash needed | $ |
Don't Forget Ongoing Homeowner Costs
The worksheet covers your loan, taxes, insurance and HOA. But owning a home has other costs renters often don't think about:
- Maintenance and repairs. Water heaters, roofs, appliances and plumbing all need care.
- Utilities that may be higher than in a rental, especially for a larger home.
- Landscaping and yard care.
- Furniture and setup for a new space.
- Commuting costs if your new home is farther from work.
Set aside a monthly amount for maintenance from the start. It turns surprise repairs into planned ones.
A Hypothetical Example
This example is made up to show the process. It is not based on any real client or loan, and it does not show rates or payments.
A couple uses an online calculator and sees a number they like. They start touring homes at the top of that range.
When they get pre-approved, the lender's number is close to the calculator's. But when we fill in the worksheet with real property tax estimates, insurance quotes and HOA dues for the condos they like, the total monthly cost is higher than they expected. Their childcare costs also leave less room than the calculator assumed.
They decide to look a bit lower and include townhomes without high HOA dues. They find a home that fits their comfort number and keep their savings cushion.
Frequently Asked Questions
How much house can I afford on my income?
It depends on your total monthly housing cost, debts, down payment, credit and reserves, not income alone. A pre-approval gives you a real number.
What is debt-to-income ratio?
Your monthly debt payments divided by your gross monthly income. Lenders use it to measure your ability to repay. Limits vary by program and lender.
Are property taxes based on the seller's tax bill?
No. In California, they're based largely on your purchase price.
Should I buy at my maximum pre-approval?
Not necessarily. Your comfortable budget may be lower than what you're approved for.
How much do I need for a down payment?
It depends on the loan program. Some programs allow smaller down payments. Ask a loan officer.
What's the difference between pre-qualification and pre-approval?
Pre-qualification is usually a quick estimate. Pre-approval is a deeper review of your documents and credit. I'll cover this in a future post.
Can you help me figure out my budget?
Yes. I can help with both the home search and the financing review.
Do lenders count bonus or RSU income?
Some programs consider bonus, commission or stock-based income, with rules on how long you've received it and how it's documented. Ask your lender how they'll treat yours.
Should I wait until I have a bigger down payment?
It depends on your goals, the market and your situation. A bigger down payment lowers your loan and payment, but waiting has its own trade-offs. I don't try to time the market. Let's look at your numbers.
Does buying a condo make my budget go further?
Sometimes. Condo prices can be lower, but HOA dues add to your monthly cost. Compare total monthly costs, not just prices.
The Bottom Line
How much house you can afford in the Bay Area depends on your total monthly housing cost, your other debts, your down payment, your cash reserves and a real pre-approval, not income alone. And what you're approved for may be more than what's comfortable.
Use real numbers: property tax estimates based on purchase price, insurance quotes, HOA dues and your lender's Loan Estimate. Then choose a price range you can live with.
Ready to see your real budget? Get pre-approved, and I'll help you turn your numbers into a home search that fits.
Sources
- Redfin housing market pages (data through September 2026, accessed October 26, 2026): Pleasanton https://www.redfin.com/city/14986/CA/Pleasanton/housing-market · Fremont https://www.redfin.com/city/6671/CA/Fremont/housing-market · San Jose https://www.redfin.com/city/17420/CA/San-Jose/housing-market · Milpitas https://www.redfin.com/city/12204/CA/Milpitas/housing-market · Castro Valley https://www.redfin.com/city/21841/CA/Castro-Valley/housing-market · San Leandro https://www.redfin.com/city/17447/CA/San-Leandro/housing-market · Hayward https://www.redfin.com/city/8439/CA/Hayward/housing-market
- C.A.R., "September home sales and price report," released October 19, 2026: https://www.car.org/aboutus/mediacenter/newsreleases/2026releases/sept2026sales
- Consumer Financial Protection Bureau, "What is a debt-to-income ratio?": https://www.consumerfinance.gov/ask-cfpb/what-is-a-debt-to-income-ratio-en-1791/
- Consumer Financial Protection Bureau, Loan Estimate explainer: https://www.consumerfinance.gov/owning-a-home/loan-estimate/
- California State Board of Equalization, California Property Tax: An Overview, Publication 29, March 2025: https://www.boe.ca.gov/proptaxes/pdf/pub29.pdf
- Santa Clara County Assessor: https://asr.santaclaracounty.gov/home
- Alameda County Assessor, Supplemental Assessment: https://www.acassessor.org/homeowners/supplemental-assessment/
Get pre-approved and see your real budget. Call or text me at 408-780-1188, or email onrealtygroup@gmail.com.
Oanh Nguyen · Broker & Loan Officer · On Realty Group, brokered by LPT Realty · BRE #02133991 · NMLS 2020335
Equal Housing Opportunity.
Loan disclosure: Oanh Nguyen, Broker | Loan Officer, On Realty Group, brokered by LPT Realty, BRE #02133991, NMLS #2020335. This post is general education, not a loan offer, rate quote or commitment to lend. Loan programs, guidelines and eligibility change and are subject to lender review and approval.
Disclaimer: This post is general information only, not an appraisal or legal, tax or financial advice; data comes from the public sources linked above, is believed reliable but not guaranteed, and can change at any time.