user91116: Presume that I have 1 BTC (the total of my UTXO) and I have to pay Bob With 1 BTC. 
I set 0 for fees.
My Input is 1 and my Output is 1 versus Bob or there are always 2 outputs? 
one versus Bob 
and 
one versus my change address with 0 btc?

user5273: There will be no change in this scenario on only one output sent to bob's address. Note that 0 fee transactions are unlikely to be mined these days so do include a fee. Usually you let your wallet calculate a reasonable fee for you.

91116: <p>Presume that I have 1 BTC (the total of my UTXO) and I have to pay Bob With 1 BTC. 
I set 0 for fees.</p>

<p>My Input is 1 and my Output is 1 versus Bob or there are always 2 outputs? </p>

<p>one versus Bob </p>

<p>and </p>

<p>one versus my change address with 0 btc?</p>
 5273: <p>There will be no change in this scenario on only one output sent to bob's address. Note that 0 fee transactions are unlikely to be mined these days so do include a fee. Usually you let your wallet calculate a reasonable fee for you.</p>
