(Corrects reference to euro's performance in 16th paragraph to 2003 from 2013)
* Dollar index stuck near 1-month low
* Seasonal factors seen weighing on dollar at year's end
* Australian, Canadian dollars at 2-month highs
By Shinichi Saoshiro
TOKYO, Dec 29 (Reuters) - The dollar wallowed near a one-month low against a basket of currencies on Friday, while commodity currencies such as the Australian and Canadian dollars were at two-month highs thanks to firmer energy and metals prices.
The dollar index against a basket of six major currencies .DXY was unchanged at 92.602 after slipping 0.4 percent overnight to 92.573, its lowest since Nov. 27.
The index was on track to lose 0.5 percent this month.
Shin Kadota, senior strategist at Barclays (LON:BARC) in Tokyo, said rebalancing of positions by market participants signaled broad selling of the dollar, particularly the yen, towards the year's end.
"Seasonal trends in the currency market have shown that the dollar tends to weaken after Christmas through the first few days of the following year before eventually being bought back again," he said.
Many institutional investors close their books at the year-end, a deadline for taxation and performance reporting, a time seen leading to dollar selling pressure.
The dollar index will likely end the year down more than 9 percent, its worst showing since 2003, and a Reuters poll showed it is expected to lose a bit more ground against other major currencies next year. dollar sagged in 2017 although the U.S. economy expanded, the Federal Reserve tightened monetary policy and the United States enacted a major overhaul of its tax code.
Tensions stemming from the Korean Peninsula, the Russian scandal dogging U.S. President Donald Trump's election campaign, and low U.S. inflation were some of the factors that shackled the dollar in 2017 and expected to continue weighing on the currency in 2018.
"The Fed and European Central Bank are poised to normalise policies in 2018 but due to limited inflation concerns, volatility in currencies is likely to be curbed," wrote strategists at Sumitomo Mitsui Asset Management.
"But geopolitical risks linked to North Korea and the Middle East and political risks posed by Brexit negotiations and the U.S. midterm elections bear watching in 2018."
The dollar was 0.1 pct lower at 112.735 yen JPY= . It had slipped to a nine-day low of 112.660 overnight, having gone as high as 113.750 on Dec. 12. It was headed to lose 3.5 percent against its Japanese peer in 2017.
The euro was steady at $1.1947 EUR= and in close reach of a one-month high of $1.1959 scaled the previous day. It has gained 0.3 percent in December.
The common currency showed little immediate reaction to Italy's announcement that it will hold an election on March 4, as such an outcome had been anticipated. The poll is expected to produce a hung parliament and possibly some market turbulence in the euro zone's third-largest economy. addition to political factors such as the Italian election in March, a key factor for the euro in 2018 is how the European Central Bank proceeds with curtailing its massive monetary stimulus.
The euro has risen 13.5 percent this year, its strongest annual gain since 2003. It was lifted by factors including relief over the French elections and expectations for the ECB to normalise monetary policy while taking in stride political developments in Germany and Spain.
The Australian dollar was effectively flat at $0.7795 AUD=D4 having surged to a two-month peak of $0.7810 the previous day.
The Aussie was headed for a 3 percent monthly gain, lifted by a rise in the prices of commodities like iron ore and copper.
The Canadian dollar extended its overnight rally to touch C$1.2555 CAD=D4 per dollar, its strongest since Oct. 20.
The loonie was on track to gain 2.5 percent in December, boosted by a surge in crude oil prices.
The New Zealand dollar edged up to $0.7099 NZD=D4 , its highest since Oct. 19. The kiwi retreated to a 17-month trough of $0.6781 in November, buffeted by a change of government, but has bounced back nearly 5 percent from that low.
Bitcoin was last up 3.2 percent at $14,908.44 BTC=BTSP on the Bitstamp exchange having sunk 6 percent on Thursday. It was off the record highs near $20,000 touched 12 days ago but still headed for a gain of roughly 1,400 percent in 2017.