Substack vs Beehiiv vs ConvertKit: Newsletter Revenue Compared | CalcFalcon

The newsletter platform you choose determines what percentage of every subscriber dollar reaches your bank account. That sounds obvious, but most creators pick a platform based on features or vibes and never run the math on what the fee structure costs them at scale. The difference between Substack’s 10% platform cut and Beehiiv’s 0% cut on a 500-subscriber paid newsletter is over $3,000 per year. Whether that difference justifies the tradeoffs depends on your audience size, revenue model, and willingness to manage your own growth tools.

This guide compares the three dominant newsletter platforms in 2026 — Substack, Beehiiv, and ConvertKit — with real fee calculations, sponsorship CPM modeling, and churn math that most platform comparison articles skip entirely. Run your specific numbers through our Substack calculator or newsletter revenue calculator as you read.

How Newsletter Platform Fees Actually Work

Every newsletter platform charges fees in up to three layers, and conflating them is how creators misjudge their true costs.

Layer 1: The Platform Fee

This is the percentage the platform takes from your paid subscription revenue. Substack charges 10%. ConvertKit charges 3.5%. Beehiiv charges 0% on their Scale plan (though that plan itself costs $99 per month). Some platforms frame this as a revenue share, others as a transaction fee. The effect is the same: a percentage of your gross subscriber revenue disappears before you see it.

Layer 2: Payment Processing

Every platform uses Stripe (or a similar processor) to handle credit card transactions. The standard rate is 2.9% plus $0.30 per transaction. This fee applies regardless of which platform you choose — it is a cost of accepting online payments, not a platform-specific charge. Some platforms bundle this into their advertised rate, others list it separately. Either way, you pay it.

Layer 3: The Subscription Cost

Beehiiv and ConvertKit charge monthly subscription fees for access to their platform, independent of how much revenue you generate. Substack charges no subscription fee — their 10% cut is the price of admission. This creates a fundamentally different cost structure: Substack’s fees scale linearly with your revenue, while Beehiiv’s fixed cost becomes proportionally cheaper as you grow.

Understanding which layer dominates your costs at your current scale is the key to choosing the right platform.

Substack: The 10% Revenue Share Model

Substack’s fee structure is the simplest of the three: 10% of your gross paid subscription revenue, plus Stripe’s 2.9% and $0.30 per transaction. No monthly subscription fee. No tiered pricing plans. You pay nothing until you earn something.

What the 10% Includes

Substack’s platform fee covers hosting, email delivery, a built-in reader network, podcast hosting, a mobile app presence, community features (Notes, Chat), and subscriber management. There are no feature gates — every Substack writer gets the same tools whether they have 100 subscribers or 100,000. The 10% also implicitly covers Substack’s recommendation engine, which surfaces your newsletter to readers of similar publications. For some writers, this network effect generates meaningful organic growth.

The Real Cost at Scale

On a $10 per month subscription with 200 paid subscribers, your gross monthly revenue is $2,000. Substack takes 10%, or $200. Stripe takes 2.9% of $2,000 ($58) plus $0.30 per transaction (200 x $0.30 = $60), totaling $118. Your combined fees are $318, leaving you with $1,682. Your effective fee rate is 15.9%.

At 1,000 paid subscribers on the same $10 per month, your gross is $10,000. Substack takes $1,000. Stripe takes $290 plus $300, totaling $590. Combined fees: $1,590. You keep $8,410. The effective rate drops slightly to 15.9% — it stays essentially flat because both the platform fee and the percentage-based processing fee scale linearly.

The $0.30 per-transaction fee becomes proportionally less painful at higher subscription prices but never disappears. At $5 per month, the $0.30 represents 6% of the transaction on its own. At $15 per month, it drops to 2%. This is the same dynamic that affects Patreon creators — flat per-transaction fees penalize low price points.

When Substack Makes Sense

Substack is the strongest choice when you are starting from zero and want to validate demand before committing to monthly platform costs. The zero-upfront-cost model means your only risk is time. It also makes sense if Substack’s recommendation network is relevant to your niche — writers in politics, culture, finance, and tech tend to benefit most from cross-pollination on the platform. If organic discovery matters to you, that 10% is partially buying distribution.

