How much can you spend on a house? This is the first question those looking for their first home in Rancho Cucamonga often ask. In the past, the answer was straightforward if your income was roughly in line, but now you also need to consider credit scores, DTI, and the type of loan.

In order, there are four main factors to check: loan type, down payment, credit score, and DTI.

First is the loan type. An FHA loan requires a down payment of 3.5% if your credit score is 580 or higher, and 10% if your score is between 500 and 579 (according to FHA.com). Conventional loans allow for a 3% down payment if you are a first-time homebuyer or if your income is at or below 80% of the area median income; otherwise, the standard is typically 5%. If you put down less than 20%, PMI will apply, and it is waived if you put down 20% or more (according to NerdWallet).

Next is the size of the down payment. According to Zillow, the average home value in Rancho Cucamonga is $779,614, which has decreased by 1.1% over the past year (as of May 31, 2026). If you put down 10% at this price point, the loan amount would be about $700,000, and applying a fixed interest rate of around 6.6% (ranging from 6.55% to 6.72%, according to Freddie Mac PMMS as of July 2026) would result in a monthly principal and interest payment of about $4,480.

The third factor is the credit score. Depending on your score range, not only the down payment requirements but also the actual interest rates will vary. Even with the same loan amount, a lower score will result in a higher interest rate, and the total interest accumulated over 30 years can be significant. In the past, many buyers did not pay much attention to this difference, but now it is increasingly common to check scores before getting pre-approved.

The fourth factor is DTI, or debt-to-income ratio. Lenders look at the sum of your monthly principal and interest payments along with existing debt repayments compared to your monthly income, typically setting a cap around 43%. If your monthly expenses are around $5,000, you would need a pre-tax monthly income of about $11,600 to comfortably meet this requirement. By checking these four factors in advance and getting pre-approved, your budget remains stable when making an offer.

Closing costs also need to be accounted for separately. They typically range from 2% to 5% of the loan amount and include escrow, title, appraisal fees, and prepaid property taxes and insurance. California property tax is based on a 1% assessment value according to Prop 13, with additional local assessments. The average effective tax rate statewide is about 0.71% (according to propertytaxrates.org), but in San Bernardino County, where Rancho Cucamonga is located, there are many developments subject to Mello-Roos, so it is safer to check the tax details for each property directly.

The fifth item to consider is the rate lock. In the past, it was common to verbally agree to lock in a rate, but now it is standard to specify a lock period of 30 to 45 days in writing. If this period is exceeded, a re-lock fee applies. The earnest money is typically set at 1% to 3% of the purchase price and is deposited into escrow, contributing to the down payment at closing. In the past, during times of high competition for offers, this period was often kept short, but now it is safer to allow for ample time considering inspection and appraisal schedules.

To reduce the burden of the down payment, you might consider CalHFA's MyHome Assistance Program. It offers a second loan of up to 3.5% of the purchase price based on FHA loan criteria, with repayment deferred until the sale or refinancing. First-time homebuyer requirements and completion of homebuyer education are prerequisites. This article is not investment or legal advice, and tax and loan conditions may vary by county and individual circumstances, so it is advisable to consult with a loan officer and experts before finalizing any contracts.