Let me present it in another way as obviously I didn't make my message clear.
Let's put the following scenario:
$100k mortgage, 3%, amortized over 30 years. (monthly payment: $421.60)
HELOC, $10k, 4%
Case 1:
Normal amortization of the mortgage without any additional principal payment and no use of the HELOC.
At the end of year 1 your mortgage principal will be down to $97,912 and you would have paid during the year $5,059.25 consisting of $2,087 of principal and $2971 of interest.
payment |
principal |
interest |
balance |
|
|
1 |
($171.60) |
($250.00) |
$99,828.40 |
|
|
2 |
($172.03) |
($249.57) |
$99,656.36 |
|
|
3 |
($172.46) |
($249.14) |
$99,483.90 |
|
|
4 |
($172.89) |
($248.71) |
$99,311.01 |
|
|
5 |
($173.33) |
($248.28) |
$99,137.68 |
|
|
6 |
($173.76) |
($247.84) |
$98,963.92 |
|
|
7 |
($174.19) |
($247.41) |
$98,789.72 |
|
|
8 |
($174.63) |
($246.97) |
$98,615.10 |
|
|
9 |
($175.07) |
($246.54) |
$98,440.03 |
|
|
10 |
($175.50) |
($246.10) |
$98,264.52 |
|
|
11 |
($175.94) |
($245.66) |
$98,088.58 |
|
|
12 |
($176.38) |
($245.22) |
$97,912.20 |
|
|
|
($2,087.80) |
($2,971.45) |
|
|
($5,059.25) |
Case 2:
Your scenario, taking a 10k HELOC loan, that will be payed back in one year. The HELOC is used to pay the balance down of the mortgage to 90k.
With this scenario, the balance of the mortgage at the end of the year will be $87,608 and you would have payed $2,391 +10,000 of principal and only $2,667 of interest.
However at the same time, you would have paid back $10,000 of principal of your HELOC and $216 of interest.
So, out of pocket you would have to pay $15,275 that year.
|
mortgage |
|
|
|
HELOC |
|
|
|
|
payment |
principal |
interest |
balance |
|
principal |
interest |
balance |
|
|
1 |
($196.60) |
($225.00) |
$89,803.40 |
|
($833.33) |
($33.33) |
$9,166.67 |
|
|
2 |
($197.09) |
($224.51) |
$89,606.31 |
|
($833.33) |
($30.56) |
$8,333.33 |
|
|
3 |
($197.58) |
($224.02) |
$89,408.72 |
|
($833.33) |
($27.78) |
$7,500.00 |
|
|
4 |
($198.08) |
($223.52) |
$89,210.65 |
|
($833.33) |
($25.00) |
$6,666.67 |
|
|
5 |
($198.57) |
($223.03) |
$89,012.07 |
|
($833.33) |
($22.22) |
$5,833.33 |
|
|
6 |
($199.07) |
($222.53) |
$88,813.00 |
|
($833.33) |
($19.44) |
$5,000.00 |
|
|
7 |
($199.57) |
($222.03) |
$88,613.44 |
|
($833.33) |
($16.67) |
$4,166.67 |
|
|
8 |
($200.07) |
($221.53) |
$88,413.37 |
|
($833.33) |
($13.89) |
$3,333.33 |
|
|
9 |
($200.57) |
($221.03) |
$88,212.80 |
|
($833.33) |
($11.11) |
$2,500.00 |
|
|
10 |
($201.07) |
($220.53) |
$88,011.73 |
|
($833.33) |
($8.33) |
$1,666.67 |
|
|
11 |
($201.57) |
($220.03) |
$87,810.16 |
|
($833.33) |
($5.56) |
$833.33 |
|
|
12 |
($202.07) |
($219.53) |
$87,608.09 |
|
($833.33) |
($2.78) |
$0.00 |
|
|
|
($2,391.91) |
($2,667.29) |
|
|
($10,000.00) |
($216.67) |
|
|
($15,275.87) |
Case 3:
Instead of using the HELOC, you use the same $15,275 than in scenario 2, but you use it spread over 12 months to make additional payment to your mortgage.
At the end of the year you mortgage balance will be $87,555. Better than in case 2.
payment |
principal |
interest |
balance |
|
1 |
($1,022.89) |
($250.00) |
$98,977.11 |
|
2 |
($1,025.45) |
($247.44) |
$97,951.66 |
|
3 |
($1,028.01) |
($244.88) |
$96,923.65 |
|
4 |
($1,030.58) |
($242.31) |
$95,893.07 |
|
5 |
($1,033.16) |
($239.73) |
$94,859.91 |
|
6 |
($1,035.74) |
($237.15) |
$93,824.17 |
|
7 |
($1,038.33) |
($234.56) |
$92,785.84 |
|
8 |
($1,040.93) |
($231.96) |
$91,744.92 |
|
9 |
($1,043.53) |
($229.36) |
$90,701.39 |
|
10 |
($1,046.14) |
($226.75) |
$89,655.25 |
|
11 |
($1,048.75) |
($224.14) |
$88,606.50 |
|
12 |
($1,051.37) |
($221.52) |
$87,555.13 |
|
|
($12,444.87) |
($2,829.81) |
|
($15,274.68) |