Aryeh Leib Thorne Toren

← Israel 2026 · עברית

Split or resignation: two ways to leave a list, and why the law treats them so differently

Explainer. Neutral and non-partisan; no list is endorsed.

Thirteen days before the vote on 27 October 2026, Channel 14's Mati Tuchfeld asked a plain question: what is the difference between leaving a faction and splitting from it? It sounds like a technicality. His own one-line answer was: "A split is divorce by the book; defection is running away from home without paying alimony" (Channel 14 segment; quoted from the video's automatic transcript, single source, not yet confirmed). It is actually the line between a group that leaves together, which the law allows, and a lone member who walks away with a seat the voters gave to a list.

The rule in one sentence

Section 6A of Basic Law: The Knesset says that a member who leaves his faction, and does not resign from the Knesset when he leaves, may not appear at the next election on the list of any party that had a faction in the outgoing Knesset. The same section exempts a faction split "under circumstances determined by" law.

What counts as a split

The Knesset Law sets those circumstances. Under section 59(1), a split needs a group of at least two members who together make up at least one third of the faction. Under section 59(2), a faction formed by a joint run of separate parties may divide back along its original party lines. In 2021, Amendment 49 added a third path: any four members could split, whatever the faction's size. In December 2022, Amendment 51 repealed it and restored the one-third rule.

What happens to a lone defector

Once the Knesset House Committee rules that a member has left his faction, he sits as an unattached member for the rest of the term and may not join any other faction. He may not serve as a minister or deputy minister in that Knesset unless he resigns his seat. He keeps most parliamentary rights, but under the Knesset Rules of Procedure he cannot move a no-confidence motion. And under section 6A he cannot run next time on the list of any party already in the Knesset.

What happens to a lawful split

A group that splits lawfully can form a new faction or join an existing one, serve in government, and run again. The main cost is money. The Israel Democracy Institute notes that a split early in the term costs the new faction its ongoing public party funding, while the original faction goes on drawing funding for its full elected size.

The arithmetic is the point

Take a 12-seat faction. One third is 4. Three members walking out are three defectors. Four are a new faction. That threshold explains why 2021 changed the rule and 2022 changed it back. Each majority wrote the number that suited the danger it faced at the time. Both sides said so in the Knesset debate. Supporters of Amendment 51 said a member elected on a party's platform who disagrees should "return the mandate rather than split off." Opponents called it personal legislation passed in a hurry.

This cycle's examples

Why it matters on 27 October

A vote is cast for a list, not for a name. The Bader-Ofer count turns each list's votes into seats: quota q = V_qualifying/120, first seats floor(v_i/q), then the remaining seats one at a time to the highest v_i/(s_i+1). The seats belong to the list's arithmetic. A defector who takes a seat across the aisle breaks the link between that arithmetic and the government that forms. A split, with its one-third floor, is the law's compromise. It makes room for real ideological breaks, which tend to be shared, and keeps out the individual auction.

That is also why withdrawals like Ben Zion's matter more than they look. A list that falls below 3.25% throws all its votes out of the quota. In a fragmented field (see the effective number of parties, N = 1/Σp², in our threshold analysis), one list falling short can move the threshold for who governs more than any surplus-vote agreement can.

The parsha: two ways to part

This Shabbat we read Noach. At Bavel the people were "one language and one speech," yet their unity was aimed at a tower "lest we be scattered." The answer came from above: "וַיָּפֶץ ה' אֹתָם מִשָּׁם" — "and G-d scattered them from there" (Bereishit 11:8). That parting was imposed, without consent, and as a judgment.

The Shabbat after, Lech Lecha, gives the other model. When the herdsmen of Avram and Lot quarrel, Avram does not walk out on his own. He proposes terms in the open: "הִפָּרֶד נָא מֵעָלָי, אִם הַשְּׂמֹאל וְאֵימִנָה וְאִם הַיָּמִין וְאַשְׂמְאִילָה" — "Please separate from me: if you go left, I will go right; if you go right, I will go left" (Bereishit 13:9). It is an agreed division, done before witnesses, to keep the peace: "for we are brothers" (13:8).

The Knesset Law, without meaning to, follows Avram. A split is a recognized parting. It is done openly, by a real group, and recorded by the House Committee. Defection is what Bavel leaves us with: individuals scattered from the list they came in on. The law cannot make politicians brothers. It can insist that when they part, they part like Avram, with terms and in the open, and not one by one in the dark.

What to watch through 27 October

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