The Huffington Post reports, "CBO warns Republicans that repealing health law would increase deficit by $455 billion." What the CBO actually says is that if Congress repeals Obamacare's $455 billion in "savings" (cuts) to Medicare and other federal health programs through 2019 (the CBO says that the figure is actually over $1 trillion for Obamacare's real first decade, from 2014 to 2023), then this $455 billion in "savings" wouldn't materialize – which is obvious – and therefore if this were the only part of Obamacare to be repealed, the deficit would rise accordingly. This, of course, is true. But nobody's talking about repealing just this part of Obamacare.
Moreover, if Obamacare weren’t repealed, this money "saved" from Medicare would be spent on Obamacare. That's why it's slated to be siphoned out of Medicare in the first place. So the only question is whether this money will go back into already barely solvent Medicare (the scenario under repeal), or will go toward funding a massive new federal entitlement program (the scenario under Obamacare) – while we all try to figure out how we're going to replace the money looted from Medicare.
This is all quite similar to the administration's shameless, have-your-cake-and-eat-it-too claim in its recent Medicare Trustees Report that every dollar taken out of Medicare can be spent on Obamacare and simultaneously saved to spend later on Medicare – a claim that the CBO and Medicare’s chief actuary have explicitly denied.
Repeal would cost only as much as the paper and ink necessary to sign it into law.