Annual Plan Considerations

If you offer annual subscriptions on Substack, the standard practice is a two-month discount — subscribers pay for 10 months but get 12. This reduces your effective monthly revenue per annual subscriber by about 17%, but it dramatically improves retention. An annual subscriber who has prepaid has near-zero churn for that year. On Substack, the 10% platform fee applies to the discounted annual amount, so you pay 10% on 10 months of revenue rather than 12. Stripe processes it as a single transaction, meaning you pay $0.30 once instead of 12 times — saving $3.30 per annual subscriber in flat processing fees.

Beehiiv: The Zero-Platform-Fee Play

Beehiiv has positioned itself as the anti-Substack by charging 0% on paid subscription revenue — on their Scale plan. The catch is that the Scale plan costs $99 per month ($1,188 per year), and the lower-tier plans either do not support paid subscriptions or take a cut.

Beehiiv’s Pricing Tiers

The Launch plan is free but does not support monetization. The Grow plan at $49 per month supports paid subscriptions but takes no platform fee — however, it caps some features. The Scale plan at $99 per month removes all caps, charges 0% on revenue, and adds advanced analytics, A/B testing, and API access. The Max plan at $399 per month adds dedicated support and custom integrations.

For most newsletter creators running paid subscriptions, Scale at $99 per month is the relevant comparison point against Substack.

The Real Cost at Scale

Same scenario: $10 per month subscription, 200 paid subscribers. Gross monthly revenue: $2,000. Beehiiv platform fee: $0. Beehiiv subscription cost: $99. Stripe takes 2.9% of $2,000 ($58) plus 200 x $0.30 ($60), totaling $118. Combined costs: $217. You keep $1,783. Your effective cost rate is 10.85%.

Compare that to Substack’s $318 in fees on the same revenue. Beehiiv saves you $101 per month, or $1,212 per year.

At 1,000 paid subscribers ($10,000 gross), Beehiiv costs $99 plus $590 in Stripe fees, totaling $689. Substack costs $1,590. The gap widens to $901 per month — over $10,800 per year. This is where Beehiiv’s model becomes compelling. The fixed $99 becomes a rounding error on $10,000 in monthly revenue, while Substack’s 10% scales relentlessly.

The Breakeven Calculation

At what revenue level does Beehiiv’s $99 per month become cheaper than Substack’s 10% cut? The math is straightforward. You are comparing $99 per month (Beehiiv) against 10% of gross revenue (Substack). The breakeven point is where 10% of gross equals $99 — which is $990 per month in gross revenue.

Below $990 per month in paid subscription revenue (roughly 99 subscribers at $10 per month), Substack is cheaper because you pay less than $99 in platform fees. Above $990, Beehiiv saves you money every month, and the savings compound as you grow.

If you are earning $500 per month, Substack costs $50 in platform fees while Beehiiv costs $99. Substack wins by $49 per month. If you are earning $2,000 per month, Substack costs $200 while Beehiiv costs $99. Beehiiv wins by $101 per month.

What You Give Up

Beehiiv does not have Substack’s built-in reader network. There is no equivalent of Substack Notes, no recommendation engine that surfaces your newsletter to readers of similar publications. If you are on Beehiiv, your growth is entirely your responsibility — through your own content marketing, social media, SEO, or paid acquisition. For creators who already have an audience or strong growth channels, this is fine. For creators starting from scratch, the absence of organic discovery is a real disadvantage.

ConvertKit: The Creator-Focused Middle Ground

ConvertKit (now rebranded to Kit in some markets, but widely still known as ConvertKit) sits between Substack and Beehiiv. It charges a 3.5% platform fee on paid newsletter revenue, plus Stripe processing at 2.9% and $0.30 per transaction, plus a monthly subscription based on your total subscriber count.

ConvertKit’s Pricing

ConvertKit’s subscription cost scales with your total email list size — free and paid subscribers combined. At up to 1,000 total subscribers, the Creator plan starts at $29 per month. At 5,000 subscribers, it is $79 per month. At 10,000 subscribers, it jumps to $119 per month. At 25,000, it is $199 per month. These costs apply regardless of how many of those subscribers are paying you.

This is a fundamentally different model from both Substack and Beehiiv. ConvertKit charges you based on the size of your free list, not just your paid subscriber count. A newsletter with 10,000 free subscribers and 200 paid subscribers pays the same ConvertKit subscription as one with 10,000 paid subscribers.

The Real Cost at Scale

Same scenario again: $10 per month, 200 paid subscribers. Assume 3,000 total subscribers (2,800 free, 200 paid), putting ConvertKit’s subscription at approximately $49 per month.

