The short answer: the letter is not a bill — it is a 30-day clock. If you, an immediate family member, or a 12-month tenant actually lives there, file the proof within your letter's 30-day window — and no later than September 18 — and you owe nothing. If it is truly a second home, three legal exits exist. Deadlines: September 18, 2026 (homes/condos), September 18, 2026 (co-ops).
Since late July, the Department of Finance has been mailing notices to owners of homes it believes are not a primary residence — the first formal step of New York City's new pied-à-terre tax. All notices are due to mail by August 30, 2026. On the DOF roll behind those letters, 24,173 properties citywide test over the surcharge thresholds. If one of these letters is in your mailbox, here is exactly what it means and what to do — in order, with the deadlines that matter.
First: what the letter is, and what it is not
The notice is not a bill. It means DOF's records show your property as a non-primary residence with a market value over the surcharge threshold — $1,000,000 of DOF market value for condos and co-ops, $5,000,000 for 1–3-family houses. It is the city telling you what it intends to assess unless you respond. Three groups get this letter: owners who genuinely owe the surcharge, owners who qualify for an exemption but must claim it, and owners caught by bad data — a stale mailing address, a co-op valuation surprise, an LLC the statute looks through. The response path is different for each, so the first job is figuring out which one you are.
The three deadlines
| Deadline | What it is | Who it applies to |
|---|---|---|
| The date printed on YOUR letter | The deadline for your notice response (the 30-day rebuttal with primary-residence proof). ⚠️ It does NOT extend the exemption-application deadline: if your letter's date falls after September 18, the application is still due September 18 — DOF has published no guidance treating a timely notice response as preserving exemption rights past that date. When in doubt, file both by September 18. | Everyone who received a notice |
| September 18, 2026 | DOF's published surcharge-exemption application deadline | Residential homes and condos |
| September 18, 2026 | DOF's published surcharge-exemption application deadline | Co-op units |
The 30-day clock. Under DOF's final rules (adopted July 14, 2026), once a notice lands you have 30 days to document that the home is a primary residence. Thirty days is short — tax professionals note that proving residency in a traditional New York audit can take the better part of a year. And if your notice was mailed to the pied-à-terre itself while you're away, the clock may run regardless. Don't wait to open mail.
Step by step: your next 30 days
① Read the date on your letter
The extended deadline is September 18, 2026 for all property types. Put it in your calendar today, with a reminder a week out. If your letter's 30-day date lands after September 18, treat September 18 as your real deadline anyway — the later date covers only the notice response, not the exemption application.
② Confirm what DOF thinks your home is worth
The surcharge is tested against your DOF market value — the "Market Value" line on your Notice of Property Value, not your assessed value and not your purchase price. Co-op values come from DOF's fractional-share method (your shares' fraction of the building's total value), which surprises shareholders on the high side. We'll pull your official number free, usually within the hour — that tells you whether you're arguing about residency, about value, or about nothing.
③ If the home IS your primary residence: rebut, with the right documents
DOF's rules specify the acceptable proof: your most recent state or federal income tax return showing the address — or a combination of two documents, such as a New York State driver's license or non-driver ID, a voter identification card, or other documentation DOF deems acceptable. Assemble these now and respond within your letter's window. A unit occupied more than half the year by an immediate family member (spouse, child, sibling, parent, grandparent, grandchild) as their primary residence also qualifies — document their occupancy the same way.
④ If it truly is a second home: run the numbers before you pay
You have three legal ways out, and each has lead time: a bona fide 12-month arm's-length lease to a tenant who makes it their primary residence (eliminates the surcharge entirely), family occupancy as above, or a sale. Which one wins depends on your exact DOF value and what your unit would rent or sell for — that's the math our free review does. See also: the keep-rent-sell framework.
⑤ Whatever you do, don't ignore it
An unanswered notice becomes a surcharge billed as assessed, enforced like property tax — interest accrues and liens follow. And don't get creative: DOF's rules impose a penalty of 50% of the surcharge for false primary-residence documentation, and up to 300% of an understatement (capped at 50% of the surcharge) for misleading valuation submissions.
"My name is on the city's list"
Alongside the mailings, the city published a roll of properties it classifies as non-primary — names and addresses — and press coverage has been aggressive. Being on the list follows the same logic as the letter: it reflects DOF's classification, not a final determination. The response paths above are unchanged. You can see every building on the roll in our searchable database, built from the same DOF file.
Questions owners ask
What does a NYC pied-à-terre tax notice mean?
The DOF notice means the city's records show your property as a non-primary residence with a market value over the surcharge threshold ($1M DOF market value for condos and co-ops; $5M for 1–3-family houses). It is not a bill — it is the classification the city will assess unless you respond. Owners have 30 days from the notice to document primary residence, and DOF's published exemption-application deadlines are September 18, 2026 (all property types).
What documents prove primary residence for the NYC pied-à-terre tax?
Under DOF's final rules: your most recent state or federal income tax return showing the property's address, or a combination of two documents such as a New York State driver's license or non-driver ID and a voter identification card (or other documentation DOF deems acceptable). The rebuttal must be filed within 30 days of the notice.
What happens if I ignore the DOF pied-à-terre notice?
The surcharge is billed as assessed and enforced like real property tax — interest accrues and lien enforcement follows. Filing false documentation draws a penalty of 50% of the surcharge; misleading valuation submissions can be penalized up to 300% of the understatement, capped at 50% of the surcharge.
I got a notice but I rent my apartment out — do I owe?
A unit under a bona fide arm's-length lease of at least 12 months to a tenant who uses it as their primary residence is exempt — but the exemption must be claimed and documented, not assumed. A unit that is merely listed for rent, or rented short-term or seasonally, remains taxable.
Got a letter? Know your number first.
Free emailed report: your unit's official DOF market value, whether the surcharge actually applies, and your realistic options before the deadline. Usually within the hour.
Check My Unit — FreeIf your letter is wrong
Wrong value, wrong classification, or a unit that shouldn't be on the roll at all — you have more room than the 30-day window suggests: DOF's supplemental roll is open to correction through December 2026, and separate challenge routes exist for valuation. We've laid out every channel, with honest notes on which are still being clarified, on the appeals page.
Disclaimer. This page is educational information from Conquest, a licensed New York real estate brokerage. It is not legal, tax, or accounting advice, and no advisory relationship is created by reading it. Deadlines and figures reflect DOF's published rules and roll as of the "last updated" date above.