A $200,000 household income sounds like buying power. In most of the country, it is. In San Diego, at today's rates, it puts you somewhere between a 1,200-square-foot condo in Clairemont and a tear-down in a fringe ZIP code — and a wide range of online calculators will tell you you can afford much more than that.
The gap between what lenders will approve and what you should actually spend is the whole story. Here's the real DTI math at today's San Diego rates, plus three realistic buyer profiles on a $200K income — each with different debts, different down payments, and very different outcomes.
Why the 28/36 rule doesn't work in San Diego
The classic affordability rule says housing should be 28% of gross income or less, and total debt should be 36% or less. On a $200K household income, that's $4,667 per month for housing — and an all-in payment of $6,000 including other debts.
That budget doesn't buy a house in most of San Diego County right now. At today's San Diego rates — 6.23% on a 30-year fixed as of late April 20261 — a $4,667 housing payment covers a purchase price of roughly $725,000 with 20% down, once you bake in San Diego property tax, Mello-Roos in many newer subdivisions, insurance, and HOA. Median sale prices across most of the county are well above that.
So the question buyers actually face isn't "what does the 28/36 rule say I can afford?" It's "how far above 28% am I willing to go, and what changes when I do?"
What lenders will actually approve
Lender DTI math is more permissive than the textbook 28/36 rule, and that's where most first-time San Diego buyers lose the plot.
- Conventional loans typically allow back-end DTI up to 45%, and up to 50% with strong compensating factors (large reserves, high credit score, big down payment), per Fannie Mae underwriting guidelines.2
- FHA loans can go up to 56.9% back-end DTI when the automated underwriting system approves it, per HUD Handbook 4000.1.3
- VA loans have no hard DTI cap but use a residual income test instead — the residual minimum for a household of four in the Western region on a loan above $80,000 is $1,158 per month after housing and debts.4
On a $200K gross income — about $16,667/month — a 45% back-end DTI is $7,500/month for total debt service. If you have no other debts, that whole $7,500 can go to housing. At today's rates, that approves you for a purchase price somewhere around $1.15M with 20% down.
That's the number a lender will give you. Whether you should actually borrow it is a different question.
The pre-approval letter you receive shows the maximum a lender will approve — not the amount you should target. Lenders qualify you on gross income and theoretical DTI. They don't see your retirement contributions, your kids' daycare, your actual lifestyle. The "approved up to" figure is a ceiling, not a budget.
The real San Diego DTI math
Here's what the math actually looks like at today's rates on a $200K income, three different ways. All three use the same income, same rate (6.23% on a 30-year fixed),1 the same property tax assumption (1.18% effective, which sits within the 1.02%–1.19% range typical for San Diego County tax rate areas),5 and the same insurance load. The variables are down payment, other monthly debts, and target purchase price.
Conservative · ~26% housing DTI · No other debtsScenario 1: The patient saver
Two earners, $200K combined, no car loans, no student loans, $200K saved for a down payment. Wants to keep housing comfortably below 30% of gross income.
| Line item | Amount |
|---|---|
| Target purchase price | $725,000 |
| Down payment (~28%) | $200,000 |
| Loan amount | $525,000 |
| Principal & interest (6.23%, 30yr) | $3,226 |
| Property tax (1.18%) | $713 |
| Insurance + HOA | $280 |
| Total monthly | $4,219 |
| Housing DTI | 25.3% |
What it buys you: a 2-bed condo in North Park or Hillcrest, a small 3-bed in La Mesa or Allied Gardens, or a 2-bed townhome in Mira Mesa. Comfortably below the lender ceiling, comfortably below stress.
Stretch · ~41% back-end DTI · One car paymentScenario 2: The realistic buyer
Same $200K income, $150K saved, a $550/month car payment, and a target of buying a real single-family home. Willing to push housing past the 28% line into the high 30s.
| Line item | Amount |
|---|---|
| Target purchase price | $925,000 |
| Down payment (~16%) | $150,000 |
| Loan amount | $775,000 |
| Principal & interest (6.23%, 30yr) | $4,762 |
| Property tax (1.18%) | $910 |
| Insurance + HOA | $240 |
| PMI (loan-to-value above 80%) | $310 |
| Total monthly housing | $6,222 |
| Plus car payment | $550 |
| Total debt service | $6,772 |
| Back-end DTI | 40.6% |
What it buys you: a 3-bed in older Rancho Peñasquitos, an entry-level home in El Cajon or Santee, a townhome in Carmel Valley. This is the budget most $200K San Diego households actually run.
Lender ceiling · 47% back-end DTI · Newer subdivisionScenario 3: Maxed out
Same $200K, $180K saved, $400/month in student loans, willing to buy in a newer subdivision with Mello-Roos.6 Pushing the lender's back-end DTI ceiling.
| Line item | Amount |
|---|---|
| Target purchase price | $1,050,000 |
| Down payment (~17%) | $180,000 |
| Loan amount | $870,000 |
| Principal & interest (6.23%, 30yr) | $5,345 |
| Property tax (1.18%) | $1,032 |
| Mello-Roos / CFD | $425 |
| Insurance + HOA | $320 |
| PMI | $348 |
| Total monthly housing | $7,470 |
| Plus student loans | $400 |
| Total debt service | $7,870 |
| Back-end DTI | 47.2% |
What it buys you: a newer 4-bed in Otay Ranch, 4S Ranch, or Del Sur. The lender's AUS may approve this — but the buyer is committing nearly half of every gross dollar to debt service before food, retirement, daycare, or savings. The Mello-Roos figure alone moves this scenario from comfortable to tight.
