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The most wonderful time of the year for a Fed liftoff isn't December

Federal Reserve Bank Chair Janet Yellen holds a news conference following a meeting of the Federal Open Market Committee at the Fed on June 17, 2015.

[WASHINGTON] Federal Reserve officials trying to decide when to raise interest rates for the first time in a decade may want to avoid waiting until December to make their move.

The reason: Treasury-market liquidity has a clear pattern of thinning out at year-end, potentially exacerbating volatility in reaction to an increase in the Fed's benchmark rate. A sharp rise in yields could hurt the economy and complicate liftoff.

These concerns won't be a deal-breaker if economic data support a rate rise in December and not sooner, economists say. Still, they could make officials look more favorably upon a September or October start. Fed Chair Janet Yellen has said liftoff will be appropriate this year if the economy evolves as expected.

"Our sense is the Fed would love to raise in September," said Lori Heinel, chief portfolio strategist Boston-based State Street Corp, which manages US$2.45 trillion. "The longer they wait, other things start to become considerations, including concerns about year-end liquidity and the volatility that may introduce." The Fed has said it will tighten if the labor market continues to improve and it's "reasonably confident" inflation will move back up toward its 2 per cent objective. While the central bank is nearing its target for full unemployment - the jobless rate fell to a seven-year low of 5.3 per cent in June - inflation has lingered below the goal for three years.

Some 76 per cent of economists expect the first rate rise at the Federal Open Market Committee's September meeting, a Bloomberg survey taken July 2-8 shows. Just 6 per cent expect a change in October - a meeting that isn't accompanied by a press conference - and 10 per cent expect a December move.

Ms Yellen holds press conferences after every other meeting, and economists say she would prefer to move on raising rates at one of those meetings, although she has said every gathering is live. Just 4 per cent of economists in the survey predicted a move at next week's meeting.

Turnover in Treasuries has historically dipped during the final weeks of the year. The volume traded through ICAP Plc, the largest inter-dealer broker of US government debt, averaged US$288 billion a day back through 2010. In contrast, the average over the final two trading weeks of each year from 2010 through 2014 was US$137 billion.

Liquidity in Treasuries tends to dry up in December when investors ranging from pension funds to banks buy government securities and hang onto them to make their holdings look safer for year-end reporting requirements. Trading volume also declines as dealers leave their desks for the holidays.

Thinner year-end markets translate into larger movements in prices. Volatility on options that expire in a few months on two-year US rates, whose short-term maturity makes them most affected by changes in Fed policy, has moved higher during the final month of recent years. Volatility on these three-month options rose 30 per cent in December from the prior month, and 50 per cent in the final month of 2013.

Officials discussed the risk of increased volatility at liftoff in April, minutes of the meeting show. They discussed the so-called taper tantrum in 2013, when Treasury yields jumped after then-Chairman Ben Bernanke said the Fed might soon start reducing its bond purchases.

A steep rise in yields might be a bigger drag on the economy than officials would like to see. Ms Yellen, concerned that a sharp rate increase could derail the recovery, last week said she prefers to "tighten in a prudent and gradual manner." In addition, volatility has risen in the final days of the last two quarters for repurchase agreements, the money-market instrument the Fed will deploy to tighten policy, due to banks stepping back from the market to manage their balance sheets. That may make it tougher to achieve a smooth liftoff.

When the Fed decides to raise rates, it will be using a new set of tools that will allow it to navigate the trillions of dollars in excess reserves that it created in the course of three rounds of large-scale asset purchases.

"This is an unprecedented rate increase, the mechanisms for which are relatively untested, and they will probably want to refrain from doing that at year-end," said Gennadiy Goldberg, US strategist at TD Securities USA LLC in New York.

The Fed has said it will seek to keep the federal funds rate, which represents the cost of reserves that banks borrow and lend in the overnight market, in a 25 basis-point range.

The top end of the range will be determined by the interest rates the Fed pays banks on excess reserves, currently 25 basis points, or a quarter of a percentage point.

The bottom end will be set by the Fed's overnight reverse repurchase agreement programme, currently at 0.05 per cent. In those agreements, the Fed borrows cash from money-market counterparties and posts bonds from its portfolio as collateral. The next day, the Fed returns the cash plus interest and gets its bonds back.

Economists said that if the Fed wants to be confident of achieving a smooth liftoff, and wants to see that their reverse repurchase tool is working as intended, it makes sense to pick a period when liquidity won't be questionable.

The Dec 15-16 timing of the final FOMC meeting of the year, in the middle of America's most important retail sales season, may also be a consideration for officials concerned that a rate increase could drive share prices lower and harm consumer confidence.

"A considerable hit to consumer confidence during the key shopping season of the year, that could substantially reverberate throughout the economy," Goldberg said. "That's something the Fed is keen to avoid." On the other hand, the Fed has shown a willingness to overlook technical volatility in the past: Tapering of the Fed's bond-buying campaign was announced in December 2013. It also raised rates in December 2004 and December 2005, though that tightening cycle got under way in June 2004, and officials weren't relying on overnight repos to steer fed funds higher.

While December is an imperfect choice, policy makers will opt to move then to avoid pushing liftoff further into the future, economists at BNP Paribas wrote in a July 9 note.

"December is not ideal for liftoff, given likely thin year-end liquidity," they wrote. "It's better than waiting until March. It's now our central case." Laura Rosner, US economist at BNP Paribas in New York, said she didn't view the Jan 26-27 FOMC as likely for a rate move because it lacked a scheduled press conference.