Kiwisaver for Weight Loss Surgery (2025 Guide)

Yes — in many cases you can.

New Zealanders can access their KiwiSaver early if weight loss surgery is considered medically essential or if they face significant financial hardship.

There are two pathways:

1) Medical Grounds

Providers approve withdrawal if:

• BMI is 35+

• You have diabetes, high blood pressure, and sleep apnea

• Your daily life or long-term health is affected

• Your GP confirms surgery is medically necessary

2) Financial Hardship

Approved when you:

• Cannot meet essential living costs

• Cannot afford surgery otherwise

• Have no other realistic funding options

👉 Most successful applications include both medical need + financial hardship.

Weight loss surgery is expensive in NZ. People turn to Kiwisaver because:

• Insurance rarely covers bariatric surgery

• Private surgery costs $14k–$30k

• Weight-related conditions get worse over time

• Early treatment improves long-term health

Remember, you might need to take some time off from work or school, which could mean less money coming in.

Plus, after losing weight, some people have extra skin that needs to be removed through another surgery. It sounds like a lot, but it's worth it in the long run.

To qualify for early withdrawal, you must show:

✔ Medical necessity

Your GP must confirm surgery is essential.

✔ Supporting medical documents

• GP letter

• Specialist notes (if any)

• BMI & health reports

• Comorbidity evidence

✔ Financial hardship (optional but helpful)

• 3 months bank statements

• Income & expense proof

• Surgery cost quote

✔ No alternative funding

Providers may check:

• Savings

• Loan options

• Insurance possibilities

• Sellable assets

📌 This is the most common rejection point.

Required documents:

• GP medical letter

• Clinic quote/invoice

• ID copy

• Bank statements (3 months)

• Income/expense summary

• Evidence of comorbidities

Optional but helpful:

• Specialist letters

• Previous treatment records

You can withdraw most of your KiwiSaver balance, except:

• Government contributions (up to $1,000)

• A small provider-required remaining balance

Typical ranges:

• Gastric Sleeve → $14,000–$25,000

• Gastric Bypass → $19,000–$30,000

Withdraw only the surgery amount — not the full balance.

Step 1 — Get a GP Medical Letter

It must include:

• BMI

• Comorbidities

• Failed non-surgical attempts

• Risks of delaying surgery

Step 2 — Get a Quote from a Clinic

Clinic estimate must list:

• Type of surgery

• Total cost

• Clinic details

Step 3 — Download Your Provider’s Form

Each provider has its own form:

Milford, Booster, Simplicity, AMP, ANZ, Fisher Funds.

Step 4 — Prepare Your Documents

• Identity verification

• 3–6 months bank statements

• Income & expense summary

• Medical letters

• Surgery cost quote

Step 5 — Submit Your Application

Common submission methods:

• Provider online portal

• Email

• Physical submission (rare)

Step 6 — Approval Timeline

• Medical: 5–15 working days

• Hardship: 10–20 working days

Missing documents = delays.

A strong GP letter massively increases approval chances.

It must include:

• Diagnosis & BMI

• Relevant health conditions

• Why surgery is medically required

• Risks of delaying treatment

• Expected improvement post-surgery

Suggested Wording:

“In my medical opinion, bariatric surgery is clinically indicated and medically necessary for this patient. Without surgical intervention, the patient’s condition is likely to deteriorate. Non-surgical treatments have been attempted without adequate improvement.”

❌ GP letter too vague

→ Fix: add BMI, comorbidities, failed attempts.

❌ Insufficient financial documents

→ Fix: include full income/expense details.

❌ Requesting full Kiwisaver balance

→ Fix: request only the surgery amount.

❌ Missing documents

→ Fix: GP letter + quote + bank statements.

❌ Provider thinks you can access alternative funding

→ Fix: explain why loans/insurance aren’t viable.

Milford

• Approves medically essential surgeries

• 5–10 days

• Hardship requires more documentation

Booster

• Flexible on medical withdrawals

• 7–12 days

• Often requires specialist notes

Simplicity

• Strictest financial checks

• 10–20 days

• Requires full budget outline

AMP

• Accepts medical withdrawals

• 10–15 days

• Often asks for proof insurance won’t cover surgery

Fisher Funds

• Straightforward medical criteria

• 7–14 days

ANZ

• Commonly requests detailed medical notes

• 8–15 days

Can you use Kiwisaver for Gastric sleeve?
Yes, if medically necessary.

Do you need a GP letter?
Yes — mandatory.

How much can you withdraw?
Enough to cover surgery costs.

Does every provider allow medical withdrawals?
Most do, but rules differ.

How long does it take?
5–15 working days on average.