Variable Mortgage Payment Scheduler with Extra Payments and Offset Account

Daburger

New Member
Joined
Jul 15, 2021
Messages
15
Office Version
  1. 365
Platform
  1. Windows
  2. Mobile
Hi Everyone,

With the way things have become over the past few years, I decided to use my time wisely and started to keep a tab on a few things, one of which is my mortgage. However, I wanted something much more in depth and struggled to find much, specially when it came to variable loan (with first 3 years were fixed).

So I decided to make a calculator/scheduler where I can record all the payments I will need to make for the life of the loan and what the interest rate would be at the time of the payment. Up the top left of the table below, I have a list of different rates, and which fortnight it went up. This way I can see the changes and effects it has on future payments etc.

The issue I am having is extra payments and offset savings (extra payments is more of the priority to figure out) which are highlighted in red.
In the mini sheet below, I want the extra payments to be deducted correctly, but without affecting the Repayment as I believe it's not meant to, but don't quote me on that.
I also have a section on the sheet called "Extra Payment Savings". Basically I want this little cell to show me how much I have saved with the repayments that have been made (a way of encouragement).

Lastly, Offset Amounts. This field in the table will be calculated based on the "Offset Account Amount" up the top left of the sheet and the current interest rate.
So far, the formulas I have used I had help with before, but that help is currently unavailable. So I am really at a loss. I appreciate any assistance!

FYI, I wasn't able to add the whole list as I am collecting data bi-weekly, but I should be able to apply what's needed to the rest....I hope! Thanks again for the help.

test.xlsx
ABCDEFGHIJKLMNOPQRSTUV
14/09/2022Home Mortgage Calculator
2
3Bi-Weekly:Interest Rate:Repayment:Offset Amount:Interest Paid:Principal Paid:Extra Repayments:Balance:
403.00%$500,000.00
5Loan Amount:$500,000.00Avergae Monthly Payment:$1,333.8019/04/201913.00%$972.53$576.92$395.61$499,604.39
6Offset Account Amount:$20,000.00Total Cost:$1,040,364.473/05/201923.00%$972.53$576.47$396.06$499,208.33
7Loan Term (years):30Total Interest:$540,364.4717/05/201933.00%$972.53$576.01$396.52$498,811.81
8how many years into loan ---->Current Term (years):531/05/201943.00%$972.53$575.55$396.98$498,414.83
9Total of Extra Payments:$3,500.0014/06/201953.00%$972.53$575.09$397.44$498,017.40
10Date Change:Bi-WeeklyInterest Rates:Extra Payment Savings:28/06/201963.00%$972.53$574.64$397.89$497,619.51
1103.00%12/07/201973.00%$972.53$574.18$398.35$497,221.15
1215th April 2022324.00%26/07/201983.00%$972.53$573.72$398.81$496,822.34
138th July 2022485.00%9/08/201993.00%$972.53$573.26$399.27$496,423.07
1419th August 2022536.15%23/08/2019103.00%$972.53$572.80$399.73$496,023.34
1516th September 20226/09/2019113.00%$972.53$572.33$400.19$495,623.14
1620/09/2019123.00%$972.53$571.87$400.66$2,000.00$495,222.48
174/10/2019133.00%$972.53$571.41$401.12$494,821.37
1818/10/2019143.00%$972.53$570.95$401.58$494,419.78
191/11/2019153.00%$972.53$570.48$402.04$494,017.74
2015/11/2019163.00%$972.53$570.02$402.51$493,615.23
2129/11/2019173.00%$972.53$569.56$402.97$493,212.26
2213/12/2019183.00%$972.53$569.09$403.44$492,808.82
2327/12/2019193.00%$972.53$568.63$403.90$492,404.92
2410/01/2020203.00%$972.53$568.16$404.37$492,000.55
2524/01/2020213.00%$972.53$567.69$404.84$491,595.71
267/02/2020223.00%$972.53$567.23$405.30$491,190.41
2721/02/2020233.00%$972.53$566.76$405.77$490,784.64
286/03/2020243.00%$972.53$566.29$406.24$490,378.40
2920/03/2020253.00%$972.53$565.82$406.71$489,971.69
303/04/2020263.00%$972.53$565.35$407.18$489,564.51
3117/04/2020273.00%$972.53$564.88$407.65$489,156.87
321/05/2020283.00%$972.53$564.41$408.12$488,748.75
3315/05/2020293.00%$972.53$563.94$408.59$488,340.16
3429/05/2020303.00%$972.53$563.47$409.06$487,931.10
3512/06/2020313.00%$972.53$563.00$409.53$487,521.57
3626/06/2020324.00%$1,096.84$750.03$346.81$487,174.76
3710/07/2020334.00%$1,096.84$749.50$347.34$486,827.42
3824/07/2020344.00%$1,096.84$748.97$347.87$486,479.55
397/08/2020354.00%$1,096.84$748.43$348.41$486,131.14
4021/08/2020364.00%$1,096.84$747.89$348.95$1,000.00$485,782.19
414/09/2020374.00%$1,096.84$747.36$349.48$485,432.71
4218/09/2020384.00%$1,096.84$746.82$350.02$485,082.69
432/10/2020394.00%$1,096.84$746.28$350.56$484,732.13
4416/10/2020404.00%$1,096.84$745.74$351.10$484,381.04
4530/10/2020414.00%$1,096.84$745.20$351.64$484,029.40
4613/11/2020424.00%$1,096.84$744.66$352.18$483,677.22
4727/11/2020434.00%$1,096.84$744.12$352.72$483,324.50
4811/12/2020444.00%$1,096.84$743.58$353.26$500.00$482,971.24
4925/12/2020454.00%$1,096.84$743.03$353.81$482,617.43
508/01/2021464.00%$1,096.84$742.49$354.35$482,263.08
5122/01/2021474.00%$1,096.84$741.94$354.90$481,908.18
525/02/2021485.00%$1,226.78$926.75$300.03$481,608.15
5319/02/2021495.00%$1,226.78$926.17$300.61$481,307.55
545/03/2021505.00%$1,226.78$925.59$301.19$481,006.36
5519/03/2021515.00%$1,226.78$925.01$301.76$480,704.60
562/04/2021525.00%$1,226.78$924.43$302.35$480,402.25
5716/04/2021536.15%$1,384.21$1,136.34$247.87$480,154.38
5830/04/2021546.15%$1,384.21$1,135.75$248.46$479,905.92
Sheet1
Cell Formulas
RangeFormula
A1A1=TODAY()
P4:P58P4=VLOOKUP(O4,$E$11:$F$20,2,TRUE)
O5:O58O5=O4+1
Q5:Q58Q5=-PMT(P5/26,781-O5,V4)
S5:S58S5=V4*P5/26
T5:T58T5=Q5-S5
N6:N58N6=N5+2*7
K5K5=AVERAGE(Q5:Q364)
K6K6=K5*F7*26
K7K7=K6-F5
K9K9=SUM(U4:U784)
V4V4=F5
V5:V58V5=V4-T5
 

