When a superannuation pension balance exceeds the $2 million Transfer Balance Cap, the excess transfer balance tax applies to notional daily earnings on the excess — at 15% for first events and 30% for subsequent events. The excess must also be commuted (reduced), with the commuted amount returning to accumulation phase or paid out. The tax is minimised by commuting promptly and monitoring the Transfer Balance Account regularly.
For Australian pre-retirees and retirees with substantial superannuation balances, the Transfer Balance Cap (TBC) is the lifetime limit on the amount of super that can be held in retirement-phase income streams — account-based pensions, annuities, and defined benefit pension equivalents. The cap is currently $2.0 million per person for 2025-26, with personal caps adjusting upward through indexation events. For most retirees, the cap sits comfortably above their actual super balance and is not a binding constraint. For pre-retirees and retirees with balances at or near $2 million, however, the TBC is one of the most consequential super law provisions in their planning, and the excess transfer balance tax that applies when the cap is exceeded is worth understanding clearly. The mechanism is not punitive in the usual sense — it does not tax the excess balance directly — but it does tax the notional earnings on the excess during the period it sits over the cap, plus any subsequent earnings until remediation, with rates that escalate for repeat occurrences.
The framework operates through the Transfer Balance Account (TBA) — an ATO-tracked record of credits and debits for each member. TBA credits occur when a retirement-phase income stream commences, equal to the value at commencement. TBA debits occur when an income stream is commuted (closed) or other specific events happen, equal to the value at the debit event. The TBA balance at any time is the cumulative net of credits and debits. Where the TBA balance exceeds the TBC, an excess transfer balance exists, and the excess transfer balance tax applies.
Several scenarios commonly produce an excess transfer balance. Commencing pensions over the cap — a member commencing pensions whose total value exceeds the TBC creates an excess on day one of commencement. Multiple pension commencements over time — members who commenced one pension at the historical TBC level (perhaps $1.6 million in 2017-18) and then commenced another later may inadvertently create an excess if cumulative credits exceed the current personal TBC. Reversionary pension on a partner's death — when a member's partner dies and a reversionary pension reverts to the survivor, the survivor's TBA receives a credit at the value of the pension on the date of death (with a 12-month delay before the credit is recognised); for surviving partners with substantial existing pension balances, the inherited pension can produce excess. Defined benefit pension valuation increases can produce excess in some scenarios. Indexation interaction — personal TBC indexation and pension balance growth can interact to produce excess for members close to the cap.
When an excess exists, two things happen. First, the member is required to commute the excess — reduce the pension balance by an amount sufficient to bring the TBA back within the cap, with the commuted amount returning to accumulation phase or being paid out as a lump sum. Second, the member must pay the excess transfer balance tax, calculated on notional earnings during the excess period.
The notional earnings calculation is technical. A daily rate based on the 90-day Bank Bill Swap Rate plus an uplift factor is applied to the excess balance for each day the excess existed. The cumulative notional earnings are taxed at 15% for first-time excess events and 30% for subsequent excess events. The rate increase for repeat events is intended to discourage members from repeated excess situations. The ATO calculates and assesses the tax based on TBA reporting from super funds, issuing an assessment that the member can elect to pay from super (via release authority) or personally.
The first remediation step is commutation of the excess. The commuted amount can be returned to accumulation phase within the same fund — staying inside super, taxed at 15% on earnings (versus 0% in pension phase), but preserving the funds for future deployment within the tax-favoured super structure. Alternatively, it can be paid out as a lump sum — leaving super entirely, generally tax-free for members over 60. For most members, returning to accumulation is the appropriate response — preserves the funds inside super at the lowest available tax rate, with the option to deploy them in the future (perhaps after subsequent TBC indexation creates new pension capacity).
Commutation should be timed to bring the TBA position back within the cap as quickly as practicable. Each day of excess contributes to the notional earnings calculation and the eventual tax bill. For members where the excess is identified promptly, the tax cost is modest. For members where the excess persists for months or years before identification, the cost can be substantial.
A specific feature worth understanding for couples is the 12-month reversionary pension TBA delay. When a reversionary pension reverts to a survivor, the TBA credit is delayed by 12 months from the date of death. The 12 months provides time for the survivor to plan — to commute their existing pension, to commute the reversionary pension, or to make other adjustments — before the formal TBA credit applies. For surviving partners with substantial existing pension balances and a reversionary pension nomination from the deceased, this 12-month window is the critical planning period. Used well, it allows orderly TBA management; missed, it can produce unintended excess and avoidable tax.
For pre-retirees with substantial super approaching the cap, several practical considerations apply. Plan pension commencement carefully — time the commencement to align with TBC indexation events where possible; calculate the commencement value with a small buffer to absorb market movement between calculation and execution. Use accumulation strategically — excess amounts in accumulation are taxed at 15% on earnings, still favourable compared with non-super investments at marginal rates; the structural use of accumulation for above-cap super is appropriate. Consider the recontribution strategy implications — for members converting taxable to tax-free component through commutation and recontribution, coordination with TBA position matters. Plan for death benefit and reversionary scenarios — for couples with substantial combined super, the impact on the survivor's TBA position is foreseeable and can be planned for. Review annually — TBA position changes with pension growth, drawdowns, and indexation; annual review catches issues before they become problematic.
