How to Model SaaS Projections for Interviews

Hey WSO - this post is specifically for those of you in IB / Consulting who are interested in breaking into Software Buyout, Growth Buyout, Growth Equity, or Late Stage VC.

Now that I'm in the industry, I want to help you guys understand how to actually model out SaaS LBOs, based on Customer Cube data. There was so little information on this when I was recruiting and I had to piece together bits of wisdom from a wide range of posts to figure this out. It's a lot easier to wrap your head around when you can reference an actual example.

To pay it forward, I've put together a basic model that maps out Beg ARR, New Logo ARR, Upsell ARR, Downsell ARR, Churn ARR, and Ending ARR -- based on raw customer revenue data. You can see how this is all projected based on an assumed S&M spend, which is applied to an assumed CAC to get # of new Logos, which is multiplied against ACV to get your New Logo ARR in order to build out your ARR projection. From there, you can see how beg and ending ARR balances can be averaged out as a % of actual historical Revenue. After that - it's fairly standard % cost margins against revenue (except for S&M spend).

Note that this is just 1 basic way to model this out. However, this should be sufficient to land a software buyout associate role. You can use this as a start and build additional complexity in the model based on what you want to solve for (headcount planning, S&M driven by # Reps, New logos driven by Rep Attainment, etc). 

Comment below and I'll send you a link to the model in Google Sheets.

UPDATE: Due to high demand, I've removed the raw data and shared a simplified ARR -> Revenue Projection build in the link below. You can use this as the foundation to build your LBO model & add complexity. I should emphasize that you should understand the underlying assumptions for sales efficiency (Product Led Growth vs Enterprise Sales motion) - some thoughtful comments below I’d encourage yall to read through.

Link Here: https://docs.google.com/spreadsheets/d/1Q2dTXc0u7…

79 Comments
 

Interested but posting here for visibility: OP won't be able to send 35 DMs due to WSO limitations. Literally just post the link here.

 
[Comment removed by mod team]
 
Most Helpful

Out of an interest in giving back as well I might add some color since I am a software buyouts guy. When you look at something like S&M you should really think about what the cost is there. And for classic enterprise software (not PLG software) the cost is reps. And so another way to think about this is if you assume a certain path of rep productivity (ramp over 18 months) you can actually start with the number of reps you want to add (so part of S&M is a function of that) and then say OK we have capacity to bring on xyz amount of capital, what kind of return can we make on that given a certain rep productivity path. And then you also want to model out CAC, and say ok is this going to be the same, or is this a consumer internet business and CAC is going to quadruple in four years?

 

Having previously invested in and worked at a SaaS business as well as evaluated candidate case studies, happy to share some thoughts. The model shared is definitely very high level and correctly touches on the components that lead to revenue projections. However in terms of interviewing and possibly doing a case study/model test, there needs to be more concrete thoughts on how you're arriving to your ARR and revenue figures – a few examples would be whether the business is Enterprise or PLG driven (this would impact how you think about S&M in terms of seller productivity vs TOFU marketing spend and CAC), what SKUs/plans are offered and what does retention look like (which implies having a cohort waterfall built). 

 

This is a really useful resource for those interested in the aspects of LBO SaaS. I think that many will be grateful for your initiative and willingness to share knowledge. I will definitely study your model and perhaps even use it for my research and analysis. Good luck and thanks again!

 

Stumbled across this old thread while looking for LBO templates. Brings back memories of how painful it was to figure out these metrics from scratch. Having a clear ARR projection framework is a lifesaver. I managed to simplify my own workflow later by using MyOutreach for client data; it kept everything organized so I could focus on the modeling instead of just tracking numbers. 

 

This is a great resource to have on hand. Breaking down the ARR projections based on sales efficiency is a smart way to approach it.

 

Modeling SaaS LBOs can get complicated quickly, so having a base framework to start from is incredibly helpful for those trying to get into the space.

 

Appreciate you sharing this model. Understanding the differences between Product Led Growth and Enterprise Sales assumptions is definitely key when building these out.

