How much does 1% add to a monthly mortgage payment?

On a 30-year fixed loan, roughly $66 per month for every $100,000 borrowed when moving from the 6% range to the 7% range. On a $400,000 loan that is about $263 per month. The dollar figure grows slightly at higher rate levels because the amortization curve steepens.

How much difference does 0.25% make on a mortgage?

About $16 per month per $100,000 borrowed on a 30-year fixed. On a $400,000 loan, moving from 6.00% to 6.25% raises the principal-and-interest payment from roughly $2,398 to $2,463 — about $65 per month, or $23,000 in additional interest across a full 30-year term.

Does a 1% higher rate reduce how much house I can buy?

Yes, by roughly 9% to 10% of loan amount. A payment that supports a $400,000 loan at 6% supports about $360,500 at 7%. Each 0.25% costs roughly 2.5% of borrowing power at these rate levels.

Is it cheaper to buy points or to wait for a lower rate?

That depends entirely on how long you keep the loan, and nobody can tell you where rates go. Points have a calculable break-even — divide the upfront cost by the monthly savings to get the number of months you must keep the loan to come out ahead. Waiting has no calculable break-even because the future rate is unknown.

Do rate changes affect ARM payments the same way?

During the fixed period, no — the payment is locked. At the first adjustment, the new rate is set by the index plus the margin, subject to caps. A 1% market move can translate into a smaller or larger payment change depending on where the index sits and which caps apply.

Does a 1% rate change affect a 15-year loan less?

In monthly dollars, yes proportionally less per dollar borrowed, and dramatically less in total interest, because there is far less time for interest to accrue. The trade-off is a much higher required monthly payment at any rate.

Should I shrink my price target or accept the higher payment?

That is a budget question, not a rate question. Run both numbers: the payment at your current price target and the price that keeps the payment where you want it. A licensed loan officer can price your exact scenario across programs before you decide.

How Much Does a 1% Mortgage Rate Change Affect Your Payment?

Rate headlines move in decimals. Budgets move in dollars. Here is the conversion.

TL;DR

Per $100,000 borrowed, a 1% rate change is worth about $66 per month on a 30-year fixed in the 6%–7% range. A 0.25% change is about $16 per month.
On a $400,000 loan, 6.00% versus 7.00% is $2,398 versus $2,661 — a $263 monthly difference and roughly $94,700 more interest over a full 30-year term.
Buying power falls about 9%–10% for each full point of rate. The payment that carries $400,000 at 6% carries about $360,500 at 7%.
Points have a break-even you can calculate; waiting for a rate move does not, because the future rate is unknown.
The rate is only one line of the payment. Taxes, insurance, HOA dues, and mortgage insurance often move the total by more than a quarter point does.

The per-$100,000 shortcut

Every payment table in this article comes from the same standard amortization formula lenders use. The useful shortcut: on a 30-year fixed, monthly principal and interest per $100,000 borrowed runs about $600 at 6.00%, $616 at 6.25%, $632 at 6.50%, and $665 at 7.00%.

Multiply by your loan amount in hundred-thousands and you have the principal-and-interest figure. A $525,000 loan at 6.5% is about 5.25 × $632, or roughly $3,318 per month.

Two caveats. First, this is principal and interest only — not the full housing payment. Second, the dollar-per-point figure is not constant across all rate levels; it grows as rates rise, because a larger share of each early payment goes to interest. From 3% to 4% the gap per $100,000 is closer to $56 per month; from 7% to 8% it is closer to $69.

Payment by loan size and rate

Thirty-year fixed, principal and interest only:

Loan amount | 6.00% | 6.25% | 6.50% | 7.00% | 6% → 7% difference

$250,000 | $1,499 | $1,539 | $1,580 | $1,663 | +$164/mo

$300,000 | $1,799 | $1,847 | $1,896 | $1,996 | +$197/mo

$400,000 | $2,398 | $2,463 | $2,528 | $2,661 | +$263/mo

$500,000 | $2,998 | $3,079 | $3,160 | $3,327 | +$329/mo

$750,000 | $4,497 | $4,618 | $4,741 | $4,990 | +$493/mo

Figures are rounded to the nearest dollar and exclude property taxes, homeowners insurance, HOA dues, and mortgage insurance. They are illustrative calculations, not quoted rates.

The pattern worth internalizing: a quarter point is a restaurant dinner, a half point is a phone bill, and a full point is a car payment. On a $750,000 jumbo loan, the same full point is nearly $500 a month — which is why rate shopping matters more as loan size grows. See our jumbo loan requirements guide for how pricing works above the conforming limit, and check your county's cutoff with the conforming limit lookup.

Lifetime interest: the number nobody quotes you

Monthly payment differences look survivable. Total interest does not.

On a $400,000 loan held to full term:

Rate | Monthly P&I | Total interest over 30 years | Extra vs 6.00%

6.00% | $2,398 | $463,353 | —

6.25% | $2,463 | $486,633 | +$23,280

6.50% | $2,528 | $510,178 | +$46,825

7.00% | $2,661 | $558,036 | +$94,683

A single quarter point costs more than $23,000 across the full term of a $400,000 loan. A full point costs nearly $95,000 — roughly a quarter of the original principal.

The honest caveat: almost nobody holds a 30-year loan for 30 years. Median tenure runs closer to 7–10 years, and any refinance or sale resets the clock. So the more decision-relevant figure is the shorter hold.

Over the first five years on that same $400,000 loan:

At 6.00%: $143,892 paid in, of which $116,110 is interest and $27,783 is principal.
At 7.00%: $159,673 paid in, of which $136,199 is interest and $23,474 is principal.

