What else should a flip analyzer calculate?

Question

I’ve been working on a flip calculator that breaks down holding costs (loan interest, property tax, insurance, utilities, HOA) and calculates profit/ROI. Based on feedback here, I added the detailed cost breakdown.

For experienced flippers - what am I still missing that would make this actually useful for evaluating deals?

Thinking about adding:

• Selling costs (commission, closing fees)

• Annualized ROI (to compare deals with different timelines)

• Sensitivity analysis (“what if ARV drops 10%?”)

What would you prioritize? Or is there something else that matters more?

[If people ask to see it, I can share the link in comments]

William Whitley · Answer

Joshua,

It’s definitely smart to track budget vs. actual throughout the renovation. The key is staying aware of where you stand at any point in the project, both on renovation costs and total project costs.

Going over budget is one thing; going over without realizing it is far worse. You can’t always prevent overruns, but knowing about them in real time gives you a chance to adjust your strategy or even recoup some costs at resale.

It’s also important to keep your bookkeeping current from purchase through resale so you know where you are throughout the project.

As for the contingency, I recommend estimating renovation costs using a range for each line item on your punch list, then leaning toward the higher end of that range. From there, you can add an additional 10–15% contingency on top. You may not always be able to negotiate a perfect purchase price to make every number line up, but this approach gives you clarity. At least you will know whether the deal still makes sense before you commit to the purchase.

Max Emory · Answer

@Joshua Rodriguez congrats on getting into flipping!

Most of our bookkeeping clients are flippers and they're crushing it despite interest rates and home prices right now.

Agree 100% with @William Whitley. Account for a hefty reserve for holding costs and your rehab. That's where I've personally been bitten in the past when I was an active REI and some of our clients still get bit in that area. The % your choose will depend on your risk tolerance but I like ~20% buffer for holding costs if your timeline gets extended and ~20%+ for your rehab for the items that the home inspection or walking the property doesn't catch that inevitably pop up.

Hope that helps!

- Time Capital Bookkeeping (REI since 2019)

William Whitley · Answer

Good evening, Joshua,

From the initial purchase to the final sale, there are a lot of expenses to account for. But the most important thing to remember is this: you don’t make your profit when you sell the flip; you make it when you buy it. If you overpay on the front end, you have already started at a disadvantage.

You’ve covered the main categories very well: purchase and acquisition costs, holding costs, and selling costs. I’d also emphasize renovation costs, since going over budget there can quickly eat into your profit. And definitely include a contingency reserve for unexpected issues that come up during the project.

Overall, it sounds like your calculator is shaping up to be a really useful tool for analyzing deals realistically.

All the best!

Bill Whitley

Joshua Rodriguez · Answer

@Max Emory Appreciate the buffer tip - that’s solid advice. I’m actually building a flip analysis tool right now and trying to make sure it solves real problems. What do your flipper clients struggle with most when they’re analyzing deals upfront? Always looking to learn from people who see this stuff regularly.

What else should a flip analyzer calculate?

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