Blog

Modeling a Debt Schedule (that actually works)

Modeling a Debt Schedule (that actually works)

05/14/2026 6:50am 8 minute read Fundamentals

I'm not going to sugarcoat it... modeling the debt schedule is intimidating. In fact, even as a financial modeling instructor, I often have to brace... more »

The One-Pager: Wall Street goes full sail on AI

The One-Pager: Wall Street goes full sail on AI

05/07/2026 2:53pm 3 minute read The One-Pager

Welcome back to The One-Pager. I’m evolving this a bit – trying to make it even more skimmable. One big headline explained simply, a handful of... more »

The One-Pager: This Is Your Brain on AI

A title image for the One-Pager: this is your brain on AI.

04/23/2026 12:09pm 4 minute read The One-Pager

A quick roundup of the latest news in AI and financial modeling. Skim it, grab something useful, get on with your day. Remember the "this is your... more »

Are Financial Modeling Courses Worth It?

A person taking notes during at a desk while a financial modeling course is shown on screen.

04/23/2026 6:33am 7 minute read Fundamentals

I get asked this all the time: are financial modeling courses still worth it? This usually happens right after someone has seen a LinkedIn hype demo of... more »

Days Inventory On Hand: The Working Capital Metric That Drives Cash Conversion

Days Inventory On Hand: The Working Capital Metric That Drives Cash Conversion

04/17/2026 10:28am 10 minute read Fundamentals

Days Inventory On Hand (DOH) tells you how many days a company typically sits on its inventory before selling it. It's one of three metrics --... more »

The One-Pager: AI Just Moved Into Your Spreadsheet

Chris Reilly standing next to a laptop displaying a financial model, with text reading The One-Pager: AI just moved into your spreadsheet

04/08/2026 1:26pm 4 minute read

It's been almost a year since I've written a blog post but I'm back. This is something new I'm trying out -- a short post every couple weeks... more »

The Dangerous New Normal in Financial Modeling (Thanks to AI)

The Dangerous New Normal in Financial Modeling (Thanks to AI)

05/20/2025 12:56pm 4 minute read

Had a one-off call the other day. This person was struggling with a model -- the cash flow statement didn’t tie and the logic was all over the... more »

How to Avoid the Scenario Modeling Mess Everyone Falls Into

How to Avoid the Scenario Modeling Mess Everyone Falls Into

05/06/2025 11:41am 5 minute read

When people get into scenario modeling, things usually get messy. Sometimes it’s mild: extra output sections, bloated formulas, and messy IF... more »

Do You Know Your SaaS Net Magic Number? Here's Why It Matters

Do You Know Your SaaS Net Magic Number? Here's Why It Matters

04/15/2025 11:18am 5 minute read

Revenue growth is always the fancy, headline-grabbing number. But not everyone stops to ask: Was that growth efficient? Because if you’re spending $1... more »

I only use 3 “advanced” Excel formulas (less than 200 words)

I only use 3 “advanced” Excel formulas (less than 200 words)

04/01/2025 6:25am 2 minute read

I’m pretty good at Excel. But here’s the truth: I only use three advanced Excel formulas on a regular basis. Don’t get me wrong -- Excel... more »

Forget AI. Here's The Best Way to Learn Financial Modeling

Forget AI. Here's The Best Way to Learn Financial Modeling

03/25/2025 10:43am 4 minute read

I feel like we forget this a lot... Despite how much everyone is in love with AI these days, it can’t actually learn for you. Sure, AI can speed... more »

GRR vs NRR in SaaS Business Modeling

GRR vs NRR in SaaS Business Modeling

03/11/2025 7:04am 4 minute read

Today we're going to dive into the world of SaaS Metrics, and start off with something relatively simple: Gross Revenue Retention (or "GRR")... more »

SaaS Contracts in Financial Modeling

SaaS Contracts in Financial Modeling

02/26/2025 6:42am 9 minute read

In this issue of the "SaaS Model deep dive," I'm going to walk through all the different inputs I use to model various SaaS Contracts. (📱... more »

See the Layout of a SaaS Model

See the Layout of a SaaS Model

02/19/2025 7:11am 6 minute read

Building on previous posts, in the next several issues I'm going to walk through how I built the "SaaS Model" that I'm working on as part of... more »

There's No Such Thing as a SaaS Model

There's No Such Thing as a SaaS Model

02/11/2025 6:55am 8 minute read

You may not know this about me, but "financial modeling education" isn't my sole focus — I still do some good old fashioned... more »

Three Statement Model: If I Could Go Back and Change 1 Thing

Three Statement Model: If I Could Go Back and Change 1 Thing

01/22/2025 5:38am 7 minute read

Three Statement Model: I'm not going to bury the lead here. If I could go back and learn one thing, it would be this: learn the three statement model... more »

FYI: Your Boss Doesn’t Care Which Excel Function You Use

FYI: Your Boss Doesn’t Care Which Excel Function You Use

12/11/2024 5:25am 4 minute read

After seeing yet another "XLOOKUP vs VLOOKUP" battle on LinkedIn, posts about LET, LAMBDA, Dynamic Arrays, and AI, I think it's important to... more »

Financial Modeling Tech Stack for Excel

Financial Modeling Tech Stack for Excel

11/20/2024 5:28am 5 minute read

While I've said publicly that I use the mouse, you can't operate that way forever. You need some sweet Excel tech to speed things up. Here's my... more »

The 33-Hour Day That Changed How I Build Models

The 33-Hour Day That Changed How I Build Models

11/05/2024 11:44am 5 minute read

I didn't look as handsome at 2am. It was early 2010. I was a green Consultant in the wake of the Financial Crisis, and staffed on another... more »

Fitting a Private Equity Transaction on 1 Page

Fitting a Private Equity Transaction on 1 Page

10/29/2024 9:34am 12 minute read

A typical output from an LBO model, explaining all the key points about the transaction. I share this image a lot online because it's the... more »

9 Financial Modeling Tips I Wish I Had When I First Started

9 Financial Modeling Tips I Wish I Had When I First Started

10/01/2024 7:02am 6 minute read

Financial modeling tips: I've been building Financial Models for a long time. Interestingly enough, there are several "fundamental truths" I see... more »

Stacked Bar Chart to Visualize Working Capital

Stacked Bar Chart to Visualize Working Capital

09/10/2024 6:34am 3 minute read

If you work in Finance, most likely you’re familiar with the definition of Net Working Capital (NWC): NWC = Current Assets - Current Liabilities

Modeling a Private Equity Returns Waterfall

Modeling a Private Equity Returns Waterfall

09/05/2024 6:57am 7 minute read

One of the most complicated parts of your model is also one of the most important: modeling "Returns." "Returns" is the section of... more »

How I Update Actuals in the Model

cfo talking with analyst about how to update actuals in financial model

08/28/2024 5:46am 3 minute read

When it comes to updating the financials in your model each month, it should only take a few minutes. There might be other support schedules, KPIs, or... more »

Confession: I Never Did This…

Confession: I Never Did This…

08/20/2024 6:38am 5 minute read

I post on LinkedIn all the time about FP&A and building operating models for FP&A teams. Yet, I've never actually worked in... more »