I'm remodeling my bathroom and I tore up the existing floor which had about 4 layers of laminate. Now, I am at the concrete floor slab and the toilet flange is about 3/4" to 1" above the slab. I was just going to tile around the toilet but the toilet rocks because the flange is too high.

The doesn't rock if I place a couple of pieces of tile under it.

1) Should I just tile right up the waste pipe and then screw the flange to the tile? Can the tile take this? Or do I have to put something else under the flange and put the tile to that?

I think it's a cast iron pipe with a cast iron flange. I'm no plumber by any means and I really have absolutely no idea what to do.

Well, I am not a plumber either, but it seems to me that if the tile fits under the flange, you should install the tile. Make sure it goes all the way under the flange to the pipe leaving no voids. I think you should be fastening the flange down THROUGH the tile to the underlying concrete

1) Should I just tile right up the waste pipe and then screw the flange to the tile? Can the tile take this? Or do I have to put something else under the flange and put the tile to that?
If you tile under the flange will that bring the flange level with the floor so you can set the toilet without any rocking or will it still be too high.
If the flange needs to be lowered here's how I would go about it.
Take a block of 2 X 4 and start to tap around the flange to take it down to finished floor level. Take a adjustable crescent wrench and
nibble off the cast iron pipe down to the flange. Since this is a lead and oakum joint that you've disturbed you will have to recaulk the lead joint. This will secure the flange to the finished floor and insure a waterproof joint.
Good luck. Tom

Yes, I think that it will bring it flush with the floor without any rocking. If you do tap down the flange, do you just caulk under the exterior of the flange or the inside? Thanks for you help!

You don't actually caulk a cast flange, its molten lead and oakum for the seal.

MeSince this is a lead and oakum joint that you've disturbed you will have to recaulk the lead joint.

Bob You don't actually caulk a cast flange, its molten lead and oakum for the seal.
My bad!! I should have been clearer in my explanation. Yes,you will have to recaulk the lead joint usinga set of inside and outside caulking irons,(see image).
No, you won't use cauking compound under the flange. Sorryfor any confusion. Tom

I knew what you meant, Tom, but thought lost11 was about to grab his caulking gun when he said "caulk under the exterior of the flange." I guess he could also remove the cast flange and go with an Oatey twist-n-set.

Thanks a lot for the help. It was flsuh with the tile so I didn't have to do anything. Thanks for the clarification because I didn't know what you meant. Thanks again for the help.