Interest Reserves on Ground-Up Construction Loans: A Broker's Guide

Your client is staring at two term sheets. Same land, same budget, same builder. One quote is five points lower than the other. Nine times out of ten, the difference isn't the rate. It's whether the interest reserve sits on top of the leverage cap or gets buried inside it.

Most brokers gloss over this line item because it looks like paperwork. It isn't. It's the difference between a builder who closes with real construction dollars and one who finds out at draw three that the number he modeled was never available.

What the Reserve Actually Does

An interest reserve is a pool of loan funds set aside at closing to automatically pay the borrower's monthly interest charges during a construction or bridge loan draw period. The borrower doesn't receive that portion as spendable cash; it sits in a dedicated sub-account that the lender controls. The building isn't generating income yet, so there's no rent check or sale proceeds to pull interest payments from. The reserve exists to bridge that gap.

It is not a discretionary perk. It's math. The reserve covers only interest — property taxes, builder's risk insurance, permit and inspection fees, and soft costs are separate line items the borrower funds independently. If your client thinks the reserve is a general contingency fund, correct that before it becomes a mid-build surprise.

The Part Most Lenders Don't Say Out Loud

Here's where the industry splits, and where you need to know exactly how your lender structures it. Some construction lenders build the interest reserve into the loan structure, included in the loan-to-cost calculation alongside other project costs, so it consumes a portion of available leverage. On paper, the headline leverage number looks generous. In practice, borrowers who exclude the reserve from their LTC model find the actual day-one advance is lower than expected, so pre-application modeling should include the full reserve as a cost line item.

That's a real cost to your client, even if nobody calls it one. If the reserve rides inside the cap, every dollar financed for interest is a dollar not available for lumber, labor, or permits.

Funded Capital structures it the other way. The reserve is a further 5% of cost financed on top of the leverage cap, not carved out of it. Standard leverage is 85% of full cost — purchase, sunk costs, and the remaining budget. Builders with 20 or more completed ground-up builds (Tier 5) qualify for 90% of full cost. Either tier can add the 5% reserve on top, which is how a Tier 5 builder reaches 95% all-in. The reserve band finances the interest reserve only — it never buys construction dollars, and it never eats into the 85% or 90%.

That distinction is the entire pitch when you're comparing term sheets for a client. A lower advertised rate on a reserve that's baked into the cap can cost more real construction leverage than a Funded Capital quote that looks less flashy on paper.

Leverage at a Glance

Full cost means purchase price, sunk costs, and the remaining construction budget. After-repair loan-to-value is a second, separate cap — the lender sizes to whichever of the two numbers is lower, regardless of tier. If the ARV cap is tighter than the cost-based number, the ARV cap governs, period. See our breakdown on LTV vs. LTC for how the two caps interact on any deal, not just construction.

When Financing the Reserve Helps Your Client

Financing the reserve makes sense when your client's cash is better deployed elsewhere. A builder juggling three active sites doesn't want liquidity locked up paying monthly interest on one of them when that cash could cover a down payment on the next acquisition. Financing the reserve frees that capital.

It also helps first-time or Tier-standard borrowers whose personal cash reserves are thinner relative to project size. A 12 to 24 month build with no income until certificate of occupancy is a long runway to self-fund interest out of pocket. Rolling it into the loan smooths that runway without touching the client's bank account.

And it helps on timeline-sensitive deals. Schedule risk creates pressure because interest costs continue while the project remains unfinished. A financed reserve means a permit delay or a weather slip doesn't turn into a cash call the client has to scramble to cover.

When It Costs Them

Financing the reserve isn't free. It's still borrowed money, and it still accrues interest on itself over the term. A builder sitting on strong liquidity who can comfortably carry monthly interest payments out of pocket is often better off declining the financed reserve and keeping the loan balance — and the interest that accrues on it — smaller.

It also costs your client when the deal is priced close to the ARV cap. Adding reserve dollars to the loan balance pushes the total loan amount up. If that pushes the deal against the after-repair LTV ceiling, the client gains nothing — the ARV cap governs regardless, and now they're carrying reserve debt they didn't need. Run the ARV math first with our ARV calculator guide before deciding.

Finally, it costs experienced builders who don't need it. A Tier 5 builder with a track record of on-time completions and strong cash reserves may not need the extra 5% at all. Every point of leverage carries a cost; a builder who can self-fund interest keeps that cost off the loan entirely.

Talking Points for Brokers

When you're structuring the conversation with a builder client, walk them through three questions:

1. How liquid is the builder relative to project size? Thin reserves favor financing the interest reserve. Strong reserves favor declining it.
2. Where does the loan land relative to the ARV cap? If the cost-based leverage number is already close to or above the ARV number, adding reserve dollars doesn't help — the lower cap wins either way.
3. How many completed ground-up projects does the builder have? Twenty or more moves them from 85% to 90% of full cost before the reserve conversation even starts.

Credit matters here too. Our ground-up program needs a 680 score, or 660 for builders with five or more completed builds. Pair that with builder tier and you have the full picture before you quote anything.

For the underwriting side of these deals, our new construction loan requirements post covers documentation, and rehab draw schedule covers how funds actually move once the reserve conversation is settled. If you're new to placing these deals, how to become a hard money broker is a good starting point on the mechanics of the relationship.

Rates and Terms, in Plain Numbers

Ground-up construction pricing at Funded Capital starts from 8.75%, stated as a range and never a guarantee. Terms run 12 to 24 months. Coverage spans 45 states, excluding Vermont, Utah, Oregon, South Dakota, and North Dakota. Closings typically run 5-10 business days, deal-dependent. Terms are subject to underwriting, appraisal, title, and insurance.

Bring Us the Deal Before You Quote It

The reserve conversation only matters if the leverage math underneath it is right. Run the numbers on our construction loan calculator, compare structures on the new construction loans program page, or get a term sheet started at /apply. Questions on a specific deal? Call (305) 857-5620.