Why Adding an Interest Reserve at Closing Protects Your Cash Flow

Question

When flipping houses, liquid cash is a necessity. One of the simplest ways experienced flippers protect working capital is funding an interest reserve at closing.

Instead of paying your monthly hard money or private loan interest out of pocket, an interest reserve sets aside 3 to 6+ months of debt service into an escrow account at closing. The lender then draws monthly payments directly from that reserve.

A few reasons this is worth considering on your next deal:

• Eliminates Payment Management & Default Risk: Automated draws mean zero risk of late fees, missed payments, or accidental technical defaults while you are focused on site management.
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• Strengthens Underwriting & Lender Terms: Private and hard money lenders view interest reserves as a major risk mitigator. Showing liquidity to fund a reserve, or financing one into the loan can sometimes help secure higher leverage or better points.
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Eliminates Payment Management & Default Risk: Automated draws mean zero risk of late fees, missed payments, or accidental technical defaults while you are focused on site management.

Strengthens Underwriting & Lender Terms: Private and hard money lenders view interest reserves as a major risk mitigator. Showing liquidity to fund a reserve, or financing one into the loan can sometimes help secure higher leverage or better points.

The down side: If the interest reserve is rolled into your total loan balance, you will pay interest on those reserve funds. However, for most operators, paying a negligible amount of extra interest is a cheap insurance policy compared to running out of cash mid-build.

Do you structure interest reserves into your loans, or do you prefer keeping your total loan balance minimal and paying out of pocket monthly? Lenders: Do you mandate reserves on certain rehab scopes?

Evan Polaski · Answer

There are only a few situations I see these as a net benefit, and primarily only if the lender is offering a better rate on the loan by holding their own reserves.

For my loans, I have limits at both LTV of ARV and actual cost, with proceeds being tied to the lower of the two.  So, effectively, funding an interest reserve doesn't really net me more cash.  It reduces my overall loan capacity by the reserve amount.  Additionally, having this interest reserve specifically tied to one expense bucket, reduces my overall liquidity even further, because I can't draw to pay the electrician like I could from a general construction escrow.

At the end of the day, I look at my cash position and my available loan capacity.  My lender funds draws in 1-2 days, so draws are effectively just as liquid as having cash in the bank.  But having an interest reserve built in does not provide my any real benefit, in most real world situations.

Like I mentioned above, if the interest reserve allows me a lower rate, that would be one benefit.  Or, if the interest reserve is over and above any capacity that I would otherwise get unrestricted, that would be another benefit.  But thus far my lenders have never offered either of these options.

Diana Khan · Answer

@Patrick Babich, I’ve seen how quickly a rehab can put pressure on cash when the project takes longer than expected, so I understand why an interest reserve can be useful. The part I would always look at closely is how that reserve is actually written into the loan. I would want to know whether it is part of the total loan amount, when the lender can use it, what happens if the project runs past the reserve period, and what happens to any money left over if the loan pays off early.

I also think the reserve should match the real timeline, not just the best-case timeline. A three-month reserve may look fine on paper, but if permits, inspections, contractors, or the sale take longer, the borrower can still end up paying out of pocket at the worst time. I like conversations like this because the financing structure can make just as much difference as the rehab budget once the project is underway.