The end of Fed debt unwind is set. So what's next?

New York

THE US Federal Reserve may be just weeks removed from announcing plans to halt its balance-sheet reduction, but the US Treasury is already looking ahead to when the central bank might start growing its portfolio again.

In the usual drill before the Treasury's announcement of borrowing plans for the next three months - set for May 1 - the department's debt managers asked bond dealers for guidance on Friday. Among the insights sought was when - down to the exact month and year - the banks expect the Fed to resume growing its balance sheet after the roll-off ends in September. The request included the firms' views on the long-run composition of the Fed's balance sheet and the path officials will use to get there.

The Fed has made clear that it wants to ultimately return to its pre-crisis approach of holding only government debt, which will involve slowly replacing mortgage securities with Treasuries. What's unclear is the maturity of Treasuries it will favour.

The twist is that strategists predict that sometime after October the central bank will reach a turning point, when it will need to start increasing its assets again. It would need to do that to prevent bank reserves from declining so far that funding markets become disrupted.

This all matters to the overseers of America's debt because additional Treasury purchases by the Fed would reduce how much the government needs to tap from the the public to meet its funding needs. The Fed's decision also factors into what maturities Treasury decides to issue. BLOOMBERG