SAFEs and Convertible Notes: What Founders Should Track
A plain-English founder guide to tracking SAFEs and convertible notes: caps, discounts, MFN, pro rata, conversion maths and the register you need before…
SAFEs and convertible notes are efficient ways to take money before a priced round. They are also how founders accidentally give away more of the company than the pitch deck implied, usually because nobody maintained a living register of caps, discounts, valuation collars and side letters. This guide is the virtual CFO view: what to track, how conversion maths works in plain terms, and what to prepare before a Series A model touches the cap table.
Published: July 2026
SAFE (Simple Agreement for Future Equity), typically no interest and no maturity date (depending on version). Converts into equity on a qualifying priced round (and sometimes on liquidity or dissolution events) at a valuation cap and/or discount.
Convertible note, debt that converts, usually with interest and a maturity date. If a priced round does not happen in time, you have a repayment or renegotiation problem as well as a dilution problem.
For tracking purposes, treat both as claims on future equity with parameters that must live in one register. Do not keep terms only in email PDFs.
This is commercial tracking guidance, not legal advice. Instrument versions differ; your lawyer owns enforceability.
Field: Investor legal name Why it matters: Cap table and side letter matching.
Field: Instrument type Why it matters: SAFE / note / other.
Field: Document date and version Why it matters: YC post-money SAFE vs older forms behave differently.
Field: Principal invested Why it matters: Cash in.
Field: Valuation cap Why it matters: Conversion price ceiling logic.
Field: Discount Why it matters: Conversion price reduction if no cap or dual-parameter.
Field: MFN (most favoured nation) Why it matters: Later better terms can flow back.
Field: Pro rata rights Why it matters: Affects round dynamics and allocation.
Field: Interest rate and accrual (notes) Why it matters: Increases converting principal.
Field: Maturity date (notes) Why it matters: Hard deadline risk.
Field: Conversion triggers Why it matters: What events convert.
Field: Side letters Why it matters: Governance, information rights, special terms.
Field: Long-stop / amendment history Why it matters: Avoids stale terms in the model.
Update the register the day money hits the account, not the week before the raise.
On post-money SAFEs, the SAFE ownership percentage is generally easier to read as a function of amount invested divided by post-money cap, subject to the exact document. That makes dilution from the SAFE layer more transparent before the priced round, and it means stacking multiple post-money SAFEs can dilute founders more than an informal “we only raised a bit” story suggests.
On older or pre-money formulations, interactions with the option pool and round structure can be less intuitive. The operational rule: do not guess. Put each instrument’s mechanics into the conversion waterfall with counsel’s confirmation before you publish a cap table to new investors.
When a priced round happens, SAFE/note holders typically convert at the lower of (depending on terms):
Worked illustration (simplified teaching example, not a substitute for legal forms):
Discounted price = $1.20 × 0.80 = $0.96
Cap-implied price depends on the share count methodology in the documents; conceptually the cap is meant to give a better price than $1.20 if the company is worth more than the cap at conversion. The SAFE converts at the more favourable price per the agreement, issuing a number of shares equal to principal divided by that price (mechanics vary by form).
If you cannot reproduce conversion shares within a small rounding difference, your cap table is not raise-ready.
Convertible notes often accrue interest that converts as additional principal. A $1,000,000 note at 8% simple interest outstanding for 18 months is not a $1,000,000 claim; it is about $1,120,000 before conversion (illustrative simple interest). Track accrual monthly in the register so the model does not understate dilution.
MFN can mean a later SAFE with a lower cap improves earlier investors’ terms. If you issue a desperate bridge on a low cap, you may rewrite earlier deals automatically. Log every new instrument against MFN flags the same day.
Pro rata rights affect how much room exists for new investors and how “full” a round feels. They belong in the round model, not as a surprise in legal mark-ups.
Side letters are where information rights, vetoes and special consents hide. Your data room should file them next to the main instrument.
A fundraise-ready model should include a conversion waterfall tab:
Founders who only model “new investor takes 20%” without converting the stack are modelling fiction.
A company raises $1.5M on post-money SAFEs at a $10M cap across several closes, then raises a Series A at a $25M pre-money with a 10% option pool top-up and converting SAFEs. The founder’s mental model was “investors own a bit until A.” The actual model shows founders materially lower once SAFEs convert and the pool is refreshed. None of this is malicious. It is arithmetic that was not kept live. Live arithmetic is the whole job of tracking.
Do I need a CFO to track SAFEs?
You need a system. A virtual CFO or strong finance lead builds the register, waterfall and board reporting. Lawyers draft and confirm legal effect. Both matter.
Is a SAFE debt?
Typically no; it is a convertible equity instrument under common SAFE forms. Notes are debt until conversion. Accounting and tax treatment depend on facts; use your accountant for accounting, not a blog post.
What is the biggest tracking failure?
Multiple instruments with different caps and side letters living only in email, plus a pitch deck cap table that ignores them.
When should conversion be remodelled?
At every new instrument, every proposed term sheet, and whenever you change option pool assumptions.
How does this link to Series A metrics?
Investors will diligence ownership and incentive pool as hard as ARR and NRR. A messy convertible stack slows diligence and weakens trust.
Can this be part of a 90-Day Number?
Yes. A common deliverable is a fundraise-ready model including the conversion waterfall and a clean instrument register summary for the data room. Fixed scope 90-Day Number at $17,850 plus GST for one named deliverable.
Sydney Virtual CFO is a Sydney-based virtual CFO service for founders running $2M to $15M businesses across SaaS, ecommerce, professional services, construction, and other low-volume, high-value industries. We deliver fixed-scope CFO engagements with a named deliverable on day 90: a 13-week cashflow forecast, a fundraise-ready financial model, a unit economics build, or a board reporting pack you can run on your own.
Our front-door product, the 90-Day Number, is fixed scope at $17,850 plus GST. We are one of the few project-based virtual CFOs in Australia, in a market built almost entirely on monthly retainers. No retainers without a deliverable. No 80-page reports. No theatre.
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This content is general information only, written for Australian founders running businesses in the $2M to $15M revenue range. It does not constitute tax, financial product, investment, or legal advice and should not be relied on as such. The work referenced is led by a Chartered Accountant (CA ANZ), but Sydney Virtual CFO is not a licensed tax agent, not a licensed financial adviser, and not authorised to provide personal financial advice. Tax obligations, accounting treatments, fundraise terms, and statutory requirements depend on your individual circumstances. For advice specific to your business, contact the team directly or consult a registered tax agent, licensed financial adviser, or qualified lawyer. Information was current at the time of publication and may change without notice. We review and update guides periodically.
