Several of my colleagues and I are attending a conference together with our boss. The trip is paid for by the company. Should we expect our boss to handle taxi, tips and so forth?
You didn’t mention in your question whether you have an expense account. If you do, you will pay, then submit the expenses for reimbursement. If you’re not on an expense account, you should take some extra cash on your trip. When your boss accompanies you in taxis, your boss will pay. Otherwise, you pay all luggage, cabs, concierge, bell persons and waiters.
Since you’ll need to know what’s appropriate, check out what Google can provide. Just type in “What should I tip for ____________.” You’ll get tons of current information.