Your Tax Bill Went Up. Your House Lost Value. Mind the Gap.

For a decade the story was simple: your assessment rose because your house was worth more, so a bigger tax bill just tracked a bigger paper gain. That link broke in 2025. ATTOM's annual property tax analysis, released April 9, 2026, shows local governments levied $396.8 billion on more than 89.6 million single-family homes in 2025, up 3.7 percent from 2024, while the average estimated home value fell 1.7 percent to $494,231. Bills up, values down, same year.

The effective rate hit a five-year high

When the bill climbs and the value under it shrinks, the effective rate rises by arithmetic alone. ATTOM puts the 2025 national effective rate at 0.9 percent, up from 0.86 percent in 2024 and the highest since 2020. The average bill went from $4,300 to $4,427.

That 0.9 percent sounds trivial until you translate it into payment. On a home near the national average, property tax runs about $370 a month before any mortgage or insurance. Buyers do not shop by list price. They shop by the full monthly nut: principal, interest, taxes, insurance. When the tax line rises on its own, it eats budget that would otherwise go toward your price. A rising local rate is a quiet markdown on what a buyer can bid.

The bill lands in the seller's mailbox, but it prices the buyer's offer. In a year of flat-to-down values, a tax line moving the wrong way compresses your realizable price even when your automated home estimate looks fine.

"Property taxes" is your county's story, not the nation's

The national average hides a spread wide enough to change a selling decision. ATTOM's 2025 data puts Illinois at a 1.84 percent effective rate, New Jersey at 1.58 percent, Vermont at 1.4 percent, Connecticut at 1.36 percent, and Ohio at 1.32 percent. New Jersey's average bill hit $10,499. At the low end sit Hawaii at 0.33 percent, Idaho at 0.39 percent, Wyoming at 0.40 percent, and Arizona and Alabama at 0.43 percent. A 1.5-point gap on a $500,000 home is roughly $7,500 a year in carrying cost, budget bid away from your price.

The direction is diverging too. Census Bureau figures show property tax collections up 4.6 percent year over year in the first quarter of 2026, the fastest-growing major state and local tax line. Yet some states are cutting the other way. Iowa's 2026 reform, signed in May 2026, caps taxable-value growth at 3.0 percent per property class and puts hard ceilings on local levy rates. Arizona's HB 2792, effective for tax year 2026, fully exempts the primary residence of veterans rated 100 percent service-connected disabled.

That split is the actionable part. Where the tax trajectory bends down, buyer affordability gets a tailwind and so does your price. In a high-rate state where levies keep climbing, the tax line works against your list price every month you wait. Check your state's market report alongside its tax direction before you set an asking number.

Our own data shows how thin the price cushion is. Across the roughly 26,300 ZIP markets we track, the typical US home is worth about $289,803 as of July 2026, up 3.0 percent on the year. In Arizona, our 300 ZIP markets sit near $392,647 and are down about 0.5 percent. When appreciation is low single digits or negative, a 3 percent jump in the tax bill is not noise. It can outrun a full year of price growth.

The assessment-lag trap

One timing wrinkle to check before you list. In many jurisdictions the assessed value driving your bill lags the market by a year or more. If your assessment still reflects the 2024 peak while buyers price today's softer market, you are paying tax on value you cannot recover in a sale. That will not cut your bill, but it should reset expectations. The assessor's number is not what a buyer will pay.

Run your sale math off recent comparable sales, not off the assessment notice. Then pull your county's tax direction. If rates are being capped or cut, time favors you. If levies keep rising in a flat-price market, the tax line is discounting your house for you, and every month of waiting widens the cut.