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15–30 yr · Where does each payment actually go?

Amortisation schedule

Every payment is the same size and almost none of them do the same thing. This is the whole schedule — switch it between months and years, and watch for the period where principal finally overtakes interest.

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

The amount borrowed, not the purchase price. The down payment has already come off.

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

Only used to date the rows. It changes nothing about the arithmetic.

Applied on top of every scheduled payment. It shortens the schedule; it does not reduce next month's bill.

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

Scheduled payment Illustrative

$0

Principal and interest only, on a $0 loan at 0%over 0 years. Tax, insurance, HOA and mortgage insurance sit on top of this figure and are not modelled here.

Payments in the schedule
0

—

Total interest over the term
$0

Illustrative, and only if the loan runs to the end.

Total paid, principal and interest
$0

—

Principal overtakes interest at —

Where each payment goes

Two lines from one unchanging payment. The dashed line is interest, the solid line is principal, and the marked period is where they cross — later than nearly everyone expects on a 30-year term.

Where each payment goes

Balance owed, and principal repaid

The balance barely moves in the first years because the payment is nearly all interest. Both curves are illustrative and assume every payment is made on time and none is skipped.

Balance owed, and principal repaid

Interest charged, running total

The number that decides whether a term is expensive. It rises steeply, then flattens as the balance it is charged on falls away.

Interest charged, running total
Show these numbers as a table

The schedule itself

Every figure below is illustrative. The running total on the right is the interest charged so far — the column most schedules leave out, and the one that answers the question people actually have.

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The assumptions in force

  • The rate is yours, not ours. Plinth publishes no rates. The figure in the box is an assumption you control, and every row of the schedule moves with it.
  • This is a level-payment, fully amortising loan. Interest is charged monthly on the outstanding balance, and the payment never changes. An adjustable rate would redraw everything from its first adjustment.
  • Principal and interest only. Property tax, insurance, HOA dues and mortgage insurance are real monthly money and none of them appear here. The monthly payment calculator itemises all five layers.
  • Extra principal shortens the schedule; it does not lower the payment. A recast, where the servicer re-amortises the remaining balance over the remaining term, is the thing that lowers the payment — and not every loan allows one.
  • The dates only label the rows. They assume payments start in the month you choose and never miss. Nothing about the arithmetic depends on them.
  • Nothing here is a quote, an offer, an application or a commitment to lend.

No obligation, and no transmission

Ask a person about this

A broker needs six things to say anything useful. This form asks for exactly those and nothing else — no date of birth, no Social Security number, no credit pull.

This form does not send anything. It validates what you type and then stops. Nothing is stored, nothing is transmitted, no cookie is set and nobody will call you. The demonstration is the point — on a real build one function call inLeadForm.astro would hand this to a CRM.

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