All I have to do is wash the dishes?

I’d like to ask you a grammar question.
Which one is gramatically corret?

All I have to do is wash the dishes.
All I have to do is to wash the dishes.

If the first is right one, I’d also like to know the reason.

Thanks for your help~

well, I think the second one is corrent though. for the first one, it would be correct if u change “wash” to “washing”, “is” should be followed by either n. or prep.

Thanks for your kind answers! :-)

so native english speakers don’t really abide by the grammar rules when they are speaking, it doesn’t matter if u use do, did or does etc right?