 
[Comment removed by mod team]
 

Quam non minima autem laborum harum. Dolor soluta laudantium incidunt minus natus et est voluptas. Sapiente sed quae reprehenderit impedit. Repellendus suscipit id voluptatem quis quaerat. Mollitia et quis doloremque cumque.

 

Voluptas sit nobis distinctio illum. Ipsum iste fuga quasi voluptate velit provident. Distinctio est illum ut sit soluta.

Sit asperiores quae rem reiciendis eaque. Assumenda omnis quaerat aperiam culpa soluta eum quis pariatur. Est quae non in beatae ipsam. Ea voluptatem aliquam omnis mollitia.

Quidem deleniti laudantium quia consectetur suscipit nostrum consequuntur. Corporis dolore amet vel quia. Unde aut nostrum sunt autem. Beatae ab quae et qui nesciunt eos et. Quibusdam in dicta quis ab. Dolorum accusamus laborum recusandae rerum voluptates.

Et occaecati sed aliquam et dolores enim doloribus earum. Est placeat error ad debitis.

 

Distinctio occaecati qui est nemo et occaecati. Deleniti maxime accusamus distinctio. Voluptas quis voluptatem qui dolor eum aut at. Magnam molestiae id ut. Non ut itaque vel et nobis delectus. Vel molestiae rerum nesciunt doloremque consequatur dicta asperiores. Veniam atque est at quo dignissimos dolorum.

Magnam quae qui alias corrupti. In consequuntur facilis dicta qui et.

Eos provident quisquam illum in sit illo. Minus rerum modi vero et molestiae vero. Qui harum numquam culpa tempore voluptas distinctio laudantium. Est corrupti necessitatibus natus dolorum fuga nemo quo.

 

Commodi ut illo sapiente velit tempora. Quod nulla doloremque accusamus recusandae reiciendis asperiores. Unde quia in officia est consectetur iure. Aut fuga velit mollitia libero. Est velit harum inventore.

Sed est voluptatem laudantium ratione. Aut voluptas vero qui est fugiat. Alias odio voluptas aperiam enim sed. Reiciendis ad omnis sed odit voluptas. Ipsum minima officia itaque id dolores cupiditate.

Voluptatem dolor dignissimos quisquam qui dolor est. In aspernatur rerum nesciunt dolor in accusamus.

Quis minima cum non dolore. Magnam qui est dignissimos ipsam. Est ullam consequuntur placeat atque perspiciatis laborum dicta id.

Career Advancement Opportunities

September 2026 Private Equity

  • The Riverside Company 99.6%
  • Blackstone Group 99.3%
  • KKR (Kohlberg Kravis Roberts) 98.9%
  • Warburg Pincus 98.5%
  • Vista Equity Partners 98.1%

Overall Employee Satisfaction

September 2026 Private Equity

  • Blackstone Group 99.6%
  • KKR (Kohlberg Kravis Roberts) 99.2%
  • The Riverside Company 98.9%
  • Ardian 98.5%
  • Warburg Pincus 98.1%

Professional Growth Opportunities

September 2026 Private Equity

  • Bain Capital 99.6%
  • The Riverside Company 99.3%
  • Blackstone Group 98.9%
  • Starwood Capital Group 98.5%
  • KKR (Kohlberg Kravis Roberts) 98.1%

Total Avg Compensation

September 2026 Private Equity

  • Principal (9) $653
  • Director/MD (24) $547
  • Vice President (99) $363
  • 3rd+ Year Associate (106) $280
  • 2nd Year Associate (235) $272
  • 1st Year Associate (414) $231
  • 3rd+ Year Analyst (33) $157
  • 2nd Year Analyst (97) $134
  • 1st Year Analyst (273) $126
  • Intern/Summer Associate (38) $81
  • Intern/Summer Analyst (355) $61
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
BankonBanking's picture
BankonBanking
99.0
3
Secyh62's picture
Secyh62
99.0
4
kanon's picture
kanon
99.0
5
CompBanker's picture
CompBanker
98.9
6
DrApeman's picture
DrApeman
98.9
7
Betsy Massar's picture
Betsy Massar
98.9
8
dosk17's picture
dosk17
98.9
9
GameTheory's picture
GameTheory
98.9
10
Linda Abraham's picture
Linda Abraham
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...”