Choosing between a SAFE, convertible note, and priced equity round affects dilution, investor protections, legal cost, and the timing of ownership decisions. This guide compares the three instruments, shows how to model conversion outcomes with repeatable assumptions, and provides a checklist for selecting and revisiting a financing structure.
Overview
These instruments solve a similar problem: raising capital before, or at the beginning of, a company’s next major financing milestone. They do so with different levels of pricing certainty and legal complexity.
- SAFE: An agreement for a future equity interest. The investor generally does not receive shares immediately and typically receives no interest or maturity date. Conversion is usually triggered by a qualifying equity financing, sale, or other event described in the document.
- Convertible note: Debt that is intended to convert into equity later. It commonly includes a principal amount, interest rate, maturity date, valuation cap, and sometimes a discount to the next financing price.
- Priced equity round: The company and investors agree on a valuation and share price at closing. Investors receive shares immediately, along with negotiated rights and preferences.
The right choice depends less on a universal ranking than on the company’s stage, fundraising objective, investor requirements, expected timing of the next round, and willingness to negotiate governance and ownership now. A simple instrument can still create complex dilution if the cap table is not modeled carefully.
| Feature | SAFE | Convertible note | Priced round |
|---|---|---|---|
| Valuation cap | Common, but not mandatory | Common, but not mandatory | Replaced by an agreed valuation and share price |
| Discount | May apply to a later financing price | May apply to a later financing price | Usually reflected in the negotiated price and terms |
| Interest | Generally none | Usually specified and accrues under the note | Not a feature of the equity shares |
| Maturity date | Generally none | Usually included | Not applicable to equity shares |
| Investor rights | Often limited until conversion, subject to the document | Debt and conversion rights apply; details vary | Can include voting, information, pro rata, protective, and liquidation rights |
| Dilution timing | Usually determined at a later trigger event | Usually determined at conversion or another note event | Determined when shares are issued |
| Legal complexity | Often lower than a priced round when standard forms are used | Moderate; debt terms and securities terms must be addressed | Highest of the three in many early-stage financings |
| Typical fit | Fast early fundraising with limited negotiation | Bridge financing or situations where debt mechanics are acceptable | Material financing requiring a clear valuation and governance framework |
This table is a planning summary, not a substitute for reviewing the actual instrument. SAFEs and notes can differ materially by form, jurisdiction, and negotiated amendments.
How to estimate the cost and conversion outcome
Start with a fully diluted capitalization table. Include founders, existing preferred and common shares, issued options, the option pool, and all outstanding SAFEs and notes. Then run at least three financing scenarios: a lower future valuation, a base case, and a higher future valuation.
SAFE estimation
For a capped SAFE, compare the valuation-cap price with the price available under any discount. The investor generally converts using the more favorable applicable method under the agreement. A simplified cap-based estimate is:
Estimated conversion price per share = valuation cap divided by the relevant capitalization measure.
The exact capitalization definition matters. A post-money SAFE, for example, is designed to make the ownership sold through the SAFE easier to estimate before the next round, while a pre-money structure can produce a different result as additional securities are issued. Confirm which shares and instruments are included in the document’s definition.
Convertible note estimation
First calculate the amount that converts:
Conversion amount = principal + accrued interest.
Next compare the price produced by the valuation cap with the discounted financing price. The note converts according to the applicable term, which may use the lower price or otherwise specify a favorable conversion method. A maturity date also creates a decision point if the next equity financing has not occurred. The note may be extended, repaid, amended, or handled through another contractual outcome, depending on its terms and applicable law.
Priced-round estimation
A priced round begins with the negotiated pre-money valuation:
Price per share = pre-money valuation divided by the agreed pre-money capitalization.
The investor’s ownership immediately after closing can then be estimated as:
New investor ownership = investment divided by post-money valuation.
This simplified formula should be reconciled to the actual capitalization definition, option-pool treatment, warrants, and other securities in the term sheet. A proposed option-pool increase immediately before closing can shift dilution toward existing holders, so model it explicitly rather than treating it as a footnote.
