Guide · Decide

The Section 15 Declaration of Incontestability: is it worth filing?

Somewhere around your mark's fifth birthday, a filing service will offer to make your trademark "incontestable" — usually in the same breath as your Section 8, usually for a few hundred dollars on top of the government fee. It is a real thing with real benefits. It is also entirely optional, it does not keep your registration alive, and for some owners it is not worth the money. Here is the honest version.

Published 2026-09-16 · fees verified vs USPTO

What a Section 15 declaration actually does

A Section 15 Declaration of Incontestability (15 U.S.C. §1065) is a sworn statement that you have used your registered mark continuously in commerce for five consecutive years, and that nobody has successfully challenged your right to it. File it, the USPTO accepts it, and your registration changes legal weight.

Before Section 15, your registration certificate is prima facie evidence that the mark is valid, that you own it, and that you have the exclusive right to use it. That is a presumption — a head start in a fight, but one the other side is free to argue against. After Section 15, on the goods and services covered by the declaration, that evidence becomes conclusive. The other side no longer gets to litigate whether your mark deserved registration at all. They have to attack you on one of a short list of statutory grounds instead.

In practical terms: incontestability doesn't make your mark stronger in the marketplace, and it doesn't automatically win a likelihood-of-confusion argument. It takes an entire category of defense — your mark was never protectable in the first place — off the table.

The real benefit: it kills the "merely descriptive" attack

If you take one thing from this page, take this one. The single most common way a defendant fights back against a trademark claim is to argue that the mark is merely descriptive — that it just describes the product rather than identifying its source, and therefore should never have been registered. Incontestability forecloses that argument completely.

That matters enormously if your mark sits anywhere near the descriptive end of the spectrum. Marks built from real words about what you sell, marks registered on a showing of acquired distinctiveness under Section 2(f), marks that a skeptical lawyer would call "suggestive at best" — those are precisely the registrations that benefit most. Five years of use plus a $200-ish filing converts a permanently arguable registration into one whose validity is settled.

Rule of thumb: the more your mark sounds like a description of your goods, the more Section 15 is worth filing. A coined, fanciful mark that nobody could plausibly call descriptive gains the least from it — the attack it blocks was never going to land anyway.

There is a second, quieter benefit. Incontestable status is useful before anyone files a lawsuit. It makes a cease-and-desist letter harder to shrug off, it strengthens your hand in a domain or platform dispute, and it removes a talking point from the other side's response. Most trademark disputes are resolved in letters, not courtrooms, and leverage in letters is worth something.

What incontestability does not protect you from

"Incontestable" is a badly chosen word. Your registration can still be contested — just on narrower grounds. The statute preserves a list of defenses and challenges that survive intact:

Genericness. If the public comes to use your mark as the ordinary name of the product, it can be cancelled at any time, incontestable or not. Escalator and thermos both died this way.
Abandonment. Stop using the mark with intent not to resume, and you can lose it regardless of status.
Fraud. Obtaining the registration — or the incontestability itself — through a false statement voids the benefit.
Functionality. A feature that is functional cannot be locked up as trade dress.
Fair use. Someone using descriptive words descriptively and in good faith, rather than as a brand, still has a defense.
Prior users in a limited area. A business that was using the mark before you, without knowledge of you, keeps its rights in its own territory.
Misrepresentation of source, prior registration, antitrust misuse, and equitable defenses such as laches or acquiescence.

So Section 15 is armor, not immunity. It is also worth being precise about what it is not: it is not a renewal, it does not extend your registration by a single day, and it does not reduce or replace anything you owe the USPTO later.

The dangerous misunderstanding: some owners file a Section 15, see "incontestable" on their record, and conclude their trademark is now permanent. It is not. If you miss your Section 8 or your combined Section 8 & 9, an incontestable registration is cancelled exactly like any other one — and a registration cancelled for missed maintenance cannot be revived. Maintenance deadlines are the thing that actually keeps your mark alive.

Are you eligible? Five conditions

Eligibility is mechanical. You can file a Section 15 if all of the following are true:

Your mark is registered on the Principal Register. Supplemental Register registrations are not eligible, ever — that is one of the real costs of ending up on the Supplemental Register.
You have used the mark continuously in commerce for five consecutive years after the registration date, and you are still using it now.
There has been no final decision against you on your ownership of the mark or your right to register or keep it registered.
There is no proceeding pending — no opposition, cancellation, or court case involving those rights — on the day you file.
The mark has not become generic for the goods or services you are claiming.

The five years must be five years of real, continuous commercial use — not five years of owning a certificate. If you paused the business for two years in the middle, the clock effectively restarts, and swearing otherwise is the kind of false statement that can sink both the declaration and the registration behind it. Claim only the goods and services you can honestly support; you can file a Section 15 covering some classes and not others.

Madrid Protocol / §66(a) owners: your US registration is maintained under Section 71, not Section 8, and your international registration is renewed separately through WIPO — not at the USPTO. Incontestability is still available to you once you meet the five-year use requirement; the Section 15 declaration is simply filed on its own rather than bundled with a Section 8.

