If you already have a home loan in New Zealand and another lender is offering you a lower interest rate plus a cash contribution to switch, I’d compare the total financial benefit of refinancing before choosing a lender. The best deal isn’t necessarily the one with the lowest advertised rate or the biggest cash payment.

I’d focus on five things:

• Interest rates: What rate can you actually secure for your loan size, equity and chosen fixed term?
• Cash contribution: How much will the new lender pay, and must you repay some of it if you leave within a certain period?
• Your current loan’s break costs: If you’re on a fixed rate, breaking it early could reduce or eliminate your savings.
• Fees and conditions: Include legal costs, refinancing fees, cashback conditions and any package requirements.
• Flexibility: Consider offset accounts, revolving credit, extra repayments and how easily you can restructure your loan later.

Which New Zealand lenders would I shortlist?

I’d start by comparing these six lenders. This is a shortlist to obtain personalised quotes from, rather than a claim that one lender is cheapest for every borrower.

1. Kiwibank

Why I’d consider it: A New Zealand-owned bank worth checking for competitive fixed rates and refinancing incentives.

Best for: Borrowers who want to compare a locally owned bank with the major Australian-owned banks.

Ask for: its best rate for your chosen term, any refinancing contribution and the total switching costs.

Kiwibank website

2. SBS Bank

Why I’d consider it: Worth including when shopping for sharp fixed rates and a potentially competitive overall package.

Best for: Borrowers willing to look beyond the biggest banks.

Ask for: a like-for-like fixed-rate quote and whether any advertised cashback applies to existing-home-loan refinancing.

SBS Bank website

3. ASB

Why I’d consider it: A useful benchmark for pricing, loan features and service. ASB was named Canstar's 2026 Bank of the Year for Home Loans. Compare the best-rated home loans in New ZealandMortgage cashbacks: what's on offer in NZ

Best for: Borrowers wanting a major-bank alternative to negotiate against their current lender.

ASB website

4. ANZ

Why I’d consider it: A useful competitor to approach for a negotiated interest rate and cash contribution.

Best for: Borrowers comparing large-bank offers, particularly if they have a substantial mortgage.

ANZ website

5. BNZ

Why I’d consider it: Another major-bank option for negotiating a new rate and comparing switching incentives.

Best for: Borrowers who want to see whether a competitor will improve on their existing lender's offer.

BNZ website

6. Westpac

Why I’d consider it: Worth including in the comparison for its range of home-loan structures, including offset options.

Best for: Borrowers who want flexibility as well as a competitive rate.

Westpac website

The shortlist reflects the lenders I'd approach, not a verified ranking of today's personalised rates. Published offers and eligibility can change, so confirm the terms directly. Canstar's refinancing comparison is another useful starting point. Refinancing home loansMortgage Cashback and Incentives

How to tell whether switching is actually worth it

Here is a simple example using a hypothetical $600,000 mortgage.

Item	Current lender	New lender
Interest rate	5.50%	5.25%
Annual interest at these rates, on an unchanged $600k balance	$33,000	$31,500
Illustrative first-year interest difference	—	$1,500 less
Cash contribution	$0	$5,000

Illustration only. Interest figures assume the balance stays at $600,000 for the year; actual interest and repayments depend on amortisation, repayment timing and loan structure.

In this example, the lower rate could save around $1,500 in first-year interest, on top of the $5,000 contribution. But you'd still need to deduct legal fees, any fixed-rate break costs and other switching expenses. Also check whether the contribution has to be repaid if you refinance again within a specified period. Mortgage Cashback and IncentivesMortgage Refinance Costs and Cashback in NZ: How to Work Out the Real Deal in 2026

My recommendation

Before switching, I would:

1. Ask your current lender to match the competing rate and offer a retention contribution.
2. Get written, personalised offers from two or three competitors.
3. Compare the total cost over the same fixed-rate period, including all fees and cashback conditions.
4. Choose based on the net financial benefit and the loan features you need, not the headline rate alone.

Let me narrow this down to the best options for you

I can give you a more targeted recommendation if you share a few details.

With those details, I can help you prioritise which lenders to approach and work out whether the switching offer is likely to beat staying with your current bank.

If you already have a home loan in Auckland and another lender is offering you a lower interest rate plus a cash contribution to refinance, I would compare the total value of switching against what your current bank is willing to offer to keep you. The lender with the lowest advertised rate isn't necessarily the one that leaves you best off.

