I explained the budget on twitter but thought it was worth collecting in one place:
Some people are confused on the presidents budget plan. He explained it well in the past but it takes a while to make sense of. With his plan we will continue to go further in debt for years to come. We would have done that anyway though.
We have an established rate of spending that increases the deficit by at least one trillion a year. Fixing that means first lowering the rate at which we are going into debt before you manage to start getting out of debt. There is no way in hell to do it all at once and so the only plan that is doable is one that extends past his potential presidency hence the 10 years.