Timing: this is not a deadline like Section 8

Here is where Section 15 differs from everything else in trademark maintenance, and where a lot of urgency-flavored marketing is misleading.

Your Section 8 Declaration of Use is a hard deadline: due between the fifth and sixth anniversary of registration, with a six-month grace period and a surcharge after that, and cancellation with no way back if you blow through it. Your combined Section 8 & 9 renewal is due at the tenth anniversary and every ten years after that, on the same unforgiving terms.

Section 15 has no such cliff. The declaration is filed within one year after the close of a qualifying five-year period of continuous use — and because the statute refers to any such five-year period, an owner who keeps using the mark can simply rely on a later window. Missing your first opportunity costs you nothing but time. There is no grace-period surcharge, no penalty, and no loss of rights for never filing one at all.

That is why most owners file it alongside the Section 8: not because the two are legally linked, but because the eligibility windows overlap and it saves a trip. If you are working through your five-to-six-year window right now, read our step-by-step Section 8 walkthrough first — that one actually has a deadline attached.

What it costs, and how to file it

The USPTO fee for a Section 15 declaration is currently $200 per class, and the Section 8 Declaration of Use it is usually filed with is currently $325 per class — verify both on the official USPTO fee schedule before you file, since fees change. A one-class registration filing both together is therefore a few hundred dollars in government fees, total.

Mechanically, it is one of the easier things you will do at the USPTO. The forms live on the USPTO's trademark maintenance page, and there is a single Combined Declaration of Use and Incontestability under Sections 8 & 15 form that handles both at once. You provide the same specimen and use information the Section 8 requires, add the five-year continuous-use statements, sign under oath, and pay both fees in one transaction. No specimen beyond the Section 8 one is needed. For a clean registration there is nothing here that requires a lawyer.

Where a filing service or attorney earns their fee is complication — a changed owner, a specimen problem, goods you need to delete, an office action, or a pending dispute that makes you ineligible. For everyone else, the honest math is in our breakdown of what renewal actually costs and our filing options page, which lists the do-it-yourself path first, at cost.

So — is it worth filing?

Our honest read, by situation:

File it

Your mark is descriptive, suggestive, or registered under Section 2(f) with acquired distinctiveness. You expect to enforce — you sell in a crowded category, you have already sent a takedown or a demand letter, or you have watched copycats appear. Your brand is the main asset of the business. In all of these, a couple hundred dollars to permanently remove the strongest attack on your registration is cheap insurance, and you are already filing a Section 8 anyway.

Skip it, or wait

Your mark is coined and fanciful, you are not enforcing against anyone, and the extra per-class fee is real money to you right now. Nothing bad happens if you never file, and nothing is lost if you file it five years from now instead. Multi-class registrations are where this gets expensive fastest — the fee is per class, so a four-class registration multiplies the decision.

Don't bother yet

You are under five years of use, you are on the Supplemental Register, or you have a live opposition or cancellation proceeding against you. In those cases you are not eligible, and no filing service can change that.

Whatever you decide, decide it on its own merits — and don't let an upsell distract you from the filing that is genuinely mandatory. Incontestability is a nice-to-have. The Section 8 and the combined Section 8 & 9 are the ones that keep your registration from disappearing.

Frequently asked questions

Is a Section 15 declaration required to keep my trademark?

No. It is entirely optional. Your registration is maintained by the Section 8 Declaration of Use between the fifth and sixth anniversary and the combined Section 8 & 9 renewal at year ten and every ten years after. Never filing a Section 15 has no effect on whether your registration survives.

Can I file Section 8 and Section 15 at the same time?

Yes, and most owners do. The USPTO offers a single Combined Declaration of Use and Incontestability under Sections 8 & 15. You submit one form with one specimen per class and pay both per-class fees together. They remain legally separate filings — the Section 8 has a hard deadline, the Section 15 does not.

What does incontestable actually mean if someone copies my brand?

It means the copier cannot defend themselves by arguing your mark should never have been registered — most importantly, that it is merely descriptive. Validity, ownership, and your exclusive right to use the mark become conclusive rather than presumed. They can still raise genericness, abandonment, fraud, fair use, functionality, prior limited-area use, and equitable defenses, and the court still decides likelihood of confusion on the facts.

I'm past my sixth anniversary — is it too late to file a Section 15?

Almost certainly not. Unlike the Section 8, the Section 15 has no fatal deadline: it is filed within a year of the close of a qualifying five-year period of continuous use, and an owner still using the mark can rely on a later five-year period. If your Section 8 is what you actually missed, that is the urgent problem — check your grace-period dates immediately.

Section 15 is optional. Your Section 8 isn't. Find out exactly when your mandatory maintenance filings are due — no account, no email: run your registration through the free deadline checker →. If the mark matters to your business, a $49/year independent watch tracks every status change and office action on the record, so nothing depends on one USPTO courtesy email reaching one inbox.

General information, not legal advice. RenewMark is an independent service and is not affiliated with the USPTO. Fees and rules change — confirm your specifics against the official record at tsdr.uspto.gov and uspto.gov before relying on anything here.