Property Tax on a $430K Home at a 7.03% Mortgage Rate: New Jersey's $9,589/Year vs. Tennessee's $2,064 — and the $861/Year Appeal That Closes Part of the Gap

Your mortgage quote just came back at 7.03%, and the lender's estimate lists property tax as an afterthought. That afterthought can add up to $9,589 a year on the same $430,000 house that costs $2,064 a year somewhere else.

Realtor.com News ran a mortgage calculator piece this week on what it takes to buy a $430K home at 7.03%, after rates hit their highest level in more than a year. Realtor.com also reported that Fed Governor Michael Barr warned housing affordability has hit a 21-year low. Most buyers respond by shopping lenders. Almost nobody shops the other big monthly number, which is property tax.

This post does three things. It shows what a $430K home actually costs in property tax by state. It explains the difference between the nominal rate and your effective rate. And it walks through a worked appeal that saves $861/year and is worth about $5,565 over eight years.

What a $430K Home Costs at 7.03%: The Payment Before Tax

Assume 20% down. That is a $344,000 loan at 7.03% over 30 years. The principal-and-interest payment comes to about $2,296/month.

That number is identical in every state. Property tax is what changes, and it is usually the largest line in your escrow after the loan itself. Home insurance is the next-largest line, and Realtor.com's piece on home insurance fine-print blind spots is worth reading for that reason. Insurance is mostly beyond your control at the policy level. Property tax is different, because you can check whether the number it's based on is correct.

Property Tax by State on a $430K Home

Based on Tavirex's analysis of 13,144 data points, including the tax_foundation_rates dataset (255 rows) and our census_acs_county_taxes dataset (6,281 county-level rows), here is what a $430K home costs at approximate state-average effective rates. These are averages. Your county can land well above or below them.

State	Approx. effective rate	Annual tax	Monthly tax	Total monthly (P&I + tax)
New Jersey	2.23%	$9,589	$799	$3,095
Illinois	2.07%	$8,901	$742	$3,038
Texas	1.60%	$6,880	$573	$2,869
Florida	0.86%	$3,698	$308	$2,604
California	0.71%	$3,053	$254	$2,550
Tennessee	0.48%	$2,064	$172	$2,468
Hawaii	0.27%	$1,161	$97	$2,393

The gap between New Jersey and Tennessee is $7,525/year, or $627/month. At 7.03%, each $1,000 of loan costs roughly $6.67/month in principal and interest. That means $627/month of extra tax offsets about $94,000 of borrowing power. Same house, same lender, same credit score.

This is why Barr's affordability warning is only half the story. The 21-year low in affordability depends partly on what the buyer's state charges every year after closing. For a fuller state-by-state view, see our property tax by state comparison for a $430K home and the Hawaii vs. New Jersey breakdown.

This is the kind of comparison Tavirex runs for you, so you don't have to build the spreadsheet yourself.

Nominal Rate vs. Effective Rate: Why Your Bill Doesn't Match the Headline

"Why is my tax bill 2.25% of what my house is worth when the posted rate is 2.05%?" It's a common question, and the answer is the assessment ratio.

• Nominal rate: the rate the taxing bodies apply to assessed value. It is the sum of school, county, municipal, fire, and library levies.
• Effective rate: your actual tax divided by your home's true market value.

If your assessed value equals market value, the two match. If the assessor overvalues you, your effective rate rises even though nobody changed the nominal rate.

The lincoln_institute_ratios dataset (51 rows) shows how much states differ in the way they assess. Some assess at a stated fraction of market value, some assess at 100%, and some cap annual increases. That is why a nominal rate can't be compared across state lines. Only the effective rate on true market value is comparable.

The iaao_reassessment dataset (51 rows) tracks how often each state reassesses. The IAAO ratio-study standard treats a median assessment ratio between 0.90 and 1.10 as acceptable for residential property, with a coefficient of dispersion under 15%. A home at 1.10 or above is at the outer edge of "acceptable" and is still paying about 10% too much.

Worked Example: The $430K Home Assessed at $472,000

The scenario: your assessment notice says $472,000. Three recent sales of similar homes on your street and the next one over all closed between $415,000 and $445,000, averaging $430,000.

Step 1: Compute your assessment ratio. $472,000 ÷ $430,000 = 1.098, or about 110%

Step 2: Compute your current tax. Nominal rate 2.05% × $472,000 = $9,676

Step 3: Compute your effective rate. $9,676 ÷ $430,000 = 2.25%

Step 4: Compute the tax at a correct assessment. 2.05% × $430,000 = $8,815

Step 5: Annual savings. $9,676 − $8,815 = $861/year, or about $72/month

Here is what that is worth over your ownership period, assuming a 5% discount rate and eight years of ownership:

• Present value factor for eight years at 5%: 6.463
• $861 × 6.463 = about $5,565

That assumes the reduction holds. In some states the correction carries forward, and in others you re-file. At 7.03%, $72/month of tax relief also supports roughly $10,750 of additional loan capacity if you're still buying, which is more than most rate-shopping saves.

Compare that to the effort. A DIY appeal costs the price of a few hours and usually a small or zero filing fee. The ntuf_appeal_stats dataset (six rows sourced from the National Taxpayers Union Foundation) supports the widely cited pattern that a large share of homes are over-assessed, that only a small percentage of owners ever appeal, and that a majority of those who do get some reduction. Not every assessment is wrong. But if yours is, few people ever check.

