The norm, in detail
Single Paper Ballot: one ballot for everyone
Ley 27.781
in forceNATIONAL
State, institutions and security
Ley 27.781 writes the Single Paper Ballot into the Electoral Code: one ballot listing every party in each national election.
What changed and who it applies to
What changed
Ley 27.781 adds a new Chapter IV (Title III) to the National Electoral Code (Ley 19.945) that replaces the system of multiple party ballots with the Single Paper Ballot as the voting instrument for all national electoral processes. Art. 62 establishes the BUP; art. 62 bis sets the content (categories, groupings, candidate names and photos, boxes to vote); art. 62 ter sets the design (non-transparent paper, district/circuit identification, standardized printing); art. 63 orders its approval in a public hearing at least 45 days before the election; and art. 63 bis regulates ballot alignment for homonymous groupings and alliances. verif Oct 18, 2024 ↗
In force
Enacted on October 1, 2024 and published in the Official Gazette on October 18, 2024 (notice 315713). Its first effective application was in the national legislative elections of October 26, 2025; that fact does not appear in the Official Gazette notice (it postdates the rule) and rests on a separate official source (Electoral Observatory, argentina.gob.ar). verif Oct 18, 2024 ↗
Are you in or out?
All national electoral processes: Argentine voters, political groupings and alliances (ballot-presentation requirements), the National Electoral Chamber and federal judges with electoral jurisdiction (design and approval), electoral boards (district implementation) and the Executive Branch (printing and distribution). verif Oct 18, 2024 ↗
The norm
Ley 27.781 - 'Modificación de la Ley N° 19.945. Boleta Única Papel' (amendment to Ley 19.945, single paper ballot), which amends the National Electoral Code (Ley 19.945). verif Oct 1, 2024 ↗
Our reading
The Single Paper Ballot is institutional transparency made law: a single official ballot simplifies electoral logistics and eliminates problems of the multiple-ballot system, in line with rule R3 (clear rules and predictability). It debuted in the October 2025 elections, so it went from rule to practice. What would test it is implementation quality in each district, not the rule itself. thesis
Where it lands, province by province
Applies the same nationwide
No effect lands differently in any one province: it applies the same across the country.
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Ignacio Aredez· Chief analyst
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