What is "negative liquid assets" called?

On my personal net worth statement, that pre-spent money is Sinking Fund Offsets, and in my monthly budget, the money set aside for those items is Deferred Spending.

In this case, I'm using more or less the Commonwealth definition of Sinking Fund:

in the United Kingdom1 and elsewhere[2] where the issue of bonds (other than government bonds) is unusual, and where long-term leasehold tenancies are common, the term is only normally used in the context of replacement or renewal of capital assets

Of course, there's no rule of nature saying it must only be used for future capital expenses. Any known future expense (insurance, taxes, vacation, etc) can be paid for using a Sinking Fund.

EDIT: another term is Reserve Fund, which I use for categories where I know "something" will happen, but not when or how much it will cost. Emergency Funds and HSA accounts are examples of Reserve Funds.

You're projected future expenses - have you projected future income to cover those expenses? You may actually never be "in debt" at all.

If you know that you're going to have certain expenses in the future, the responsible thing to do is to account for those in your periodic budget. If you know that you're going to spend $1,200 a year from now, that means that you have to set aside $100 every month to cover those expenses. That should be a line item in your budget to make sure you have enough to cover those expenses when they occur.

If you can't easily fit that into your budget, then that's a different conversation. You have to decide what you're going do do (decrease other expenses, increase income, or forego the expense).

Your goal is to be financially responsible, which is fantastic. But, unless you have significant excess income, it requires serious discipline and hard choices.

Projected shortfall- you've projected your income and expenses out into the future, and if those projections become reality you will have a shortfall in your accounts (unable to meet all expenses). Even without the context of your question, if someone told me that "the business has a projected shortfall in the 2nd quarter of this year", it would be obvious to me what they meant. Their future expenses are greater than their planned income / balance, and they can either prioritize & eliminate expenses, secure a loan for the difference, or identify additional sources of income.