Excel Facts

Workdays for a market open Mon, Wed, Friday?
Yes! Use "0101011" for the weekend argument in NETWORKDAYS.INTL or WORKDAY.INTL. The 7 digits start on Monday. 1 means it is a weekend.
Is the payment not fixed? You are reducing the term and calculating a new payment amount with each payment.
The extra payments are deducted from the principal.

You will have to provide information on the Offset Account amount purpose and calculations before we can make any comments.

N.B. We do not know the rules and regulations in your area.
Do NOT use merged cells

For the savings, you could maintain two sheets or have distinct calculations deducting or not deducting the extra payments.

Cell Formulas
RangeFormula
P4:P16P4=VLOOKUP(O4,$E$11:$F$20,2,TRUE)
O5:O16O5=O4+1
Q5Q5=-PMT(P5/26,30*26,V4)
S5:S16S5=V4*P5/26
T5:T16T5=Q5-S5
N6:N16N6=N5+2*7
Q6:Q16Q6=$Q$5
V4V4=F5
V5:V16V5=V4-T5-U5
 
Upvote 0
When are the mortgage payments adjusted? At the end of each 5 years? When interest rates change? or
 
Upvote 0
I edited some of your formulas.
Please answer the questions in post 2 and 3 and review the following.

Cell Formulas
RangeFormula
O5:O23O5=O4+1
P5:P23P5=VLOOKUP(N5,$D$11:$F$20,3,1)
Q5Q5=PMT(P5/26,30*26,-F5)
N6:N23N6=N5+14
Q6:Q23Q6=IF(P6=P5,Q5,PMT(P6/26,780-O5,-U5))
K6K6=SUM(Q5:Q784,T5:T784)
K7K7=SUM(S5:S784)
K9K9=SUM(T4:T784)
K10K10=K23-K7
E12:E14E12=(D12-$D$11)/14
K21K21=SUM('4aa'!Q5:Q784)
L21L21=K21-K6
K23K23=SUM('4aa'!S5:S784)
L23L23=K23-K7
S5:S23S5=U4*P5/26
U4U4=F5
U5:U23U5=U4-Q5+S5-T5
 
Last edited:
Upvote 0
I am so sorry for the delayed response. I have been away on leave for the past few weeks and didn't get a chance to respond. I will try this out tonight! Thanks again so very much!
 
Upvote 0

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