In: Finance
You take out a 30-year $200,000 mortgage loan with an APR (monthly) of 4.5% and monthly payments. In 12 years you decide to sell your house and pay off the mortgage. What is the principal balance on the loan?
monthly payment formula= [P * r x (1+r)^n]/[((1+r)^n)-1]
P= Loan amount=$200,000
r= interest rate per month=4.5%/12=0.375%
n=total number of periods=(30*12)=360
monthly payment=200000*0.375%*((1+0.375%)^360)/(((1+0.375%)^360)-1)=(750*3.847698)/2.847698=$1013.4
| Periods | Opening balance | Monthly payment | Interest=(Opening balance*(4.5%/12)) | Principal=monthly payment-Interest | Ending balance=Opening balance-principal |
| 1 | 200000.0 | 1013.4 | 750.0 | 263.4 | 199736.6 |
| 2 | 199736.6 | 1013.4 | 749.0 | 264.4 | 199472.3 |
| 3 | 199472.3 | 1013.4 | 748.0 | 265.3 | 199206.9 |
| 4 | 199206.9 | 1013.4 | 747.0 | 266.3 | 198940.6 |
| 5 | 198940.6 | 1013.4 | 746.0 | 267.3 | 198673.2 |
| 6 | 198673.2 | 1013.4 | 745.0 | 268.3 | 198404.9 |
| 7 | 198404.9 | 1013.4 | 744.0 | 269.4 | 198135.5 |
| 8 | 198135.5 | 1013.4 | 743.0 | 270.4 | 197865.2 |
| 9 | 197865.2 | 1013.4 | 742.0 | 271.4 | 197593.8 |
| 10 | 197593.8 | 1013.4 | 741.0 | 272.4 | 197321.4 |
| 11 | 197321.4 | 1013.4 | 740.0 | 273.4 | 197048.0 |
| 12 | 197048.0 | 1013.4 | 738.9 | 274.4 | 196773.5 |
| 13 | 196773.5 | 1013.4 | 737.9 | 275.5 | 196498.1 |
| 14 | 196498.1 | 1013.4 | 736.9 | 276.5 | 196221.6 |
| 15 | 196221.6 | 1013.4 | 735.8 | 277.5 | 195944.0 |
| 16 | 195944.0 | 1013.4 | 734.8 | 278.6 | 195665.5 |
| 17 | 195665.5 | 1013.4 | 733.7 | 279.6 | 195385.8 |
| 18 | 195385.8 | 1013.4 | 732.7 | 280.7 | 195105.2 |
| 19 | 195105.2 | 1013.4 | 731.6 | 281.7 | 194823.4 |
| 20 | 194823.4 | 1013.4 | 730.6 | 282.8 | 194540.6 |
| 21 | 194540.6 | 1013.4 | 729.5 | 283.8 | 194256.8 |
| 22 | 194256.8 | 1013.4 | 728.5 | 284.9 | 193971.9 |
| 23 | 193971.9 | 1013.4 | 727.4 | 286.0 | 193685.9 |
| 24 | 193685.9 | 1013.4 | 726.3 | 287.0 | 193398.9 |
| 25 | 193398.9 | 1013.4 | 725.2 | 288.1 | 193110.7 |
| 26 | 193110.7 | 1013.4 | 724.2 | 289.2 | 192821.5 |
| 27 | 192821.5 | 1013.4 | 723.1 | 290.3 | 192531.3 |
| 28 | 192531.3 | 1013.4 | 722.0 | 291.4 | 192239.9 |
| 29 | 192239.9 | 1013.4 | 720.9 | 292.5 | 191947.4 |
| 30 | 191947.4 | 1013.4 | 719.8 | 293.6 | 191653.8 |
| 31 | 191653.8 | 1013.4 | 718.7 | 294.7 | 191359.2 |
| 32 | 191359.2 | 1013.4 | 717.6 | 295.8 | 191063.4 |
| 33 | 191063.4 | 1013.4 | 716.5 | 296.9 | 190766.5 |
| 34 | 190766.5 | 1013.4 | 715.4 | 298.0 | 190468.5 |
| 35 | 190468.5 | 1013.4 | 714.3 | 299.1 | 190169.4 |
| 36 | 190169.4 | 1013.4 | 713.1 | 300.2 | 189869.2 |
| 37 | 189869.2 | 1013.4 | 712.0 | 301.4 | 189567.8 |
| 38 | 189567.8 | 1013.4 | 710.9 | 302.5 | 189265.3 |
| 39 | 189265.3 | 1013.4 | 709.7 | 303.6 | 188961.7 |
| 40 | 188961.7 | 1013.4 | 708.6 | 304.8 | 188656.9 |
| 41 | 188656.9 | 1013.4 | 707.5 | 305.9 | 188351.0 |
