What will likely happen is, T-Bills with those maturity dates will have a higher risk premium and trade at lower values. People like Warren Buffet will gobble them up because they are still zero risk if you are willing to hold them for a few extra months while the debt ceiling issue is worked out. If things get really bad, the fed could offer to buy them with a haircut to ensure markets have liquidity.
The T-Bill is the cornerstone of the global financial system. Even with a technical default, no one believes the government won't eventually pay. And if you believe they won't, you should be buying physical gold, guns & ammo + food stuffs because it would be Mad Max'ish were that to happen.
The real issue is, if the government is in technical default, the credit rating agencies will downgrade the UST bill. That will result in higher interest rates on ALL government debt as it eventually revolves through. That means less money for existing programs.
I think for "main street", it will be a disaster. The fallout could rival the 1930's depression and people's 401Ks will probably loose 30% to 40% of their value.
Why Wall Street is still backing these GOP idiots is beyond me. We seem to be in a shift of US Party priorities. Seems the Dems are heading to support businesses while pushing social conscience. Seems some in the GOP is trying to do what they can to steal from Social Security/Medicare and crash world economy.
I've seen a few articles by constitutional lawyers that state the 14th amendment requires the US pay its debts, and the debt ceiling is a fiction (although, depending upon how the administration proceeds, it could take time to go through the courts; i.e., if the administration/treasury treats the debt ceiling as real).
https://www.theatlantic.com/politics/archive/2011/05/our-nat...
Some interpret this to imply that the courts could intervene in any case where legislative action would cause the US to fail to pay any existing debt. I think it's uncertain though, and I am curious what people more familiar with consitutional law think about this.
If they don't pay there will be a market for them. Everyone will believe the debt ceiling will be somehow fixed and many players will be willing to buy T-bills at some discount -- probably very slight, but who knows? The Fed might also step in to buy them.
The general expectation is that Washington will avoid this in the first place but they're all getting dumber and I think the possibility of it happening eventually is no longer zero.
[0] Day of the debt. https://www.npr.org/2021/11/23/1058529788/day-of-the-debt
Plus the US Treasury can unilaterally create a $1 trillion coin and increase the debt ceiling that way.
I have been completely ignoring this nonsense since 2 or 3 iterations ago, don't get too sucked into this.