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グループ通算制度 (Japan group tax-sharing regime) — the 2022 successor to 連結納税, loss-offsetting in wholly-owned groups, and its interaction with restructuring

Confidence: Likely Updated 2026-06-03 Review by 2026-12-03 Sources 5 Machine-translated Original (JA)
#corporate-strategy#tax#japan#group-taxation#holding-company#loss-offset
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This entry sits under corporate-strategy INDEX and routes into finance INDEX for the group-capital overlay. It covers the ongoing group-tax regime that becomes a live design factor the moment a group sits under a parent — so read it directly after holding-company conversion (which creates the parent-subsidiary structure this regime taxes), alongside Japan Kaisha Bunkatsu Tax Regime for how the loss-carryforward rules interact with splits, and with Japan Gappei Merger Regime for how losses move on combination.

TL;DR

グループ通算制度 (group tsūsan seido, group tax-sharing system) is Japan’s regime for taxing a wholly-owned corporate group as an economic unit while keeping each company a separate taxpayer. It is the successor to the old 連結納税制度 (consolidated-tax system), which was abolished and replaced effective for fiscal years beginning on or after 1 April 2022.

The single most important feature is 損益通算 (loss-offsetting): profits of one group company can be offset against losses of another in the same wholly-owned group, so the group pays tax on its net position rather than taxing winners while stranding losers’ losses.

The headline change from the old regime:

  • 連結納税 (old, pre-2022) — the parent filed one consolidated return for the whole group; a correction in any subsidiary forced a group-wide recomputation, creating heavy administrative burden on the parent.
  • グループ通算 (new, from 2022) — each company files its own return and computes its own tax, with loss-offsetting and certain items adjusted across the group. A later correction at one company is largely ring-fenced (遮断) to that company, sparing the rest a full re-file.

Two distinct concepts must not be confused — Japan has two group-tax frameworks running in parallel:

  1. グループ法人税制 (group corporation-tax rules) — mandatory and automatic for every 100%-group, covering things like tax-free intra-group asset transfers and full dividend exclusion. No election.
  2. グループ通算制度 (group tax-sharing) — elective, adds 損益通算 of profits and losses across the wholly-owned group. You opt in.

1. Why a Group-Tax Regime Exists

Absent any group regime, each company is taxed standalone: a parent earning ¥100 of profit pays tax on ¥100 even if a sister subsidiary lost ¥100 the same year — the group as a whole made nothing, yet pays tax. A group regime fixes this by letting the loss offset the profit. This is precisely the lever that makes a holding-company structure tax-efficient: once operating businesses sit as subsidiaries under a parent, the group can net their results instead of being penalized for housing winners and losers in separate legal entities.

The trade-off is complexity and commitment — which is why the regime is elective, scoped to 完全支配関係 (100%-ownership) groups only, and hedged with anti-abuse rules so groups cannot cherry-pick losses opportunistically.

2. 連結納税 → グループ通算 — What the 2022 Reform Changed

Feature連結納税制度 (pre-2022)グループ通算制度 (from 2022)
Filing unitParent files one consolidated returnEach company files its own return
Tax computationGroup computed as a single entityIndividual computation + cross-group adjustments
Effect of a later correctionGroup-wide recomputation遮断 (ring-fenced) to the affected company in most cases
Loss-offsetting (損益通算)YesYes — retained (the core benefit survives)
Administrative burdenHeavy on the parentDistributed; e-filing mandated
Scope100%-group100%-group (完全支配関係)

The reform’s purpose was to keep the損益通算 benefit but kill the administrative drag of single-return consolidation. Groups already in 連結納税 generally transitioned into グループ通算 automatically unless they filed a notice to opt out before the first fiscal year starting on/after 1 April 2022.

3. グループ法人税制 vs グループ通算制度 — Two Layers, Don’t Confuse Them

This is the regime’s most common point of confusion, mirroring the 株式分配-vs-パーシャルスピンオフ confusion that the Japan Kabushiki Bunpai Spinoff Regime entry settles on the spin-off side:

グループ法人税制 (group corp-tax rules)グループ通算制度 (group tax-sharing)
ElectionMandatory / automaticElective (opt in)
ScopeEvery 100%-group100%-group that elects
Core contentTax-deferred intra-group asset transfers (譲渡損益の繰延); 100% dividend exclusion between group members; donation/receipt adjustments損益通算 of profits and losses across the group; group-level use of certain credits
Mental modelThe baseline rules that apply to any wholly-owned group whether you like it or notAn add-on that nets the group’s taxable income

So a 100%-group always gets the グループ法人税制 baseline (e.g., it can shuffle assets between members without triggering gain), and may additionally elect グループ通算 to net profits against losses. The two coexist.

