* Euro back down at $1.0475 after Friday's spike to $1.0700
* Dollar steady around 117.40 yen, trade thinned by Japan holiday
* Diverging yield trends, tax plans underpin dollar
* Aussie up on firm Caixin survey, wary of China forex flows
By Wayne Cole
SYDNEY, Jan 3 (Reuters) - The U.S. dollar held firm on Tuesday as the prospect of rising U.S. interest rates this year kept sentiment bullish, while a surprisingly upbeat reading on Chinese manufacturing gave the Aussie dollar a lift.
A holiday in Japan made for quiet early trade, leaving the dollar steady around 117.40 yen JPY= but well up on Friday's trough of 116.05. Against a basket of currencies, the dollar was up 0.5 percent at 102.720 .DXY .
The euro was sulking at $1.0475 EUR= despite strong manufacturing data for the single currency bloc, having surrendered all of Friday's brief spike to $1.0700.
A dearth of liquidity was largely behind the wild swings, though the market is now so long dollars that it is vulnerable to sudden corrections.
Data released on Friday showed speculators increasing their bets on the dollar in the week up to last Tuesday after cutting positions for the first time since October in the previous week. IMM/FX
The greenback had soared to 14-year highs in December on speculation the U.S. Federal Reserve will hike rates as many as three times this year, and that President-elect Donald Trump will stoke growth and inflation with debt-funded tax cuts.
Treasury yields have jumped in anticipation while central banks in the euro zone and Japan are still working to keep their short-term yields deep in negative territory.
As a result, U.S. two-year debt US2YT=RR pays 200 basis points more than German debt and 138 basis points more than Japanese bonds.
"Following a period of consolidation between now and late January, we believe the USD will put on another 10 percent of gains over the next eighteen months," said Richard Grace, chief currency strategist at CBA.
Grace argued Trump's proposed plans for a U.S. company tax cut could be particularly bullish for the dollar since it would likely encourage a wave of repatriation by domestic firms and demand for U.S. equities by foreign investors.
"We anticipate some twelve-to-eighteen months of USD strength, beginning when the Trump Administration gets its tax cuts through the Congress," he added, citing late March as likely timing for passage.
Dealers are also keeping a wary eye on the yuan as annual quotas covering how much foreign currency Chinese individuals can buy are reset this week.
China's foreign exchange regulator said on Saturday that the $50,000 annual individual quota will remain unchanged, but some banks have told customers that purchases of foreign currency for buying property, securities and life insurance were not allowed. new rules on overseas currency transfers are not capital controls, the official Xinhua news agency reported,
There has been talk investors could rush to sell the yuan fearing further depreciation in the currency, forcing the country's central bank to run down its reserves to head off a self-fulfilling spiral.
Some in the market have hedged the risk by shorting the Australian dollar, typically used as a liquid proxy for the yuan. Yet the Aussie got a lift to $0.7215 AUD=D4 on Tuesday after a survey showed China's factory activity picked up in December, with output reaching a near six-year high.
The Caixin/Markit Manufacturing Purchasing Managers' index (PMI) rose to 51.9, from 50.9 in November. ECONCN
(Editing by Kim Coghill and Jacqueline Wong)