Loudoun County, Virginia Property Tax Appeal Guide for 2027

What deadline matters first

For 2027 planning, treat June 1, 2027 as the key outside deadline for filing with the Board of Equalization in Loudoun County. Loudoun’s local ordinance says a Board of Equalization application must be received by June 1 of the assessment year, and the county’s 2026 public guidance also used June 1 for BOE appeals. See Loudoun’s appeal guidance and Chapter 860.09.

The earlier administrative review with the Commissioner of the Revenue is expected to close around March 16, 2027, based on Loudoun’s recurring schedule and the verified policy snapshot. Because a 2027 assessment-cycle page was not found, check your 2027 notice before you file.

Loudoun annually assesses real estate at 100% of fair market value as of January 1. For tax year 2027, that target valuation date is January 1, 2027.

The most recently adopted countywide real property tax rate found for the FY 2027 budget was $0.805 per $100 of assessed value, which is about 0.00805 of assessed value before any separate town or special district charges. TaxSauce’s rounded effective tax-rate slot is 0.0081. Loudoun’s FY 2027 budget page states the adopted budget maintains that real property tax rate for tax year 2026. See the county’s FY 2027 budget process page.

For volume context, Loudoun’s 2026 Assessment Summary listed 152,729 total all-classes parcels, so even careful individual appeals happen inside a large annual assessment system. The county’s public reports page explains that annual reports are benchmarks and may not include later appeal changes. See Public Real Estate Reports and the 2026 Assessment Summary PDF.

The common value appeal

The most common homeowner issue is Loudoun’s official Market Value reason. This means you believe the county’s January 1, 2027 fair market value is too high when compared with valid sales of similar properties.

For a 2027 Market Value appeal, focus on sales from January 1, 2026 through December 31, 2026. Loudoun says the assessment is based on valid sales from the prior year, and sales from the last half of the prior year are often the best fair-market-value indicators when they are otherwise comparable. See Loudoun’s appeal guidance.

A good comparable is not just any sale in the county. Look for homes in the same neighborhood or close proximity, with similar age, living area, acreage, construction, condition, and amenities. Loudoun does not publish a fixed mileage rule or a hard maximum number of sales for residential appeals.

TaxSauce can screen within a practical 5-mile radius to help you start, but closer and more similar evidence is usually better than farther evidence. Sales after January 1, 2027 should generally be excluded because they are after the valuation date.

Other reasons you might appeal

Loudoun’s other official appeal reasons are Equity and Incorrect Property Data. These are different from Market Value, and it helps to keep the reason clear when you organize your evidence.

Equity means the assessment may not be uniform or equitable compared with similar nearby properties. In plain language, your house may be assessed higher than similar homes close by, even if recent sales are not the best evidence. For Equity, comparable assessed values can matter.

Incorrect Property Data means the county used wrong facts about your property. Examples include incorrect living area, acreage, condition, construction, or amenity information. Loudoun’s guidance tells owners to contact the appraiser if the assessment appears based on inaccurate property characteristics. See Appealing a Real Estate Assessment.

If your Notice of Assessment says something else changed

Your Notice of Assessment is the assessment letter showing the county’s value for your property. In Loudoun, the official local term is Annual Real Estate Assessment Notice. It is not the same thing as a tax bill. It tells you the assessed value and gives contact information for the appraiser assigned to your property. Loudoun explains that these notices provide the real property value as of January 1. See the county’s assessment appeal page.

If the notice shows a value change, read it before you gather evidence. Ask whether the change seems driven by market sales, property data, a construction update, acreage, condition, or another recorded feature.

If the notice suggests the county changed a fact about your home, compare it with your property record. Wrong square footage, finished area, acreage, condition, or amenities can support Incorrect Property Data. If the value rose but the facts are right, you may be looking at Market Value or Equity instead.

What evidence helps

For Market Value, start with valid comparable sales from January 1, 2026 through December 31, 2026. Loudoun asks taxpayers to use comparable property sale prices from the prior year and to include identifying information such as owner name and tax map or PIN when available. See Loudoun’s official guidance.

For a Board of Equalization filing, Loudoun guidance strongly encourages at least three sales comparables. Avoid non-arm’s-length sales, because county BOE guidance warns that those are a common pitfall. An arm’s-length sale is a normal open-market sale between unrelated parties, not a transfer between family members or another unusual transaction.

For Equity, evidence can include assessed values of similar properties in close proximity. For Incorrect Property Data, evidence can include photographs, contractor information, plats, easement documents, maps, floodplain or topography records, percolation limitations, and other documents showing the county record is wrong.

If you have a licensed appraisal, it is most useful when it is dated before the January 1, 2027 assessment date. Written or graphic evidence for the BOE should be submitted by the filing deadline or at least 15 business days before the scheduled hearing, whichever comes first, subject to BOE discretion.

What the board can and cannot decide

The Board of Equalization, often called the BOE, is separate from the Office of the Commissioner of the Revenue. Loudoun says the BOE reviews appeals and decides whether a property is assessed equitably when compared with similar properties and at fair market value. See Loudoun’s BOE appeal guidance.

The BOE can consider evidence from both sides at a hearing. You or your representative may explain why the assessment is inaccurate, and the county appraiser may explain the valuation.

The BOE is not the body that sets the countywide tax rate. Loudoun’s Board of Supervisors adopts the budget and tax rate. The BOE also does not make your tax payment deadline go away. Loudoun states that filing an assessment review does not guarantee a reduction or delay the tax due date. See the county’s appeal guidance and FY 2027 budget page.

If you disagree with a BOE decision, Loudoun says you may appeal to Circuit Court. That step often involves hiring an attorney.

How TaxSauce helps

TaxSauce helps you turn a confusing assessment notice into an organized review packet. We help separate Market Value, Equity, and Incorrect Property Data so your evidence matches the reason you are raising.

TaxSauce can help screen sales from the right time period, compare similar nearby homes, flag possible property-record issues, and organize photos or documents. We can also help you prepare materials for review before you decide whether to file.

You stay in control. You review the evidence, choose whether to submit, and decide whether to contact the Commissioner of the Revenue, file with the Board of Equalization, or speak with legal counsel for Circuit Court.