Balance Transfers: When 0% Saves Money and When It Costs More
Balance Transfers: When 0% Saves Money and When It Costs More
Moving a $6,000 balance at 24% to a 0% card with a $240 fee costs about $278 in total if you keep paying $300 a month, against $1,739 of interest staying where you are. Pay only the $62 minimum the new statement asks for, and the same transfer ends up costing $4,959. The offer is not the variable. The payment is.
What you'll learn
The arithmetic when it works
A $6,000 card balance at 24%. A balance transfer offer: 0% for 18 months, with a 4% transfer fee, so $240, added to the new balance.
| Plan, paying $300 a month | Months to clear | Total cost |
|---|---|---|
| Stay on the 24% card | 26 | $1,739 of interest |
| Transfer, keep paying $300 | 21 | $278: the $240 fee plus $38 of interest on the last $840 after the promotion ends |
The transfer saves about $1,460 and clears the debt five months sooner. That is a real result, and it is the case the offer is designed around. It depends entirely on one assumption: that the payment stays at $300.
To clear the whole $6,240 inside the 18 months, the payment has to be $347 a month. That is the number to put in the calendar, not the minimum the statement will ask for.
The arithmetic when it does not
On a 0% balance, the minimum payment is often around 1% of the balance, here about $62. A cardholder who sees a small required payment and no interest charge has every reason to pay it, and many do.
- After 18 months at $62, $5,117 is still owed, and the rate moves to the card's standard rate, say 27%.
- Paying $150 a month from there takes 66 more months and costs $4,719 of interest.
- Total cost: $240 plus $4,719, against $1,739 for doing nothing at all.
The offer is profitable for the issuer precisely because of this second path. Per our present bias analysis, a structure that makes the present cheap and the future expensive is chosen more often than its price justifies, and per our deferred interest analysis, a promotional rate that ends on a date is priced on the share of customers who reach that date still owing.
Balance transfer is not deferred interest, and the difference matters
On a true 0% balance transfer, when the promotion ends, interest starts on whatever is left from that date forward. On a deferred-interest promotion, more common on store cards, interest that was accruing all along is charged retroactively if the balance is not cleared in full. Read which one you are being offered. The first is forgiving of a small remaining balance. The second can turn $180 left over into hundreds in back interest.
The fee as a rate, and moving more than one balance
A 4% fee for 18 months of 0% is equivalent to borrowing at roughly 2.7% a year simple, for as long as the balance actually sits at 0%. That is the right number to compare against the card you are leaving, and it explains why the transfer beats almost any other option when the balance is cleared on time. It also explains why the fee is wasted on a balance that is still there when the promotion ends: the 2.7% was the price of 18 months, and a balance that needs 30 months has bought only part of what it needs.
When a household carries several cards, the transfer limit rarely covers all of them, and the order matters. Take $4,000 at 27% and $3,000 at 19%, with a new card that allows $5,000 including fees.
- Move the 27% balance in full: $4,000 plus a $160 fee.
- Move $800 of the 19% balance with what is left: $800 plus a $32 fee, bringing the new card to $4,992.
- Interest avoided in the first year is about $1,232, for $192 of fees.
Highest rate first is the rule, and per our card interest analysis it is the same rule the law applies to payments above the minimum. The remaining $2,200 at 19% then gets every dollar of extra payment until it is gone, while the transferred balance gets exactly the clearing amount and nothing more.
Four ways a good transfer goes wrong
- New purchases on the same card. Purchases usually carry the standard rate from day one. Per our payment allocation analysis, payments above the minimum generally go to the highest-rate balance first, which helps, but the minimum may go to the 0% balance, and a card carrying both is harder to clear than it looks.
- A late payment. Many offers end the promotional rate on a missed or late payment. Per our late payment analysis, the reported late is a separate and lasting cost.
- Running the old card back up. A transfer that clears one card and frees its limit is only a saving if the freed limit stays unused. Otherwise the household now has two balances.
- Chaining transfers. Moving the remainder to a new card at the end of each promotion can work, and each move costs another fee and another hard inquiry, and depends on still qualifying.
The third trap is the one that turns a refinancing into a doubling. Per our revolver analysis, households that carry card debt often do so because spending runs ahead of income, and moving the balance does not change that. A transfer fixes the price of existing debt. It does nothing about the flow that created it.
What it does to your credit file
- A hard inquiry, and per our inquiry analysis, a small, temporary effect.
- A new account, which lowers the average age of accounts.
- High utilization on the new card. $6,240 on a $7,000 limit is 89%, and per our utilization analysis, per-card utilization is read as well as the overall figure.
- Lower overall utilization once the old card is paid, since total available credit has risen, provided the old card stays open and unused.
Closing the old card after the transfer is usually a mistake for the score, because it removes its limit from the utilization calculation. Per our card closing analysis, keeping it open with no balance is generally the better move, unless the card itself carries a fee or the temptation to reuse it is the real risk.
Utilization and inquiries are part of the cost of a transfer
A transfer adds an inquiry, a new account and a high per-card balance to your file. HL Hunt Personal Credit Builder reports an on-time installment tradeline every month, which adds the payment history and account mix that offset those effects while the transferred balance comes down.
Deciding whether to transfer
- Compute the payment that clears the balance inside the promotion, fee included. Here, $347 a month.
- Be honest about whether you will pay it. If not, compare the realistic path, not the advertised one.
- Compare the fee to the interest saved at the payment you will actually make. At $300 a month, $240 of fee saved about $1,460.
- Check whether the offer is true 0% or deferred interest.
- Do not use the new card for purchases, and set autopay at the clearing amount, not the minimum.
- Keep the old card open and at zero.
- Consider the alternative. Per our consolidation analysis, a fixed-term personal loan forces the payment that a transfer only suggests, at a higher rate but with no cliff.
Item seven is the right answer for people who know they will not hold themselves to item one. A consolidation loan at 12% with a fixed 24-month schedule costs more than a transfer paid perfectly and far less than a transfer paid at the minimum, because the structure does the discipline. Per our prepayment analysis, the schedule is the product.
Frequently asked questions
Yes if you keep paying. $6,000 at 24% moved to 0% with a 4% fee cost $278 total at $300 a month, versus $1,739 staying put.
It can cost more than not transferring. Paying the $62 minimum here led to $4,959 of total cost against $1,739 staying on the original card.
No. A 0% transfer charges interest only from the end date on what is left; deferred interest charges all the back interest if anything remains.
A hard inquiry, a new account, and high utilization on the new card; overall utilization improves if you keep the old card open at zero.
Key takeaways
- A $6,000 transfer from 24% to 0% with a 4% fee costs about $278 if you keep paying $300 a month.
- Staying on the 24% card at the same payment costs $1,739 of interest over 26 months.
- Clearing the full $6,240 within an 18-month promotion takes $347 a month.
- Paying only the roughly $62 minimum leaves $5,117 at the end, and the transfer ends up costing $4,959.
- True 0% transfers charge interest only from the end date; deferred interest charges it all retroactively.
- New purchases, a late payment, reusing the old card, and chaining transfers are the common failures.
- Keep the old card open and at zero; closing it usually hurts utilization.
- A fixed-term consolidation loan costs more than a perfect transfer and far less than a minimum-payment one.
This guide is educational and does not constitute financial advice. All figures are stylized illustrations using assumed balances, rates, transfer fees, promotional terms, minimum payment formulas, and limits, and do not describe any particular card or issuer. Balance transfer terms, fees, minimum payment calculations, penalty provisions, and the treatment of promotional balances vary by issuer and change over time. Read the offer terms before transferring.