* U.S. ADP jobs report in September better than expected * U.S. yield curve flattens as long-end yields slip * McConnell offers debt ceiling extension (Recasts, updates yields, adds debt ceiling developments, analyst comments) By Karen Pierog and Gertrude Chavez-Dreyfuss CHICAGO/NEW YORK, Oct 6 (Reuters) - Yields on the shortest end of the U.S. Treasury curve tumbled on Wednesday after the Senate's top Republican said his party would support an extension of the federal debt ceiling into December, a move that would avert a historic default later this month. The one-month Treasury yield, which earlier hit a session high of 0.1390%, was last at 0.0507%. Yields on Treasury bills maturing around Oct. 18, the date U.S. Treasury Secretary Janet Yellen has said the government would run out of cash, leading to a default, have been sharply elevated since last week. The offer by Senate Republican Leader Mitch McConnell would ease fears of an imminent missed payment on Treasury securities, which could have far-reaching consequences for global markets and the U.S. economy. Republican lawmakers had been unwilling to help Democrats suspend or increase the $28.4 trillion debt ceiling after a two-year suspension expired in late July. Andrew Richman, senior fixed income strategist at Sterling Capital Management, said the short end of the curve has been reacting to "the grinding of the politics" in Washington. "The pressure on the front end is relieved to find at least there will be perhaps a short-term solution," he said. Meanwhile, longer-dated yields fell from more than three-month peaks, taking a respite from a sharp rise in recent sessions, although the rally lost some steam later in the session as Wall Street stock indexes reversed course and moved higher. The benchmark 10-year yield, which earlier hit a session high of 1.573%, was last down 1 basis point at 1.5206% after retreating from June highs along with yields on 20-year and 30-year bonds. The fall in long-end rates flattened the yield curve, with the spread between two-year and 10-year yields narrowing to 122.51 basis points after rising to 127 basis points, its widest since June. Richman said the long end of the curve was looking ahead to U.S. Federal Reserve moves to raise interest rates and taper its $120 billion in monthly bond purchases. "If the jobs numbers come in anywhere near expectations, I believe (the Fed) will announce the tapering in November," he said, referring to Friday's release of the government's September employment data. Ahead of that data, an ADP report on Wednesday showed U.S. private payrolls increased more than expected in September to 568,000 jobs. A rise in Treasury yields after the report was short-lived as buyers stepped in to take advantage of Treasuries' oversold conditions. October 6 Wednesday 3:18PM New York / 1918 GMT Price Current Net Yield % Change (bps) Three-month bills 0.045 0.0456 0.005 Six-month bills 0.06 0.0609 0.005 Two-year note 99-233/256 0.2955 0.008 Three-year note 99-136/256 0.5359 0.014 Five-year note 99-120/256 0.9845 0.007 Seven-year note 99-148/256 1.3134 -0.002 10-year note 97-136/256 1.5206 -0.010 20-year bond 95-168/256 2.0165 -0.026 30-year bond 98-100/256 2.0725 -0.027 DOLLAR SWAP SPREADS Last (bps) Net Change (bps) U.S. 2-year dollar swap 10.00 0.25 spread U.S. 3-year dollar swap 13.00 0.00 spread U.S. 5-year dollar swap 7.50 0.00 spread U.S. 10-year dollar swap 0.50 -0.25 spread U.S. 30-year dollar swap -26.25 0.25 spread (Reporting by Gertrude Chavez-Dreyfuss in New York and Karen Pierog in Chicago; Editing by Andrea Ricci)
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