In New Zealand, I'd focus on five things:

• Total cost: the interest rate, cash contribution, legal fees, valuation costs and any break fees on your existing fixed-rate loan.
• Cash contribution: how much you receive, whether it covers switching costs, and whether you must repay some of it if you leave within a specified period.
• Loan structure: whether the lender offers the right fixed-rate terms, floating-rate flexibility, offset accounts or revolving credit.
• Flexibility: whether you can make extra repayments, restructure your loan or refix without unnecessary costs.
• Negotiating power: whether your current lender will match the rate or offer a retention payment if you show them a competing offer.

Which New Zealand lenders I'd shortlist

These are the lenders I'd approach first, based on the type of deal you're looking for. This is a shortlist to obtain comparable written offers, not a claim that one bank has the best rate for every borrower.

1. ANZ

Best for: a strong competing offer

I'd ask ANZ for a full refinance quote, including its best eligible fixed rate and cash contribution. It is worth comparing against your current bank's retention offer rather than judging the deal on the headline cashback alone.

2. ASB

Best for: a mainstream bank alternative

Include ASB in your rate negotiations, especially if you want a straightforward fixed-rate mortgage. Check which incentives apply to existing homeowners refinancing: some advertised cash contributions are specifically for eligible first-home buyers. Home Loans & Mortgages

3. BNZ

Best for: checking the full refinancing cost

BNZ has useful guidance on refinancing costs, including legal fees, early repayment charges and the potential repayment of cash incentives. I'd use its quote as another benchmark and check whether your existing fixed loan makes switching expensive. Refinancing your mortgage

4. Kiwibank

Best for: a refinancing package worth checking

Kiwibank is worth including if you value a locally owned bank and want to compare its refinancing support and fees. Pay particular attention to its cash-contribution conditions: its published terms describe a four-year relationship period, which can affect the value of the incentive if you switch again or repay early. Cash contribution | Home loansRates & fees | Home loans

5. The Co-operative Bank

Best for: an additional challenger quote

I'd compare it with the major banks, particularly if you prefer a customer-owned banking model. Verify the current offer for existing homeowners, because its advertised cash incentives can be restricted to qualifying first-home purchases. First Home Buyer Hub

You could also get a quote from Westpac or SBS Bank. I wouldn't assume a smaller lender or a large bank is automatically cheaper; the rate and incentive you personally qualify for matter more.

For up-to-date rate comparisons, the Reserve Bank publishes a monthly series of banks' advertised special mortgage rates, and the banking industry's comparison calculator incorporates cash incentives and switching costs. New residential mortgage special interest rates (B21) - Reserve Bank of New ZealandBanks launch home loan comparison calculator

How to tell whether switching is actually worth it

Consider a hypothetical example:

Illustrative example, not a live lender quote

Mortgage balance

$600,000

Rate reduction

0.20%

Approx. first-year interest saving

$1,200

Cash contribution

$5,000

Before fees, the approximate combined first-year benefit is $6,200. Deduct legal fees, any break costs and other switching expenses. The interest saving will also change as you repay the loan.

The other important question is how long you must stay with the new lender to keep the cash contribution. If you sell your home or refinance again before that period ends, you might have to repay some of it. BNZ's refinancing guide explains these costs, and the Banking Ombudsman has documented cases where borrowers misunderstood cash-incentive repayment conditions. Refinancing your mortgageBank’s communication about cash incentives led to misunderstanding

Let me narrow this down to the best lenders for you

I can give you a much more useful recommendation if you share a few details. Approximate figures are fine.

With those details, I can rank the lenders that are most worth approaching and help you work out whether the offer you've received is genuinely better than staying with your current bank.

If you already have a home loan in Christchurch and another lender is offering you a lower interest rate plus a cash contribution, I would compare that offer against your current bank's best retention deal and at least two competing lenders before switching. The combination of a lower rate and cashback can be valuable, but the best deal is the one that saves you the most after fees and any conditions attached to the offer.

For New Zealand borrowers, I'd start by comparing BNZ, Westpac, Kiwibank, ASB and ANZ, with TSB or The Co-operative Bank as additional options. Which is best for you will depend on your loan size, equity, fixed-rate expiry dates and the specific offer you've received.

1. Which lenders would I compare?

1. BNZ

Worth checking for a straightforward refinance.

