Calculate how extra payments can accelerate your mortgage payoff. Add multiple one-time and recurring payments to see your new payoff date, interest saved, and detailed amortization schedules. Perfect for homeowners looking to save on interest and become mortgage-free faster. If you have a lump sum, compare recasting, refinancing and an extra principal payment to see how payment relief and total cost differ.

Loan Inputs

$

Principal borrowed at origination.

%

Fixed note rate with monthly payments.

years

Original loan term.

Used for schedule dates.

Standard Monthly Payment (P&I)
$2,528.27

Extra Principal

One-Time Extra

Apply a lump sum on a specific month number (1 = first month).

$

Recurring Monthly Extra

Apply a fixed extra each month between a start and end month (inclusive).

$
Payoff Date (with extras)
September 2056
Months to Payoff (with extras)
360
Time saved vs base: 0 mo
Total Interest (with extras)
$510,179.81
Interest saved vs base: $0.00
Total Extra Principal Paid
$0.00

Remaining Balance & Cumulative Interest

M1M19M39M59M79M99M122M145M169M192M215M239M263M288M311M335M360$0k$150k$300k$450k$600k
  • Remaining Balance
  • Cumulative Interest Paid

Yearly Principal vs Interest

20262029203220352038204120442047205020532056$0k$8k$16k$24k$32k
  • Principal
  • Interest

Amortization Schedule (with extras)

