How much more can the middle-class share of America’s wealth sink? If the trends we’ve seen so far in the 21st century continue — and if we see no policy changes that could arrest or reverse those trends go into effect — we can expect that Middle 40 share to sink down to 6 percent by 2031. The top 0.01 share, meanwhile, would rise and hit 12 percent, twice as much wealth as the entire Middle 40.

Not good. Even worse: The major policy change that may soon go into effect — the GOP overhaul of the tax system — will accelerate the trends we’ve been witnessing. If the Republican tax plan becomes law, Americans in the Middle 40 won’t just see their share of national wealth continue to slide. They’ll see their actual wealth tumble as well.

The Republican tax plan will engineer this tumble in at least two critical ways.

First, the plan favors certain categories of income while disfavoring others. The cuts the GOP plan makes in the corporate tax rate and the rate of tax on rental income will drive up the value of stocks and rental properties. The value of owner-occupied housing, on the other hand, will likely shrink because the tax plan reduces the tax benefits that come with home ownership.

Who owns the vast bulk of the nation’s stock? Wealthy Americans. The Republican tax plan favors these assets. Unfortunately for the Middle 40, middle class wealth — what’s left of it — rests in the equity middle class people have in their homes.

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Consequently, those provisions in the Republican tax plan that reduce the tax benefits that come with mortgage interest and property tax payments and increase the effective tax homeowners pay when they sell their homes will depress the wealth of the Middle 40 much more than the wealth of the wealthy.

Even a modest reduction in home values, we need to keep in mind, can cause a significant contraction in home equity, the wealth that a home represents. One example: A family owning a $350,000 home subject to a $250,000 mortgage would lose 35 percent of its home equity if the home’s value decreased by 10 percent.