Capital Stack

How Capital Stack Works in Business Lending

The capital stack organizes every funding source a business uses into a clear priority order for repayment in the event of default or liquidation. At the top sits senior secured debt — typically a bank term loan or SBA-guaranteed loan — which carries the lowest risk and therefore the lowest interest rate, often ranging from 6.5% to 10.5% for qualified borrowers. Below that sits subordinated or mezzanine debt, which is repaid only after senior lenders are made whole; this layer typically carries rates between 12% and 20% to compensate for added risk. Junior debt and preferred equity occupy the middle layers, while common equity sits at the very bottom, meaning equity holders are last to recover capital. Lenders scrutinize the entire capital stack — not just their own position — to calculate loan-to-value ratios, debt service coverage ratios (DSCR), and total leverage. The Federal Reserve’s 2023 Small Business Credit Survey found that businesses with clearly documented, well-structured capital stacks were approved for financing at significantly higher rates than those presenting single-source or opaque funding arrangements.

The capital stack requirements and tolerances differ sharply across lender types. SBA 7(a) lenders typically require that SBA-guaranteed debt occupy the senior position and limit total debt in the stack to maintain a minimum DSCR of 1.25x. Traditional community banks and credit unions are conservative, often refusing to lend into a deal where mezzanine or subordinated debt already exists without explicit intercreditor agreements. CDFIs (Community Development Financial Institutions) are more flexible by design — they frequently occupy subordinated positions in the stack specifically to support deals that senior lenders alone cannot fully fund, making them valuable partners for underserved borrowers. Online and alternative lenders, by contrast, often move quickly regardless of stack complexity but price their risk accordingly, sometimes charging APRs above 30% when they occupy a junior debt position. SBA 504 loans are a prime example of an intentionally structured two-layer capital stack: a senior bank loan covering roughly 50% of project costs, a CDC/SBA debenture covering 40%, and borrower equity covering the remaining 10%.

What Business Owners Should Do About Capital Stack

Before approaching any lender for significant financing, map out your existing capital stack in writing. List every current debt obligation — lines of credit, equipment loans, merchant cash advances, investor notes — along with each creditor’s lien position and outstanding balance. Calculate your current total debt relative to business assets and annual net operating income. If your DSCR falls below 1.25x after stacking all obligations, address that gap before applying by either paying down existing debt or increasing documented revenue. Gather intercreditor agreements if multiple lenders are already involved, as new senior lenders will require these. Timing matters: if you plan to add a mezzanine or equity layer, do so before approaching an SBA lender, since adding subordinated debt after closing can trigger covenant violations. Working with an accountant or financial advisor to formally model your capital stack — showing projected debt service on each layer — dramatically improves your credibility with underwriters and can shorten approval timelines by weeks.

Understanding where a new loan fits within your capital stack is one of the most important — and most overlooked — steps in the borrowing process. We connect you with lenders — we do not lend — which means our role is to match your specific capital stack profile with the lender type best positioned to fill the gap you need, whether that is a senior SBA lender, a CDFI willing to take a subordinated position, or a community bank comfortable with your existing debt structure. This matching approach saves time and protects your credit from unnecessary hard inquiries.