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If you invited me for your birthday I would pay for mine and yours but the rest would have to pay for their own

HAPPY BIRTHDAY TO YOU!!! Have fun

What kind of party is this which invites people to pay to celebrate someone's birthday!? I would throw an invite like this in the trash as soon as I finished reading. It's just common sense. If you're inviting, then you pay everything. Otherwise this is just an unexceptional meeting between friends. You should make it clear (in the invitations) that you will pay a round of full meal (including a certain amount of drink and dessert), but inform in advance that if someone want to repeat a plate or drink more than the combined, they will pay. Understand? You invite, you pay. Regarding the question about gifts, how old are you? 12? You don't ask for gifts. And how discourteous are your friends if they're going for a birthday and don't bring a gift. Even that simple and small, bringing a gift is a synonym of affection. That is, you can't require or base your birthday on gifts, but it's an act of kindness the guest bring one. Another option is to inform in the invitation that each guest helps spliting the bill instead of bringing a gift. Thus, abuse of both sides are avoided.

Well since it's your coworkers, I think it is unwritten code that everyone pays for themselves.

Now the tricky business of it being your birthday but you having set up the lunch date. I would joke it out at the beginning of lunch -

"This is a birthday treat and I'm going to treat myself to the [insert your food order here]."

That's very generous of you to offer to take everyone out.

I suspect that since you invited them out, they will expect you to pay. Be prepared just in case, but maybe you will luck out.

However, if I was going, I would insist on picking up your tab because it's YOUR birthday!!!

Edit: I'm not saying that I would feel that way if someone asked me to join them for lunch on their birthday. You just wouldn't believe how many people don't have manners these days!!!

PS ~ Happy Birthday!!!

Some may insist on paying for yours and their own. I know I probably would. If you want to pay for all of them, make sure you make it perfectly clear before you go...

Someone may offer to pay for you but since you extended the invite they might not. I would order something cheap so your co workers won't mind paying and keep your wallet handy just in case

well happy birthday well they would insist on paying if not bring ur wallet

More than likely they will all pitch in to cover your lunch, let them and return the favor on their b-day. If not they are not very nice people.

maybe some of them but get ready to pay for all

if i were them, i would pay for my own and maybe yours out of common courtesy