Tools · September 30, 2026

The notice in the mail is a valuation event

By Ryan Standley, Publisher / Authorized Officer, Record of Sale, LLC

A higher assessed value is not, by itself, a vote to raise the tax rate. This page turns the two numbers on an assessment notice into old tax, new tax, and the millage cut that would cancel the jump.

Open the envelope before you open a social feed. The sheet inside is usually an assessment notice. It names a parcel, a prior value, and a new value. It may mention a hearing date. It often does not say, in the first sentence, what your tax bill will be. People read the higher number and feel a tax increase. Sometimes that feeling is right. Sometimes the rate has not moved at all, and the only thing that changed is the value the rate sits on. Those are different events. One is a valuation. One is a levy. This page is for telling them apart with arithmetic you can do at the table.

The notice in the mail is not a tax hike vote. Nobody stood at a microphone that morning and moved to raise your rate. An assessor, or a mass-appraisal model the assessor stands behind, put a new number on the roll. The rate — mills, or an effective percent — is a separate decision, made by a board, a school district, a city, a county, sometimes several of them stacked. If the rate stays put and the taxable value rises, the bill rises. That is a valuation event showing up in dollars. If the value stays put and the rate rises, that is a rate event. Your notice may be only the first of those two. Do not let the envelope do the second job.

The boxes above are filled with an example Ryan Standley made up so you can check the math. Prior value $240,000.00. New value $312,000.00. Assessment ratio 100, which means we are treating those figures as the values that get taxed. An exemption of $25,000.00 comes off after that. The rate is 18.5 mills, and it does not change between the two years. On those inputs the old taxable value is $215,000.00 and the new taxable value is $287,000.00. The old annual tax is $3,977.50. The new annual tax is $5,309.50. The jump is $1,332.00 a year, which is 33.49%, or $111.00 a month. A millage of about 13.8589 on the new taxable value would have produced the old bill. That is a cut of about 4.6411 mills from the rate in the box. None of those figures is your house. They are a worked example you can ruin on purpose by typing over them.

Read the rest of this page if you want the words that sit under the boxes. Assessed value, taxable value, mills, effective rate, exemption, and assessment ratio get used as if they were the same noun. They are not. A seventh-grader can keep them straight if nobody rushes the sentence. The calculator does not know your state. It does not know whether your exemption is a homestead, a veteran’s exemption, a senior freeze, or a number you typed because you were curious. It will not file an appeal. It will show you what a rate does to two taxable numbers, and what would have to happen to the rate if someone wanted the new value to raise the same dollars as the old value.

What the envelope is actually saying

An assessment notice is a statement about value. Market value, appraised value, assessed value — the label changes by state, and sometimes by the line on the form. The idea is narrower than the politics around it. Someone estimated what the property is worth for tax purposes, or what fraction of that worth will be taxed. The notice exists so you can see the estimate before the roll is locked, and so you can argue if the estimate is wrong about your parcel. A leaking roof, a shared driveway, a sale next door that was not really comparable: those are valuation facts. They belong in an appeal if your county’s notice tells you an appeal exists. They do not, by themselves, tell you the tax rate.

A tax bill comes later, or on a different form. The bill multiplies a taxable value by one or more rates and then adds the special items your county stacks on: a flat fee, a drainage charge, a school bond that is a separate line, a credit that arrives after you apply. If you only have the assessment notice, you do not yet have the bill. You can still illustrate the bill if you know last year’s rate and you are willing to assume the rate holds. That assumption is the whole trick of this page. It answers: if nobody touches the rate, what does the new value do? It does not answer: what will the board do in September? Boards answer that on a different night, often after a hearing that has its own notice.

Hold the two papers apart even when they arrive in the same week. One paper says the parcel moved from one value to another. The other paper, when it exists, says the jurisdictions will charge a rate. Mixing them is how a valuation gets described as a vote the public never held. It is also how a real rate increase gets described as “just the assessor.” Both mistakes help somebody. Neither mistake helps you read the mail. If the notice in your hand has only values on it, say that out loud. Then decide whether you need the rate from last year’s bill, from a truth-in-taxation worksheet, or from the county’s rate sheet, before you let a percentage scare you.

