Affirm advertises interest rates from 0% to 36% APR. That's a massive range — and the rate you actually get depends on your credit, the merchant, and the purchase. Let's demystify how Affirm pricing works so you know exactly what to expect before you click "buy."
How Affirm's Interest Rates Work
Unlike credit cards, which have a single APR that applies to everything, Affirm sets your rate at checkout for each individual purchase. Here's what goes into that rate:
- Your credit profile — Affirm looks at your credit history, income, and existing Affirm loans to determine your rate
- The merchant — Some merchants subsidize lower rates (or 0% APR) as a promotion
- The purchase amount — Larger purchases may qualify for better rates
- The loan term — Shorter terms (3–6 months) often have lower rates than longer ones (12–36 months)
The good news: Affirm shows you your exact rate and total cost before you commit. No surprises, no variable rates that change later. What you see at checkout is what you pay.
Affirm's Two Main Products
Pay in 4 — Always 0% APR
Affirm's Pay in 4 splits your purchase into 4 equal payments over 6 weeks. This option is always 0% APR with no fees, as long as you pay on time. It's available for purchases between $50 and $1,500 at participating merchants. No hard credit check is required.
Monthly Installments — 0% to 36% APR
For larger purchases or longer repayment periods, Affirm offers monthly installment loans with terms from 3 to 36 months. Your APR is determined at checkout and can range from 0% (on select merchant promotions or for excellent credit) up to 36% (for borrowers with lower credit scores).
Worked Examples: What a $500 Purchase Actually Costs
Let's run the numbers on a $500 purchase at three different APR levels so you can see the real impact:
Example 1: $500 at 0% APR (12 months)
| Detail | Amount |
|---|---|
| Purchase amount | $500.00 |
| APR | 0% |
| Monthly payment | $41.67 |
| Total interest | $0.00 |
| Total cost | $500.00 |
At 0% APR, you pay exactly the purchase price — nothing more. This is the best-case scenario and is typically available through merchant promotions or for borrowers with excellent credit.
Example 2: $500 at 15% APR (12 months)
| Detail | Amount |
|---|---|
| Purchase amount | $500.00 |
| APR | 15% |
| Monthly payment | $45.07 |
| Total interest | $40.84 |
| Total cost | $540.84 |
At 15% APR — a typical rate for someone with fair-to-good credit — you pay about $41 in interest over 12 months. That's roughly 8% of the purchase price. Not terrible, but not free either.
Example 3: $500 at 36% APR (12 months)
| Detail | Amount |
|---|---|
| Purchase amount | $500.00 |
| APR | 36% |
| Monthly payment | $50.21 |
| Total interest | $102.52 |
| Total cost | $602.52 |
At 36% APR — the maximum Affirm charges — you pay over $100 in interest on a $500 purchase. That's a 20.5% effective cost on top of the purchase price. At this rate, you should seriously consider other options.
Affirm vs. Credit Card APR
How does Affirm's rate compare to what you'd pay on a credit card?
| Option | APR Range | $500 Cost (12 mo) | Late Fees |
|---|---|---|---|
| Affirm (0%) | 0% | $500.00 | None |
| Affirm (15%) | 0–36% | $540.84 | None |
| Affirm (36%) | 0–36% | $602.52 | None |
| Credit card (avg 24.99%) | 20–30% | $568.00 | Up to $41 |
| 0% intro APR card | 0% (12–21 mo) | $500.00 | Up to $41 |
A few things stand out:
- Affirm at 0% is tied with a 0% intro APR card — both cost exactly the purchase price. But the credit card earns rewards, making it technically cheaper.
- Affirm at 15% beats a typical credit card at 24.99% APR by about $27 on a $500 purchase. Plus Affirm has no late fees.
- Affirm at 36% is the most expensive option — even a credit card at 24.99% APR costs less. If Affirm quotes you 30%+, look elsewhere.
- Affirm's no-late-fee policy is a real advantage. A credit card late fee can be up to $41, which adds to the cost if you ever miss a payment.
How to Get the Best Affirm Rate
- Shop at merchants with 0% promotions. Amazon, Walmart, Peloton, and others frequently offer 0% APR through Affirm. This is the easiest way to get the best rate.
- Improve your credit score before applying. Even a 20–30 point improvement can drop your rate by several percentage points. Pay down existing balances and avoid new credit inquiries in the months before a big purchase.
- Choose shorter loan terms. Affirm often offers lower APRs for 3–6 month terms compared to 12–36 month terms. If you can afford higher monthly payments, you'll save on total interest.
- Use Pay in 4 when possible. For purchases under $1,500 that you can pay off in 6 weeks, Pay in 4 is always 0% APR with no credit check.
🧮 See What You'd Actually Pay
Enter your purchase amount and compare Affirm rates, credit cards, BNPL, and personal loans. Our free calculator shows the real cost of every option.
Try the Calculator →FAQ
What interest rate does Affirm charge?
Affirm charges interest rates ranging from 0% to 36% APR, depending on your credit profile, the purchase amount, and the merchant. Pay in 4 purchases are always 0% APR. Monthly financing rates are set at checkout and shown to you before you commit.
How can I get 0% APR with Affirm?
Affirm's Pay in 4 option is always 0% APR — no credit score requirement. For monthly financing, 0% APR is typically offered on select merchant promotions or to borrowers with good-to-excellent credit (670+ FICO). Some merchants like Amazon and Peloton frequently offer 0% APR deals through Affirm.
Does Affirm charge late fees?
No. Affirm does not charge late fees, which is one of their key differentiators from Klarna and Afterpay. However, missed payments can be reported to credit bureaus and hurt your credit score, and you may lose access to future Affirm financing.
Is Affirm cheaper than a credit card?
It depends on your rate. Affirm's 0% APR deals are cheaper than any credit card. At 15% APR, Affirm is competitive with credit cards but lacks rewards. At 30–36% APR, most credit cards (typically 20–29% APR) would be cheaper. Affirm shows you the exact total cost upfront, so you can compare directly.