One of the most practical term deposit decisions: should you lock in for 12 months (or longer) to capture a higher rate, or stay short (30–90 days) to maintain flexibility?
In a falling rate environment (rates expected to drop), lock in longer — you capture today's higher rate before it falls. In a rising rate environment (rates expected to rise), stay short — rolling over lets you benefit from rising rates at each renewal. In mid-2026 (RBNZ rates stabilising after 2024–2025 cuts), the 6–12 month range offers the best rate-to-flexibility trade-off for most investors.
Why Term Matters: The Rate-Duration Trade-Off
Banks typically pay more for longer-term deposits — they want the certainty of holding your funds longer. But not always: sometimes short-term rates are higher (inverted yield curve), particularly during rate-cut cycles.
Mid-2026 NZ rate environment: The RBNZ began cutting rates in late 2024 and continued through 2025. By mid-2026, the OCR has stabilised. Term deposit rates have followed, with 6-month and 12-month rates both in the 4.0%–4.8% range. Rates are no longer obviously falling — the inverted yield curve of 2022–2023 has mostly normalised.
Rate Comparison by Term (Mid-2026 Indicative)
| Term | Indicative rate range | Best for |
|---|---|---|
| 30 days | 3.5%–4.0% | Maximum flexibility, lowest return |
| 90 days | 4.0%–4.5% | Short-term parking, quarterly access |
| 6 months | 4.2%–4.8% | Good balance of rate and flexibility |
| 12 months | 4.0%–4.5% | Locks in rate, slightly lower than 6-month in NZ |
| 24 months | 3.8%–4.3% | Useful if you believe rates will fall further |
| 5 years | 3.5%–4.0% | Rarely optimal — very long commitment |
In NZ, 6-month term deposits have often offered slightly higher rates than 12-month rates — an unusual pattern reflecting the inverted yield curve that has partly persisted.
When to Choose Short-Term (30–90 Days)
You may need the money soon. If there’s any chance you’ll need these funds within 3 months, don’t lock in longer.
You expect rates to rise. If you believe the RBNZ will raise rates again (or not cut further), short-term rolling lets you capture the higher rate at each renewal.
It’s your emergency fund overflow. Funds that might be needed quickly should stay short (or in a savings account).
You’re building a ladder. The short-term tranches of a term deposit ladder are intentionally short.
When to Choose Long-Term (12–24 Months)
You don’t need the funds. Money you won’t need for 12–24 months can be locked in for the rate certainty.
Rates are expected to fall. If the RBNZ is in a cutting cycle, locking in 12–24 months protects you from future rate falls. Once you’ve locked in 4.5% for 24 months, a drop to 3.0% rates doesn’t affect your return.
You want predictability for income planning. Retirees drawing a known income from deposits benefit from knowing exactly what interest they’ll receive — a 12-month term at a fixed rate delivers that.
The rate curve favours it. When 24-month rates are meaningfully higher than 6-month rates, the rate premium can justify the lock-in.
The 6-Month Sweet Spot
In many NZ rate environments, the 6-month term offers the best rate-to-flexibility ratio:
- Higher rate than 30–90 day deposits
- Shorter commitment than 12–24 months
- Maturing frequently enough to reinvest as rates change
A simple strategy for most investors: ladder across 3-month, 6-month, and 12-month terms — you get average rates above the short end while maintaining quarterly liquidity.
Rate Direction: How to Think About It
No one reliably predicts interest rate movements. But you can use the current situation to inform your term choice:
| RBNZ signal | Suggested approach |
|---|---|
| Rates on hold, neutral outlook | 6–12 month terms — sweet spot |
| Rates likely to fall further | Lock in 12–24 months before cuts arrive |
| Rates likely to rise | Stay short (30–90 days), rollover to capture rising rates |
| Rates very uncertain | Ladder across multiple terms |
As of mid-2026, with the RBNZ having normalised rates and signalling stability, the 6–12 month range is most commonly recommended by NZ financial commentators.
Comparing Total Return: Short vs Long
Example: $30,000 over 12 months
| Strategy | Rate | Total interest |
|---|---|---|
| 12-month deposit (lock in) | 4.3% | $1,290 |
| Two 6-month deposits (roll at same rate) | 4.5% each | $1,350 |
| Four 3-month deposits (roll at same rate) | 4.0% each | $1,200 |
Assumes rates don’t change between rollovers — illustrative only.
In this example, two 6-month deposits slightly outperform the 12-month rate. But if rates fall 0.5% at the second 6-month renewal, the 12-month lock-in wins.