A 20 percent technical co-founder grant can be worth roughly $2M to $5M at an 18-month Series A. The same period bought with a fractional CTO or subscription dev team runs about $144K to $270K or $180K to $240K in cash.
Equity is the most expensive capital a founder issues. Use it when the technical partner is the reason the company exists, not when the real need is senior product shipping capacity.
Below the surface
I have watched a dozen founders do the math wrong on this one. The reflex is "I need a technical co-founder." The default ask is 20 percent equity at idea stage. The spreadsheet rarely gets opened before the term sheet gets signed.
At a $60M post-money Series A, a 20 percent pre-A grant that dilutes to 16 percent is worth $9.6M on paper. Even using the more conservative Series A range in the draft, that same grant represents roughly $2M to $5M of founder value for an 18-month build.
By the numbers
The equity math that changes the answer
Default ask
20%
Common idea-stage technical co-founder equity grant.
Series A value
$2M-$5M
Approximate 18-month value of the equity path in the draft's conservative Series A range.
Fractional CTO
$144K-$270K
Cash cost for a real working fractional CTO engagement over 18 months.
Dev team
$180K-$240K
Cash cost for a subscription dev team across the same 18-month window.
03 / What cash buys
The same 18 months bought in cash
The real comparison is not equity versus nothing. It is equity versus the cash options that buy senior judgment and shipping output without transferring ownership.
Technical co-founder
A 20 percent grant can cost $2M to $5M in Series A terms, even when the cash outlay during the build is low.
Fractional CTO
$8K to $15K monthly buys architecture, technical leadership, build-vs-buy decisions, hiring support, and fundraising support.
Subscription dev team
$10K to $13K monthly buys a product-ownership-level pod that ships features without equity or hiring overhead.
Where the "I cannot afford cash" argument breaks
If the only reason to choose a co-founder is that cash feels scarce, price the future equity before you call it cheap.
- 01
A pre-seed can be cheaper
A $750K pre-seed at a $4M pre-money valuation is roughly 16 percent dilution, and it can fund the 18 months without giving a single builder 20 percent.
- 02
Equity is de-risking capital
When a founder has only a slide, the technical co-founder is being asked to de-risk the idea. The market price for that risk is high.
- 03
No runway is a constraint
If you literally cannot pay anyone, equity may be the only option. That does not make it inexpensive.
- 04
Alignment still needs structure
Even when equity is right, use a 4-year vest and 1-year cliff so the cap table reflects durable contribution.
05 / Equity path
When the equity path is still the right call
Equity is not wrong. It is just too expensive to use for ordinary execution work.
06 / Hybrid path
The hybrid path working in 2026
Most founders are not trying to recruit irreplaceable technical insight. They need someone to ship the MVP and keep the architecture sane.
- 01
Fractional CTO for strategy
$5K to $10K per month buys 8 to 15 hours of senior technical leadership. Use it for architecture, build-vs-buy calls, early hiring, and fundraising support.
- 02
Subscription dev team for production
$10K to $15K per month buys a 2-to-3 person pod that ships features. The founder keeps equity, gets parallel throughput, and can terminate with a clear handoff.
- 03
The 18-month range is still lower
$270K to $450K is expensive relative to bootstrap. It is still a fraction of a 20 percent equity grant priced at Series A.
- 04
Transition after the raise
Post-Series A, a full-time CTO becomes cheaper. That is when 0.5 to 2 percent plus salary can replace the fractional-to-pod setup.
FAQ
How much equity should I give a technical co-founder?
If they are the reason the company exists, 30 to 50 percent can be appropriate. If they are a builder you met on an engineering Slack, 10 to 20 percent with a 4-year vest and 1-year cliff is more honest. If the work can be bought with cash, the answer is often zero.
What is a fractional CTO actually worth per month?
$8K to $15K for a real working engagement at 30 to 60 engaged hours, or $5K to $8K for pure advisory work at 10 to 20 hours.
Can a subscription dev team replace a technical co-founder?
Most of the output, yes. The psychological partnership, no. Price that relationship honestly instead of pretending equity is only paying for code.
How do I know if equity is still right?
Ask whether this person could be replaced at any cash rate. If yes, it is probably execution work. If no because they carry irreplaceable domain insight, equity is the right tool.
What if I already gave away too much equity?
Structure a reasonable vesting schedule if one does not exist, then have a lawyer-mediated conversation about exit terms if the co-founder is not carrying their weight. Do not try to claw back vested equity without counsel.