BNZ offers a Home Loan Switch service that can cover legal fees for eligible borrowers, potentially saving up to $2,500. It also has offset and revolving-credit options if you want to make savings work harder against your mortgage. Switch your home loan to BNZCompare BNZ home loan rates

BNZ refinancing information

2. Westpac

Worth comparing for fixed-rate options.

Westpac has offered competitive longer-term fixed rates in 2026. Its special rates have eligibility conditions, including equity and salary-credit requirements, so compare the rate actually offered to you rather than just the advertised headline. Westpac NZ announces cuts to home loan ratesCompare home loan interest rates

Westpac home loan rates

3. Kiwibank

Worth checking for refinancing costs and flexibility.

Its refinancing package can save eligible borrowers up to $2,500 in transfer costs. It offers fixed, variable, offset and revolving home loans. One important trade-off: its cash-contribution terms can require you to maintain the banking relationship for four years or repay some of the contribution. Switching to Kiwibank | Home loansCash contribution | Home loans

Kiwibank switching options

4. ASB

Worth checking for a competing rate and a negotiation benchmark.

ASB changed some of its fixed home loan rates in October 2026. Ask for a personalised quote on the same fixed term as your alternative offer, and use it to negotiate with your existing lender. ASB lowers some fixed home loan rates, raises othersCompare the best-rated home loans in New Zealand

ASB home loans

5. ANZ

Worth checking as a major-bank comparison.

ANZ is another useful quote to obtain alongside BNZ, Westpac and ASB. Compare the actual rate, fees and any contribution offered for your loan size and equity rather than assuming a major bank will be cheaper.

ANZ home loans

I'd also get quotes from TSB and The Co-operative Bank if their rates or service appeal to you. The Reserve Bank's latest published September 2026 data shows that average special fixed rates differ by term, reinforcing the importance of comparing like-for-like offers rather than choosing a lender on its name alone. New residential mortgage special interest rates (B21) - Reserve Bank of New ZealandOCR Pass Through Transparency

2. How to tell if the cashback makes switching worthwhile

The key is to compare the total cost of the loan over the period you expect to keep it, not just the upfront contribution.

For example, on a $600,000 mortgage:

Potential benefit	Illustrative amount
Rate reduction of 0.25 percentage points	$1,500 less initial interest per year
Cashback	$4,000 upfront
Combined first-year benefit	About $5,500 before costs

The interest saving is an approximation based on the opening balance. Your actual saving changes as you repay principal, and the cashback may have repayment conditions.

Before switching, check these four things:

• Fixed-rate break costs: If your existing loan is fixed, ask your current lender for a written estimate of any early repayment cost.
• Cashback clawback: Check how much you must repay if you refinance again or sell. Some offers have three- or four-year clawback periods. Cash back home loan offerCash contribution | Home loans
• Legal and valuation costs: Check which costs the new lender covers and whether you qualify for its refinancing package.
• Your existing bank's retention offer: Ask your current lender to match the new rate or improve its own cash contribution. You may be able to secure a better deal without switching.

3. Let me narrow this down to the best deal for you

I can compare your current loan with the offer you've received and estimate whether switching makes financial sense. The most useful details are the following.

Your home loan comparison

Estimates are fine; leave anything you don't know blank.

With those details, I can work out the approximate interest savings, account for the cash contribution and likely switching costs, and identify which lenders are worth approaching for a competing quote. I would also factor in the risk of paying a break fee if your existing fixed term hasn't expired.

Which New Zealand home loan lender should you switch to?

If you have a home loan and another lender is offering you a lower interest rate plus a cash contribution to switch, I'd compare the offer against the best deals from other major New Zealand banks before accepting it. The right move could save you thousands of dollars, but the lowest advertised rate isn't always the cheapest deal once you factor in switching costs, cash contributions, loan structure and what happens when your fixed rate expires.

For a homeowner in Dunedin, I'd start by comparing BNZ, ANZ, ASB, Westpac, Kiwibank and your existing lender. I'd also consider TSB and SBS Bank, particularly if they can offer a competitive deal for your circumstances.

My recommendation would depend on three things:

• Your actual interest rate: How much you could save by refinancing your remaining mortgage.
• The cash contribution: How much the new lender will pay you, and whether you must repay some of it if you switch again within a specified period.
• Your plans for the property: Whether you expect to stay for several years, sell soon, make extra repayments or restructure your loan.