The 7% borrower pays about $15,800 more over five years and builds about $4,300 less equity — a roughly $20,100 swing in net position before any appreciation. That is the number to weigh, not the 30-year total.

What a rate change does to your buying power

Hold the payment constant and the rate decides how much loan that payment buys. Starting from a $2,398 monthly principal-and-interest budget — the payment on $400,000 at 6.00%:

Rate | Loan supported by $2,398/mo | Change in borrowing power

6.00% | $400,000 | —

6.25% | $389,497 | −$10,503 (−2.6%)

6.50% | $379,422 | −$20,578 (−5.1%)

7.00% | $360,468 | −$39,532 (−9.9%)

Roughly 2.5% of borrowing power per quarter point, and about 10% per full point, at these levels.

At a 20% down payment, that $39,532 of lost loan capacity translates to about $49,400 of lost purchase price. In a market where price growth is uneven by region, this is often the difference between two neighborhoods rather than two houses. Run your own numbers with the affordability calculator.

Worked example: the Ramirez household

Hypothetical, for illustration only.

A household is pre-approved with a $2,400 monthly principal-and-interest budget. They found a house at $500,000 and planned on 20% down — a $400,000 loan. Their quote moved from 6.00% to 6.75% between pre-approval and offer. They have four options:

Option 1 — Accept the higher payment. At 6.75%, $400,000 costs $2,594 per month. That is $196 over budget, about $2,350 per year. Workable only if the budget had slack.

Option 2 — Shrink the loan. A $2,400 payment at 6.75% supports about $370,000. With 20% down that is a $462,500 purchase price — a $37,500 reduction in target.

Option 3 — Bring more cash. Increasing the down payment from $100,000 to $130,000 gets the loan back to $370,000 at the same $500,000 price. This converts a monthly problem into a liquidity problem, and drains reserves underwriters like to see.

Option 4 — Buy the rate down. Two discount points on a $400,000 loan cost $8,000 and might buy roughly 0.50%, moving 6.75% to 6.25%. The payment drops from $2,594 to $2,463 — $131 per month saved. Break-even: $8,000 ÷ $131 ≈ 61 months. If they expect to sell or refinance inside five years, the points do not pay back.

There is no universally correct answer here. The point is that all four options are arithmetic, and the arithmetic can be run before the decision instead of after.

The break-even math on points

A discount point costs 1% of the loan amount and typically buys somewhere between 0.125% and 0.25% off the rate, depending on the day's pricing and your file. The break-even calculation is the same every time:

Upfront cost ÷ monthly savings = months to break even.

$300,000 | 1.0 | $3,000 | 6.50% → 6.25% | $49 | 61 months

$400,000 | 1.0 | $4,000 | 6.50% → 6.25% | $65 | 62 months

$400,000 | 2.0 | $8,000 | 6.75% → 6.25% | $131 | 61 months

$500,000 | 1.0 | $5,000 | 7.00% → 6.75% | $84 | 60 months

Break-even lands near five years across loan sizes, because both cost and savings scale with the loan. What changes the answer is your holding period, not the loan amount. Selling or refinancing before break-even means the points were a loss.

Two things that tilt the math: seller-paid points via concessions change your out-of-pocket cost to zero, which removes the break-even question entirely (see seller concessions and credits explained), and discount points may be deductible as prepaid mortgage interest — the IRS points guidance sets out the conditions. Our discount points article walks through the product in more depth, and temporary buydowns covers the 2-1 and 1-0 structures, which work differently from permanent points.

What the rate does not control

A rate delta is easy to fixate on because it is a single number in a headline. On the actual closing disclosure it competes with:

Property taxes, which vary from well under 1% to over 2% of assessed value annually by jurisdiction. On a $500,000 home, a 1-point-of-tax difference is more than $400 per month — larger than a full point of interest rate.
Mortgage insurance, which runs roughly 0.20% to 1.50% annually on conventional loans depending on credit and loan-to-value, and follows separate rules on FHA. See PMI explained.
Homeowners insurance, which has moved sharply in some coastal and wildfire-exposed markets.
HOA dues, which underwriting counts against your debt-to-income ratio at full value.
Loan program. A VA loan with no monthly mortgage insurance can beat a conventional loan at a lower note rate on total monthly cost.

Comparing note rates between two quotes without comparing total monthly housing cost and total cash to close is how borrowers pick the more expensive loan. Our guide to reading a loan estimate shows which boxes to compare, and what determines your mortgage rate covers the borrower-side inputs you can actually influence.

Using this when applications are falling

Application volume drops when rates rise — that is the mechanical relationship, and it says nothing about where rates go next. What it does mean is a thinner queue: less competition for lender attention, and more room to get multiple quotes priced on the same day.

Three things that hold regardless of rate direction:

Compare quotes priced on the same day. Rates move daily. A Tuesday quote against a Friday quote is not a comparison.
Know your break-even before agreeing to points, not after seeing the rate improvement.
Decide your maximum payment before your maximum price. The payment is what you live with; the price is what you tell people.

The question "should I wait" cannot be answered with math, because the input is unknown. The question "what does this rate cost me per month, over five years, and in purchase price" can be answered exactly — before you sign anything.

Sources & verification

Payment figures in this article are computed with the standard fixed-rate amortization formula on a 360-month term and are rounded to the nearest dollar. They are illustrative and are not rate quotes.

Disclosure

MLO Finder is a directory of mortgage loan officers, not a lender. We don't originate loans, set rates, or guarantee approval. Verify any loan officer's current licensing through NMLS Consumer Access before working with them. Information here is educational and not personalized financial advice — consult a licensed loan officer or financial planner for guidance specific to your situation.

How Much Does a 1% Mortgage Rate Change Affect Your Payment?