Provisional vs. Non-Provisional Patent — Which to File First (2026)

A provisional patent application is not a patent. It never will be — it expires on its own after exactly 12 months and is never examined. That surprises most first-time inventors. But once you understand what a provisional actually does, it becomes one of the cheapest, smartest moves in a filing strategy.

Here is the difference, when to use each, and the single deadline that ruins more inventions than any other.

The one-sentence difference

A provisional application locks in your filing date and gives you 12 months of "patent pending" status — but it is never reviewed by an examiner and automatically goes abandoned after a year. A non-provisional application is the real filing: it enters examination, and it is the only one of the two that can ever mature into a granted patent.

Think of the provisional as a placeholder and the non-provisional as the actual claim.

What a provisional actually buys you

• A priority date. This is the big one. Your filing date is your place in line, and US patents go to the first inventor to file. A provisional plants that flag cheaply and immediately.
• 12 months of "patent pending." You can mark your product, pitch investors, and talk to manufacturers with real (if temporary) protection in place.
• Time and flexibility. You get a year to build, test, refine the invention, and decide whether it is worth the cost of a full filing — without losing your date.
• Lower cost and less formality. A provisional does not require formal patent claims, an inventor's oath, or an information disclosure statement. The USPTO filing fee is a fraction of a full application's.

What it does not buy you: examination, enforceable rights, or any patent at all unless you follow through.

The 12-month rule that ends inventions

This is the part people miss. You must file a non-provisional application (or an international PCT application) within 12 months of your provisional filing date, claiming priority back to it. The deadline is effectively non-extendable.

Miss it, and two things happen:

1. Your priority date is gone. The provisional is abandoned and cannot be revived as a priority anchor.
2. Anything you disclosed publicly in the meantime — the trade-show demo, the crowdfunding page, the published paper — can now be used as prior art against your own application.

A provisional is a 12-month fuse. Light it only when you are prepared to file the real thing before it burns down.

What each actually costs in 2026

These are the current USPTO fees (effective January 19, 2025). They scale with entity size — most startups and solo inventors qualify as small (~60% off) or micro (~80% off) entities.

Fee (USPTO)	Large entity	Small entity	Micro entity
Provisional filing	$325	$130	$65
Non-provisional (filing + search + examination)	$2,000	$800	$400
Issue fee (after allowance)	$1,290	$516	$258

Those are government fees only. If a patent attorney drafts the application, professional fees typically run several thousand dollars more — and that is usually where most of a patent's real cost lives. See the full breakdown in our patent cost guide.

When to file a provisional first

• You are still iterating. The product is not final and you want a date now while you keep building.
• You need "patent pending" for a moment that is coming up — a launch, a demo, a raise, a pitch.
• You are about to disclose publicly and need to beat the clock (a public disclosure can destroy patentability in most of the world).
• Cash is tight. A provisional defers the bigger spend by up to a year.

There is also a quiet bonus: the 20-year term runs from your non-provisional filing date, not the provisional. So filing a provisional first can add up to 12 months of total protection — 12 months of provisional pendency, then 20 years from the non-provisional.

When to skip straight to a non-provisional

• The invention is fully baked and you are ready to prosecute it now.
• You want examination to start sooner — every month in provisional limbo is a month the examiner has not looked at it.
• Your disclosure is thin. If you cannot write a complete, enabling description yet, a rushed provisional may not actually protect anything (see below).

The mistake that wastes a provisional

A provisional only protects what it actually describes. US law (35 U.S.C. § 112) requires the disclosure to enable the invention — to teach someone skilled in the field how to make and use it. A two-page "I will add the details later" provisional that gestures at an idea without explaining it buys you almost nothing: when you finally file the non-provisional, your claims can only rely on what the provisional genuinely supported.

The fix is simple. Treat the provisional like the real specification. Describe the invention as completely as you can — drawings, variations, the whole mechanism — even though you are not paying for formal claims yet. A thorough provisional is worth ten rushed ones.

Bottom line

File a provisional first when you want a cheap, fast priority date and a year of breathing room — and you can write a complete description today. Go straight to non-provisional when the invention is finished and you want the clock on examination running. Either way, the priority date is the prize, and the 12-month deadline is the trap.

For a side-by-side of the two filings, see our provisional vs. non-provisional guide. New to all of this? Start with what a patent actually is.