Rental property cash flow calculator for San Marino, CA
Starts from local data for San Marino, CA (ZIP 91108): a 3-bedroom rent of $3,915 a month (range $3,500–$4,330), the Los Angeles County property tax rate of 0.68% and the 7.32% 30-year mortgage rate. Every value stays editable.
Monthly cash flow
-$252.80
Annual cash flow
-$3,034
Cash-on-cash
-5.28%
Cap rate
5.17%
DSCR
0.81
NOI (monthly)
$1,078
Mortgage (P&I)
$1,331
- Loan amount
- $200,000
- Cash invested
- $57,500
- Collected income / mo
- $2,090
- Operating expenses / mo
- $1,012
How this is calculated
- 1Collected income = (rent + other income) × (1 − vacancy %).
- 2Operating expenses = property tax ÷ 12 + insurance ÷ 12 + HOA + utilities + other + maintenance % and CapEx % of rent + management % of collected income.
- 3NOI (net operating income) = collected income − operating expenses.
- 4Mortgage payment uses the standard fixed-rate formula on the loan amount (price × (1 − down payment %)).
- 5Cash flow = NOI − mortgage payment.
- 6Cap rate = annual NOI ÷ purchase price. Cash-on-cash = annual cash flow ÷ (down payment + closing costs + rehab). DSCR = NOI ÷ mortgage payment.
Not included: income taxes, depreciation, appreciation and loan principal paydown. Those affect total return but not monthly cash flow.
Frequently asked questions
- What rent should I use for a 3-bedroom rental in San Marino, CA?
- In ZIP 91108 the typical figure is $3,915 a month ($3,500–$4,330); across San Marino's 2 ZIP codes it's $3,500–$4,330, with a median of $3,838. Check listings for the specific property.
- What is the property tax rate in San Marino, CA?
- Owner-occupied homes in Los Angeles County pay a typical 0.68% of their value a year (Census ACS, median taxes paid ÷ median home value, Dec 31, 2024). Investors often pay more after a purchase: the home is reassessed at the sale price and there is no homestead exemption.
- What is the current 30-year mortgage rate?
- The 30-year fixed rate averaged 7.32% in the week of Oct 22, 2026 (Freddie Mac PMMS via FRED). It's a national average for owner-occupied loans; investment property loans usually cost more.