US Patent Filing &
Maintenance Fee Estimator

Based on over 20 years of expertise in the patent field, one of the most frequently misunderstood aspects of USPTO fee calculations is the treatment of Multiple Dependent Claims (MDCs). An MDC is a dependent claim that refers back to more than one preceding claim in the alternative — for example, "Claim 10: The device of any one of claims 1–9, wherein…". While this drafting technique conserves claim count on paper, the USPTO applies a specific rule that dramatically inflates the effective total-claim count for fee purposes.

The operative rule is this: each claim referred to by an MDC is counted as a separate claim. In the example above, Claim 10 does not count as 1 claim. It counts as 9 claims — one for each of the claims 1 through 9 it incorporates. If your application has 3 independent claims, 9 single dependent claims, and MDC "Claim 13" referring to claims 1–9, your effective total count for fee purposes is: 3 + 9 + 9 = 21, putting you one claim over the 20-claim threshold and triggering an excess-claim surcharge on top of the mandatory MDC surcharge.

The $925 MDC surcharge applies unconditionally the moment any multiple dependent claim appears in the application, regardless of whether you exceed the 20-claim threshold. For a Micro Entity, the equivalent surcharge is $185 — still a meaningful expense that surprises many first-time applicants. The practical lesson: draft MDCs only when the claim coverage benefit clearly outweighs the added fee burden. Many practitioners restructure claim sets to avoid MDCs entirely in cost-sensitive applications.

The initial filing fee is only the beginning of a patent's financial story. A granted utility patent requires maintenance fee payments at the 3.5-year, 7.5-year, and 11.5-year intervals to remain in force for the full 20-year term. For a large entity in 2026, these three payments total $13,460 — considerably more than the initial filing package. Combined with the issue fee and any prosecution costs, the true cost of a single U.S. patent from filing to expiration routinely exceeds $30,000–$50,000 when attorney fees are included.

Startups and individual inventors should rigorously evaluate the commercial potential of each patent before paying maintenance fees. The USPTO's small entity and micro entity discounts — 60% and 80% reductions respectively — can translate to tens of thousands of dollars in savings over a patent's lifetime. Careful entity-status management and timely payment planning should be integrated into every IP budget strategy. Many portfolio owners allow patents of declining commercial relevance to lapse at the 3.5-year or 7.5-year window rather than pay escalating maintenance fees.

The most cost-efficient patent strategies combine lean claim drafting, appropriate entity classification, and proactive portfolio management. Whether you are a solo inventor, an early-stage startup, or a mid-market technology company, a well-structured fee plan aligned to your commercialization timeline can dramatically reduce the total cost of IP protection. This estimator provides the quantitative foundation for those decisions, though we always recommend consulting a registered patent practitioner before making filing or maintenance decisions.

Professional IP intelligence tools for inventors, startups, and patent practitioners. USPTO-compliant fee data updated annually.