The line items the calculators get wrong
Online affordability calculators tend to under-bake three things in San Diego. Each one can shift the realistic budget by $50K–$150K of purchase price.
- Effective property tax rate. The base rate is 1% under Proposition 13, but voter-approved bonds and special assessments push the real effective rate to roughly 1.02%–1.19% across most San Diego County tax rate areas, before any Mello-Roos.5 Calculators using a flat 1.0% understate your monthly by $100–$200.
- Mello-Roos. If you're shopping anywhere built since the late 1980s, assume you'll be looking at parcels with CFD assessments authorized under the Mello-Roos Community Facilities Act of 1982.6 $300–$650/month is normal in the newer master-planned communities.
- Insurance. California homeowners insurance has risen sharply in recent years, with State Farm alone receiving rate approvals of 6.9%, 6.9%, 20%, and 17% across 2022–2025 and Allstate approved for an average 34.1% increase in 2024.7 The $80/month estimate from a national calculator may be off by multiples for a home in an inland or hillside ZIP.
A national calculator that bakes in a 1.0% tax rate, $0 Mello-Roos, and $80 insurance will tell a $200K San Diego household they can comfortably afford an $1.1M home. A San Diego calculator with the right inputs may put the same household at $850K.
Run the math on a specific San Diego scenario.
Open the calculator →What changes the answer
If the conservative budget feels tight and the stretch budget feels stressful, that's the actual San Diego experience on $200K. A few levers can move the needle meaningfully.
Down payment leverage
Going from 10% down to 20% down on a $900K home cuts the monthly by roughly $750 — about $580 of interest plus the elimination of PMI. That's not nothing. But the cash gap is $90,000, which most $200K households don't have lying around. The honest tradeoff isn't "save more"; it's "buy less house, sooner, or a similar house, later."
Loan type
An FHA loan with 3.5% down opens the door at lower up-front cash but adds permanent mortgage insurance on most loans originated today. A VA loan, if you qualify, eliminates both PMI and the down payment requirement — a meaningful advantage in San Diego specifically because of the high concentration of military households. A conventional loan with less than 20% down still beats FHA on PMI removability for most credit-strong borrowers.
Buying with a CFD-light parcel
Older neighborhoods — North Park, La Mesa, original Scripps Ranch, Allied Gardens — have no Mello-Roos at all. The same $4,500 budget that buys a smaller older home in those ZIPs buys a bigger newer home in Otay Ranch — but the bigger home comes with $400+ in CFD that doesn't show up in the listing photos.
Rate movement
Every 50 basis points of rate movement changes purchase power by roughly 5–6% on the same monthly payment. If you're house-hunting actively, run the math at three rate scenarios: today's rate, today minus 50 bps, today minus 100 bps. That tells you which side of "affordable" the home really sits on if rates drift.
The honest answer to the headline question
A $200K San Diego household can comfortably buy a home in the $700K–$850K range, can stretch into the $925K–$1.0M range with discipline and a decent down payment, and will be lender-approved for up to roughly $1.10M–$1.15M at today's rates. The gap between "comfortable" and "approved" is about $300K of purchase price — and it's the most expensive gap in personal finance.
Run the math on the specific parcel you're considering. Plug in the actual property tax, the actual CFD if any, and a real insurance quote — not a national average. Then ask whether the budget still works after retirement contributions, after daycare, after groceries, after the occasional vacation. If it does, you've got the answer.
If you want to skip the spreadsheet, our San Diego affordability calculator uses local property tax assumptions and lets you add Mello-Roos as a line item — closer to reality than the generic version your bank's website runs.
Scenarios use illustrative figures based on representative parcels and current published rates. Your actual rate, taxes, insurance, and DTI calculation will depend on credit profile, lender, parcel, and underwriting. Educational content only — not legal, tax, or financial advice.
References
- Freddie Mac. (2026, April 23). Primary Mortgage Market Survey: U.S. weekly mortgage rate averages. https://www.freddiemac.com/pmms
- Fannie Mae. (n.d.). B3-6-02, Debt-to-income ratios. Selling Guide. Retrieved April 28, 2026, from https://selling-guide.fanniemae.com/sel/b3-6-02/debt-income-ratios
- U.S. Department of Housing and Urban Development. (n.d.). Single Family Housing Policy Handbook 4000.1. Retrieved April 28, 2026, from https://www.hud.gov/program_offices/housing/sfh/handbook_4000-1
- U.S. Department of Veterans Affairs. (n.d.). VA Pamphlet 26-7, Lenders Handbook, Chapter 4: Credit underwriting. Retrieved April 28, 2026, from https://www.benefits.va.gov/warms/pam26_7.asp
- San Diego County Treasurer-Tax Collector. (n.d.). Secured property taxes. Retrieved April 28, 2026, from https://www.sdttc.com/content/ttc/en/tax-collection/secured-property-taxes.html
- California Government Code § 53311 et seq., Mello-Roos Community Facilities Act of 1982. https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?sectionNum=53311&lawCode=GOV
- California Department of Insurance. (2025, May 13). Commissioner Lara adopts judge's ruling on State Farm emergency rates, balancing consumer protections and financial solvency [Press release]. https://www.insurance.ca.gov/0400-news/0100-press-releases/2025/release038-2025.cfm