The Real Cost of Owning a Home: Taxes, Insurance, Maintenance and Reserves

Every mortgage calculator shows a payment. None of them shows the tax notice in October, the insurance renewal that came in a third higher, the $14,000 roof or the HOA special assessment. The "cost of owning a home" is that second list, and it varies more from one address to the next than the mortgage does. This guide takes the list line by line with the official figures behind each, then adds them up for a house at the Los Angeles County median.

What a full year of ownership contains beyond the mortgage payment

Six lines, in the order they usually arrive:

1. Mortgage principal and interest. The largest line for most buyers, and the only one a calculator gets right. On September 24, 2026, Freddie Mac's weekly survey came in at 7.03 percent for the 30-year fixed³.
2. Property tax. Set by the county from an assessed value and a rate; deductible within limits.
3. Insurance. Homeowners cover, plus flood or earthquake policies where the risk maps and the lender require them.
4. Maintenance and capital reserves. Small repairs every year, large components every decade or two.
5. HOA dues where the property belongs to an association, with the risk of special assessments.
6. Utilities and energy. Electricity, gas, water, sewer, trash; the size of this line depends on the building's efficiency.

A landlord runs the same list before setting a rent, because the rent has to clear it; the how much can I rent my house for guide starts from the income side of the same ledger. For an owner-occupier the list decides whether a house that "fits the budget" on the lender's screen fits it in October.

Property tax: how the bill is set, county rates, and the reset on sale

The mechanism is the same everywhere: the assessor assigns an assessed value, exemptions come off, and the taxing authorities apply their rates. The result differs enormously because assessment ratios, exemptions, rates and reassessment cycles are all local. The useful comparison number is the effective rate: the tax bill divided by the home's market value, which is how the Tax Foundation and the Lincoln Institute compare places¹⁴.

Source: Tax Foundation, from 2024 Census ACS five-year estimates¹. The full county table stretches further than these ten rows, from under 0.2 percent in a few rural counties (Maui is among the five lowest) to more than 2 percent in parts of Illinois and New Jersey¹. At the state level the same data run from 0.29 percent in Hawaii and 0.37 percent in Alabama through 0.70 percent in California and 1.40 percent in Texas to 1.88 percent in Illinois and New Jersey¹. On a $400,000 house that is roughly $1,160 a year in Hawaii, $2,800 in California, $5,600 in Texas and $7,520 in New Jersey, before any local exemption.

Two mechanics matter more than the rate. First, reassessment on sale: in many places the buyer's assessed value is reset from the purchase price, so a long-time owner's bill tells the buyer little; ask the county what the bill will be at your price. Second, appeals: the assessed value is a mass-appraisal estimate, and where it exceeds what comparable sales support you can challenge it. Both are explained in the guide to assessed value versus market value.

For federal income tax, real estate taxes are deductible if you itemize, within the state and local tax limit of $40,000 ($20,000 if married filing separately) for 2025, a limit that shrinks above $500,000 of modified adjusted gross income but not below $10,000⁵. Charges for services, assessments for local benefits such as new sidewalks or sewers, and transfer taxes are not deductible as real estate taxes⁵. This is general information, not legal or tax advice.

Homeowners, flood and earthquake insurance: the premium jump since 2018

Insurance used to be the line nobody thought about. The Federal Insurance Office at the Treasury analyzed policy-level data for 2018 through 2022 and reported that the average premium per policy grew 8.7 percent more than the inflation rate over those years, with wide differences by region and ZIP code². In the fifth of ZIP codes carrying the highest expected annual losses from climate-related perils, the average premium was $2,321, 82 percent above the fifth with the lowest expected losses, and insurers declined to renew more often there as well². The release ties the spread to communities hit by substantial weather events, from severe storms in the Great Plains to hurricanes in the Southeast, and it appeared on January 16, 2025, while the Los Angeles wildfires were still burning².

Flood is a separate policy. A standard homeowners policy excludes flood, and for buildings inside a FEMA special flood hazard area the purchase is not optional: a federally regulated lender cannot originate, increase, extend or renew a loan on such a building unless flood insurance covers the outstanding principal or the maximum available, whichever is less; it must accept a qualifying private policy; and if the borrower has not bought cover within 45 days of notice, the lender buys it and charges the premium back⁶. Premiums for residential loans are escrowed with the mortgage payment⁶. Whether your address is inside such a zone, and what that does to the price, is the subject of the flood zone by address guide.

Earthquake cover is likewise excluded from standard policies and sold separately where the risk exists, usually with a high deductible. Owners in seismic regions should price it before they buy, not after the first tremor.

Maintenance and capital reserves: the 1 to 4 percent rule against the component method

The rule of thumb everybody quotes is to budget 1 to 4 percent of the home's value a year for maintenance and repairs: 1 percent for a newer house in a mild climate, more for an old house in a hard one. It is a reasonable first number and a poor final one, for two reasons. A roof costs about the same on a $300,000 house as on a $900,000 house in the same town, so the percentage understates the cost of cheap homes and overstates it for expensive land. And the rule says nothing about when the money will be needed.

