DebtStackA Founder’s Guide to Debt Capital
Part 1 of 11 · Foundations

Debt is your COGS

A software company buys servers. A restaurant buys ingredients. You buy money — and the terms you rent it on determine your unit economics more than almost anything else you do.

The short version

For a lending business, debt capital isn't financing — it's your cost of goods sold. Debt investors are fixed-income buyers: their best case is the coupon, so they buy track record, protect the downside, answer to committees, and monitor everything. Internalize their mindset and every "excessive" ask starts making sense. And diligence them as hard as they diligence you.

If you're building a lending business, debt capital isn't financing. It's your cost of goods sold. A software company buys servers. A restaurant buys ingredients. You buy money. The price you pay for it, the terms you rent it on, and the covenants wrapped around it determine your unit economics more than almost anything else you do. Your credit model decides whether you make money on a loan. Your debt stack decides whether there's any margin left after you do.

Equity is for building the machine. Debt is what the machine runs on. Run the arithmetic once and you'll never unsee it:

The lever — illustrative
Product yield
24%
Losses
6%
Cost of capital
14%
=
Your margin
4 pts
Get capital from 14% to 10% and your margin is 8 pts — doubled — without touching product, credit, or growth. Nothing else in the business has that lever length.

That's why the founders who get good at this treat capital markets as a first-class function — same tier as credit and growth. Because for a lending business, that's what it is.

And yet almost every founder shows up to their first debt conversation running an equity playbook. It fails. Not because the pitch is bad — because it's the wrong pitch for the audience. So before any tactics, internalize the mindset on the other side of the table. It explains everything else in this guide.

How debt investors think

Debt is a fixed-income asset. The best case is the coupon. An equity investor can make 100x on you. A debt investor's maximum outcome, if everything goes perfectly, is their interest rate — call it 10–15%. Limited upside, full downside. Imagine underwriting startup risk with your win capped at a coupon. You'd be paranoid too. That asymmetry drives everything:

Mindset

They buy the past, not the future

Equity investors buy vision. Debt investors buy performance data. Your grand-vision pitch — the one that works on VCs — actively doesn't work here. Familiarity beats ambition. The most soothing thing you can be, to a debt investor, is legible: a product they've seen before, performing the way products like it perform, run by people who've done it before.

Mindset

They protect the downside, always

Every ask that feels excessive — the reserves, the triggers, the audits, the backup servicer, the control over your bank accounts — is downside protection for someone whose upside can't pay for surprises. Get comfortable with the asks. They're not distrust; they're the asset class.

Process

They answer to a committee

Like VCs, debt investors write long memos, and every deal clears an investment committee whose only real question is "how do we lose money on this?" Your job is to make that memo easy to write. Every clean data table, every documented policy, every pre-answered risk question is a paragraph the deal lead doesn't have to defend in front of skeptics. Write for the committee, not the person in the room.

Process

They monitor like hawks

Equity investors mostly leave you alone between rounds. Debt investors want weekly or monthly portfolio reporting, annual (sometimes semiannual) diligence, audit rights, and often live read-only access to your accounts. This is the deal. Budget for it — in money and in ops time. Part 10 covers what this looks like day to day.

Mindset

They want predictability, not upside

Consistent monthly cash flows, deployment on a 12–24 month schedule, minimum monthly volume. Volatile performance = uncertainty, and uncertainty is the one thing fixed income cannot price in your favor. A debt investor would usually rather see you grow slower and smoother than faster and lumpier. "We deliberately throttle growth to protect credit quality" is a selling point in this room. Try that line on a VC :)

Process

They diligence your equity investors

Your equity cushion is their loss protection, so they care a lot about who's behind you and whether those people will fund again. Expect them to ask for the cap table early and to call your investors directly. A strong recent round is worth real basis points. More on timing below.

Pawn shop to stock market

A useful way to think about pricing: without data, a debt deal is priced like a pawn shop. With data, it starts getting priced like a stock market. The whole early game is moving yourself along that line. Here's what the line looks like, with illustrative numbers:

Same company · same product · two years of data apart
First facility — young book
  • Advance rate ~70% — they fund $70 of every $100; you fund the rest
  • Spread: double-digit over the benchmark
  • Heavy structural protections
  • Single-digit $M committed
Two years later — seasoned book
  • Advance rate pushing 90%
  • Spread: several hundred bps tighter
  • Lighter covenants
  • Lenders competing for the paper
Same company. Same product. The difference is entirely the data — and the performance behind it. Nothing about the progression is automatic; it's earned monthly, cohort by cohort. But it's the single most reliable compounding loop in a lending business:
Performance Cheaper capital Better unit economics Careful growth More performance ↺

Diligence them back

Founders forget this half of the table. You're entering a multi-year relationship with someone who will have control rights over your cash, veto power over parts of your product, and a seat in every future financing conversation. The fund matters as much as the sheet. Reference-check the lender the way they reference-check you:

Talk to their other borrowers

Not the ones they introduce you to — the ones you find yourself. Ask the only questions that matter: What happened when you missed a covenant? What happened when you needed an amendment? Did they fund the upsize when you earned it? A lender's behavior in your bad month is the product you're actually buying.

Track the people, not just the fund

Credit is a small world. The person leading your deal may have priced ten books like yours at their last shop; that experience shapes everything from how fast diligence moves to how sane your covenants are.

Discount the charm

Warmth and price are independent variables — a friendly cover letter can sit on top of the most expensive sheet in the stack. Read the numbers, not the adjectives.

Ask what they do at scale

Some lenders are perfect for your first $10M and structurally unable to fund your next $100M. That's fine — sometimes ideal — as long as you know it going in and haven't granted them rights over your next raise (Part 5 covers that trap).

Two logistics facts to plan around

A debt deal takes 3–12 months to close. Some of that is diligence, some is documentation, some is the committee calendar. If you need the money in Q4, you start in Q1. There's no growth-round-style sprint here.

Unlike equity, it's a continuous process. You can come back every few months as the data improves — and you should. Terms that were unavailable at $2M of originations are on the table at $10M. The market re-prices you every time your book seasons another quarter.

The best timing advice in this guide

Raise debt immediately after a large equity round. More equity means more cushion under the lender, which means more leverage for you and simpler terms. The equity round and the debt raise are one campaign, not two. Sequence them that way.

Debt investors aren't adversaries, and the good ones become something closer to partners: the supplier of your single biggest input cost, and a relationship that compounds across every facility you'll ever raise. Treat it with exactly that seriousness.

A facility is a multi-year relationship where both sides win the same way: the book performs, the reporting is clean, the upsizes get earned. Everything in this guide about negotiating carefully is in service of that — deals with clear numbers and no surprises are the ones that turn lenders into long-term partners.

Next: the instruments themselves — because "we're raising a debt facility" describes about six structurally different things, and you should know which one you're asking for.