#DatePaymentInterestPrincipalExtrasEnding Balance
12026-10-01$2,528.27$2,166.67$361.60$0.00$399,638.40
22026-11-01$2,528.27$2,164.71$363.56$0.00$399,274.84
32026-12-01$2,528.27$2,162.74$365.53$0.00$398,909.31
42027-01-01$2,528.27$2,160.76$367.51$0.00$398,541.80
52027-02-01$2,528.27$2,158.77$369.50$0.00$398,172.30
62027-03-01$2,528.27$2,156.77$371.50$0.00$397,800.80
72027-04-01$2,528.27$2,154.75$373.52$0.00$397,427.28
82027-05-01$2,528.27$2,152.73$375.54$0.00$397,051.74
92027-06-01$2,528.27$2,150.70$377.57$0.00$396,674.17
102027-07-01$2,528.27$2,148.65$379.62$0.00$396,294.55
112027-08-01$2,528.27$2,146.60$381.67$0.00$395,912.88
122027-09-01$2,528.27$2,144.53$383.74$0.00$395,529.14
132027-10-01$2,528.27$2,142.45$385.82$0.00$395,143.32
142027-11-01$2,528.27$2,140.36$387.91$0.00$394,755.41
152027-12-01$2,528.27$2,138.26$390.01$0.00$394,365.40
162028-01-01$2,528.27$2,136.15$392.12$0.00$393,973.28
172028-02-01$2,528.27$2,134.02$394.25$0.00$393,579.03
182028-03-01$2,528.27$2,131.89$396.38$0.00$393,182.65
192028-04-01$2,528.27$2,129.74$398.53$0.00$392,784.12
202028-05-01$2,528.27$2,127.58$400.69$0.00$392,383.43
212028-06-01$2,528.27$2,125.41$402.86$0.00$391,980.57
222028-07-01$2,528.27$2,123.23$405.04$0.00$391,575.53
232028-08-01$2,528.27$2,121.03$407.24$0.00$391,168.29
242028-09-01$2,528.27$2,118.83$409.44$0.00$390,758.85
252028-10-01$2,528.27$2,116.61$411.66$0.00$390,347.19
262028-11-01$2,528.27$2,114.38$413.89$0.00$389,933.30
272028-12-01$2,528.27$2,112.14$416.13$0.00$389,517.17
282029-01-01$2,528.27$2,109.88$418.39$0.00$389,098.78
292029-02-01$2,528.27$2,107.62$420.65$0.00$388,678.13
302029-03-01$2,528.27$2,105.34$422.93$0.00$388,255.20
312029-04-01$2,528.27$2,103.05$425.22$0.00$387,829.98
322029-05-01$2,528.27$2,100.75$427.52$0.00$387,402.46
332029-06-01$2,528.27$2,098.43$429.84$0.00$386,972.62
342029-07-01$2,528.27$2,096.10$432.17$0.00$386,540.45
352029-08-01$2,528.27$2,093.76$434.51$0.00$386,105.94
362029-09-01$2,528.27$2,091.41$436.86$0.00$385,669.08
372029-10-01$2,528.27$2,089.04$439.23$0.00$385,229.85
382029-11-01$2,528.27$2,086.66$441.61$0.00$384,788.24
392029-12-01$2,528.27$2,084.27$444.00$0.00$384,344.24
402030-01-01$2,528.27$2,081.86$446.41$0.00$383,897.83
412030-02-01$2,528.27$2,079.45$448.82$0.00$383,449.01
422030-03-01$2,528.27$2,077.02$451.25$0.00$382,997.76
432030-04-01$2,528.27$2,074.57$453.70$0.00$382,544.06
442030-05-01$2,528.27$2,072.11$456.16$0.00$382,087.90
452030-06-01$2,528.27$2,069.64$458.63$0.00$381,629.27
462030-07-01$2,528.27$2,067.16$461.11$0.00$381,168.16
472030-08-01$2,528.27$2,064.66$463.61$0.00$380,704.55
482030-09-01$2,528.27$2,062.15$466.12$0.00$380,238.43
492030-10-01$2,528.27$2,059.62$468.65$0.00$379,769.78
502030-11-01$2,528.27$2,057.09$471.18$0.00$379,298.60
512030-12-01$2,528.27$2,054.53$473.74$0.00$378,824.86
522031-01-01$2,528.27$2,051.97$476.30$0.00$378,348.56
532031-02-01$2,528.27$2,049.39$478.88$0.00$377,869.68
542031-03-01$2,528.27$2,046.79$481.48$0.00$377,388.20
552031-04-01$2,528.27$2,044.19$484.08$0.00$376,904.12
562031-05-01$2,528.27$2,041.56$486.71$0.00$376,417.41
572031-06-01$2,528.27$2,038.93$489.34$0.00$375,928.07
582031-07-01$2,528.27$2,036.28$491.99$0.00$375,436.08
592031-08-01$2,528.27$2,033.61$494.66$0.00$374,941.42
602031-09-01$2,528.27$2,030.93$497.34$0.00$374,444.08
612031-10-01$2,528.27$2,028.24$500.03$0.00$373,944.05
622031-11-01$2,528.27$2,025.53$502.74$0.00$373,441.31
632031-12-01$2,528.27$2,022.81$505.46$0.00$372,935.85
642032-01-01$2,528.27$2,020.07$508.20$0.00$372,427.65
652032-02-01$2,528.27$2,017.32$510.95$0.00$371,916.70
662032-03-01$2,528.27$2,014.55$513.72$0.00$371,402.98
672032-04-01$2,528.27$2,011.77$516.50$0.00$370,886.48
