Kevin Warsh is expected to become the next Federal Reserve chairman after getting an OK from the Senate Banking Committee. Assuming the full Senate confirms his nomination, he will succeed Jerome Powell (who has held the position since 2018) by May 15.

Powell, however, has said he isn’t leaving the Federal Open Market Committee, which oversees the Fed’s monetary policy decisions. He plans to stay on as a governor and could present a stark contrast to the incoming chairman.

Kevin Warsh disagrees with one key policy Powell has supported that has been used to influence interest rates without directly changing the fed funds target rate. And reversing course on this policy could have a major impact on financial markets.

The Federal Reserve’s two tools

Warsh sees the Federal Reserve as having two main tools to fulfill its dual mandate of full employment and stable pricing. The first tool gets a lot of headlines: interest rates. The Fed is in charge of setting the target overnight borrowing costs for banks, the fed funds rate.

The second tool, holding a balance sheet of bonds and reserves, is where Warsh holds a very different stance than Powell and his recent predecessors. “The Fed balance sheet has played a particularly, I think, unhelpful role in helping the Fed achieve its dual mandate,” Warsh said in his confirmation hearing. While Powell’s Fed has used the balance sheet to buy long-term government bonds and mortgage-backed securities to tighten long-term interest rates, Warsh thinks that’s a mistake.

Warsh would prefer to reduce the assets on the Fed’s balance sheet, which would have a notable impact on the markets. The Federal Reserve currently holds over $6 trillion in securities on its balance sheet. A massive seller in the market would put pressure on bond prices, thus increasing the effective interest rate. The FOMC could offset that increase by lowering the target fed funds rate, something President Trump has been pressuring Powell to do since the start of his second term.

Reducing the balance sheet without disrupting markets is a tough task, though. When the Fed sold off assets in 2019, short-term interest rates spiked along with long-term interest rates. In the most recent campaign to reduce the balance sheet, launched in 2022, the same thing happened, prompting a reversal of course starting in December.

Warsh has acknowledged that it will take a long time to unwind the balance sheet. Even if done with the utmost caution, the impact on investors will be noticeable, and not just bond investors.

The stock market could see some major changes

Warren Buffett once made the analogy that interest rates are like gravity to asset prices. Higher interest rates mean lower asset prices. That’s because every other asset is first compared to the risk-free rate investors could receive from buying Treasury bonds.

If long-term interest rates increase, investors will place a greater discount on companies’ future earnings and cash flows. That could hit growth stocks particularly hard, as they’re expected to produce significantly more earnings and cash flow well out in the future.

If those earnings are discounted at a higher rate, they’re worth less today. As a result, the S&P 500 and Nasdaq Composite could see a drop in value.

Beyond valuations, though, borrowing costs will rise for many consumers and for some companies issuing longer-dated debt. That could slow consumer spending and reduce earnings growth for many companies.

If higher long-term rates enable the Fed to cut the target fed funds rate, it could mitigate some of the pressure. Importantly for investors, lower short-term borrowing rates and a steepening yield curve (where the gap between short-term and long-term rates widens) would favor slower-growing value stocks.

Investors should position their portfolio to prepare for a new Fed under Warsh’s leadership. While he will face some opposition, including the likelihood of butting heads with Powell, he’ll hold tremendous influence over the future of the central banks’ policies, and it could have a big impact on your portfolio.