| 42 | 188351.0 | 1013.4 | 706.3 | 307.1 | 188044.0 |
| 43 | 188044.0 | 1013.4 | 705.2 | 308.2 | 187735.8 |
| 44 | 187735.8 | 1013.4 | 704.0 | 309.4 | 187426.4 |
| 45 | 187426.4 | 1013.4 | 702.8 | 310.5 | 187115.9 |
| 46 | 187115.9 | 1013.4 | 701.7 | 311.7 | 186804.2 |
| 47 | 186804.2 | 1013.4 | 700.5 | 312.9 | 186491.3 |
| 48 | 186491.3 | 1013.4 | 699.3 | 314.0 | 186177.3 |
| 49 | 186177.3 | 1013.4 | 698.2 | 315.2 | 185862.1 |
| 50 | 185862.1 | 1013.4 | 697.0 | 316.4 | 185545.7 |
| 51 | 185545.7 | 1013.4 | 695.8 | 317.6 | 185228.1 |
| 52 | 185228.1 | 1013.4 | 694.6 | 318.8 | 184909.4 |
| 53 | 184909.4 | 1013.4 | 693.4 | 320.0 | 184589.4 |
| 54 | 184589.4 | 1013.4 | 692.2 | 321.2 | 184268.2 |
| 55 | 184268.2 | 1013.4 | 691.0 | 322.4 | 183945.9 |
| 56 | 183945.9 | 1013.4 | 689.8 | 323.6 | 183622.3 |
| 57 | 183622.3 | 1013.4 | 688.6 | 324.8 | 183297.5 |
| 58 | 183297.5 | 1013.4 | 687.4 | 326.0 | 182971.5 |
| 59 | 182971.5 | 1013.4 | 686.1 | 327.2 | 182644.3 |
| 60 | 182644.3 | 1013.4 | 684.9 | 328.5 | 182315.8 |
| 61 | 182315.8 | 1013.4 | 683.7 | 329.7 | 181986.1 |
| 62 | 181986.1 | 1013.4 | 682.4 | 330.9 | 181655.2 |
| 63 | 181655.2 | 1013.4 | 681.2 | 332.2 | 181323.1 |
| 64 | 181323.1 | 1013.4 | 680.0 | 333.4 | 180989.7 |
| 65 | 180989.7 | 1013.4 | 678.7 | 334.7 | 180655.0 |
| 66 | 180655.0 | 1013.4 | 677.5 | 335.9 | 180319.1 |
| 67 | 180319.1 | 1013.4 | 676.2 | 337.2 | 179981.9 |
| 68 | 179981.9 | 1013.4 | 674.9 | 338.4 | 179643.5 |
| 69 | 179643.5 | 1013.4 | 673.7 | 339.7 | 179303.8 |
| 70 | 179303.8 | 1013.4 | 672.4 | 341.0 | 178962.8 |
| 71 | 178962.8 | 1013.4 | 671.1 | 342.3 | 178620.5 |
| 72 | 178620.5 | 1013.4 | 669.8 | 343.5 | 178277.0 |
| 73 | 178277.0 | 1013.4 | 668.5 | 344.8 | 177932.1 |
| 74 | 177932.1 | 1013.4 | 667.2 | 346.1 | 177586.0 |
| 75 | 177586.0 | 1013.4 | 665.9 | 347.4 | 177238.6 |
| 76 | 177238.6 | 1013.4 | 664.6 | 348.7 | 176889.9 |
| 77 | 176889.9 | 1013.4 | 663.3 | 350.0 | 176539.8 |
| 78 | 176539.8 | 1013.4 | 662.0 | 351.3 | 176188.5 |
| 79 | 176188.5 | 1013.4 | 660.7 | 352.7 | 175835.8 |
| 80 | 175835.8 | 1013.4 | 659.4 | 354.0 | 175481.8 |
| 81 | 175481.8 | 1013.4 | 658.1 | 355.3 | 175126.5 |
| 82 | 175126.5 | 1013.4 | 656.7 | 356.6 | 174769.9 |
| 83 | 174769.9 | 1013.4 | 655.4 | 358.0 | 174411.9 |
| 84 | 174411.9 | 1013.4 | 654.0 | 359.3 | 174052.6 |
| 85 | 174052.6 | 1013.4 | 652.7 | 360.7 | 173691.9 |
| 86 | 173691.9 | 1013.4 | 651.3 | 362.0 | 173329.9 |
| 87 | 173329.9 | 1013.4 | 650.0 | 363.4 | 172966.5 |
| 88 | 172966.5 | 1013.4 | 648.6 | 364.7 | 172601.7 |
| 89 | 172601.7 | 1013.4 | 647.3 | 366.1 | 172235.6 |
| 90 | 172235.6 | 1013.4 | 645.9 | 367.5 | 171868.1 |
| 91 | 171868.1 | 1013.4 | 644.5 | 368.9 | 171499.3 |
| 92 | 171499.3 | 1013.4 | 643.1 | 370.2 | 171129.0 |
| 93 | 171129.0 | 1013.4 | 641.7 | 371.6 | 170757.4 |
| 94 | 170757.4 | 1013.4 | 640.3 | 373.0 | 170384.4 |