682032-05-01$2,528.27$2,008.97$519.30$0.00$370,367.18
692032-06-01$2,528.27$2,006.16$522.11$0.00$369,845.07
702032-07-01$2,528.27$2,003.33$524.94$0.00$369,320.13
712032-08-01$2,528.27$2,000.48$527.79$0.00$368,792.34
722032-09-01$2,528.27$1,997.63$530.64$0.00$368,261.70
732032-10-01$2,528.27$1,994.75$533.52$0.00$367,728.18
742032-11-01$2,528.27$1,991.86$536.41$0.00$367,191.77
752032-12-01$2,528.27$1,988.96$539.31$0.00$366,652.46
762033-01-01$2,528.27$1,986.03$542.24$0.00$366,110.22
772033-02-01$2,528.27$1,983.10$545.17$0.00$365,565.05
782033-03-01$2,528.27$1,980.14$548.13$0.00$365,016.92
792033-04-01$2,528.27$1,977.17$551.10$0.00$364,465.82
802033-05-01$2,528.27$1,974.19$554.08$0.00$363,911.74
812033-06-01$2,528.27$1,971.19$557.08$0.00$363,354.66
822033-07-01$2,528.27$1,968.17$560.10$0.00$362,794.56
832033-08-01$2,528.27$1,965.14$563.13$0.00$362,231.43
842033-09-01$2,528.27$1,962.09$566.18$0.00$361,665.25
852033-10-01$2,528.27$1,959.02$569.25$0.00$361,096.00
862033-11-01$2,528.27$1,955.94$572.33$0.00$360,523.67
872033-12-01$2,528.27$1,952.84$575.43$0.00$359,948.24
882034-01-01$2,528.27$1,949.72$578.55$0.00$359,369.69
892034-02-01$2,528.27$1,946.59$581.68$0.00$358,788.01
902034-03-01$2,528.27$1,943.44$584.83$0.00$358,203.18
912034-04-01$2,528.27$1,940.27$588.00$0.00$357,615.18
922034-05-01$2,528.27$1,937.08$591.19$0.00$357,023.99
932034-06-01$2,528.27$1,933.88$594.39$0.00$356,429.60
942034-07-01$2,528.27$1,930.66$597.61$0.00$355,831.99
952034-08-01$2,528.27$1,927.42$600.85$0.00$355,231.14
962034-09-01$2,528.27$1,924.17$604.10$0.00$354,627.04
972034-10-01$2,528.27$1,920.90$607.37$0.00$354,019.67
982034-11-01$2,528.27$1,917.61$610.66$0.00$353,409.01
992034-12-01$2,528.27$1,914.30$613.97$0.00$352,795.04
1002035-01-01$2,528.27$1,910.97$617.30$0.00$352,177.74
1012035-02-01$2,528.27$1,907.63$620.64$0.00$351,557.10
1022035-03-01$2,528.27$1,904.27$624.00$0.00$350,933.10
1032035-04-01$2,528.27$1,900.89$627.38$0.00$350,305.72
1042035-05-01$2,528.27$1,897.49$630.78$0.00$349,674.94
1052035-06-01$2,528.27$1,894.07$634.20$0.00$349,040.74
1062035-07-01$2,528.27$1,890.64$637.63$0.00$348,403.11
1072035-08-01$2,528.27$1,887.18$641.09$0.00$347,762.02
1082035-09-01$2,528.27$1,883.71$644.56$0.00$347,117.46
1092035-10-01$2,528.27$1,880.22$648.05$0.00$346,469.41
1102035-11-01$2,528.27$1,876.71$651.56$0.00$345,817.85
1112035-12-01$2,528.27$1,873.18$655.09$0.00$345,162.76
1122036-01-01$2,528.27$1,869.63$658.64$0.00$344,504.12
1132036-02-01$2,528.27$1,866.06$662.21$0.00$343,841.91
1142036-03-01$2,528.27$1,862.48$665.79$0.00$343,176.12
1152036-04-01$2,528.27$1,858.87$669.40$0.00$342,506.72
1162036-05-01$2,528.27$1,855.24$673.03$0.00$341,833.69
1172036-06-01$2,528.27$1,851.60$676.67$0.00$341,157.02
1182036-07-01$2,528.27$1,847.93$680.34$0.00$340,476.68
1192036-08-01$2,528.27$1,844.25$684.02$0.00$339,792.66
1202036-09-01$2,528.27$1,840.54$687.73$0.00$339,104.93
1212036-10-01$2,528.27$1,836.82$691.45$0.00$338,413.48
1222036-11-01$2,528.27$1,833.07$695.20$0.00$337,718.28
1232036-12-01$2,528.27$1,829.31$698.96$0.00$337,019.32
1242037-01-01$2,528.27$1,825.52$702.75$0.00$336,316.57
1252037-02-01$2,528.27$1,821.71$706.56$0.00$335,610.01
1262037-03-01$2,528.27$1,817.89$710.38$0.00$334,899.63
1272037-04-01$2,528.27$1,814.04$714.23$0.00$334,185.40
1282037-05-01$2,528.27$1,810.17$718.10$0.00$333,467.30
1292037-06-01$2,528.27$1,806.28$721.99$0.00$332,745.31
1302037-07-01$2,528.27$1,802.37$725.90$0.00$332,019.41
1312037-08-01$2,528.27$1,798.44$729.83$0.00$331,289.58
1322037-09-01$2,528.27$1,794.49$733.78$0.00$330,555.80
1332037-10-01$2,528.27$1,790.51$737.76$0.00$329,818.04
1342037-11-01$2,528.27$1,786.51$741.76$0.00$329,076.28
