Oooh...I didn't think that's what Hairy meant.
I am a goood girl. I never budget money I haven't actually received. What I meant is that you can schedule income in the scheduler, so that when it comes into the account, it's already entered in YNAB for clearing.
So, for example, I set a scheduled income of £200 for 10/09/13, then on 10/9/13, I check the bank account. £200 has cleared, so I go into YNAB, where the scheduler has entered the transaction. I clear it. If it hasn't cleared in the account, then I change the date to a date a few days hence and set it back into the scheduler.
tribpot is exactly right that if you simply enter the future income as a transaction in the main account screen with a future date, it will show in your budget as 'Available to budget'.
tribpot yes, I have my categories set up such that I know which direct debits go on which week, so I can just work down the list allocating money to them, until I reach $0. Then, the next week, I start where I left off and repeat.