Inputs and assumptions
Use one worksheet for assumptions and a separate cap-table output so that every change can be traced. Record the following inputs:
- Amount raised: Separate each SAFE or note by investor, date, and amount.
- Cap terms: Enter the valuation cap and identify whether it is pre-money or post-money.
- Discount terms: Record the discount percentage and the financing event to which it applies.
- Note economics: Enter interest rate, compounding method, issue date, maturity date, and any qualified-financing threshold.
- Future round assumptions: Model the expected pre-money valuation, new investment, share price, and option-pool changes.
- Rights and preferences: List pro rata rights, information rights, liquidation preferences, voting provisions, protective provisions, and any side letters.
- Transaction costs: Budget legal, filing, accounting, diligence, and administrative costs. Actual costs vary with complexity and jurisdiction.
Do not compare instruments only by headline valuation cap. A lower cap may produce more investor ownership, while a discount, accrued interest, or expanded option pool can change the result further. Also compare the non-price terms: control rights, future participation rights, information obligations, and what happens if the expected financing is delayed.
For a broader view of ownership mechanics, see the Startup Cap Table Basics guide and the Startup Cap Table Modeling guide. For valuation assumptions, the Series A Valuation Guide provides a useful companion framework.
Worked examples
Example 1: SAFE with a valuation cap
Assume an investor contributes $250,000 through a SAFE with a $5 million post-money cap. As a rough planning estimate, the implied ownership before considering other SAFEs, the new financing, and document-specific definitions is:
$250,000 ÷ $5,000,000 = 5%.
If the company later raises additional capped SAFEs, the aggregate SAFE ownership can exceed the amount initially expected by a founder who modeled only one instrument. If the next round includes an option-pool increase, that change can also affect existing holders. Use the actual post-money calculation in the governing document for the final result.
Example 2: Convertible note with interest and a discount
Assume a $200,000 note carries 8% simple annual interest and converts after 18 months. Accrued interest would be:
$200,000 × 8% × 1.5 = $24,000.
The conversion amount is therefore $224,000. If the next round’s share price is $2.00 and the note has a 20% discount, the discounted price is $1.60. If the valuation cap produces a price of $1.40, the cap is more favorable to the investor in this simplified comparison. The note would convert using the applicable contractual method, potentially giving the investor $224,000 divided by $1.40, or approximately 160,000 shares before reconciling the capitalization definitions.
Example 3: Priced equity round
Assume a company agrees to a $4 million pre-money valuation and raises $1 million in new equity. Ignoring option-pool adjustments and other securities for illustration, the post-money valuation is $5 million and the new investor owns approximately:
$1,000,000 ÷ $5,000,000 = 20%.
The company and investor can address governance and information rights immediately, rather than waiting for a conversion event. The trade-off is a more involved negotiation and a current valuation that may be difficult to agree on when the company has limited operating history.
When to recalculate
Revisit the model before signing any new instrument and whenever a key assumption changes. At minimum, recalculate when:
- the amount raised or investor allocation changes;
- a new SAFE, note, warrant, or option-pool commitment is added;
- the expected next-round valuation or financing size changes;
- a note approaches maturity or its interest has accrued materially;
- an investor requests a discount, cap, pro rata right, or side letter;
- the company considers a bridge round, acquisition, or other liquidity event; or
- standard financing forms, tax treatment, securities rules, or market conventions change.
Before selecting an instrument, complete this checklist:
- Prepare a fully diluted cap table and identify every outstanding security.
- Ask whether the next financing is likely soon enough to support a conversion instrument.
- Model low, base, and high future valuation cases.
- Compare dilution under both the cap and discount mechanisms.
- Review maturity, repayment, conversion, and exit provisions for any note.
- List investor rights and future obligations alongside the financial outcome.
- Have qualified legal and tax advisers review the documents and assumptions.
A SAFE may suit a straightforward early raise, a convertible note may fit a bridge where debt mechanics are understood, and a priced round may be appropriate when valuation, governance, and investor rights need to be settled now. The most defensible choice is the one whose ownership and obligations remain understandable under several realistic scenarios.
