0% Intro APR: The Fee, the Cliff, and Deferred Interest
Three different products get called "0% financing." One is a good deal, one is a deadline, and one is a trap that charges you interest retroactively.
Editorial note: Our content is independently written. We may earn a commission from partner links. Learn more.
Key takeaways
- Standard 0% intro APR: nothing retroactive, but the remaining balance jumps to 25%+ when the promo ends.
- A 3–5% transfer fee on an 18-month promo is roughly equivalent to a 6.7% APR loan.
- Deferred interest ("no interest if paid in full") charges all accrued interest retroactively if $1 remains at the deadline.
1. Standard 0% intro APR (bank cards)
Purchases or transfers accrue no interest for 12–21 months. When the promo ends, the remaining balance starts accruing at the regular APR going forward. Nothing retroactive. The risk is the cliff: a balance you didn't clear is now at 25%+.
2. Balance transfer fees
Usually 3–5% of the amount moved, added to the balance up front. "0%" with a 5% fee on an 18-month term is roughly equivalent to a 6.7% APR loan. Still good, but not free.
3. Deferred interest (store and retail cards)
"No interest if paid in full in 12 months"
This phrase means interest has been accruing the whole time at the regular APR (often 29.99%). If $1 remains at month 12, the issuer charges all 12 months of accrued interest on the original balance.
Deferred-interest promotions are legal and must be disclosed, but the disclosure is one sentence most people skim. A $3,000 furniture purchase at 29.99% deferred, with $100 left at the deadline, can trigger roughly $900 in back interest.
The rules for each
- Standard 0%: divide the balance by (promo months minus 2) and autopay that amount. Don't add new purchases.
- Transfer fee: compare the fee to the interest you'd pay on a consolidation loan over the same period.
- Deferred interest: pay it off a month early or don't use it. There is no middle setting.
The rule
Pay it off a month early or don't use it. There is no middle setting.
