Sussex County Tax Estimator

How property tax works in Sussex County

Your bill is the assessed value of your home multiplied by the combined rate of every authority that taxes it — the county, the school district, the city or township, and often a fire or library district. Those rates are set separately and added together, which is why two houses of identical value on opposite sides of a district line can owe different amounts.

Across Sussex County, the median home is worth $353,300 and the median property tax bill is $1,171. Dividing one by the other gives the effective rate of 0.331% used above. That is the honest way to estimate a bill without knowing which districts a specific address falls into.

Income tax in Delaware, while you are here

Delaware taxes income through 7 brackets, up to 6.60%, on top of the property tax above. Work out your Delaware income tax.

Sussex County in the national picture

Sussex County is in the cheapest tenth of the United States for property tax. Its effective rate of 0.33% sits below 0.46%, the line that separates the bottom 10% of the 3,132 counties we have data for from everyone else. In practical terms, an owner here pays less than half what the median American county charges on the same house.

For scale, the range across the whole country runs from about 0.08% at the bottom to 3.64% at the top. That is a spread of more than twenty to one on the same house, and it is decided almost entirely by where the line on the map falls rather than by anything about the property itself.

What 0.33% costs at each price point in Sussex County

The rate is a percentage, so the bill scales straight with the value the assessor puts on the property: $200,000 → $663 a year ($55 a month); $350,000 → $1,160 a year ($97 a month); $500,000 → $1,657 a year ($138 a month); $750,000 → $2,486 a year ($207 a month); $1,000,000 → $3,314 a year ($276 a month).

The median home in Sussex County is assessed around $353,300, which is why the typical bill here lands near $1,171. If you are looking above that price, read the row that matches your budget rather than the median — the median describes the county, not your purchase.

One caveat that catches people out: these figures use assessed value, and in many states that is not the same as the price you paid. Some states assess at a fixed fraction of market value, and some cap how fast an assessment can rise for an existing owner. Both make the published rate look higher or lower than what a specific household actually pays.

What property tax takes out of a Sussex County income

Median household income in Sussex County is $78,162 and the median property tax bill is $1,171. That is 1.5% of gross household income going to property tax alone — before any income tax, before FICA, and before the mortgage the tax sits on top of.

At 1.5% this is a manageable share by national standards, but note what it is measured against: median income, not your income. A retiree on a fixed income in the same house pays the same bill as the household earning $78,162, which is why almost every state has some form of senior or disability relief and why it is worth asking the assessor whether you qualify.

This is also the number that rent quietly reflects. A landlord in Sussex County pays the same $1,171 on a comparable property and prices it into the lease, so the tax reaches renters too — it just arrives without a bill attached.

Why Delaware counties charge such different rates

Property tax is set locally, so Delaware does not have one rate — it has 3. They run from 0.33% in Sussex County to 0.74% in New Castle County, with Sussex County at 0.33%, 1st cheapest of 3.

That is a comparatively tight range for a US state — 2.2 to one between the extremes — which usually means Delaware funds a large share of school costs at state level rather than leaving districts to raise it locally. Where the state carries more, local rates converge.

The practical consequence is that a rate you were quoted for Delaware as a whole is close to meaningless. The number that applies to you is the one for your county, and often for your district within it.

Property tax and income tax in Delaware, together

Delaware taxes income as well as property, so a full picture of what living in Sussex County costs needs both. The property side is local and is on this page; the income side is set at state level and applies wherever in Delaware you live.

The two are worth adding together rather than comparing separately, because states trade them off against each other. A state with a low income tax often leans harder on property, and vice versa — which is why a single-tax comparison between two states can point the wrong way.

What the Sussex County figure is, and what it is not

The 0.33% on this page is an effective rate: the Census Bureau's median property tax paid in Sussex County ($1,171) divided by its median home value ($353,300), both from the American Community Survey five-year estimates. It is a real, citable measure of what owners here actually pay.

It is not a millage rate, and it is not the number on your tax bill. Your bill is the sum of every levy that reaches your parcel — county, school district, city or township, and often a fire, library or water district — applied to your assessed value after any exemption you qualify for. Two houses of the same value on opposite sides of a district line in Sussex County can owe different amounts, and both are correct.

Use this figure to compare Sussex County against other places and to sanity-check an escrow estimate. Use the assessor's roll to find out what you owe.

Sussex County at a glance

Sussex County has a population of about 247,799, 147,904 housing units, and a median household income of $78,162.

At that size there are typically a handful of taxing districts inside the county, so the rate on this page is an average across them rather than the figure for any one address.