The component life-cycle method fixes both. List the major components, estimate each one's replacement cost and remaining life, and divide. An illustrative schedule for a 2,000-square-foot house, all figures example assumptions:

That is close to 1 percent of an $800,000 house and 2.6 percent of a $300,000 one, which is the point: reserves scale with the building, not with the land under it. Size and age push the number up. The median new single-family home sold in 2025 measured 2,194 square feet⁷, and most of the stock is far older; the American Housing Survey, the Census Bureau's HUD-sponsored survey of the nation's housing, is where the age and condition of that stock are recorded⁸. Keep the reserve in a separate account and fund it monthly; a reserve that exists only in a spreadsheet is a future loan.

HOA dues, utilities and energy: the lines people forget

HOA dues pay for shared elements: roofs and elevators in a condominium, roads, pools and gates in a planned community. They are fixed monthly, they rise, and when the association's own reserve is short the owners receive a special assessment for the difference. Before you buy into an association, read its budget and reserve study, not just the current dues. HOA assessments are not deductible on your federal return⁵.

Utilities depend on the building as much as on the household: insulation, windows, the heating system, a pool pump or a large lawn can double the line between two houses of the same size. Utilities are a personal expense for an owner-occupier and not deductible⁵; a landlord who includes them in the rent deducts them as a rental expense.

Energy upgrades move the line and sometimes the value. Insulation, a heat pump, efficient windows and owned solar cut the utility bill for the life of the house; the guide to noise, energy and neighborhood factors covers how buyers price them.

Owning a $946,950 Los Angeles home costs $7,006 a month all in

A hypothetical buyer purchases a single-family house at $946,950, the August 2026 median for existing single-family homes in Los Angeles County reported by the California Association of Realtors⁹, with 20 percent down and a 30-year mortgage of $757,560 at the 7.03 percent Freddie Mac average for late September 2026³. All lines other than the price and the rate are example assumptions.

In the first year about $53,300 of the mortgage payments is interest and about $7,400 is principal; the principal is saving, not cost, so the economic cost of the year is closer to $76,700. Set against that: the tax deduction for interest and property tax if you itemize, within the limits above⁵, and whatever the house gains or loses in value. The lines beyond the mortgage add 39 percent to the payment in this example; in a high-tax county they can add more than half.

Ownership costs in a CheckValue report, read next to value and rent

For this question the useful part of a CheckValue report is the ownership-cost estimate: a figure for the address that sits in the same report as the market value, so the price and the bills can be read together. Two of the report's maps feed the same budget. The flood map tells you whether a flood policy will be a line at all, and the energy map gives a first reading of the utility line before you have a single bill. Because the report also carries a rent estimate and gross yield, a landlord sees at once whether the rent clears the costs.

What it does not know: your insurer's quote, your HOA's budget or your loan terms, and it is not a licensed appraisal. Use the free preview of the report for your address as the first draft of the table above, then replace the assumptions with quotes.

Cutting the cost: assessment appeals, insurance shopping, energy upgrades

Appeal the assessment when it exceeds what comparable sales support. Assessed values come from mass appraisal, and the appeal windows are short and fixed by the county; the assessment guide linked above walks through the evidence an appeal needs.

Shop the insurance every renewal. Premium and availability now differ sharply by insurer and ZIP code²; ask about deductibles, mitigation credits for a new roof or wildfire-resistant materials, and bundling. If you are in a flood zone, compare an NFIP policy with a private one; the lender must accept a qualifying private policy⁶.

Fund the reserve, then spend it on prevention. A serviced furnace, cleaned gutters and a roof inspection every few years are the cheapest lines in the schedule and prevent the most expensive ones.

Upgrade for energy where the payback is short. Insulation and sealing usually come first, then the heating and cooling system when it is due anyway, then solar if you own it outright.

The same bills seen by an owner-occupier and by a landlord

Every line above appears in a landlord's budget too, with two additions and one difference. The additions are a vacancy allowance and management, whether paid to a manager or in your own time. The difference is tax: an owner-occupier deducts mortgage interest and real estate taxes within limits and nothing else from the list, not insurance, not utilities, not HOA dues⁵; a landlord deducts all of them against rental income, which is why the same house can be a heavy cost for the family living in it and a break-even investment for the owner who rents it out. The gross yield and cap rate guide shows how the cost lines turn a gross yield into a net one, and the rent it out or sell guide uses the same budget to compare keeping a house with selling it.

This is general information, not legal or tax advice.

This article is general information, not legal, tax or investment advice. Figures and rules carry the year they were published; check the cited source for the current version.

Christian Eckmair

Co-founder, CheckValue · More than 20 years in real estate in Tenerife and Austria · Reviewed by Josef Eckmair MBA

Christian Eckmair is co-founder of CheckValue and of CBDNOL GmbH (Ansfelden, Austria). He has worked in real estate for more than 20 years in Tenerife and Austria – buying, renovating, letting and selling residential property – and writes about home values, buying checks and ownership records.

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