Taxable value is what the rate touches

The rate does not always touch the big number in the headline. Many notices print a market value or an appraised value, then an assessed value, then a taxable value after exemptions. The calculator asks for the value you are holding, an assessment ratio, and an exemption in dollars. Taxable value here means: the number you typed, times the ratio divided by 100, minus the exemption, and never below zero. If the notice already did that work, leave the ratio at 100 and type the assessed figure, then put the exemption in its own box if it has not already been subtracted. Double-subtracting an exemption is the easiest way to invent a tax cut you do not have.

Why a ratio at all? Some states tax the full appraised value. The ratio is 100, and you can ignore the box. Some states tax a fraction — a constitutional percentage, a classification that treats a house differently from a store, a local rule that has been in the statute for decades. If your notice says the assessed value is forty percent of market, you can type the market number and 40 in the ratio, or type the assessed number and leave the ratio at 100. Do one of those, not both. The page cannot see your form. It can only multiply what you give it.

In the filled-in example the ratio stays at 100. $240,000.00 minus an exemption of $25,000.00 is $215,000.00. $312,000.00 minus the same exemption is $287,000.00. Notice what the exemption did. It did not cut the jump in value. The value still rose by $72,000.00. The exemption cut both years by the same dollar amount, so the taxable jump is the same $72,000.00 as the raw jump. A flat exemption softens the bill. It does not, by itself, soften the percentage change in the bill, and it can make the percentage look larger because the base is smaller. That is not a trick of the assessor. It is how subtraction works. If your exemption itself changed — a new homestead, a lost homestead, a cap that moved — type the exemption that belongs to each year only if they match. This page uses one exemption for both years. If yours changed, run the calculator twice and compare the annual taxes by hand.

Mills are a dollar unit, not a mood

A mill is one dollar of tax per one thousand dollars of taxable value. Ten mills on a taxable value of $100,000 is $1,000 a year. You can do that on a napkin: taxable value, divide by 1,000, multiply by the mills. The calculator does the same thing and then rounds to the cent, because tax bills are collected in cents, not in a long tail of fractions. If your notice prints an effective tax rate as a percent instead of mills, switch the toggle. An effective rate of 1% is the same arithmetic as 10 mills. One percent of $100,000 is also $1,000. Use the unit your paper uses. Do not feed mills into the percent box. Ten mills typed as “10%” would invent a bill ten times too big.

Rates stack. A county rate, a city rate, a school rate, a fire district, a library, a bond that was sold years ago and is still being paid. Your bill is often the sum. If you want the whole jump, add the mills first, or type the effective rate that already includes them, and run the page once. If you want to see which piece of government is the heavy one, run it once per rate and keep a tally. The page will not fetch the stack for you. Last year’s tax bill is the honest source for the stack you actually paid. A campaign mailer that quotes one district’s rate and calls it “your taxes” is leaving pieces off the table. Put the pieces back before you believe the percentage.

The rate in the example is 18.5 mills, held still on purpose. Stillness is the point. We are asking what the valuation does if the political decision about the rate is “same as last year.” Real life is messier. A board can lower the rate and you can still pay more, if the value rose faster than the rate fell. A board can raise the rate and you can pay less, if the value fell harder. The calculator’s last lines exist for that comparison. They answer a narrow question: what rate, on the new taxable value, would raise the same annual dollars as the old taxable value raised at the old rate? If your board’s proposed rate is above that number, the bill rises even after they “cut” something. If it is below that number, the bill falls even though the value rose. The envelope cannot tell you which of those nights you are living through. The rate sheet can.

