In North County, financing is usually what decides the purchase — not the house, the payment. And the payment here carries two line items that a calculator built for the national market simply does not have: Mello‑Roos and HOA dues. Between them they routinely move a Carlsbad or San Marcos payment by several hundred dollars a month, which is often the difference between a house that works and one that does not.

So this page does two things. The calculators below treat those numbers as primary inputs instead of footnotes, so what you see is close to what you will actually write a check for. The rest of it explains, in plain terms, what a lender is really looking at — and where to find the true figures for a specific address instead of guessing.

One thing worth saying up front: I am a real estate broker, not a lender. I do not originate loans and I am not paid when you get one. What I can do is make sure you walk into that conversation already knowing what the numbers mean.

Run your own numbers

Five calculators. Everything updates as you type, and nothing here asks for your email.

What actually goes into your payment

Almost everyone shopping online is looking at principal and interest, because that is the number the big portals put in front of you. It is rarely more than three quarters of the real thing. Here is the whole stack.

Principal and interest is the loan itself, and it is the only piece that never changes on a fixed-rate mortgage. Property tax is roughly one percent of what you paid, plus voter-approved add-ons — and note that it is based on your purchase price, not the seller's old assessment, which is where a lot of budgeting goes wrong. Homeowners insurance in coastal and fire-adjacent North County has stopped being a rounding error; get a real quote early rather than plugging in a placeholder, because in some pockets it now drives the deal.

Then the two local ones. HOA dues are common here and range from nominal to substantial, and if a community has both a master association and a sub-association you pay both. Mello‑Roos applies to a lot of the newer master-planned neighborhoods and to none of the older ones, and it is the single most misunderstood number in North County real estate. Finally, mortgage insurance if you put down less than twenty percent, which is not a penalty so much as the price of buying sooner.

Mello‑Roos, explained straight

Proposition 13 capped what cities could collect in ordinary property tax. That left them with a problem: new neighborhoods still needed streets, sewers, schools and parks, and there was no longer a way to fund them out of the general roll. The answer, in 1982, was the Community Facilities District Act — better known by the names of its authors, Senator Henry Mello and Assemblyman Mike Roos. A district forms, it issues bonds to build the infrastructure, and the parcels inside the district repay those bonds through a special tax.

The practical consequence is the thing to understand. Two houses of nearly identical value, a mile apart, can have meaningfully different tax bills, because one sits inside a CFD and the other does not. Newer master-planned development in Carlsbad and San Marcos frequently carries it. Older established neighborhoods, built before 1982, generally do not. But that is a tendency, not a rule, and it is not something to take on faith from a listing description.

Three things people get wrong. It is a bond, so it has an end date — but the end date can be decades out, and some districts levy a separate ongoing services component that does not expire on the same schedule. It arrives on the same bill as your property tax but it is generally not deductible as property tax, because it funds improvements benefiting specific parcels rather than general government; confirm your own situation with your CPA. And it is recorded — a Notice of Special Tax Lien sits against the parcel and will surface in your preliminary title report, which means you have a formal opportunity to read the actual terms rather than accept a summary.

Property taxes, and the bill nobody warns you about

Under Proposition 13 the base rate is one percent of assessed value, with voter-approved bonds and district charges layered on top. In practice most North County parcels land modestly above one percent. The number that matters is the parcel's actual bill, which is public information, so there is no reason to estimate when you are down to a specific house.

The part that catches people is the supplemental bill. When you buy, the county reassesses the property to your purchase price. The regular bill already in the system was calculated on the seller's old assessed value, which after years of Proposition 13 protection can be a fraction of what you just paid. So a separate supplemental bill comes for the difference, often several months after you have closed and settled in, and it is generally not covered by your impound account unless you specifically arrange it. It is entirely predictable and it still ruins people's month. Budget for it.

Moving in the other direction: if you are over 55 and selling a long-held North County home, Proposition 19 may let you carry your existing assessed value to a replacement primary residence anywhere in California, up to three times. For a downsizing move that can be worth more per month than the interest rate you negotiate. We work with a lot of buyers doing exactly this in Ocean Hills Country Club and the other 55+ communities.

HOA dues, and how lenders actually see them

A lender counts one hundred percent of your monthly HOA dues against your debt-to-income ratio, treated no differently from principal, interest, taxes and insurance. Run the arithmetic and it is sobering: at a 6.5 percent thirty-year rate, every hundred dollars a month of dues costs you roughly $15,800 of loan amount. Six hundred a month is about $95,000 of purchase power. Mello‑Roos does the same thing. This is why two buyers with identical incomes can qualify for very different houses.

There is a second, less obvious way an association can affect your loan. Condominiums and some planned developments require project approval, not just borrower approval — the lender examines the association's reserves, its owner-occupancy ratio, pending litigation, delinquency rates and the adequacy of its master insurance policy. A perfectly qualified buyer can be stopped cold by the building. Ask for the current budget, the reserve study, and any pending special assessment while you still have contingencies, and have your lender look at them early rather than in the final week.

Worth flagging in this market specifically: California master-policy premiums have moved sharply, and dues can rise between the day you tour a place and the day you close. Ask whether an increase has been voted or is under discussion.

Getting to an approval that actually means something

The words get used loosely, and the difference matters when you are competing. A pre-qualification is a conversation — someone took your numbers verbally and told you roughly what they think. A pre-approval means a lender pulled credit and reviewed documents. A fully underwritten approval means an actual underwriter has signed off on your file and the only thing left is the property. In a multiple-offer situation on a good Carlsbad house, that third one is what separates a credible offer from a hopeful one, and it is worth the extra week to get.

To move quickly, have ready: two years of tax returns and W-2s, your two most recent pay stubs, two months of statements for every account you will draw on, and documentation for any large or irregular deposit. If you are self-employed, add two years of business returns and a year-to-date profit and loss. Deposits that cannot be sourced are the most common avoidable delay I see.

On loan types, briefly. Conventional conforming is the mainstream product, and in San Diego County for 2026 the one-unit limit is $1,104,000, with the national baseline at $832,750 — loans in between are usually called high-balance. Above the county limit you are in jumbo, where reserve and credit standards tighten but rates are sometimes surprisingly competitive. FHA allows 3.5 percent down with more forgiving credit, at the cost of mortgage insurance that generally stays for the life of the loan. And VA deserves specific mention here, because Camp Pendleton is next door: no down payment, no monthly mortgage insurance, a funding fee that is waived for many veterans with a service-connected disability, and no loan limit at all with full entitlement. If you are eligible, it is frequently the strongest option on the board and it is badly underused in Oceanside and Vista.

Shop at least two or three lenders, and do it on the same day so you are comparing the same market. Then compare the Loan Estimate forms line by line rather than the rate anyone quoted you on the phone. That single habit saves more money than any negotiation I can do on the purchase price.

Who I point people to for mortgage questions

North County financing, answered