First a clarification. It was the title of this thread that caught my interest… ‘This whole "making new money" thing’ . As the definition of M1 is a given, and only the US treasury can create dollars, I have presumed, possibly incorrectly, that “new money” at least somewhat distinct from M1, and is not a US treasury dollar ( cash or digital). For the purpose of any further discussion I’ll use the term digims (‘bitcoin’) for digital dollars.
(I'll apologize up front, because I'm so used to writing this stuff in my own words that I'm sure I'll forget to use your terms. So don't get confused if I don't.)
The dollars that banks create (the asset side of a loan) are indistinguishable from government-created dollars. Both exist mainly as digital dollars. Banknotes, while they can only be
printed by the government, are printed at the request of private banks - when consumer demand for cash warrants it (like around Christmas), banks tell the Fed to change some of their digital dollars (in reserve accounts at the Fed) be converted to banknotes and shipped to the banks. (The conversion to vault cash, btw, is the only way that reserves see the light of day.) This operation does not change M0/MB, it just changes the location of some reserves.
New money can enter the economy in two ways - government deficit spending and private bank loans. In the case of govt.-created dollars, the government holds the liability indefinitely; in the case of bank loans, both the asset and the liability exist in the private sector until the principle is paid off. We say that only the government can create
net dollars, because those dollars enter our economy liability-free (to the private sector). But to the holder, either dollar is exactly the same. The liabilities from bank loans exist in the private sector, but they are not attached in any way to the assets, which get spent and cannot be recovered.
What I mean by “float” is the interval between when the account of someone depositing a non US treasury check is credited and the check is cleared by the fed…. That’s why I put it in quotes, as the bank is ‘balancing their books” with another bank’s IOU. That bank money (IOU) is extinguished by the digim they receive from the other bank when the check clears the fed. On the other end, when the bank pays off with some of their digim (which they had on deposit with the Fed) , a matching amount of the “bank money” in the check issuer’s account is extinguished.
Reserve banking isn't at all intuitive. I like to think of reserve accounts as complementary accounts that serve one purpose - as the way banks settle up between one another. That's it. Only the Fed can change the amount of (reserves + cash) in existence.
So when someone deposits a check from a private bank, reserves move from the reserve account of the originating bank to that of the depositing bank. When you get a check from the government, the Fed adds reserves to the account of the depositing bank. That's how a bank's books are balanced, with deposits as their liability and reserves as their matching asset.
If I'm understanding you correctly, you and I weren't talking about the same thing when you said "float." Bank-created dollars exist from the time of the loan until the time the principle is paid off. If you buy a house on a 30-year mortgage for $300,000, then the builder will immediately get his $300,000, while you will continue to pay off the principle for 30 more years, during which time your unpaid principle will continue to "exist."
As far as the lending bank is concerned, your loan is one of a giant pile of assets (to the bank) and liabilities (deposit accounts, where the bank owes the depositor money on demand). When you make a payment on your loan, the bank marks down your deposit account (the bank's liability), and it also marks down your loan amount (the bank's asset) - the net result is that both sides of the bank's balance sheet have shrunk, and M1 shrinks by the same amount. Money has been extinguished.