The annual property tax figure on a Mooresville listing this fall comes from a value Iredell County set as of January 1, 2023. That value stops counting on January 1, 2027. On that date the county's reappraisal takes effect, and every one of its just over 110,000 parcels gets a new assessed value. Assessor Andy Alexander said in the county's October 2 update that "as of the effective date of the reappraisal, all assessed values must reflect 100% of market value."

If you buy now, you will own the house when that new number arrives. How much a bill grows after a reset depends on two things: how far the market has moved since the last valuation, and what local governments do with their rates once the tax base grows. Iredell and the Town of Mooresville have already shown how they handle the second part, in 2023. Sales data since then gives a rough answer to the first, and it points at the upper end of the market.

What the tax line on a listing is actually measuring

An assessment is only true on its valuation date. After that it drifts. The North Carolina Department of Revenue tracks the drift each year with a sales assessment ratio study, which compares assessed values to actual sale prices. In the study based on 2023 sales, Iredell's median ratio was 92.53%. In the next study, based on 2024 sales, it fell to 90.90%. That newer figure means the typical home that sold in Iredell in 2024 was assessed at about 91 cents for every dollar of its sale price. The state's ratio study page has published nothing more recent than that.

So a 2023-based tax figure on a listing doesn't measure what the house is worth today. It measures the house at the county's last valuation date. The January 2027 reset brings that figure back up to market value, whatever market value turns out to be.

The calendar between now and the first new number

The dates line up with the fall and winter buying season:

1. October 6, 2026. The Board of Commissioners holds a public hearing on the proposed Schedule of Values, the county's appraisal manual for the 2027 to 2030 tax years, and is expected to vote on it that night.
2. Now through year-end. Staff are "verifying all new sales data as it comes in and rechecking the sales ratios of each neighborhood to see if there are any minor changes that need to be made, up or down," Alexander said.
3. January 1, 2027. The new values take effect.
4. Second week of February 2027. The county expects to mail notices showing owners their new values.
5. Spring 2027. Appeal windows open. Details are below.

The county has not published a countywide estimate of how much values will rise. Its October update includes one example: a $200,000 home outside town limits reassessed at $210,000 would owe $59 more if 2026 rates stayed the same. The county presents that as an illustration of the math, and it is not a forecast. Alexander also stressed that the rate stays a separate variable, because "tax rates can change from year to year." That is where the 2023 record matters.

What happened the last time Iredell reset values

In the 2023 reappraisal, Iredell's values rose 42%. The county's own budget message called that one of the lowest increases among the 16 counties in its informal survey. In Mooresville, the increase ranged from 39% to 64% depending on the property and averaged about 44%, according to Lake Norman Publications' May 2023 budget coverage.

North Carolina law requires a revenue-neutral rate in every reappraisal year. Under G.S. 159-11(e), the budget officer has to publish the rate that would bring in the same revenue the old rate would have produced without the reappraisal, adjusted for normal growth. Governments publish that rate as a comparison. They are not required to adopt it. Here is what each government published in 2023 and what it adopted:

Both governments lowered their rates. Mooresville's cut was close to 10 cents from a rate the town had kept for 15 years. Both new rates still sat well above revenue-neutral. Lake Norman Publications reported that with the 48.36-cent rate, Mooresville owners' municipal tax bills for FY24 would rise between 16% and 37%. Its worked example went further. A Mooresville property whose value rose 44% would have paid more in town taxes even at the revenue-neutral rate, because the revenue-neutral rate keeps total collections flat, and an owner whose value rose faster than average still pays a bigger share.

Neither rate has changed since. The county's FY2026-27 budget ordinance sets the rate at 50 cents. Mooresville's FY2026-27 budget proposal, as Iredell Free News reported in May 2026, kept the town rate at 48.36 cents. Both governments will have to publish new revenue-neutral rates with their 2027 budgets. The 2023 record shows that a published revenue-neutral rate and an adopted rate can end up several cents apart.

Why this reset may land harder at the top of the market

The 2023 reset averaged about 44% in Mooresville, but individual properties ranged from 39% to 64%. A reappraisal moves each property by its own amount, and the spread can be wide.

Canopy MLS monthly reports hint at where the spread may fall this time. In March 2023, two months after the last valuation date, Mooresville's median sales price was $459,900 and the average was $653,570. In August 2026, the median was $521,030 and the average was $839,777. Over that stretch the median rose about 13.3% and the average about 28.5%.

An average climbs faster than a median when sales at the high end pull it upward. In Mooresville, that high end includes lakefront and luxury homes along the Lake Norman shoreline. If those homes gained more than the middle of the market since 2023, their 2023 assessments are further behind, and their 2027 resets would be larger. These are single-month figures, though, and they partly reflect which homes happened to sell in March 2023 versus August 2026. They don't track the same houses over time. Take the gap between median and average as a sign of where values may be moving fastest. It is not a forecast for any particular address.

Running the number on a specific house

You can still test a listing before February. For a home inside Mooresville town limits, the county's 50 cents and the town's 48.36 cents add up to 98.36 cents per $100 of assessed value, using the FY2026-27 rates reported above. Owners may also owe other district charges. At those rates, every $100,000 of added assessed value adds about $984 a year to a combined county and town bill. That assumes both rates stay the same, which the 2023 table shows can't be assumed.

A practical way to check a listing:

• Find the home's current assessed value in Iredell County's property records and compare it to the asking price or your offer.
• Remember that the county's goal is to set each value at 100% of market as of January 1, 2027. A recent arm's-length sale price is one data point the assessor's office reviews when it checks neighborhood ratios.
• Multiply the gap by the combined rate to get a rough range. Treat it as an estimate until the February notice and the 2027 budgets come out.

This is planning arithmetic, not tax advice. Your closing attorney or a tax professional can explain how taxes get prorated at your closing.

If the February notice looks wrong

Under the proposed 2027 Schedule of Values, appeals go through three steps. First, an owner appeals to the County Assessor within 30 days of the notice date. Next comes the Board of Equalization and Review, which must first meet between the first Monday in April and the first Monday in May. An owner can ask for a hearing before the board adjourns, or within 30 days of the last value notice. The board sends its decision within 30 days of the hearing. Last, an owner can appeal to the North Carolina Property Tax Commission within 30 days of the date on the board's Notice of Decision. The county says it will advertise the actual 2027 board dates locally. The schedule was still a proposal before the October 6 vote, so check the final deadlines on the county's Assessor Division page once it is adopted.

A short FAQ

Will my tax rate go down after the reappraisal? No one knows yet. In 2023, the county and the town both cut their rates, and both stopped above the revenue-neutral rate. Neither government has proposed a 2027 rate.

Does a big jump in value mean my bill jumps by the same percentage? Not necessarily. Your bill is your assessed value times whatever rates the county and town adopt. If rates fall, the bill rises by less than the value does. Even so, in 2023 owners whose values rose faster than average still paid more at the revenue-neutral rate.

Does a home I buy this fall get reassessed at my purchase price? The county values all parcels as of January 1, 2027, and checks sales against neighborhood ratios. Your purchase is evidence in that process, but the county sets the value.

On a Mooresville listing, the tax line matters most when you know where it is headed. At Besecker & Maynard Group, our buyer reps check a home's 2023 assessment against current sales before you write an offer, so the February notice isn't the first time you see your new number. If you're thinking of selling, we can show you where your home's value stands next to its assessment. Get your free home valuation.