| 95 | 170384.4 | 1013.4 | 638.9 | 374.4 | 170009.9 |
| 96 | 170009.9 | 1013.4 | 637.5 | 375.8 | 169634.1 |
| 97 | 169634.1 | 1013.4 | 636.1 | 377.2 | 169256.9 |
| 98 | 169256.9 | 1013.4 | 634.7 | 378.7 | 168878.2 |
| 99 | 168878.2 | 1013.4 | 633.3 | 380.1 | 168498.1 |
| 100 | 168498.1 | 1013.4 | 631.9 | 381.5 | 168116.6 |
| 101 | 168116.6 | 1013.4 | 630.4 | 382.9 | 167733.7 |
| 102 | 167733.7 | 1013.4 | 629.0 | 384.4 | 167349.3 |
| 103 | 167349.3 | 1013.4 | 627.6 | 385.8 | 166963.5 |
| 104 | 166963.5 | 1013.4 | 626.1 | 387.3 | 166576.2 |
| 105 | 166576.2 | 1013.4 | 624.7 | 388.7 | 166187.5 |
| 106 | 166187.5 | 1013.4 | 623.2 | 390.2 | 165797.4 |
| 107 | 165797.4 | 1013.4 | 621.7 | 391.6 | 165405.7 |
| 108 | 165405.7 | 1013.4 | 620.3 | 393.1 | 165012.6 |
| 109 | 165012.6 | 1013.4 | 618.8 | 394.6 | 164618.1 |
| 110 | 164618.1 | 1013.4 | 617.3 | 396.1 | 164222.0 |
| 111 | 164222.0 | 1013.4 | 615.8 | 397.5 | 163824.5 |
| 112 | 163824.5 | 1013.4 | 614.3 | 399.0 | 163425.4 |
| 113 | 163425.4 | 1013.4 | 612.8 | 400.5 | 163024.9 |
| 114 | 163024.9 | 1013.4 | 611.3 | 402.0 | 162622.9 |
| 115 | 162622.9 | 1013.4 | 609.8 | 403.5 | 162219.4 |
| 116 | 162219.4 | 1013.4 | 608.3 | 405.0 | 161814.3 |
| 117 | 161814.3 | 1013.4 | 606.8 | 406.6 | 161407.7 |
| 118 | 161407.7 | 1013.4 | 605.3 | 408.1 | 160999.6 |
| 119 | 160999.6 | 1013.4 | 603.7 | 409.6 | 160590.0 |
| 120 | 160590.0 | 1013.4 | 602.2 | 411.2 | 160178.9 |
| 121 | 160178.9 | 1013.4 | 600.7 | 412.7 | 159766.2 |
| 122 | 159766.2 | 1013.4 | 599.1 | 414.2 | 159351.9 |
| 123 | 159351.9 | 1013.4 | 597.6 | 415.8 | 158936.1 |
| 124 | 158936.1 | 1013.4 | 596.0 | 417.4 | 158518.8 |
| 125 | 158518.8 | 1013.4 | 594.4 | 418.9 | 158099.8 |
| 126 | 158099.8 | 1013.4 | 592.9 | 420.5 | 157679.3 |
| 127 | 157679.3 | 1013.4 | 591.3 | 422.1 | 157257.3 |
| 128 | 157257.3 | 1013.4 | 589.7 | 423.7 | 156833.6 |
| 129 | 156833.6 | 1013.4 | 588.1 | 425.2 | 156408.4 |
| 130 | 156408.4 | 1013.4 | 586.5 | 426.8 | 155981.5 |
| 131 | 155981.5 | 1013.4 | 584.9 | 428.4 | 155553.1 |
| 132 | 155553.1 | 1013.4 | 583.3 | 430.0 | 155123.0 |
| 133 | 155123.0 | 1013.4 | 581.7 | 431.7 | 154691.4 |
| 134 | 154691.4 | 1013.4 | 580.1 | 433.3 | 154258.1 |
| 135 | 154258.1 | 1013.4 | 578.5 | 434.9 | 153823.2 |
| 136 | 153823.2 | 1013.4 | 576.8 | 436.5 | 153386.7 |
| 137 | 153386.7 | 1013.4 | 575.2 | 438.2 | 152948.5 |
| 138 | 152948.5 | 1013.4 | 573.6 | 439.8 | 152508.7 |
| 139 | 152508.7 | 1013.4 | 571.9 | 441.5 | 152067.2 |
| 140 | 152067.2 | 1013.4 | 570.3 | 443.1 | 151624.1 |
| 141 | 151624.1 | 1013.4 | 568.6 | 444.8 | 151179.3 |
| 142 | 151179.3 | 1013.4 | 566.9 | 446.4 | 150732.9 |
| 143 | 150732.9 | 1013.4 | 565.2 | 448.1 | 150284.8 |
| 144 | 150284.8 | 1013.4 | 563.6 | 449.8 | 149834.9 |
The principal amount of the loan at the end of 12 years (144 months)=$149,834.9