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3–7 yr · Which month does a refinance start making money?

Refinance break-even

A refinance is an amount now against a saving per month. Divide one by the other and you have the month it pays back — then check the second number, because a lower payment on a restarted schedule can still cost more in total.

Every figure this page produces is illustrative. The rate you type is an assumption, not an offer; nothing here is a quote, an application or a commitment to lend. The assumptions in force are printed at the bottom of the page.

What you are working from

What you owe today, not what you borrowed.

312 is twenty-six years. A thirty-year loan four years old has 312 payments left.

You type this. It is a number you are testing, not one Plinth is offering.

Lender fees, title, recording, appraisal, prepaid escrow. Your Loan Estimate itemises the real ones.

Recalculates as you type. There is no submit button and nothing is sent.

It pays back in Illustrative

Payment now
$0

Principal and interest on the loan you have. Illustrative.

Payment after
$0

Monthly difference
$0

The number the monthly saving hides

Interest still to pay, both loans
Interest still to pay, loan you have$0
Interest on the new loan$0
Closing costs$0
Difference over the whole loan$0

Money out of pocket: keeping the loan against refinancing

Both lines are cumulative payments. The refinance starts behind by its costs — rolled-in costs are still money you owe, so they are counted here either way — and the marked month is where it catches up. If the refinance line climbs past the other one later, that is the restarted term charging you for the lower payment. All figures illustrative.

Money out of pocket: keeping the loan against refinancing
Show these numbers as a table

Interest charged, running total, both loans

Where the two curves finish is what each loan costs in interest from today onwards. A lower rate over a longer schedule can end higher than a higher rate over a shorter one, which is the whole reason this chart is here.

Interest charged, running total, both loans

Two things the arithmetic does not tell you

You get three business days to change your mind

On a refinance of your principal residence, the Truth in Lending Act gives you a right of rescission: three business days after closing, after receiving your notice of the right to cancel and after receiving the material disclosures, in which you can cancel the loan and walk away. The money is not disbursed until that window closes. A purchase mortgage carries no such right, and neither does a refinance of a second home or an investment property.

If your loan is already FHA or VA, ask about the short route

An existing FHA loan can usually be refinanced through the FHA Streamline programme, with reduced documentation and, in most cases, no new appraisal. An existing VA loan has the Interest Rate Reduction Refinance Loan — the IRRRL — which carries a reduced funding fee. Both change the costs on the left-hand side of this page, and the costs are half of the break-even sum, so it is worth asking before you price a conventional refinance.

The assumptions in force

  • The rates are yours, not ours. Plinth publishes no rates. Both figures are assumptions you control, and the break-even month moves with them.
  • Break-even is costs divided by the monthly saving. It ignores what the money would have earned elsewhere, and it ignores tax treatment. It is the plain version of the question, and it is the version that decides most files.
  • A refinance restarts the amortisation clock. Thirty years of interest charged again on a balance you have already been paying down for years is why the total can rise even when the rate falls. Matching the new term to the months you have left is the way to test that.
  • Rolled-in costs are not free. They increase the balance, so you pay interest on them for the whole new term. This page counts them as money owed from day one either way.
  • Principal and interest only. Property tax, insurance, HOA dues and mortgage insurance are not modelled. If a refinance changes your mortgage insurance — as it can when it ends FHA MIP — that is a real saving this page does not show.
  • Refinancing your principal residence gives you a three business day right to rescind under the Truth in Lending Act. A purchase does not.
  • Nothing here is a quote, an offer, an application or a commitment to lend.

No obligation, and no transmission

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