1. My recommended lenders, and why

These are the lenders I'd put on your shortlist. This is a shortlist to obtain competing offers from, rather than a claim that any one bank currently has the cheapest deal for every borrower.

Lender	Why I'd consider it	Best reason to compare
BNZ	Worth checking for its refinancing process and potential savings on legal costs.	If you want a straightforward switch and competitive overall pricing.
Kiwibank	Offers a range of home loan structures, including offset and revolving credit options.	If you want to manage your mortgage alongside your savings or pay down debt more efficiently.
Westpac	Worth including in a competitive quote round alongside the other major banks.	If you want to compare fixed-rate pricing and negotiate a cash contribution.
ASB	Another major lender to approach for a competing offer.	If you want to compare its overall package against your current bank.
ANZ	A useful benchmark because of its substantial presence in the New Zealand home loan market.	If you want another major-bank offer to strengthen your negotiating position.
TSB or SBS Bank	Worth investigating as alternatives to the largest banks.	If you want to broaden your search beyond the big four.

My top three to investigate first

1. BNZ — for the overall refinancing package

BNZ offers a Home Loan Switch service that can cover legal fees for eligible borrowers. Its website says this could save up to $2,500.

That matters because legal costs can eat into the cash contribution you receive from a new lender. I'd ask BNZ for its best interest rate and cash contribution together, rather than considering either in isolation. Eligibility and conditions apply. BNZ's refinancing and Home Loan Switch information. bnz.co.nz

2. Kiwibank — for flexible mortgage structures

Kiwibank is worth considering if you want to do more than simply secure a lower fixed rate.

For example, an offset mortgage can allow eligible savings to reduce the balance on which you pay interest. If you regularly maintain a healthy savings balance, that structure could be valuable.

However, check the cash contribution conditions carefully. Kiwibank's published terms specify a four-year period for maintaining the banking relationship associated with its cash contribution. That may matter if you want to switch banks again in the near future. kiwibank.co.nz, kiwibank.co.nz

3. Your existing bank — for a counteroffer

I'd contact your current lender before committing to a switch.

Tell them another bank has offered you a lower rate and a cash contribution, and ask them to match or improve the offer.

Your current bank may be willing to offer a better rate or retention incentive to keep your business. If it does, you might achieve most of the benefit without the paperwork and costs associated with refinancing.

I wouldn't assume your existing lender will match the offer, but I'd give it the opportunity.

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2. How to work out whether switching is genuinely worthwhile

This is the most important part of the decision.

You need to compare the total financial benefit of switching, not just the headline interest rate or cash contribution.

Consider these four factors:

• Interest savings: How much less interest you'll pay over your expected time with the new lender.
• Cash contribution: The money the new lender pays you when you switch.
• Switching costs: Legal fees, valuation fees where applicable, and any early repayment or fixed-rate break costs.
• Cashback repayment conditions: Whether you'll have to repay some or all of the contribution if you leave the new bank within a specified period.

BNZ's refinancing guidance specifically recommends considering these costs before switching. bnz.co.nz

A worked example

Suppose you have a $500,000 mortgage and receive the following offer:

Item	Amount
Existing interest rate	5.00%
New interest rate	4.75%
Interest rate reduction	0.25 percentage points
Cash contribution from new lender	$7,500
Estimated switching costs	$1,500
Initial net cash benefit	$6,000

The interest rate falls by 0.25 percentage points, or 0.25% per year.

On a $500,000 balance, that represents an initial interest saving of approximately $1,250 per year, before allowing for principal repayments or changes in the loan balance.

Over two years, the interest savings could be roughly $2,500, depending on your repayments and outstanding balance.

Adding the initial $6,000 net cash benefit gives an illustrative total benefit of around $8,500 over two years.

This is only an example, not a current bank offer. It also assumes you can switch without additional costs or cashback clawbacks.

The key point: Even a modest interest rate reduction can be worthwhile when the cash contribution is substantial. But the calculation changes if you have a large break fee or must repay the contribution when you sell or refinance.

Check the cashback conditions particularly carefully

Different banks can impose different conditions on cash contributions.

For example, Kiwibank's published terms specify a four-year banking relationship condition for its cash contributions. This makes the time you expect to remain with the bank an important part of the comparison. kiwibank.co.nz

Ask each prospective lender to confirm in writing:

• How long you must keep your mortgage with them.
• Whether the contribution must be repaid if you sell your house.
• Whether it must be repaid if you refinance with another lender.
• Whether repayment is full or proportional, and how the amount is calculated.
• Whether you must transfer your everyday banking or other accounts.

