How Long to Pay Off Half of a 30 Year Mortgage: The Halfway Month by Rate

A fixed-rate loan's balance after any payment can be written directly: balance after payment k = P × [(1+r)ⁿ − (1+r)^k] ÷ [(1+r)ⁿ − 1], where P is the amount borrowed, r is the annual rate divided by 12, and n is 360. Set that balance equal to P ÷ 2 and the P cancels out, leaving (1+r)^k = [(1+r)ⁿ + 1] ÷ 2. Two things follow. First, the halfway month does not depend on how much you borrowed — a $150,000 loan and a $750,000 loan at the same rate and term cross the 50% line in the same month. Second, the only lever is the rate. If you want the derivation behind that balance expression, our page on the mortgage amortization formula walks through it step by step.

We solved that equation for every half-point rate between 3% and 8%, plus the current 7.40% reference rate from the Freddie Mac Primary Mortgage Market Survey (week of October 15, 2026, read October 2026), and then confirmed each answer against a full month-by-month schedule. The dollar columns use a $400,000 loan so you can see the interest bill that accumulates on the way to the midpoint; the month column applies to any loan size.

Table 1. Inputs: 360 monthly payments, fixed rate as shown, no extra principal; dollar columns on a $400,000 loan. Computed by the site's amortization formula on 2026-10-19.

Read the last column carefully, because it is the real reason the midpoint arrives so late. By the time a 7.40% borrower owes half of what they borrowed, they have already paid 89.2% of all the interest the loan will ever charge — $532,590 of a lifetime $597,027. The interest is front-loaded; the principal is back-loaded. The payment never changes, but what it buys does. On the same $400,000 loan the very first payment of $2,769.52 sends $2,466.67 to interest and only $302.85 to principal.

Compare that with an imaginary 0% loan, where every payment retires exactly 1/360 of the debt: its balance halves at payment 180, precisely 15 years in. Interest is what pushes the real midpoint out — by 3 years 4 months at 3%, and by 7 years 1 month at 7.40%. Each half-point of rate adds roughly four to six months to the wait in this range, with the steps getting slightly smaller as rates climb, because the halfway month is approaching a ceiling: however high the rate, the balance must still reach zero at payment 360.

Two side notes keep the table honest. Rates above are the contract rate on the note, not an APR; fees and points do not change the schedule. And the 7.40% and 7.50% rows share the same month (265) because the 50% line falls between payments differently — at 7.40% the balance drops from $200,202 to $198,667 at payment 265, at 7.50% from $201,447 to $199,909. For comparison, a 15-year loan at Freddie Mac's same-week 15-year average of 6.71% reaches its halfway point at payment 112, nine years and four months in — 62% of the way through its term, against 74% for the 30-year at 7.40%. The 15-year mortgage amortization schedule shows that shorter curve in full.

The question “what percentage should I have paid off by now?” has a precise answer, because a fixed-rate schedule is fixed: if you have made every payment and nothing extra, your balance is exactly where the schedule says, and there is no separate target you are supposed to hit. What changes from borrower to borrower is the rate. The table below gives the cumulative share of the original loan repaid at the end of every year, at the current 7.40% reference rate and at 6.00% for comparison. Because it is expressed as a percentage, it works for any loan size.

Table 2. Inputs: 30-year fixed, 360 monthly payments, scheduled payments only; percentages of the original principal. Computed by the site's amortization formula on 2026-10-19.

Three patterns stand out. The first decade is slow: at 7.40% the loan is 5.5% repaid after five years and 13.4% after ten, which is why the equity in a home sold early comes mostly from the down payment and any change in price. The middle decade accelerates: from year 10 to year 20 the share repaid triples, from 13.4% to 41.4%. And the last decade does most of the work — 58.6% of the original loan is retired in years 21 to 30. At 6.00% the curve is gentler throughout (16.3% gone after ten years, 50.1% after 21), which is the practical value of a lower rate beyond the smaller payment.

The same mechanism shows up inside each payment. The share of a year's payments that reaches principal starts small and climbs every month. Here is that share for selected years, with the dollars of principal repaid in that year on a $400,000 loan — at 7.40% (payment $2,769.52) and at 6.00% (payment $2,398.20):

Table 3. Inputs: $400,000, 30-year fixed, no extra payments; share = principal ÷ (principal + interest) over the 12 payments of that loan year. Computed by the site's amortization formula on 2026-10-19.

So on a standard 30-year amortization at 7.40%, about 15.2% of what you pay in year 5 goes to principal; at 6.00% it is 21.7%. Principal does not overtake interest until year 21 at 7.40% (payment 249; the year-20 share is still 46.0%) and until year 19 at 6.00% (payment 223). If you want those splits as a month-by-month table in dollars, the 30 year mortgage amortization schedule generates every row for your own balance and rate, and the principal and interest calculator isolates the split for any single payment.

Knowing how long to pay off half of a 30 year mortgage in general is useful; knowing where your own loan stands is more useful, and you do not need the original schedule to measure it. Two numbers are enough: the amount you originally borrowed, and the principal balance on your most recent statement. Federal servicing rules require most servicers to send a written statement each billing cycle that shows how your payments have been applied, as the CFPB's summary of servicer rules explains (read October 2026; coupon-book loans and some small servicers are exceptions). Use the principal balance line, not the payoff quote, which can also include interest accrued since your last payment.

The arithmetic is one line: percentage paid off = (original loan − current principal balance) ÷ original loan × 100. Take a borrower whose initial mortgage was $289,000 and who now owes $178,000. They have repaid $111,000, and $111,000 ÷ $289,000 = 38.4% paid off, with 61.6% still owed. To judge whether that is on pace, find where 38.4% sits on Table 2: at 7.40% it falls between the end of year 19 (37.6%) and year 20 (41.4%). Running the $289,000 loan through a 360-month schedule pins it down — the balance first reaches $178,000 at:

• 3.00%: payment 178 (14 years 10 months; payment $1,218.44)
• 5.00%: payment 204 (17 years; payment $1,551.41)
• 6.00%: payment 216 (18 years; payment $1,732.70)
• 7.40%: payment 231 (19 years 3 months; payment $2,000.98)

If you are further along than the payment count for your rate suggests, you have been paying extra principal (or the loan was recast or modified); if you are behind, check for an interest-only period, a missed payment, or a rate above the one you assumed. The halfway point for the same borrower is then simply the month the balance reaches $144,500.

Extra principal is the one tool that moves that month. Because the midpoint is reached when cumulative principal hits 50%, every extra dollar counts toward it in full, and it also shrinks every later interest charge. On the $400,000, 7.40% loan:

Table 4. Inputs: $400,000, 7.40%, 30-year fixed, scheduled payment $2,769.52 plus the extra amount from payment 1, applied entirely to principal. Computed by the site's amortization formula on 2026-10-19.

The $300 row is worth a second look: with $300 a month extra, the whole loan is gone at payment 265 — the same month the unaided loan merely reaches the halfway mark. A $100 addition pulls the midpoint forward by three years and one month. The extra money only works this way if your servicer applies it to principal rather than holding it toward the next payment, so confirm how it shows up on the next statement. To test your own amounts, including one-time lump sums, use the mortgage calculator with extra payments; if you would rather put in one large sum and lower the payment instead of shortening the term, the mortgage recast calculator models that route. The mortgage amortization calculator on our homepage shows the whole schedule for any loan.