1352037-12-01$2,528.27$1,782.50$745.77$0.00$328,330.51
1362038-01-01$2,528.27$1,778.46$749.81$0.00$327,580.70
1372038-02-01$2,528.27$1,774.40$753.87$0.00$326,826.83
1382038-03-01$2,528.27$1,770.31$757.96$0.00$326,068.87
1392038-04-01$2,528.27$1,766.21$762.06$0.00$325,306.81
1402038-05-01$2,528.27$1,762.08$766.19$0.00$324,540.62
1412038-06-01$2,528.27$1,757.93$770.34$0.00$323,770.28
1422038-07-01$2,528.27$1,753.76$774.51$0.00$322,995.77
1432038-08-01$2,528.27$1,749.56$778.71$0.00$322,217.06
1442038-09-01$2,528.27$1,745.34$782.93$0.00$321,434.13
1452038-10-01$2,528.27$1,741.10$787.17$0.00$320,646.96
1462038-11-01$2,528.27$1,736.84$791.43$0.00$319,855.53
1472038-12-01$2,528.27$1,732.55$795.72$0.00$319,059.81
1482039-01-01$2,528.27$1,728.24$800.03$0.00$318,259.78
1492039-02-01$2,528.27$1,723.91$804.36$0.00$317,455.42
1502039-03-01$2,528.27$1,719.55$808.72$0.00$316,646.70
1512039-04-01$2,528.27$1,715.17$813.10$0.00$315,833.60
1522039-05-01$2,528.27$1,710.77$817.50$0.00$315,016.10
1532039-06-01$2,528.27$1,706.34$821.93$0.00$314,194.17
1542039-07-01$2,528.27$1,701.89$826.38$0.00$313,367.79
1552039-08-01$2,528.27$1,697.41$830.86$0.00$312,536.93
1562039-09-01$2,528.27$1,692.91$835.36$0.00$311,701.57
1572039-10-01$2,528.27$1,688.38$839.89$0.00$310,861.68
1582039-11-01$2,528.27$1,683.83$844.44$0.00$310,017.24
1592039-12-01$2,528.27$1,679.26$849.01$0.00$309,168.23
1602040-01-01$2,528.27$1,674.66$853.61$0.00$308,314.62
1612040-02-01$2,528.27$1,670.04$858.23$0.00$307,456.39
1622040-03-01$2,528.27$1,665.39$862.88$0.00$306,593.51
1632040-04-01$2,528.27$1,660.71$867.56$0.00$305,725.95
1642040-05-01$2,528.27$1,656.02$872.25$0.00$304,853.70
1652040-06-01$2,528.27$1,651.29$876.98$0.00$303,976.72
1662040-07-01$2,528.27$1,646.54$881.73$0.00$303,094.99
1672040-08-01$2,528.27$1,641.76$886.51$0.00$302,208.48
1682040-09-01$2,528.27$1,636.96$891.31$0.00$301,317.17
1692040-10-01$2,528.27$1,632.13$896.14$0.00$300,421.03
1702040-11-01$2,528.27$1,627.28$900.99$0.00$299,520.04
1712040-12-01$2,528.27$1,622.40$905.87$0.00$298,614.17
1722041-01-01$2,528.27$1,617.49$910.78$0.00$297,703.39
1732041-02-01$2,528.27$1,612.56$915.71$0.00$296,787.68
1742041-03-01$2,528.27$1,607.60$920.67$0.00$295,867.01
1752041-04-01$2,528.27$1,602.61$925.66$0.00$294,941.35
1762041-05-01$2,528.27$1,597.60$930.67$0.00$294,010.68
1772041-06-01$2,528.27$1,592.56$935.71$0.00$293,074.97
1782041-07-01$2,528.27$1,587.49$940.78$0.00$292,134.19
1792041-08-01$2,528.27$1,582.39$945.88$0.00$291,188.31
1802041-09-01$2,528.27$1,577.27$951.00$0.00$290,237.31

Showing first 180 months. Click "Show all" to view the full schedule.

How the calculator works

  1. Standard payment (P&I): Computed using the fixed-rate mortgage formula. At a 0% note rate, payment is principal divided by months.
  2. Monthly iteration: For each month we compute interest as current balance × (note rate/12). The remainder of the standard payment reduces principal.
  3. Extra principal: One-time extras apply only on their specified month number. Recurring extras apply every month from Start Month # to End Month # (inclusive). Multiple entries of both types are supported and summed.
  4. Final month adjustment: If planned principal reduction (regular + extras) exceeds the remaining balance, we reduce extras first to avoid overpayment.
  5. Rounding: Each month's interest, principal, payment, and balance are rounded to cents to mimic statements.
  6. Comparisons: We compute a baseline schedule with no extras to show time and interest saved.

This tool is for planning/education only and does not constitute financial advice.

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