How do I know if my 1099B is long term or short term if it doesn't say that on my form?

[Bsch4477]

It should be on the form but long term is an asset that was held for more than a year. 

[ToddL99]

If you held the investment (e.g. stock, bond, land, home. etc.) for 1 year or longer, then it is "long-term".

If you held the investment (e.g. stock, bond, land, home. etc.) for les than 1 year, then it is "short-term".