The Delaware rules that change your Sussex County bill

Delaware assessed at 100% of a base year, and the base years had gone unmoved for four decades: Sussex County last reassessed in 1974, New Castle in 1983, Kent in 1987. A 2020 Court of Chancery ruling forced a statewide reassessment — Kent billed on new values in 2024, New Castle and Sussex in 2025 — and in New Castle assessed values rose by an average of 433%. If you are looking at Delaware figures from before that, they describe a system that no longer exists.

Delaware’s Senior School Property Tax Credit covers 50% of regular school property tax, capped at $500, from age 65 — but the residency test is unusually harsh and got harsher: anyone who established domicile from 1 January 2018 onward needs TEN consecutive years in the state before qualifying. Applications close 30 April.

These are Delaware rules and they apply in every county in the state, Sussex County included. What varies locally is the rate, not the relief — so if you qualify for the relief and have not claimed it, the Sussex County assessor is where that gets fixed.

The ten-year figure, which is the one that decides a purchase

A single year's property tax is a number people accept without much thought. The decade is the number that changes decisions, because unlike a mortgage it never amortises away and unlike income tax it does not fall when your income does.

On Sussex County's median home value of $353,300, held ten years with assessed value rising 4% a year, Sussex County collects about $14,057. The cheapest county in the state collects $14,057 over the same period and the dearest $31,436 — a spread of $17,378 on identical property, decided entirely by location.

The same house at the national median rate of 0.84% would run $35,508 over ten years, so Sussex County costs about $21,451 less across the decade than a typical American county would.

Set that against the mortgage to see the weight of it. On a $353,300 purchase the ten-year property tax bill in Sussex County is roughly 5% of the amount financed at 80% loan-to-value — before insurance, before maintenance, and before any millage increase. It is the largest recurring cost of ownership after interest, and the only one that a district can raise without asking you.

A rate in the national bottom decile makes this the smallest of the recurring ownership costs, below insurance in many years. The trap that creates is complacency about the base: where the tax is low, owners rarely scrutinise the assessment, and a reassessment after a long gap arrives as several years of market movement at once with no habit of challenging it.

Appealing a Sussex County assessment: what it is worth

You cannot appeal the tax rate — that is set by budget votes you have no standing to challenge individually. What you can appeal is the assessor's opinion of your property's value, and that is a factual claim you can be right or wrong about.

The arithmetic decides whether it is worth your afternoon. On the median home in Sussex County, $353,300, the bill runs about $1,171 a year. A 10% reduction in assessed value is worth roughly $117 a year, and because the corrected value carries forward it is nearer $586 across five years. Under $60 a year, the paperwork rarely pays; over $400, it usually does.

At this size a formal challenge is rarely worth the afternoon, and the better use of the same effort is the record itself: a factual correction costs one phone call and is usually granted without a hearing. Save the comparable-sales route for a year in which the valuation moves sharply, which in a lower-value area typically follows a reassessment cycle rather than arriving annually.

Also check the record itself before arguing valuation, because errors are commoner than contested opinions: square footage that includes an unfinished basement, a bathroom that does not exist, a garage counted twice, land area from a survey predating a lot split. A factual correction is usually granted without a hearing.

The deadline in Delaware: Applications close 30 April. Miss it and there is generally no remedy until the following cycle, whatever the merits — property tax appeal windows are short and strictly applied, and they typically start from the date the notice was mailed rather than the date you opened it.

How the bill is paid, and what happens if it is not

Most owners with a mortgage never pay this directly. The servicer collects roughly $98 a month alongside principal and interest on the median Sussex County bill, holds it in escrow, and pays the county when it falls due. The consequence is that a rise reaches you as a change in your monthly payment months after the fact, with no obvious connection to the assessment notice that caused it.

Read the annual escrow analysis when it arrives. It shows the bill actually paid, and it is the cheapest way to catch an assessment you would have appealed had you noticed — by the time the payment changes, the appeal window for that year has usually closed.

The weight here is light: the median bill is 1.50% of median household income, so escrow rarely drives a purchasing decision and an increase is absorbed rather than felt. The consequence worth knowing is the reverse of the usual complaint — where the tax is small relative to income, owners tend not to open the assessment notice at all, and unclaimed exemptions go unnoticed for years.

Unpaid property tax is also secured against the house itself, which is what separates it from every other tax. States permit a tax lien, and eventually a tax sale, at the end of a statutory redemption period. It is slow and heavily noticed, so it is nearly always avoidable — but the mechanism means an unpaid property tax bill can never simply be written off the way an unpaid income tax debt sometimes is.