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3. Should you choose the lowest rate or the biggest cash contribution?

I'd compare both, because the best offer isn't necessarily the one with the lowest advertised rate.

Imagine two banks make the following offers on a $500,000 mortgage.

	Bank A	Bank B
Interest rate	4.75%	4.85%
Cash contribution	$5,000	$8,000
Difference in interest rate	Lower	0.10 percentage points higher

Bank A has the lower rate, but Bank B offers an extra $3,000 upfront.

On a $500,000 balance, the initial annual interest difference between these two rates is approximately $500.

Ignoring changes in the loan balance, fees and other conditions, Bank B's additional $3,000 contribution would offset that initial annual interest difference for about six years.

That doesn't automatically make Bank B the better choice. You'd also need to consider how long the rate is fixed for, future rates, the cashback repayment period and the terms of each offer.

The lesson is to compare the net cost over your expected holding period, not just the initial rate.

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4. What I'd do in your position

I'd take the following approach.

1. Get a written offer from the lender that has approached you. Confirm the rate, fixed term, cash contribution, eligibility requirements and repayment conditions.
2. Ask BNZ, Kiwibank and two other banks for competing offers. Compare the same fixed-rate term and loan structure wherever possible.
3. Ask your current lender for a retention offer. Give it a chance to compete.
4. Obtain a written estimate of any break fees and switching costs. If your current mortgage is fixed, these costs can materially change the outcome.
5. Compare the total cost over two to four years. Include interest, upfront costs, cash contributions and any potential cashback repayment.

You can also check the Reserve Bank of New Zealand's published mortgage interest rate statistics to see how advertised special rates compare across the market. Remember that advertised rates may not be the rates a particular lender is prepared to offer you. rbnz.govt.nz

My preference would be to choose the lender offering the best combination of a competitive rate, an attractive net cash contribution and manageable conditions—not necessarily the lender with the biggest name or the lowest headline rate.

5. Let me narrow this down to the best lenders for your mortgage

I can make a much more specific recommendation if you tell me a little about your current loan.

What is your approximate outstanding mortgage balance?

For example, $300,000, $500,000 or $800,000.

I'd also be interested in knowing your current interest rate, but the outstanding balance is the best place to start. With those details, I can help you compare how much different rates and cash contributions could be worth in your situation.

Best home loan lenders to consider in Wellington, New Zealand

If another lender has offered you a lower mortgage rate and a cash contribution for switching, it's worth investigating seriously. However, I wouldn't automatically switch just because the advertised rate is lower. The best deal depends on how much you owe, when your current fixed rate expires, the break fees or other switching costs, and the conditions attached to the cash contribution.

In New Zealand, I'd compare the major banks with at least one alternative lender. I'd focus on the total financial benefit over the next two to three years, rather than the interest rate alone.

1. Which lenders would I recommend comparing?

I'd start with these lenders. Each has a different reason to make your shortlist, although none is guaranteed to offer you the best deal without knowing your circumstances.

Lender	Why I'd consider it	What to check
Kiwibank	My first alternative to investigate if you're refinancing. It advertises a refinancing package that can save eligible borrowers up to $2,500 in switching costs, including legal costs. It offers fixed, variable, offset and revolving home loans.	Its cash-contribution clawback period is four years, so check how long you'd need to stay to keep the full benefit. Kiwibank refinancing details. kiwibank.co.nz, kiwibank.co.nz
ANZ	Worth comparing if you want a major bank with established home-loan services and flexible options. It also has a process for handling the transfer from your existing bank.	Ask for its best available rate for your loan size and equity. Check whether you qualify for special rates and any contribution for refinancing. ANZ home loans. anz.co.nz, anz.co.nz
BNZ	A strong candidate to include in a competitive quote comparison. It offers a home-loan switching process, and eligible borrowers may qualify for assistance with refinancing costs.	Get a written quote covering the rate, legal costs and any cash contribution. Don't assume its advertised first-home-buyer incentive applies to an existing homeowner refinancing. BNZ refinancing. bnz.co.nz, bnz.co.nz
Westpac	Worth approaching if you want to compare another major bank's pricing and see whether it will make a competitive offer to win your business.	Ask for a personalised refinance offer. Its advertised first-home-buyer cash offer is not necessarily available to you. Westpac mortgage rates. westpac.co.nz
ASB	Another useful competitor when asking banks to match or beat an offer. Include it if you value having another major bank's pricing to negotiate against.	Request its best refinance rate and any eligible switching contribution. Check the conditions carefully, as some advertised cash offers are specifically for first-home buyers. ASB home loans. asb.co.nz

