Such money will likely be treated as "income" for support purposes. However, if it isn't a recurring payment, courts usually take that into account. Child support changes might be limited to the period when payment is received, such as the current year.
It's also important to know that courts have discretion to go outside of state child support guidelines, especially when a parent has a large amount of assets, but not a lot of income.
Your husband and his business are obligated to report accurate income to the IRS on tax returns and related filings. Most states' laws require courts to consider income from all sources when calculating child support. This can include income from wages, interest, dividends and other business sources.
401(k) deposits might be considered income, or they might not. Your employer's matching funds are more than likely not going to be included, but it depends on state law.
Stock options, however, may be included in computations. Stock options allow you to defer significant income into the future, thereby avoiding having the support obligation apply to the income. State law might easily include such benefits.