What actually sets your Sussex County bill

Three numbers decide your bill, and the rate is only one of them. The first is assessed value, and Delaware does not reach it by a single fixed fraction. Delaware assessed at 100% of a base year, and the base years had gone unmoved for four decades: Sussex County last reassessed in 1974, New Castle in 1983, Kent in 1987. A 2020 Court of Chancery ruling forced a statewide reassessment — Kent billed on new values in 2024, New Castle and Sussex in 2025 — and in New Castle assessed values rose by an average of 433%. If you are looking at Delaware figures from before that, they describe a system that no longer exists.

The second is how fast that value is allowed to move. We have not loaded a statewide cap for Delaware, so assume your assessment can follow the market unless your assessor tells you otherwise.

The third is the combined rate of every authority that reaches your parcel — the county, the school district, the city or township, often a fire or library district. They are set separately and added, which is why two houses of identical value on opposite sides of a line in Sussex County owe different amounts and both figures are correct.

Buying in Sussex County? Read this first

Property tax is the part of the monthly cost buyers most often underestimate, because it does not surface until the lender builds the escrow. On a $400,000 home in Sussex County it adds roughly $110 a month on top of principal, interest and insurance — $1,326 a year.

One rule to check before you rely on the seller's number: whether Delaware revalues the property when it changes hands. Where it does, the seller's bill can understate yours badly; where it does not, you inherit their position. We have not loaded that rule for Delaware, so ask the Sussex County assessor directly rather than assuming.

Then ask what relief you qualify for in your first year. Applications close 30 April. Relief that is not claimed is not given.

If your Sussex County assessment looks wrong

You can contest the assessed value. You cannot contest the rate — that is set by elected bodies and is not open to appeal. So the question to answer before filing is narrow: would this property actually sell for what the assessor says it is worth?

Gather comparable sales close to the assessment date rather than to today. An assessor is defending a valuation as of a particular day, and recent sales that postdate it carry little weight.

Applications close 30 April. The Sussex County assessor's office is where the clock is published, and missing it costs the whole year — there is no late appeal in most jurisdictions.

Sussex County property tax questions

How much is property tax in Sussex County?

The effective rate in Sussex County is 0.33%, from a median tax bill of $1,171 on a median home value of $353,300. On a $400,000 home that is about $1,326 a year, or $110 a month once it is in escrow.

Is property tax high in Sussex County?

No, the opposite: Sussex County is in the cheapest tenth of the United States at 0.33%, against a national median of 0.84%.

Which Delaware county has the lowest property tax?

Sussex County at 0.33%, with New Castle County the most expensive at 0.74%. Sussex County sits at 0.33%, 1st cheapest of the 3 Delaware counties with published data — the cheapest in the state.

Will my Sussex County tax bill change when I buy?

That depends on whether Delaware revalues a property when it changes hands, and we have not loaded that rule for Delaware. It matters: in states that reassess on sale, the seller's bill can badly understate what you will pay. Ask the Sussex County assessor before you rely on the current figure.

Do seniors pay property tax in Sussex County?

Delaware’s Senior School Property Tax Credit covers 50% of regular school property tax, capped at $500, from age 65 — but the residency test is unusually harsh and got harsher: anyone who established domicile from 1 January 2018 onward needs TEN consecutive years in the state before qualifying. Applications close 30 April. That is a Delaware rule and it reaches Sussex County like every other county in the state; the Sussex County assessor or treasurer handles the application.

Is my Sussex County home taxed on its full market value?

Not straightforwardly. Delaware assessed at 100% of a base year, and the base years had gone unmoved for four decades: Sussex County last reassessed in 1974, New Castle in 1983, Kent in 1987. A 2020 Court of Chancery ruling forced a statewide reassessment — Kent billed on new values in 2024, New Castle and Sussex in 2025 — and in New Castle assessed values rose by an average of 433%. If you are looking at Delaware figures from before that, they describe a system that no longer exists.

Can I appeal my Sussex County assessment?

You can contest the assessed value, but not the rate — the rate is set by elected bodies and is not open to appeal. Applications close 30 April. The Sussex County assessor's office publishes the current window, and in most jurisdictions there is no late appeal.

Does Delaware have an income tax as well?

Yes. Delaware taxes income at graduated rates up to 6.60%, on top of the property tax on this page. Worth adding the two together before comparing Delaware against anywhere else.

Do I need a parcel number to use this calculator?

No, and that is deliberate. The Sussex County assessor's own estimator generally asks for one, which is fine if you already own the property and useless if you are deciding whether to buy it. This works from the home value instead. It is an estimate built on the county's effective rate, which averages across every district inside Sussex County, so your exact bill depends on your district combination and on any exemption you qualify for. For the binding figure, the Sussex County assessor or treasurer is the authority.