You can model this for your specific situation at Tavirex.

How to Build the Comparable Sales Case

Assessors and appraisers use the same method, and you can too.

1. Pull 3 to 5 sales from the last 6 to 12 months. Match neighborhood, square footage within about 10%, age, lot size, and condition.
2. Adjust for differences. If your comp has a finished basement and yours doesn't, subtract a defensible value for it. If your comp is 300 square feet larger, adjust downward.
3. Compute the median, not the best-case outlier. Hearing officers discount cherry-picked comps.
4. Compare to your assessment. If your assessed value is more than about 5% above the comp-supported value, you probably have a case.
5. Document condition. Photos of deferred maintenance, foundation issues, or a dated kitchen support a lower value.

Sales at or near asking price count as evidence too. When Realtor.com reported that Meg Ryan sold her Bridgehampton home for its full $15.25 million ask, that kind of sale is exactly what an assessor uses to set neighborhood values. In a market with rising rates but tight inventory, sales like that push assessments up, which makes it more important that your comps are current and specific to your block.

If you own in a place with sharply different sub-markets, our Suffolk County exemptions breakdown shows how second-home and primary-residence rules diverge.

Appeal Deadlines Are State-Specific: Check Yours Now

Deadlines are the most common way a good case dies. These are general timelines. Confirm the date on your own notice, since counties differ.

State	Typical appeal window	Where you file
New Jersey	April 1 (or 45 days after a reassessment notice)	County Board of Taxation
Texas	May 15 or 30 days after notice	Appraisal Review Board
Florida	25 days after TRIM notice	Value Adjustment Board
Georgia	45 days from notice	County Board of Equalization
Maryland	45 days from notice	Supervisor of Assessments
California	July 2 to Nov 30 (regular roll)	Assessment Appeals Board
Illinois (Cook)	Varies by township	Assessor, then Board of Review

For state-specific walkthroughs, see our Cobb County, Georgia appeal guide, Florida VAB guide, or Illinois Cook County guide.

Check Exemptions Before You Appeal

An appeal fixes the value. An exemption reduces the taxable amount, and unclaimed ones are the easiest money on the table. The ncsl_exemptions dataset (204 rows) covers homestead, senior, veteran, and disability programs across all 50 states and shows how wide the range is. Some states offer meaningful homestead exemptions. Others offer little or nothing for a primary residence.

Before you file, confirm:

• Your primary residence is enrolled in the homestead program, if your state has one.
• You've applied for any senior, veteran, or disability exemption you qualify for.
• Your exemption didn't drop off after a purchase, refinance, or inheritance.

Our Texas exemptions guide shows how these stack in one state. Exemptions and appeals aren't either/or. Do both.

A Note on the Tax Complexity Cost

The Tax Foundation reports that Americans will spend 6.9 billion hours complying with IRS filing and reporting requirements in 2026, costing about $387 billion in lost productivity, plus another $157 billion in out-of-pocket costs. That's more than $544 billion in total. That figure covers federal compliance, not property tax. But it explains why homeowners skip appeals and exemption filings: the system feels like more paperwork on top of an already exhausting tax life.

Property tax appeals are one of the few places where that time pays off directly. A two-to-four-hour DIY appeal that saves $861 a year is a better hourly return than most of what people do with their weekends. It also stays inside the rules. The goal isn't to pay less than you owe. It's to pay what's accurate.

What to Do This Week

1. Find your assessment notice or county record and write down the assessed value and the nominal rate.
2. Compute your effective rate: annual tax divided by realistic market value. If it's well above your state's average from the table above, look closer.
3. Pull three to five comparable sales and compute your assessment ratio.
4. Check your deadline. If it's within 30 days, start now.
5. Confirm every exemption you qualify for is active.
6. If you're still buying, get the actual county tax figure for the specific address before you lock a rate. Don't rely on the state average.

At 7.03%, every dollar of ongoing cost matters more, because you can't refinance your way out of it yet. An accurate assessment is a permanent fix. A rate you refinance later is a bet.

If you'd like your own numbers instead of state averages, Tavirex will compare your effective rate, assessment ratio, and appeal savings using county-level data, so you can see in a few minutes whether your bill is worth challenging.

This article is general educational information, not legal or tax advice. Rules, deadlines, and rates vary by state and county, so confirm details with your local assessor or a qualified professional.

Data behind this post

The figures above are computed from the product's own reference tables, last refreshed 2026-09-20:

• 6,281 rows from census_acs_county_taxes
• 6,287 rows from census_acs_housing
• 9 rows from config_defaults
• 51 rows from iaao_reassessment
• 51 rows from lincoln_institute_ratios
• 204 rows from ncsl_exemptions
• 6 rows from ntuf_appeal_stats
• 255 rows from tax_foundation_rates

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Sources

• Mortgage Calculator: Here’s How Much You Need To Buy a $430K Home at a 7.03% Rate — Realtor.com News
• Meg Ryan Sells Hamptons Home for Full $15.25 Million Asking Price—Just 2 Years After Buying It — Realtor.com News
• The Fine Print in Your Home Insurance Policy Could Cost You Thousands. Here Are the Blind Spots To Check — Realtor.com News
• Fed Official Sounds Warning on Housing as Affordability Hits 21-Year Low — Realtor.com News
• Tax Complexity Now Costs the US Economy over $544 Billion Annually — Tax Foundation