Under Federal Law, Which Type of Boat Must Have a Capacity Plate?
Contents
Last reviewed: October 3, 2026. This article is general information, not legal advice. Federal rules set the plate requirement, but overloading penalties come from state law, so check your state's boating statute.
If you're preparing for a boater safety exam or looking at a small boat to buy, the capacity plate is that little label near the helm with the maximum number of people, weight and horsepower. Here's exactly which boats federal law covers, and why the plate matters on the water.
Short answer: under federal law, monohull boats less than 20 feet long must display a capacity plate. Sailboats, canoes, kayaks and inflatable boats are excluded. The plate must show the maximum number of persons (in whole persons and in pounds), the maximum weight capacity, and the maximum horsepower, or the statement that the boat is not rated for a motor. It is the manufacturer's job to put the plate on, and it must be visible to the operator.
Why boats under 20 feet
Small monohull boats are the ones most easily swamped or capsized by too many people or too much weight. Larger boats, sailboats and paddle craft behave differently and are left out of this rule. Part 183 is a set of federal construction standards for recreational boats, and federal law at 46 U.S.C. § 4307 makes it unlawful to build or sell a recreational vessel that doesn't conform to the applicable standards. That's why the plate is already on a new boat when you buy it.
What the plate tells you
- Maximum persons. How many people the boat can safely carry, also shown as a total weight in pounds.
- Maximum weight capacity. The total weight of people, motor and gear combined. For outboard boats, 33 CFR 183.35 caps the figure at no more than one-fifth of the difference between the boat's maximum displacement and its own weight, which builds in a safety margin.
- Maximum horsepower. The largest motor the boat is rated for, or a statement that it isn't rated for a motor.
These figures are calculated for normal conditions. In rough water, strong wind or with an inexperienced crew, it's sensible to load well below them.
How the plate must be displayed
Under 33 CFR 183.25, the marking must be "permanently displayed in a legible manner where it is clearly visible to the operator when getting the boat underway." Under 33 CFR 183.27, it must withstand water, oil, salt spray, sun, heat, cold and normal wear, and be resistant to removal or alteration without leaving an obvious sign. Tampering with the plate is a red flag when you're buying a used boat.
Is overloading against the law?
The federal capacity regulation tells builders what to put on the plate. Whether you, the operator, can be ticketed for exceeding it is mostly a question of state law, and many states make it an offense. For example, Kansas law says "No person shall operate any vessel on any waters of this state carrying passengers or cargo beyond the safe passenger and cargo carrying capacity of the vessel as specified on the capacity plate" (K.S.A. 32-1126). Other states have similar rules, so check your state's boating handbook. Even where it isn't a separate offense, overloading can lead to a reckless or negligent operation charge if something goes wrong, and it may matter to your insurer.
Practical tips
- Count weight, not just heads. Coolers, fuel, fishing gear and a heavier motor all use up capacity.
- Spread the load evenly and keep people seated low in small boats.
- Don't fit a bigger motor than the plate allows. It changes how the boat handles and may breach state law and your insurance terms.
- Carry the right safety gear for everyone on board. See our guide to life jacket (PFD) requirements.
Is it illegal to overload a boat beyond its capacity plate?
The federal capacity rules are written mainly for builders, but many states make it an offense to operate a boat beyond the plate's limits. Kansas, for example, prohibits carrying passengers or cargo beyond the capacity shown on the plate (K.S.A. 32-1126). Check your state's boating law, and remember the limits exist because overloaded small boats swamp and capsize.
My boat is 22 feet. Does it need a capacity plate?
Not under the federal capacity regulation, which covers monohull boats less than 20 feet. Many larger boats still carry a manufacturer's capacity label, and you should follow it, but the federal Subpart B requirement doesn't apply.
What if my used boat has no capacity plate?
The legal duty to install the plate falls on the manufacturer, so an older or homemade boat may not have one. Contact the manufacturer if it still exists, or ask your state boating agency how it handles missing plates. Don't guess at the limits; err on the light side.
Where is the capacity plate usually located?
Federal rules require it to be permanently displayed where it is clearly visible to the operator when getting the boat under way, which in practice usually means near the helm or the operator's seat (33 CFR 183.25).
Does the persons number include children?
The plate shows a maximum number of persons and a maximum weight. Stay within both. The weight figure includes people, motor and gear, so a boat can be overloaded by weight even with fewer people than the number on the plate.
Sources
- 33 CFR 183.21, Applicability of Subpart B: Cornell LII
- 33 CFR 183.23, Capacity marking required: Cornell LII
- 33 CFR 183.25, Display of markings: Cornell LII
- 33 CFR 183.27, Construction of markings: Cornell LII
- 33 CFR 183.35, Maximum weight capacity, outboard boats: Cornell LII
- 46 U.S.C. § 4307, Prohibited acts: Cornell LII
- Kansas Statutes 32-1126: ksrevisor.gov
About Farrukh Shahzad
Farrukh Shahzad is the founder and researcher behind TodayinTrend. He is not a lawyer and does not give legal advice — he reads the statutes, court rules and official data, then explains what they actually say in plain English.
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