State Guide

How to Appeal Your Property Taxes in Washington, DC (2026 Guide)

Published July 30, 2026

If you own a home in the District, the Office of Tax and Revenue mails you a Notice of Proposed Real Property Assessment — its estimate of what your home would sell for — and that number drives your tax bill. DC gives you a short, fixed window to challenge it, and unlike most states there are no counties to sort through: one assessing jurisdiction, one deadline, one set of rules.

The DC deadline: April 1

Your first-level administrative review petition is due to the Office of Tax and Revenue (OTR) on or before April 1 — DC Code §47-825.01a(d)(1), which sets the petition "on or before April 1 of the immediately preceding tax year." The District's tax year runs October 1 through September 30, and your assessment notice goes out no later than March 1 (§47-824), so in practice the notice lands and you have about a month to act.

If April 1 falls on a weekend, OTR moves the deadline to the next business day. April 1, 2027 is a Thursday, so that year's deadline stands as written; April 1, 2028 is a Saturday, which pushes that year's deadline to Monday, April 3, 2028.

The order matters. DC runs a three-rung ladder, and you cannot skip the first one:

1. OTR first-level review — due April 1. An assessor discusses the basis of your assessment; the review can be in person, by phone, or in writing.
2. Real Property Tax Appeals Commission (RPTAC) — within 45 calendar days of the date on your Notification of First-Level Decision (§47-825.01a(e)(1)(A)). The clock runs from the date on the notice, not the day you receive it. RPTAC will not accept an appeal unless a first-level administrative appeal was filed with OTR first.
3. DC Superior Court — by September 30 of the tax year at issue (§47-825.01a(g)(1)), and only after having appealed to the Commission in good faith. Note that this is the last day of the year under appeal — for a petition filed April 1, 2026 (which contests tax year 2027), that's September 30, 2027, roughly eighteen months later. You must also pay the tax, penalties, and interest first (§47-3303, which reaches real property because §47-825.01a(g)(1) applies it "in the same manner and to the same extent").

How DC assesses your home

DC assesses at 100% of estimated market value. DC Code §47-820(a)(3) is direct about it: "The assessed value for all real property shall be the estimated market value of such property as of the valuation date." There is no fractional ratio to back out — unlike states that assess at 40% or 20% of market and force you to gross the number back up, the figure on your DC notice is meant to be the sale price. That makes the comparison clean: recent sales of similar homes go straight up against the assessed value with no conversion step.

Class differences in DC (§47-812) are rate-side — they change the rate applied to your value, not the fraction of value you're assessed on. So the whole appeal is one question: what would this home actually sell for?

Category	District of Columbia
Assessment basis	100% of estimated market value (§47-820(a)(3)) — no conversion
Appeal deadline	April 1 (next business day if a weekend) — §47-825.01a(d)(1)
Where you file first	Office of Tax and Revenue (administrative review)
Second rung	RPTAC — 45 days from the first-level decision
Assessment cap	10% homestead cap on taxable assessment (§47-864)
Can the board raise your value?	Yes — if it finds you more than 5% off market (§47-825.01a(e)(4)(C)(ii))

The 10% homestead cap — and why it can mute your savings

DC layers a real growth cap on top of full-market assessment. The owner-occupant residential tax credit (§47-864) multiplies the prior year's taxable assessment by 110% — a 10% annual ceiling on how fast your taxable value can climb (§47-864(b)(1)(B)). In your first capped year the arithmetic starts differently: it runs off the prior year's assessed value less the current homestead deduction, then applies the same 110% (§47-864(b)(1)(A)). If you also receive the senior/disabled relief under §47-863, the multiplier drops to 102%.

Two details decide whether the cap matters to you:

• It only applies to homesteads. §47-864(a) limits the credit to property receiving the homestead deduction under §47-850 or §47-850.01. A rental or second home gets no cap — and a value reduction cuts that bill directly.
• It resets when you buy. Under §47-864(c)(1)(A)(i), the credit does not apply where the property "was transferred for consideration to a new owner." A recent buyer is exposed to the full market assessment — and gets the full, undamped benefit of winning an appeal.

Here's the part that trips people up: the cap does not lower the assessed value on the tax roll. Your full market assessment stays on the record and the bill is computed on the lower capped taxable figure. So if you've held a homestead for years, your taxable value may already sit well below what the home would fetch — and a comparable-sales win mainly resets your future baseline. A current-year cut requires your proven market value to fall below your existing capped taxable amount.

(Don't confuse the cap with the flat homestead deduction in §47-850 — a straight subtraction from taxable assessment. Its statutory base is $67,500, but that figure is indexed annually for cost of living and the number that actually comes off your assessment is far larger: $91,950 for tax year 2026. It's a deduction, not a growth cap. OTR republishes the amount each autumn when the new tax year begins, so check the current figure rather than the statutory base.)

DC can raise your assessment — file carefully

This is the District's sharpest edge, and it is written into the statute. §47-825.01a(e)(4)(C)(ii): "The Commission shall raise or lower the estimated market value of any real property that it finds to be more than 5% above or below the estimated market value for any assessment appealed by an owner." That last clause is the risk — bringing your own case is exactly what puts the value in front of the Commission, and if it concludes you are under-assessed by more than 5%, raising you is not discretionary.

You also carry the burden. §47-825.01a(e)(4)(C)(iii): "The assessment shall be presumed correct. The owner shall demonstrate by a preponderance of the evidence that the assessment of the real property does not represent the estimated market value or that the classification of the real property is erroneous." That second half is a distinct ground worth knowing: if DC has your home in the wrong class, that is its own basis for appeal, separate from arguing the number is too high. And at the top rung, §47-3303 lets the Superior Court "affirm, cancel, reduce, or increase the assessment."

None of that means don't appeal. It means don't appeal on a hunch. File when your comparable sales clearly and cleanly support a lower value.

Building your case

Because the entire question is estimated market value, the evidence that wins is recent, nearby comparable sales — homes genuinely like yours in size, age, condition, and square footage, that actually closed. Listing prices and online automated estimates aren't sales, and a presumption of correctness doesn't yield to "this feels high." In a rowhouse city, be especially careful about block-to-block variation, lot size, and whether a comp has been renovated: three or four tight, well-adjusted comps beat a dozen loose ones.

Get your case built

PROppeal pulls licensed comparable sales for your DC address, compares them against your assessment on DC's 100%-of-market basis with no conversion step, factors in whether the §47-864 homestead cap changes what a win is actually worth to you, and gives you a straight answer on whether your assessment is out of line — well before April 1.

Property tax rules and deadlines vary by jurisdiction and can change — verify with your county before relying on this.