A few common pitfalls. Not monitoring TBA position is the most basic — pre-retirees commencing pensions sometimes don't track their personal TBC and current TBA position, leading to inadvertent excess. Miscalculating commencement value — market movement between calculation and commencement can produce slight excess. Ignoring the 12-month reversionary window — surviving partners with substantial existing pension may need to take action before 12 months. Repeated excess events — each subsequent event attracts the higher 30% rate. Locking in lower personal TBC — members in continuous excess may miss subsequent indexation benefits.
For pre-retirees and retirees with substantial super, this is exactly the area where adviser-led monitoring and modelling pays for itself. The mechanism is technical but the consequences of getting it wrong are real and avoidable with appropriate planning.
Key takeaways
- The Transfer Balance Cap (TBC) is the lifetime limit on super held in retirement-phase income streams — $2.0 million per person for 2025-26. The ATO tracks each member's position through their Transfer Balance Account (TBA), a running ledger of credits (pension commencements) and debits (commutations). When the TBA balance exceeds the personal TBC, an excess transfer balance exists and the tax mechanism activates.
- Excess transfer balance tax is not levied on the excess capital — it is levied on notional earnings on the excess balance for each day the excess persists. The notional earnings rate is based on the 90-day Bank Bill Swap Rate plus an uplift. The rate is 15% for first excess events and 30% for all subsequent events. Each additional day of excess increases the tax bill, so prompt commutation matters.
- Common excess scenarios include: commencing pensions whose total value exceeds the TBC on day one; a surviving spouse receiving a reversionary pension when their existing pension already fills most of their personal TBC; multiple pension commencements over time where cumulative credits surpass the personal cap; and defined benefit pension valuation increases.
- When an excess is identified, the member must commute (reduce) the pension balance sufficiently to bring the TBA within the cap. The commuted amount can return to accumulation phase (taxed at 15% on earnings, still inside super) or be paid out as a lump sum (generally tax-free over age 60). Returning to accumulation preserves the funds in the tax-favoured super structure for future deployment.
- A reversionary pension triggers a TBA credit 12 months after the date of the deceased's death — not immediately. This 12-month window is critical planning time for a surviving spouse with a substantial existing pension balance. It allows commutation or restructuring before the formal credit is recognised, preventing inadvertent excess and the associated tax.
Frequently asked questions
What is the excess transfer balance tax?
The excess transfer balance tax is a tax on notional earnings that applies when a superannuation member's Transfer Balance Account (TBA) exceeds their personal Transfer Balance Cap (TBC). The TBC is currently $2.0 million for 2025-26. The tax is not levied on the excess capital itself — it is levied on a notional daily earnings calculation based on the 90-day Bank Bill Swap Rate applied to the excess balance for each day the excess persists. The rate is 15% for first-time excess events and 30% for subsequent events.
What commonly triggers an excess transfer balance?
The most common scenarios are: commencing retirement-phase pensions whose combined value exceeds the Transfer Balance Cap at commencement; a surviving spouse receiving a reversionary pension when their own pension balance already consumes most of their personal TBC (with the inherited pension credit recognised after 12 months); and multiple pension commencements over time where cumulative TBA credits surpass the personal cap. Members who commenced pensions when the historical TBC was lower (such as $1.6 million at introduction in 2017-18) and later commenced another pension are particularly at risk.
How is the excess transfer balance tax calculated?
The ATO calculates a daily notional earnings amount by applying a rate based on the 90-day Bank Bill Swap Rate (plus an uplift factor) to the excess TBA balance — the amount by which the TBA exceeds the personal TBC — for each day the excess exists. These daily notional earnings accumulate over the excess period and are then taxed at 15% (first excess event) or 30% (any subsequent excess event). The ATO issues a formal assessment, which can be paid from super via a release authority or from personal funds.
What should you do if you have an excess transfer balance?
The immediate step is to commute (reduce) the pension by enough to bring the TBA back within the personal TBC. This should be done as quickly as practicable — every additional day of excess increases the notional earnings and the eventual tax bill. The commuted amount can be retained inside super in accumulation phase (taxed at 15% on earnings rather than the pension phase 0%) or withdrawn as a lump sum (generally tax-free for members over 60). For most members with large balances, returning the excess to accumulation is the better outcome — funds remain inside the tax-favoured super environment.
How does a reversionary pension affect the Transfer Balance Cap?
When a member dies and their pension reverts to a surviving spouse or dependant under a reversionary nomination, the reversionary pension creates a TBA credit for the survivor equal to the pension value at the date of death. Importantly, this credit is not recognised in the TBA until 12 months after the date of death — giving the survivor a planning window. Surviving spouses with substantial existing pension balances need to use this window to review their TBA position and commute either their existing pension or the reversionary pension if the combined total would exceed their personal TBC.