Finding Origional Loan Based on Current Principal Balance in Excel

Gentlemen,

I am getting a little jammed up on this and am very curious if anyone can figure it out.

I am looking to create a clean model to back into an origional loan balance based on a principal balance at X year into 30 year ammortization.

example:

The principal balance 5 years into a 30 year am loan using a 4.5% rate is $911,579.20, what was the origional loan balance?

How would you back into this?

Note:

  • I am able to quickly do this on my HP12c but haven’t figured out a clean way to do it in excel.

  • The principle balance on a $1mm loan 5 years into the term @ 4.5% rate is $911,579.20 (using =cumprinc()).

Thanks in advance.

2 Comments
 

What you do is:

=PV(4.5%/12months, 360months, PMT(4.5%/12months, 360months-60months, $911,579.20))

Basically you are calculating the payment amounts by taking current principal amount, and using the 360 month amortization minus the current month (in this case, month 60 since it is year 5)

You can tie the "60months" in the formula to an input, where you can adjust the X years into the loan.

 

Maxime facere omnis quibusdam qui aspernatur est. Incidunt fugiat laborum rerum. Ipsam eaque aut voluptatem aut qui. Voluptas corrupti sunt eveniet cupiditate autem. Est unde blanditiis placeat magni delectus. Error asperiores modi occaecati vel.

Molestiae voluptas quaerat sit in veniam in eligendi. Et voluptates voluptates adipisci reiciendis veniam rerum. Veniam praesentium nobis alias ut.

Illo veniam nihil in enim sed optio. Aliquid quia explicabo ea voluptatem molestiae. Qui non earum quidem itaque.

Iusto sapiente ut nesciunt iste eligendi asperiores. Et explicabo libero dolorem a unde laboriosam possimus.

Career Advancement Opportunities

June 2026 Investment Banking

  • Evercore 01 99.4%
  • Moelis & Company 01 98.8%
  • JPMorgan 01 98.2%
  • Guggenheim Partners 01 97.7%
  • Morgan Stanley 07 97.1%

Overall Employee Satisfaction

June 2026 Investment Banking

  • Moelis & Company No 99.4%
  • Morgan Stanley 01 98.8%
  • Evercore 01 98.2%
  • BMO Capital Markets 12 97.6%
  • Banco Santander 01 97.1%

Professional Growth Opportunities

June 2026 Investment Banking

  • Moelis & Company No 99.4%
  • Evercore No 98.8%
  • Morgan Stanley 05 98.2%
  • JPMorgan No 97.7%
  • BMO Capital Markets 12 97.1%

Total Avg Compensation

June 2026 Investment Banking

  • Vice President (14) $434
  • Associates (43) $259
  • 3rd+ Year Analyst (8) $210
  • 2nd Year Analyst (22) $179
  • Intern/Summer Associate (13) $156
  • 1st Year Analyst (75) $151
  • Intern/Summer Analyst (67) $101
notes
16 IB Interviews Notes

“... there’s no excuse to not take advantage of the resources out there available to you. Best value for your $ are the...”

Leaderboard

1
redever's picture
redever
99.2
2
kanon's picture
kanon
99.0
3
BankonBanking's picture
BankonBanking
99.0
4
Secyh62's picture
Secyh62
99.0
5
DrApeman's picture
DrApeman
98.9
6
Betsy Massar's picture
Betsy Massar
98.9
7
GameTheory's picture
GameTheory
98.9
8
dosk17's picture
dosk17
98.9
9
CompBanker's picture
CompBanker
98.9
10
Jamoldo's picture
Jamoldo
98.8
success
From 10 rejections to 1 dream investment banking internship

“... I believe it was the single biggest reason why I ended up with an offer...”