Good free rental property tax calc

[Anthony R.]

Let me preface this with I ALWAYS hire someone. I attempt to estimate my tax bill every year and I am ALWAYS wrong. I pay a CPA, I've learned my lesson. 

That being said, this whole tax thing really works me up. I am always nervous that I am going to get blindsided with a giant tax bill. I save up for it but I don't know what it's going to be until the tax elves work their magic. This stalls all progress I make in the first quarter of the year because I am afraid if I buy stocks or a new property that I am going to over extend myself when my tax bill comes. 

Alright, so my question is..... Is there a reliable tax estimator for someone who gets a W2 - a 1099 and has rentals?