Legal Question in Business Law in California

Re: Buisness law

Transportation to and from the airport at both ends (cab fare or round trip mileage plus parking); also "per diem" (an amount to cover the cost of your meals) at the rate paid to federal govt. employees, the rate depends on the city, please google [GSA per diem]

Re: Buisness law

If you are doing this voluntarily, or to protect your own interests, there is no requirement that I know of that (a) you do this, or (b) that anyone pay your expenses. On the other hand, if you have been subpoenaed, you are entitled to whatever the jurisdiction allows, which in California isn't much. See Code of Civil Procedure sections 2064 and 2065.

One advantage of appearing voluntarily is that, at least in this case, you're preumably getting more than you would be entitled to as a minimum under the subpoena rules, which currently require the subpoenaing party to pay only $35 a day and 20c a mile in each direction (Government Code section 68093).

There are special rules for expert witnesses, as distinguished from percipient witnesses. If you have been engaged as an expert, ask the attorney who engaged you, but generally you'd be allowed whatever your contract rates are.