Gross monthly revenue: $2,000. ConvertKit platform fee (3.5%): $70. ConvertKit subscription: $49. Stripe processing: $58 plus $60, totaling $118. Combined costs: $237. You keep $1,763. Your effective cost rate is 11.85%.

ConvertKit lands between Substack ($318) and Beehiiv ($217) in total costs for this scenario. But the gap narrows or widens depending on your free-to-paid ratio. If you have 15,000 free subscribers feeding those 200 paid ones, your ConvertKit subscription jumps to $149 per month, pushing total costs to $337 — more than Substack.

What ConvertKit Does Best

ConvertKit’s strength is its email automation and segmentation tools. If your business model extends beyond a simple paid newsletter — if you sell digital products, run cohort-based courses, or manage complex funnel sequences — ConvertKit’s automation features justify the platform fee. It is an email marketing platform first and a newsletter platform second. That distinction matters if email is your primary sales channel, not just your content channel.

Real Revenue Math: Side-by-Side

Let’s standardize the comparison. You have a newsletter with 200 paid subscribers at $10 per month, 3,000 total subscribers, and offer an annual plan with a two-month discount.

Monthly Subscribers Only (200 at $10/mo)

	Substack	Beehiiv (Scale)	ConvertKit
Gross revenue	$2,000	$2,000	$2,000
Platform fee	$200 (10%)	$0 (0%)	$70 (3.5%)
Subscription cost	$0	$99	$49
Stripe processing	$118	$118	$118
Total costs	$318	$217	$237
You keep	$1,682	$1,783	$1,763
Effective rate	15.9%	10.85%	11.85%

With 50% Annual Subscribers

If half your 200 subscribers are on annual plans (paying $100 for 12 months instead of $120), your gross monthly revenue drops to $1,833. Annual subscribers generate $8.33 per month instead of $10, and Stripe processes their payments as a single annual transaction.

On Substack, annual subscribers reduce your platform fee proportionally (10% of $100 annually instead of 10% of $120). On Beehiiv, the $99 monthly cost stays fixed. On ConvertKit, the 3.5% applies to the discounted amount. Annual billing slightly favors Beehiiv and ConvertKit because their fixed costs do not scale down with the discount — but the reduced churn from annual plans typically more than compensates.

When Sponsorships Change the Equation

Paid subscriptions are not the only revenue stream for newsletters. Sponsorship revenue — where brands pay to be featured in your newsletter — can equal or exceed subscription income, and the platform you choose affects how much of it you keep.

How Newsletter Sponsorships Are Priced

Most newsletter sponsorships are priced on a CPM (cost per mille) basis — the rate per 1,000 opens, not per 1,000 subscribers. A newsletter with 10,000 subscribers and a 45% open rate has 4,500 opens per send. At a $50 CPM, a single sponsorship placement in that newsletter earns $225 per send. At twice-weekly sends with one sponsor per email, that is $1,800 per month.

CPM rates vary significantly by niche. Finance and B2B tech newsletters command $50 to $100+ CPM. Consumer lifestyle, health, and general interest newsletters typically see $20 to $40 CPM. Highly targeted niche newsletters (for example, a newsletter about Shopify analytics for e-commerce operators) can command $100+ CPM because the audience is precisely the buyer the advertiser wants to reach.

Platform Impact on Sponsorship Revenue

Here is where the platform choice gets interesting. Substack does not take a cut of sponsorship revenue — their 10% fee only applies to paid subscriptions. If you sell your own sponsorships, you keep 100% of that revenue on Substack (minus whatever payment processor you use for the sponsor invoice, which is typically a simple ACH transfer or PayPal with minimal fees).

Beehiiv offers a built-in ad marketplace that connects you with sponsors. You can also sell direct sponsorships. Beehiiv does not take a cut of direct sponsorship deals, but their ad marketplace takes a percentage when they source the sponsor for you.

ConvertKit does not have a built-in sponsorship marketplace. You sell and manage sponsorships yourself, keeping 100% of the revenue.

For a newsletter earning $1,800 per month in sponsorships on top of $2,000 in subscription revenue, the total monthly revenue is $3,800. On Substack, the platform fee only applies to the $2,000 (subscriptions), costing $200. On Beehiiv, the $99 subscription is your only platform cost regardless of total revenue. On ConvertKit, the 3.5% applies only to subscription revenue ($70), plus the monthly subscription.

Sponsorship revenue tilts the equation further toward Beehiiv and ConvertKit because their lower (or fixed) platform fees apply only to subscriptions, while the sponsorship income flows through with zero platform cut on any of the three platforms.

