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There is no automatic winner between putting another 5% down and using that cash to reduce the interest rate. I compare complete loan structures at the same purchase price, including mortgage insurance, closing costs and money left after closing. The lower note rate can still come with a larger balance or a less comfortable cash position.
The buyer’s goal came first
In one purchase conversation, the buyer wanted a payment around $3,400 and was comparing 5% and 10% down. Different rate possibilities were explored. Those historical rates are omitted here because they are not current pricing and the complete fee and mortgage-insurance assumptions are needed to reproduce the comparison.
The useful firsthand question was how to use a limited pool of cash. Putting more into the down payment was one path. Putting less down and paying for a lower rate was another. Retaining some cash was also a question worth keeping visible rather than assuming every available dollar had to be used.
Keep the starting conditions consistent
I would ask for written options with the same property, purchase price, loan term and pricing date. If one worksheet has different insurance, taxes or association dues, the apparent mortgage advantage may actually come from different assumptions.
- Purchase price and accepted property value.
- Down payment and resulting starting balance.
- Note rate, APR, discount points and other costs.
- Mortgage-insurance cost and the applicable cancellation conditions.
- Total monthly housing payment.
- Cash required at closing and reserves remaining afterward.
Paying points exchanges an upfront cost for a lower rate, while a larger down payment reduces the initial borrowing. Ask for the dollar result rather than assuming one percentage of points produces a particular rate reduction. The CFPB points guide (new tab) explains the pricing tradeoff.
The loan balance difference matters
For every $100,000 of purchase price, the difference between 5% and 10% down is $5,000. Choosing the smaller down payment means borrowing that additional $5,000, before considering any financed costs. A lower rate must be evaluated on the larger balance, not simply applied to the smaller loan from the other worksheet.
Mortgage insurance and lender pricing may also differ. I would compare actual quotes instead of taking the payment from one plan and the cash figure from another. The selected structure has to stand on its own.
Use more than a simple break-even number
Upfront cost divided by monthly payment savings is a useful starting calculation when the comparison is otherwise consistent. Here, balances may differ, so I would also compare remaining principal at the expected sale or refinance date. A lower payment does not by itself establish lower total cost.
Then I would test an earlier exit and a longer stay. If the decision depends on staying exactly long enough to recover the points, that uncertainty needs to be part of the conversation. Keep a realistic reserve for moving, repairs and ordinary life rather than spending the emergency cushion to achieve a target rate.
Do seller credits change the comparison?
They can change which costs the buyer pays, but eligibility and contribution limits still apply. The permitted credit may also change with the transaction’s loan-to-value ratio. Review the allocation with the lender before relying on the same seller contribution under both down-payment choices.
Which option would I choose for a $3,400 comfort target? I would first confirm that the target includes taxes, insurance, mortgage insurance and association dues. Then I would show which actual structures fit and what each uses in cash. The decision should protect both the monthly budget and the money the buyer wants to keep available.
Published September 13, 2026. Adapted from an origination discussion I worked through. Identifying details are omitted. Figures describe the discussion or clearly stated calculations, not current loan offers or guaranteed outcomes. Program, property and borrower requirements need an individual review. Nick Cunningham, Loan Officer, NMLS #907393. Mortgage services through Golden Bay Mortgage Group.
