Interest Reserve
Updated 8 August 2025

What is an Interest Reserve?
An interest reserve is a portion of a loan set aside to cover interest payments during the development phase. It’s meant to help borrowers manage cash flow in projects where revenue may be delayed.
This reserve is calculated based on the loan amount, interest rate, and expected duration of the construction or lease-up period. By incorporating an interest reserve, lenders enable borrowers to defer interest payments until the property begins generating income.
How Do Interest Reserves Work?
The mechanics of interest reserves are straightforward:
- The lender holds back a portion of the loan proceeds in a separate account, known as an interest reserve account.
- Each month, the lender allocates funds from this account to cover the loan’s interest expense.
- This process continues until the project begins generating cash flow.
For example, in a $1 million, 12-month bridge loan at 11% interest with monthly payments of $9,166.67, the lender would set aside $110,000 at closing to cover the interest payments.
Benefits of Using Interest Reserves
Interest reserves offer several advantages in commercial real estate financing:
- Cash Flow Management: They enable borrowers to manage cash flow during the construction and lease-up phase when the property is not yet generating revenue.
- Project Focus: By alleviating the immediate pressure of interest payments, developers can concentrate on timely project delivery and tenant acquisition.
- Lender Security: Reserves provide additional security for lenders, ensuring interest payments even if the property is not generating income.
Key takeaway: Interest reserves can improve cash flow management and help you focus on project delivery, benefitting both borrowers and lenders in CRE projects.
Risks Associated with Interest Reserves
Despite their benefits, interest reserves come with potential risks:
- Depletion Risk: If a project experiences significant delays or cost overruns, the interest reserve may be exhausted before the property generates sufficient cash flow.
- Masking Problems: Poorly underwritten loans with excessive interest reserves can conceal underlying issues with a project, increasing risk for the lender.
- Monitoring Challenges: Lenders must carefully track construction progress and lease-up to ensure appropriate use of interest reserves.
Key takeaway: While interest reserves offer flexibility, you need to monitor them closely to avoid depletion and ensure project issues aren’t hidden.
Accounting Treatment for Interest Reserves
The accounting treatment of interest reserves is critical for accurate financial reporting:
- Under Generally Accepted Accounting Principles (GAAP), interest reserves are typically treated as a contra-asset account limiting the outstanding balance recorded on financial statements.
- As interest is paid from the reserve, the contra-asset account decreases, and the lender recognizes interest income.
- This treatment ensures that financial statements accurately reflect the loan's economics and the borrower's financial position.
Key takeaway: Correctly accounting for interest reserves ensures that your financial statements reflect real loan and income positions.
Best Practices for Managing Interest Reserves
To effectively manage interest reserves, consider the following best practices:
- Establish clear policies for calculating reserve amounts and monitoring project progress.
- Structure reserves based on realistic project timelines and budgets, including contingencies for potential delays or cost overruns.
- Regularly review project status and be prepared to take action if a project encounters difficulties.
- Utilize property management software features for raising invoices for future rent to help manage these reserves effectively.
Red Flags for Interest Reserve Misuse
Watch for these warning signs of potential interest reserve misuse:
- Projects significantly behind schedule or over budget without a clear recovery plan.
- Premature depletion of interest reserves with no additional capital from the borrower for future interest payments.
- Completed properties with stalled lease-up or sales, indicating possible market misalignment with proposed rents or prices.
Key takeaway: Watch for early warning signs of misuse so you can address issues before they impact project success or financing.
By understanding and properly managing interest reserves, commercial real estate professionals can enhance project success and mitigate financial risks associated with development and construction loans.
Summary
The interest reserve is a valuable tool for managing development-phase loan payments, but it also carries risks if not monitored closely. Keeping track of reserve drawdowns and adhering to sound lending practices are vital for successful outcomes.
About the Author
Dulan Perera
Director, Demand Gen
Dulan combines strategic marketing expertise with deep knowledge of commercial real estate (CRE) to drive meaningful growth across the industry. His focus is on connecting property professionals with insights that matter, spanning compliance, financial operations, property management, stakeholder relationships, and the evolving role of technology and AI. His goal: help real estate businesses scale smarter in a digital-first world.