Editorial
Kit vs Substack Fees at Scale
Fee comparison at 1K, 10K, 50K subscribers.
SiteBartar Research · Updated June 2026
Fee mechanics
Substack: ~10% platform fee on paid subscription gross plus payment processing (~2.9% + $0.30 per transaction typical Stripe). Free newsletters: $0 platform fee.
Kit: monthly SaaS by subscriber count — Creator free tier up to 10K subscribers common; Creator Pro adds features at higher tiers. No percentage of paid revenue on standard plans.
Beehiiv: SaaS tiers by list size — separate from Substack rev share model; see beehiiv-convertkit-substack-2026.
Hidden costs: custom domains, paid team seats, integration tools — include in TCO.
Scenario: 1K subscribers
Assume 5% paid conversion = 50 paid at $8/month = $400/month gross paid revenue.
Substack platform fee ~$40/month at 10% plus Stripe — total platform drag ~10%+ processing.
Kit on free Creator tier: $0 platform if under subscriber cap — only processing on paid if using Kit payments.
At low paid revenue, Substack simplicity may still win if you value network — fee difference is modest in dollars.
Get your personalized match
Paid, sponsors, or hybrid model fit.
Take the Newsletter Monetization Quiz quiz (~2 min)Scenario: 10K subscribers
Assume 5% paid = 500 paid at $10/month = $5,000/month gross.
Substack 10% ≈ $500/month platform fee before Stripe.
Kit Creator Pro or Beehiiv Scale tier might cost $79–$99/month range — verify live — saving hundreds vs Substack rev share at this revenue.
substack-10-percent-when-worth-it explores break-even psychology, not just math.
Scenario: 50K subscribers
Assume 4% paid = 2,000 paid at $10/month = $20,000/month gross.
Substack 10% ≈ $2,000/month platform fee.
Kit and Beehiiv enterprise tiers still often under $300–$500/month SaaS — verify — making rev share expensive at scale.
Migration cost amortized over 12 months usually favors switch if paid revenue stable.
Decision framework
Free-only newsletter: Substack $0 vs Beehiiv free tier — compare growth features not fees.
Paid revenue under ~$1K/month: Substack frictionless setup may outweigh fee delta.
Paid revenue over ~$2K/month: model SaaS vs 10% explicitly — newsletter-monetization-zero-fee.
Run newsletter-monetization-quiz with monetization beliefs.
Tools mentioned
Get your personalized match
Paid, sponsors, or hybrid model fit.
Take the Newsletter Monetization Quiz quiz (~2 min)Frequently asked questions
When does Substack 10% hurt?
When paid gross exceeds roughly $1.5K–2K/month — varies by SaaS tier — percentage exceeds fixed SaaS cost.
Is Kit free at 10K subs?
Creator free tier commonly covers 10K — verify kit.com pricing live.
Beehiiv vs Substack at scale?
Beehiiv SaaS usually beats 10% rev share at high paid revenue — compare tiers.
Do fees include Stripe?
Both models pay processing — Substack adds platform % on top.
Annual billing savings?
Kit and Beehiiv offer annual discounts — factor into break-even.
Switch cost?
Paid subscriber migration planning — one-time cost amortized over months.
Sources
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