The decision to sell is one of the hardest in investing. Market drops create panic. Gains create greed. Most investors sell at the wrong time — locking in losses in crashes and missing recoveries. Here’s a framework for making disciplined selling decisions in a NZ context.
Good reasons to sell: rebalancing, funding a specific planned goal, the investment thesis has fundamentally changed. Bad reasons to sell: the market dropped, you're nervous about the news, a friend said to sell, the price is up and you want to "lock in gains." NZ has no capital gains tax on most investments, but selling triggers income tax if IRD classifies you as trading on revenue account. PIE managed funds don't trigger tax when you redeem units.
The Core Problem: Emotional Selling
Research consistently shows that individual investors buy high and sell low — the opposite of what creates returns. The reason: emotions.
The emotional selling cycle:
- Market rises → confidence grows → buy more
- Market drops → fear grows → sell (“stop the bleeding”)
- Market recovers → FOMO → buy back higher than you sold
The cost of emotional selling: A NZ investor who sold their KiwiSaver or index fund in March 2020 (COVID crash, −35% in weeks) and didn’t re-enter until the market had recovered would have permanently locked in those losses. The NZX 50 recovered to pre-COVID levels within 12 months.
Good Reasons to Sell
1. Rebalancing to target allocation
Your portfolio has drifted significantly from its target — e.g., global equities grew from 70% to 85% of your portfolio. Selling some global equities to rebalance to 70% is rational and disciplined.
Better approach first: redirect new contributions to underweight assets rather than selling (avoids tax). But if contributions are too small to rebalance via contributions alone, selling is justified.
2. Funding a specific planned goal
You set a 10-year goal, invested for 10 years, and now need the money for its intended purpose (house deposit, education, retirement spending). This is exactly why you invested — sell according to plan.
Key point: Have a plan before you invest. Know the time horizon. Selling to fund a pre-planned goal is disciplined, not reactive.
3. The investment thesis has fundamentally changed
For individual stocks: you bought because of specific business qualities (competitive position, management, industry tailwind). If those fundamentals have genuinely, materially changed — not just the price — reassessment is warranted.
Examples of genuine thesis change:
- Management team replaced with poor track record
- Core business disrupted (technology makes product obsolete)
- Balance sheet becomes dangerously leveraged
- Regulatory change makes the business model unviable
Not a thesis change: The stock price dropped. The market is down. A journalist wrote something negative. Short-term earnings missed by 5%.
4. Tax loss harvesting (non-PIE investments)
If you hold non-PIE investments at a loss, selling to crystallise the loss can offset taxable gains elsewhere. This is relevant for direct shares and non-PIE ETFs.
Caution: NZ has no formal “wash-sale” rule, but IRD may look unfavourably on immediately repurchasing the same security. Get tax advice if doing this deliberately.
5. Concentration risk management
You’ve accumulated a large position in a single company — through employer shares, inheritance, or strong growth — and it represents more than 10–15% of your net worth. Reducing concentration is rational risk management, even if the company’s prospects remain good.
Bad Reasons to Sell
“The market is down” / panic selling
Markets drop. This is normal and expected. Since 1990, the NZX 50 has experienced:
- Multiple drops of 20–30% (recessions, financial crises)
- At least one drop of 40%+ (GFC 2008, COVID 2020)
- And recovered to new highs every time (so far)
Selling during a crash locks in losses and usually means buying back at higher prices. Unless your time horizon or financial circumstances have genuinely changed, a drop is not a reason to sell.
“I want to lock in gains”
The instinct to “take profits” is common but often counterproductive for long-term investors. If your investment thesis is unchanged and your time horizon is intact, selling simply to realise gains means:
- You pay tax on the gain (if taxable)
- You need to redeploy the money (into what?)
- You potentially miss further compounding
“Taking profits” makes sense when you need the money or are rebalancing — not as a reflex reaction to seeing your account balance rise.
“Everyone is talking about [X]”
If the reason you’re considering selling is something you read on Reddit, heard from a friend, or saw on the news — be very sceptical. Markets generally price in publicly available information. By the time it’s on the news, the market has likely already moved.
“It hasn’t moved in a year”
Index funds and diversified portfolios don’t always move uniformly. Waiting for a “laggard” to move and then selling is a form of recency bias. Assets that have underperformed recently often subsequently outperform (mean reversion).
NZ Tax Implications of Selling
PIE managed funds (InvestNow, Kernel, Simplicity)
When you redeem units in a PIE fund, no separate tax event is triggered. PIE funds pay tax on an accrual basis (income attributed annually). You can sell and receive proceeds without calculating a taxable gain.
Non-PIE direct shares (NZX stocks, US ETFs)
Selling direct shares may trigger income tax if IRD classifies your activity as “trading on revenue account.” NZ has no blanket capital gains tax, but:
- Frequent traders: IRD considers profits as income (taxable at marginal rate)
- Long-term buy-and-hold investors: Generally not taxable on sale — but no statutory exemption. The line is not always clear.
- Rule of thumb: If you buy shares intending to sell them for a profit, IRD may tax the gain. If you buy for dividends/long-term wealth, you have a stronger argument for non-taxability.
Seek advice if you’re selling large direct share positions — get a view from a tax accountant on whether the gain is taxable.
KiwiSaver
You cannot “sell” KiwiSaver investments voluntarily (except for first home withdrawal, significant financial hardship, or retirement at 65). Switching between KiwiSaver fund types (e.g., aggressive to balanced) is not a taxable event — the KiwiSaver provider handles tax within the scheme.
A Selling Decision Framework
Before selling, answer these questions:
- Why did I buy this investment? (What was the thesis?)
- Has anything fundamental changed? (Not the price — the underlying business or goal)
- What’s my time horizon? (Have I reached it? Has it changed?)
- Am I selling because of emotions or logic? (Fear/greed vs. plan)
- What will I do with the proceeds? (If you don’t have a better use, why sell?)
- What are the tax implications? (PIE vs non-PIE, trading vs investing)
If you can’t answer questions 1–3 clearly, wait. Make the decision when you have clear reasoning, not in the moment of market panic or euphoria.
The 24-Hour Rule
If you feel an urgent impulse to sell — write down the reason, then wait 24 hours. If the reason still holds and you still want to sell, proceed. This simple rule stops most emotion-driven selling decisions.
Frequently Asked Questions
Should I sell before a recession? Recessions are not predictable with enough precision to trade on. The market often bottoms before the recession officially ends. Investors who try to “sell before the recession” typically sell after significant falls and miss the recovery. Statistically, staying invested through recessions beats market timing for most retail investors.
Should I sell if I need the money in 1–2 years? Yes — money you need within 1–2 years shouldn’t be in equities regardless of market conditions. Equities can drop 30–40% and take years to recover. Move near-term funds to term deposits or savings accounts. See Term Deposits NZ for current rates.
If the FIF threshold is a concern, should I sell? If your direct overseas share holdings approach $50,000 NZD cost price, you should think carefully — not necessarily sell, but consider switching new contributions to PIE funds rather than growing the direct holding further. Selling to get under the threshold might trigger more tax than FIF itself. Get accountant advice for large amounts.