Walk the example without squinting

Start with the old year. Value $240,000.00. Ratio 100 percent, so the assessed figure is the same $240,000.00. Exemption $25,000.00. Taxable value $215,000.00. Mills 18.5. Divide $215,000.00 by 1,000 and you get 215. Multiply by 18.5 and you get $3,977.50 for the year. That is the old bill under the assumption that 18.5 mills is the whole rate and that nothing else — no flat fee, no credit, no special assessment charged by the front foot — sits on the parcel. If your real bill has those extras, they will not appear here unless you fold them into the rate, which you should only do if they really do scale with value. A flat stormwater fee does not scale with value. Leave it out of the mills and add it in your head if you need the full envelope.

Now the new year, same rate, same exemption, same ratio. Value $312,000.00. Taxable value $287,000.00. Divide by 1,000 and you get 287. Multiply by 18.5 and you get $5,309.50. Subtract the old bill. The difference is $1,332.00. Divide that difference by the old bill and you get 33.49%. Divide the dollar difference by 12 and you get $111.00 a month. Monthly is not how most property taxes are billed. Many places bill twice a year, or once, or through an escrow account that already smooths the year into a mortgage payment. Monthly is here because a household budget is monthly. It is the jump expressed in the unit people use for groceries and the electric bill. It is still the same $1,332.00. Twelve times $111.00 comes back to the annual jump, within a cent of rounding.

The neutralizing line is the one people skip, and it is the one that keeps the valuation from being mistaken for a vote. We ask what millage, charged on $287,000.00, produces $3,977.50. That is old tax times 1,000, divided by the new taxable value. The result is about 13.8589 mills. The rate in the box is 18.5. The difference is about 4.6411 mills. In plain words: the rate would have to fall by that many mills to leave the annual tax sitting on $3,977.50 even though the taxable value rose. If a board advertises a cut smaller than that, the bill still goes up. If the board does nothing, the whole $1,332.00 is the valuation, not a new levy. Say it that way at the hearing if it is true. Do not say the assessor raised your taxes if what the assessor raised was the value. Do not say the board raised your taxes if the board left the rate alone and the value did the work. Precision is not a favor to officials. It is how you avoid arguing with the wrong document.

When the percentage looks wild

A small old bill makes a large percentage. If last year’s taxable value was almost entirely covered by exemptions, the old tax might be nearly nothing. A new building, a lost exemption, or a value that finally clears the exemption can make the percent change look like a siren. Look at the dollars beside the percent. A jump from $40 to $400 is 900 percent and also $360. Both numbers are true. One of them belongs in a headline. The other belongs in the checkbook. This page prints both so you do not have to pick a mood. If the old bill is exactly zero and the new bill is not, the percent is left blank. You cannot divide by zero and get a grown-up answer. The dollars still show.

The other wild case is a value that falls. Type a new value below the prior value and the delta turns negative. That is a tax cut under a frozen rate, not a moral victory and not a broken calculator. The neutralizing rate then sits above the rate you typed: the rate could rise some distance and still collect the old dollars. Officials sometimes do exactly that after a broad decline, because the budget was built on the old dollars. Whether they may do it, and whether they must advertise it, is a state rule. This page will not recite that rule. It will show you the rate that holds the old bill still, so you can compare it with whatever number the board actually posts.

What people argue about, and what is just multiplication

There is a real argument about whether the new value is fair. Comparable sales, condition, a commercial property valued like a different kind of business, a neighborhood that was trended up because other neighborhoods sold high. That argument is about the input. This page takes the input as given and multiplies. Winning the valuation argument changes the new value. You then type the value you think is right, or the value the board of review actually set, and you see the dollars move. Until that happens, the notice’s value is the value. Anger at the model does not change the product of value and rate.

There is a separate argument about whether the rate should fall when values rise. Some states require a rollback so that a reassessment does not, by itself, become a windfall. Some states require the windfall to be advertised and voted. Some states leave it to the annual budget hearing, where the rate is adopted in a line most people never see. Those are legal designs. They are not encoded here. If you want to know whether your board is allowed to keep the windfall, read the notice that proposes the rate, or ask the clerk for the worksheet that shows last year’s rate and this year’s proposed rate side by side. Then come back and type both rates if you want to see both bills. The page is a scratch pad. The statute is the statute. Ryan Standley is not your assessor and not your lawyer.