The Churn Problem

No newsletter platform comparison is complete without addressing churn, because churn determines whether your revenue grows, stagnates, or declines — and the effect compounds faster than most creators expect.

What Typical Churn Looks Like

Monthly churn rates for paid newsletters typically range from 4% to 7%. A 5% monthly churn rate means that out of 200 paid subscribers, 10 cancel each month. That sounds manageable. It is not.

At 5% monthly churn with no new subscribers, your 200 paid subscribers become 190 after month one, 154 after month six, and 108 after month twelve. You have lost nearly half your paying audience in a year. Your $2,000 monthly revenue drops to $1,080 — and that is before platform fees.

At 7% monthly churn, the decay is steeper: 200 becomes 172 after month three, 126 after month six, and 80 after twelve months. Your revenue collapses from $2,000 to $800 per month.

Net Growth: The Number That Actually Matters

Churn is not a death sentence if your growth rate exceeds it. If you convert 2% of your free subscribers to paid each month and you have 3,000 free subscribers, that is 60 new paid subscribers per month. With 5% churn on 200 paid subscribers (10 cancellations), your net growth is 50 subscribers per month. At that rate, you double your paid base in four months.

But free-to-paid conversion rates are highly variable. The typical range is 2% to 5% of free subscribers who convert to paid, and that conversion happens over the subscriber’s lifetime — not every month. A more realistic monthly conversion rate from your existing free base is 0.5% to 1%, meaning those 3,000 free subscribers yield 15 to 30 new paid subscribers per month. At 30 new and 10 churned, your net growth is 20 per month. Sustainable, but slower than the rosy projections suggest.

How Platform Choice Affects Churn

The platforms themselves do not dramatically affect churn rates — churn is primarily driven by your content quality, posting frequency, and the perceived value of your paid tier. However, the tools each platform offers for retention differ.

Substack’s community features (Notes, Chat, and the app) give paid subscribers additional reasons to stay beyond the email content itself. ConvertKit’s automation tools let you build re-engagement sequences that target at-risk subscribers before they cancel. Beehiiv’s analytics help you identify which content drives the most engagement, allowing you to double down on what retains subscribers.

None of these are silver bullets. The single most effective churn reduction strategy across all platforms is offering an annual plan. Annual subscribers have dramatically lower churn — not because they are more satisfied, but because they have prepaid and the friction of canceling before their term ends is high.

Which Platform Should You Choose

The decision framework is simpler than most comparison articles make it.

Choose Substack If

You are starting from zero and want to validate whether people will pay for your writing before committing to monthly platform costs. You value Substack’s built-in recommendation network and the organic discovery it provides. You are comfortable with the 10% fee as a permanent cost of doing business because you are trading that margin for zero operational overhead. You publish primarily written content (newsletters, essays, longform) and do not need complex automation or advanced segmentation.

Choose Beehiiv If

You already earn (or expect to soon earn) more than $1,000 per month in paid subscription revenue, making the $99 Scale plan cheaper than Substack’s 10% cut. You have your own growth channels and do not depend on platform-driven discovery. You want to maximize revenue retention as you scale — at $5,000 per month, you save over $400 per month compared to Substack. You want built-in referral programs and advanced growth tools.

Choose ConvertKit If

Your newsletter is part of a larger creator business that includes digital products, courses, or services. You need advanced email automation — welcome sequences, segmentation, conditional logic, and multi-product funnels. You want a lower platform fee than Substack (3.5% vs. 10%) and are willing to pay a monthly subscription that scales with your list size. Your free list is not disproportionately large relative to your paid subscriber count.

Tax Considerations

Regardless of which platform you choose, newsletter subscription revenue is self-employment income. You owe federal income tax plus self-employment tax (15.3% for Social Security and Medicare) on your net earnings after deducting platform fees and business expenses. On $2,000 per month in net newsletter revenue, self-employment tax alone is approximately $3,672 per year. Platform fees, software subscriptions, and other business expenses are deductible, so the platform costs discussed above reduce your taxable income. But the self-employment tax burden is consistent across all three platforms — it is a function of your income, not your platform choice.

Run Your Numbers

The right platform depends on your specific subscriber count, price point, growth rate, and revenue mix. General comparisons only go so far. Use our Substack calculator to model your paid subscription revenue after Substack’s fees, or our newsletter revenue calculator to compare subscription plus sponsorship income across platforms with churn and growth projections built in. Plug in your actual numbers and see what you keep.