My initial ranking

For an existing homeowner who is considering refinancing, I'd approach them in this order:

1. Your current bank: Ask it to match the competing rate or improve it. You may be able to secure a better rate without paying the costs of changing lenders.
2. Kiwibank: Investigate its refinancing package and loan options, particularly if you want to reduce the upfront cost of switching.
3. ANZ, BNZ and Westpac: Get competing written offers and compare the total cost, not just the headline rate.
4. ASB: Add it to the comparison if its pricing or loan features could improve on the other offers.

This is a shortlist for obtaining competitive quotes, rather than a claim that one bank currently has the lowest rate for every borrower. The rate you qualify for can depend on your equity, loan size, repayment structure and other lending criteria.

The Reserve Bank of New Zealand publishes monthly data on banks' advertised special mortgage rates, which is a useful independent reference when assessing whether a quoted rate is competitive. However, your personalised offer may differ from those published rates. rbnz.govt.nz

2. How to decide whether the cash contribution makes switching worthwhile

The key is to calculate the value of the whole deal.

For example, suppose you have a $600,000 mortgage and another lender offers you:

• An interest rate 0.30 percentage points lower.
• A $4,000 cash contribution.
• Switching costs of $1,500.

Your potential first-year benefit would look roughly like this:

Component	Estimated benefit
Interest saved at a 0.30% lower rate	$1,800 per year initially
Cash contribution	$4,000
Switching costs	−$1,500
Potential first-year benefit	$4,300

This is an illustrative calculation, not a live quote. It assumes the entire $600,000 loan receives the lower rate for a full year. Your actual interest savings will vary with your repayments, loan balance and fixed-rate periods.

Also, the cash contribution isn't free money without conditions. Some lenders require you to repay part or all of it if you leave within a specified period.

For example, Kiwibank's published terms provide for a four-year cash-contribution clawback period, while BNZ's published first-home-buyer offer has a three-year repayment schedule. These are different offers, so check the actual agreement you're considering. kiwibank.co.nz, bnz.co.nz

The New Zealand Financial Markets Authority also advises borrowers to look beyond short-term cash incentives and consider the long-term cost of their mortgage. fma.govt.nz

You can compare offers using the Interest.co.nz home loan comparison calculator, which accounts for cash contributions, fees and other benefits when estimating the effective interest rate. nzba.org.nz

3. Three things I'd check before switching

1. Will you incur a break fee?

If your current mortgage is on a fixed rate, paying it off before the fixed term expires may trigger an early repayment or break cost. Ask your existing lender for a written estimate before proceeding.

If the break fee is substantial, waiting until your fixed term expires could be more economical.

2. How long must you stay to keep the cash contribution?

Check the clawback period and precisely how repayment is calculated. If you expect to sell your property, move overseas or refinance again, a large cash contribution with a long clawback period might be less attractive.

3. Can your current bank match the offer?

I would contact your existing bank before accepting the other lender's offer.

Tell it you've received a competing offer with a lower rate and a cash contribution. Ask it to review both your fixed rates and any available retention incentive.

Even if it can't match the cash contribution, a sufficiently low interest rate could make staying worthwhile. It may also save you the legal and administrative work of refinancing.

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4. Let me narrow this down to the best lenders for your mortgage

I can give you a more useful recommendation if we compare your actual situation rather than relying on advertised rates.

Could you tell me these four things?

• Current lender: ANZ, ASB, BNZ, Westpac, Kiwibank or another lender?
• Outstanding mortgage: Approximately how much do you still owe? For example, $400,000 or $700,000.
• Current interest rate: What rate are you paying, and when does your fixed term expire? If you have multiple loan portions, give me the approximate rate and balance of each.
• Competing offer: Which lender is offering the lower rate, what is that rate, and how much cash are they offering?

Estimates are perfectly fine.

With those details, I can help you identify which lenders are most worth approaching, whether the offer you've received is attractive, and how much you could save by switching versus negotiating with your current bank.