The so-called solidarity contribution of 50,000 Swiss francs ($A91,000) aims to provide swift financial support to victims and serve as a gesture of compassion, Switzerland's governing Federal Council said.
In principle, the payment should apply to each individual who lost their life as well as every person who was hospitalised, the Federal Council said in a statement.
"The Federal Council shares with the victims and their families the desire for truth and justice," Swiss President Guy Parmelin told a press conference.
"We too want to know what happened, why, and how it could have been prevented."
Witnesses and prosecutors said the blaze appeared to have been started by the use of sparkling candles that ignited foam soundproofing on the bar's basement ceiling.
All told, the federal government would put up 7.8 million francs ($A14.2 million) for 156 individuals most severely affected by the fire, Justice Minister Beat Jans told the press conference.
That sum, he said, would complement aid provided by Crans-Montana's home canton of Valais, which has pledged 10 million francs ($A18.2 million) to a foundation to support the victims.
Swiss authorities said 115 people were injured in the fire. Most of those who died were teenagers and many of the victims were foreigners, including several from France and Italy.
The Federal Council said it will also convene a roundtable to help victims, insurers and authorities reach out-of-court settlements, potentially averting lengthy legal battles. It aims to contribute up to 20 million francs ($A36.4 million) to such settlements.
The Federal Council said it hoped parliament would quickly expedite the legislation it had drafted to help the victims.
The government also aims to allocate 8.5 million francs ($A15.5 million) to help affected cantons cover extraordinary costs.
The government said it had taken the steps following analysis by the Federal Office of Justice which found gaps in existing support systems, which are primarily designed for individual cases and struggle with large-scale disasters.
