Stripe vs Polar — the fee comparison misses the actual decision
Polar is a merchant of record, Stripe is not. That single difference decides who owes sales tax in twenty jurisdictions — and it matters more than the percentage on the pricing page. With real August 2026 numbers.
Every "Stripe vs Polar" comparison leads with fees. Fees are the least important part.
The actual difference is legal: Polar is the merchant of record. Stripe is not. Polar sells your product to your customer and then pays you. Stripe moves money on your behalf while you remain the seller. Everything else — the percentages, the payout timing, the dashboard — follows from that one fact.
FlareStarter Pro ships with Stripe, so this is not a neutral post. But the honest answer is that Stripe is the wrong default for a lot of small SaaS businesses, and the reason has nothing to do with the 2.9%.
What merchant of record actually means
If you are the merchant of record, you are the seller. That means you are the one who has to:
- Register for VAT/GST/sales tax in each jurisdiction once you cross its threshold
- Charge the correct rate for the customer's location
- File and remit returns, on each jurisdiction's schedule, forever
- Handle audits
The EU expects VAT registration from the first euro on digital goods sold to consumers. US sales tax thresholds vary by state. None of this is optional once you cross a threshold, and none of it is interesting work.
If Polar is the merchant of record, all of that is theirs. You get one payout relationship. That is the product. The percentage is what it costs.
Stripe Tax does not change this. It calculates the correct rate and tracks your thresholds — genuinely useful — but you remain the seller and the liability stays yours. Stripe Tax Basic is 0.5% per transaction for calculation only; filing is a separate, pricier tier (Tax Complete, from $90/month).
The fee math, done honestly
US rates as published on 2026-08-23. Verify before budgeting; these move.
Stripe, for a subscription business:
| Component | Rate |
|---|---|
| Card payments (domestic) | 2.9% + $0.30 |
| Stripe Billing (pay-as-you-go) | 0.7% |
| Stripe Tax (Basic, calculation only) | 0.5% |
| Effective | ~4.1% + $0.30 |
| International cards | +1.5% |
| Currency conversion | +1% |
| Dispute | $15 |
Polar, merchant of record included:
| Plan | Rate |
|---|---|
| Starter (free) | 5% + 50¢ |
| Pro ($20/mo) | 3.8% + 40¢ |
| Growth ($100/mo) | 3.6% + 35¢ |
| Scale ($400/mo) | 3.4% + 30¢ |
| International cards | +1.5% |
| Payout | $2/mo + 0.25% + $0.25 per payout |
| Currency conversion | 0.25% (EU) to 1% elsewhere |
| Dispute | $15 |
Run it on a $100 subscription charge:
- Stripe, full stack: $4.10 + $0.30 = $4.40
- Polar Starter: $5.00 + $0.50 = $5.50
- Polar Pro: $3.80 + $0.40 = $4.20, plus $20/month
Polar Pro is about $0.20 cheaper per $100 charge than the full Stripe stack, so its $20/month platform fee breaks even at roughly 100 such charges a month (~$10k MRR). Below that, Stripe is cheaper on paper. Above it, Polar Pro is cheaper and absorbs your tax compliance.
Two caveats that matter:
The Stripe number assumes you use Billing and Tax. Implement subscriptions against the raw Payments API and handle tax yourself and Stripe is 2.9% + $0.30 — clearly cheaper. You have moved work onto yourself, not eliminated it.
Polar's payout fees are not zero. $2/month plus 0.25% + $0.25 per payout is small, but it sits on top of the headline rate, and currency conversion outside the EU reaches 1%.
What you give up with a merchant of record
Posts selling you on Polar tend to skip these:
- You do not own the payment relationship. The MoR does. Migrating away later means your customers re-enter payment details — churn you pay for once.
- Payouts are slower than Stripe's rolling schedule, because the MoR settles to you after collecting.
- Less control over checkout and dunning. You get theirs.
- Fewer payment methods and geographies than Stripe, which supports a very long tail of local methods.
- Concentrated platform risk. A younger company holds your revenue relationship.
When Stripe is the right answer
- You already have tax handled — an accountant, an entity, registrations where you sell.
- You sell B2B in one country, where thresholds are distant and compliance is simple.
- You need control: custom checkout, usage-based metering, marketplaces, Connect, complex proration.
- You are at scale. At high volume, 2.9% plus doing your own compliance beats 3.4–3.8% every time — compliance is a fixed cost, percentage fees are not.
- You need the ecosystem. Every tool integrates with Stripe first.
When Polar is the right answer
- You are solo or a small team selling globally, and the alternative is either ignoring VAT — a liability you are quietly accruing — or paying real money to accountants.
- You sell digital products to EU consumers, where VAT registration starts immediately.
- You are under roughly $10k MRR and compliance overhead would exceed the fee difference.
- You would rather ship product than file returns. That is a legitimate business decision, not laziness.
What we ship, and why
FlareStarter Pro uses Stripe: seat-based subscriptions per organization, metered credits, and webhook handlers where every money-moving mutation carries an idempotency ref, so replays and retries are free.
That choice is about control, not cost. Seat billing that syncs quantity as members join and leave, credit top-ups reconciled by a daily cron, and usage metering are all built against Stripe's primitives. A merchant of record abstracts the payment layer — and that abstraction is exactly what you do not want when billing is the product surface.
If you are selling something simpler — one price, one checkout, global consumers — that abstraction is a feature, and Polar is likely the better call.
The summary
Do not choose on the percentage. Choose on this: when a tax authority in a country you have never visited sends a letter, whose name is on it?
If you want that to be someone else's problem, pay a merchant of record and stop reading comparison posts. If you want control over billing and can carry the compliance, use Stripe. The 0.4% is noise next to that question.
FlareStarter Pro ships the Stripe half of this wired end to end — organizations with seat billing, metered credits, replay-safe webhooks, and an audit trail.
Fees are from Stripe's US pricing page and Polar's published fee schedule as of 2026-08-23. Both change; verify before you budget.