A ratio that is not 100

Suppose the notice prints a market value and, in smaller type, says residential property is assessed at a fraction. Type the market values in the two value boxes and type that fraction in the ratio box. The exemption still comes off after the fraction, which is the usual order: classify or assess first, then subtract the exemption the statute allows. If your county subtracts in a different order, the page will not match the bill to the dollar. You will still see the shape of the jump. Shape is what the envelope is hiding when it leads with market value and hopes you multiply the rate by the wrong line.

Classification matters as much as the ratio, and this page has no classification switch. A house, a farm, a store, and a vacant lot can sit at different ratios or different rates in the same county. If you own two of those, run the calculator twice. Do not average them into one sentimental number. The treasurer will not average them. A data center, a warehouse, and a bungalow can also sit under different abatement deals. Abatement is a different tool on this shelf. If the value was waived, the jump you feel may be sitting on someone else’s parcel, or the jump you do not feel may be a waiver with an expiration date. Do not use this page to celebrate a low bill until you know whether the low bill is a value, a rate, an exemption, or a temporary hole in the roll.

Caps and freezes are the other hole. Some places limit how fast the taxable value can rise even when the market value sprints. The notice may show both a high market number and a lower taxable number that is the one being taxed this year. Type the taxable numbers, ratio 100, exemption already removed or still to remove — pick one and be consistent. If you type the uncapped market value, you will illustrate a bill you are not being sent. That illustration can still be useful. It is the bill waiting if the cap expires, the ownership changes, or the statute sunsets. Label it that way in your own notes. The calculator will not label it for you. It multiplies the boxes.

How to use the result without making a speech you cannot support

If you speak at a hearing, take the notice, last year’s bill, and this scratch pad. Say which rate you assumed. Say that a frozen rate produces the dollar change on the page. Ask what rate is actually proposed. Ask whether any exemption on your account changed. Ask whether the value is market, assessed, or taxable. Those four questions survive contact with a clerk. A speech that begins “they raised taxes 30 percent” does not survive contact with a clerk if the rate did not move and you rounded the percent from memory. Bring the dollars. The dollars are harder to wave away, and they are what leave your account.

If you are deciding whether to appeal the value, ignore the neutralizing millage for a moment and look at the new value itself. The appeal asks whether the value is too high, not whether you wish the rate were lower. Evidence is sales, condition, and the definition your state uses. A calculator printout is not evidence of value. It is evidence that you understand the bill that follows from the value. Use it to decide whether the fight is worth the evening. A small dollar jump on a correct value is a hard appeal. A large dollar jump on a value that ignores a fire, a flood, or a sale you can document is a different evening. This page will not tell you which evening you have. You have the house. The page has arithmetic.

If you are a reporter, a board member, or a neighbor trying to explain a reassessment without joining a team, keep the sentence short. The value moved. The rate on this scratch pad did not. The bill moved by this many dollars. The rate would have to fall by this many mills to hold the bill still. Then go get the real proposed rate and replace the assumption. Notice Nearby can carry the hearing notice when someone pays to place it on this register. The calculator does not place anything, does not certify anything, and does not stand in for the newspaper a statute might still name. It is a desk tool for the person holding the envelope.

The figures in the boxes are an example, not your assessment and not your county’s rate. Ryan Standley wrote this page as Publisher / Authorized Officer of Notice Nearby. Notice Nearby is a paid public-notice register operated by Record of Sale, LLC, an Oregon limited liability company. This is an educational illustration. It is not a tax bill, not an appraisal, not a levy certification, not official debt math, and not legal, tax, or financial advice. Nothing here is Legal Publication, and a calculator does not satisfy a newspaper statute or any other notice statute.