4. How 損益通算 Works (High Level)

Under グループ通算, in a given fiscal year:

  • Each company computes its own income or loss.
  • The losses of loss-making members are allocated against the income of profit-making members in proportion (按分) to their respective income, lowering the group’s aggregate tax base.
  • A later correction at one company is, in most cases, 遮断 (blocked) from disturbing the others’ computations — the key administrative improvement over the old single-return model.

The benefit is real cash: a profitable parent in a HoldCo structure can absorb an investment subsidiary’s start-up losses, deferring or reducing group tax during the build-out phase — which is one reason the regime interacts so closely with restructuring strategy.

5. Interaction with Restructuring — Where This Domain Cares

グループ通算 is not just an accounting election; it shapes whether and when restructuring is tax-efficient:

  • Holding-company conversion — after a Japan Holding Company Conversion, the new HoldCo + operating subsidiaries form a 100%-group eligible for グループ通算, so the conversion’s ongoing tax efficiency (not just the one-time 適格 treatment) depends on this regime. The conversion mechanics route through Japan Kabushiki Koukan Iten Regime.
  • 会社分割 and loss carryforwards — when a business is carved out by Japan Kaisha Bunkatsu Tax Regime, the anti-loss-trafficking rules (Corporation Tax Act art. 57 et seq.) interact with how 繰越欠損金 can be used inside a 通算 group; an ownership change can restrict otherwise-usable losses.
  • 合併 and inherited losses — a qualified merger can carry a target’s 繰越欠損金 to the survivor, again subject to the anti-trafficking tests; whether those losses then feed group-wide offsetting depends on the 通算 status of the survivor’s group.
  • Joining / leaving a group (加入・離脱) — when a company enters or exits a 100%-group (e.g., via acquisition or spin-off through Japan Kabushiki Bunpai Spinoff Regime), the regime has specific rules on time-apportionment, asset mark-to-market on entry/exit, and treatment of pre-entry losses — designed to stop groups importing or stripping losses around the membership boundary.

This is the “recurring tax-versus-structure tension” the domain index points at: the legal structure (who owns whom) and the tax regime (how the group is netted) have to be designed together.

6. Why It Sits in Corporate Strategy, Not Just Tax

A group-tax regime might look like pure compliance, but it is a strategic structuring input:

  • It is a primary reason groups adopt a pure-HoldCo model — a neutral apex over 100%-owned operating subsidiaries that can net results across the portfolio.
  • It influences where to house a loss-making new venture (inside the 通算 group, so its losses offset group profits, vs outside it).
  • It interacts with the dividend-flow design of a HoldCo (the 100% intra-group dividend exclusion under グループ法人税制 keeps cash moving up to the parent untaxed).
  • For regulated financial groups, it overlays the HoldCo supervision that organizes the entities in the listed-financial-groups universe and corporate-strategy INDEX.

7. Counterpoints and Caveats

  • Election is a commitment, not a toggle. グループ通算 is opted into for the group and is not casually reversed; the decision interacts with each member’s loss position and forecast.
  • 遮断 is “in most cases,” not absolute. Certain group-level items and anti-abuse adjustments can still reach across companies; the ring-fencing is a major improvement, not a wall.
  • Two regimes, one group. Do not conflate the mandatory グループ法人税制 baseline with the elective グループ通算 add-on — they answer different questions (intra-group transfers/dividends vs profit-loss netting).
  • Anti-trafficking rules govern loss movement. Losses do not flow freely through restructurings; the same art. 57-series limits that constrain splits and mergers constrain what a 通算 group can ultimately use.
  • Rules evolve annually. Group-tax detail is adjusted by successive 税制改正; confirm current treatment against NTA guidance before relying on specifics.

Sources

[!info] 校核状态 confidence: likely. The replacement of 連結納税制度 by グループ通算制度 effective for fiscal years beginning on/after 1 April 2022, the retention of 損益通算, the shift to per-company filing with 遮断 of corrections, the 完全支配関係 scope, and the distinction from the mandatory グループ法人税制 baseline are confirmed against NTA materials. Detailed mechanics (loss-allocation, entry/exit mark-to-market, anti-trafficking interaction) are technical and revised by annual 税制改正 — confirm current treatment per NTA guidance and specialist advice.