Lyme's Assessments Just Jumped. Why That Number Won't Tell You Your Tax Bill

This fall, Lyme property owners got a letter from Avitar Associates with a new assessment. Many of those numbers were far higher than the ones on last year's bill. On October 6 the town followed up with a correction. A template letter it had circulated earlier said values were up about 59% townwide. The town says that figure was a clerical error, and the preliminary revaluation actually shows a 73% increase.

If you're house hunting in Lyme right now, this matters as much as it does for anyone who already owns there. The annual tax figure on every Lyme listing this fall uses old assessments multiplied by an old rate. Neither number will survive the December bill.

Why the tax line on a Lyme listing is out of date

A property tax bill in New Hampshire comes from two numbers. One is the assessed value. The other is the rate per $1,000. Lyme's 2025 rate was $28.19 per $1,000. Of that, $18.60 went to local education, $6.41 to the town, $1.69 to state education and $1.49 to the county, according to the NH Department of Revenue Administration's 2025 municipal tax rate report.

Both of those numbers are changing at once. Avitar's job was a full statistical revaluation update, valuing property as of April 1, 2026, with the goal of bringing assessments to 100% of fair market value. When the town's total assessed value goes up, the rate needed to raise the same budget goes down. The town's revaluation update says the rate "will drop proportionally barring any significant changes in spending voted in at the Town & School District annual meetings." It also warns owners not to multiply a new assessment by the current rate, because "this will produce an inaccurate tax amount."

This is why the tax figure on a listing can't be trusted this season. Two Lyme homes listed at similar prices can show very different tax figures because their old assessments had drifted from market by different amounts. Comparing Lyme with Hanover or Lebanon on taxes alone has the same problem. You'd be setting a pre-revaluation number from one town against a post-revaluation number from another.

The jump is mostly a catch-up

Most of the 73% reflects how far Lyme's assessments had fallen behind sale prices before this update. Each year the DRA measures how closely a town's assessments track actual sale prices. For 2025, Lyme's median ratio was 58.6%. In other words, the typical property was assessed at a bit under 59 cents for every dollar it would likely sell for. The 2024 median ratio was 64.0%, so the gap had been growing.

Do the math on a typical property assessed at 58.6% of market. Raising its assessment by 73% brings it to roughly 101% of market. So the headline number mostly measures how far assessments had fallen behind, built up over years of rising sale prices. The 2026 market alone doesn't explain it.

New Hampshire requires this kind of correction. Under RSA 75:8-a, assessors must reappraise real estate to full and true value at least every fifth year.

Your share of the levy decides your bill

Revaluation changes who pays what share. It doesn't change how much the town collects. The DRA's Assessing Reference Manual says "the total amount of monies collected by the municipality is not affected by the revaluation." The voted budget sets the total. If budgets stay flat, a property's bill goes up or down depending on how its change in value compares with the town's average change.

The DRA's own example uses an owner whose assessment rises 10% in a town whose total rises 15%. That owner ends up carrying a smaller share of the tax burden. Here's the same logic at Lyme's scale, purely as an illustration. It assumes budgets stay the same, and it isn't a forecast:

1. Assessment rose 50%. Your value grew more slowly than the town's 73%, so your share of the levy shrinks. In this simplified case your bill would be about 13% lower than last year.
2. Assessment rose about 73%. You moved with the town, and your share stays about where it was.
3. Assessment rose 90%. Your value grew faster than the town's, so your share grows. Here your bill would be roughly 10% higher.

Dividing the 2025 rate by 1.73 puts it near $16 per $1,000. That only shows how the mechanism works. Spending votes at the town and school district meetings, and the separately set state education portion, can move the real rate either way.

Property values seldom change at the same pace or for the same reasons across property types. Chapter 7 of the DRA's revaluation guidance, which Lyme posts on its own site, makes that point. The town hasn't published a breakdown of the preliminary increase by property type. That means the 73% figure tells no one which of the three cases above applies to their own house.

What happened next door

Lebanon and Hanover went through the same thing recently, and their numbers show how uneven a revaluation can be.

Lebanon is the clearest example. Single-family assessments there rose faster than the city's total. So even with a rate that fell almost a fifth, the Valley News noted that some bills could still go up. Before that update, Lebanon's median assessment sat at about 73% of market, with its previous revaluation done in 2022, the Valley News reported in September 2025. Lyme's 2025 median of 58.6% was further from market than that, which helps explain why Lyme's townwide jump is so much bigger than Lebanon's.

The calendar from here

This post goes up on Thursday, October 22. By then, Avitar's window for phone appointments has closed. The town set the deadline at 4:00 p.m. on Monday, October 19, 2026, and said no appointments would be scheduled after that date. It also said more times might be added if needed. Here's what's still ahead:

• Questions and record cards. Owners can still send questions through the inquiry form at the bottom of Avitar's appointment page. The town says online property record cards stay available for 60 days from the notice date, with login steps on its revaluation page. If you don't have internet access, the Town Office is at (603) 795-4639.
• Rate setting. The DRA sets municipal rates in the fall. As a reference point, the state's report shows Lyme's 2025 rate was set on October 24, 2025. No 2026 date has been published.
• December bill. The new assessments go into the new rate, and that rate is applied to the December tax bill.
• March 1. Under RSA 76:16, written abatement applications to the Select Board are due by March 1 following the notice of tax.
• July 1 and September 1. According to Lyme's abatement information, the Select Board has until July 1 to decide. An appeal to the BTLA or Superior Court must be filed by September 1. Taxes are still due as billed while an abatement is pending.
• April 15. Lyme lists April 15 as the deadline for Current Use applications and for exemption and credit applications.

All of this is general information, not legal, tax or financial advice. If you're weighing an abatement or an exemption, check your own situation with the town, the assessor or a qualified professional.

Quick answers

Does a 73% higher assessment mean a 73% higher tax bill?

No. The town says the rate will drop in proportion unless spending changes significantly, and it warns against multiplying a new value by the current rate. Your bill depends on how your property's change compares with the town's.

Why did the town first say 59%?

The town's October 6 message says a template letter from Avitar carried a clerical mistake. The official letters showed 73%.

I'm buying in Lyme this winter. What tax figure should I use?

Until the December bill comes out, any listing's tax figure is a pre-revaluation number. Once the 2026 rate is set, the new assessment times the new rate is the figure to compare with other towns.

Whether you're pricing a Lyme home to sell this winter or comparing it with homes across the river, a figure that reflects the new assessments is a better starting point than last year's bill. LIVE UV LIFE follows the Lyme market closely, and we're glad to walk you through what your home's value looks like now. Get a Free Home Valuation and we'll put it next to recent sales.