(Bloomberg) -- A plan to boost Swiss pensions by giving retirees a 13th monthly payment each year is losing support and may struggle to pass in a national vote next month, according to the final poll before the March 3 ballot.

The measure was backed by 53% in the survey published Wednesday by broadcaster SRG SSR — down from 61% a month ago. That close result means the initiative, which was brought forward by unions, could also miss a required majority among Switzerland’s cantons.

The additional payment — opposed by the government — would increase pensioners’ proceeds by about 8%.

The first plebiscite Sunday of the year will also see another pension measure on the ballot. It seeks to raise the retirement age by one year to 66 and link it to life expectancy after that. The SRG SSR poll showed it will probably fall short of the required votes, with just 35% backing it — compared with 41% in last month’s poll.

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