Cash vs. 0% Financing Calculator
Is keeping your cash worth using the financing offer?
Compare paying cash with using a promotional financing offer and keeping your money available or invested during the promotional period.
Retained cash
Estimate what the cash you keep could earn during the promotional period. Enter an after-tax return when possible.
Offer type
The post-promotional APR is shown for context. This calculator assumes the promotional balance is fully paid during the stated period.
Cash vs. 0% Financing Calculator
Enter your purchase and financing assumptions.
The values above are example assumptions. Change them to model your own purchase before relying on the result.
Why This Decision Matters
A genuine 0% financing offer can change the economics of a purchase because it lets you delay payments without charging interest during the promotional period. But “0% interest“ does not automatically mean financing is cheaper than paying cash.
The comparison depends on the price you pay under each option, any financing fees, and what you could realistically earn or preserve by keeping the cash instead of spending it immediately.
There is also an important distinction between a true 0% APR promotion and a deferred-interest offer. Those structures can look similar in advertisements but have different consequences if the promotional requirements are not satisfied.
Start With The Offer
Make sure you know what kind of promotion you are getting.
Link copiedA true 0% APR purchase promotion means interest is not charged on the promotional balance during the stated promotional period, subject to the terms of the offer. If a balance remains afterward, interest can begin accruing on that remaining balance according to the card or financing agreement.
A deferred-interest promotion works differently. CFPB describes these offers as arrangements where interest can accrue during the promotional period but is not owed if the qualifying balance is paid in full by the specified deadline. If the requirements are not met, previously deferred interest may become payable.
True 0% APR
- No interest is charged during the promotional period under the promotion's terms.
- A remaining balance can begin accruing interest after the promotional period ends.
- You still need to understand the required payments and other account terms.
Deferred interest
- Interest can accrue during the promotional period.
- The accrued interest may be waived when the applicable requirements are satisfied.
- Failing to satisfy the promotion can create a substantially different final cost.
Read the actual promotional disclosure before entering the calculator. The calculator can compare the basic economics, but it should not be treated as a substitute for the financing agreement.
The First Comparison
A cash discount is a real financing cost.
Link copiedSuppose a seller offers two prices:
Pay cash
You pay the lower cash price immediately and give up the opportunity to keep that money available.
Use financing
You retain the cash, but you may pay a higher purchase price, financing fee, or other cost for the ability to delay payment.
A $200 financing premium is not automatically overcome by the fact that the financing has a 0% promotional rate. The retained cash has to generate enough economic value to compensate for that $200 difference.
This is why the calculator asks for both the cash price and the financed purchase price instead of assuming that the two are always identical.
The Economic Tradeoff
Paying cash has an opportunity cost.
Link copiedWhen you pay $5,000 in cash, the purchase is complete, but you no longer have that $5,000 available for another purpose. With 0% financing, some of that cash can remain available while you make the required payments over time.
The potential value of that retained money is the opportunity cost that matters in this comparison.
The basic idea
Value of retained cash
compared with
additional cost of financing
Financing becomes more attractive when the economic value of the retained cash exceeds the additional price, fees, and other costs associated with financing.
The return assumption should be realistic. Cash that remains in a checking account may earn little or nothing. Money placed in a savings or investment vehicle may earn more, but the return can vary and may involve taxes or investment risk.
Look Beyond APR
A 0% APR does not necessarily mean $0 financing cost.
Link copiedThe promotional interest rate is only one part of the comparison. Financing can also involve fees or a higher purchase price.
Higher purchase price
A seller may offer a lower cash price and a higher price when you choose financing.
Financing fee
An upfront or account-level fee increases the effective cost of using the promotion.
Lost discount
A rebate or cash discount available only without financing is economically equivalent to an added financing cost.
Put every known cost into the calculator rather than looking only at the advertised APR.
The Deadline Matters
Calculate the payment you need—not just the minimum payment.
Link copiedA promotional financing offer works best when the balance is paid according to a deliberate schedule rather than left to the minimum payment.
CFPB specifically cautions that minimum payments on deferred-interest promotions may not be enough to eliminate the promotional balance by the deadline.
Starting point
Promotional balance ÷ promotional months
For a simple true-0% purchase with no fees or additional balances, dividing the promotional balance by the number of months provides a useful starting point for the required payment.
The actual agreement can have different billing dates, minimum payment rules, and allocation provisions. Use the lender's terms to determine the payment schedule that keeps the promotion in compliance.
Important Distinction
Deferred interest deserves its own decision.
Link copiedAn offer that says “no interest if paid in full“ should not be treated as interchangeable with a straightforward 0% APR promotion. CFPB explains that deferred-interest plans can result in interest going back to the original purchase date when the balance is not paid as required.
Read the promotion before calculating the return.
- Find the exact date the promotional period ends.
- Determine the balance that must be paid to satisfy the promotion.
- Identify the APR associated with the deferred balance.
- Understand how other balances and payments are treated.
- Do not assume the minimum payment will satisfy the promotion.
The calculator intentionally does not estimate retroactive deferred interest. The terms vary by promotion, so a generic assumption could give a false sense of precision.
What Happens To The Cash?
The value of retained cash depends on what you do with it.
Link copiedFinancing only creates an opportunity if the money you keep actually remains available or earns something useful. The calculator therefore models the cash balance declining as you make the monthly payments.
Keep it liquid
The money remains available for emergencies or other near-term needs. The financial return may be modest, but liquidity itself can have practical value.
Save it
Money held in an interest-bearing savings vehicle can generate a measurable return without taking the same market risk as an investment portfolio.
Invest it
A higher expected return may be possible, but investment returns are uncertain. A stock-market return should not be treated as a guaranteed financing benefit.
For a conservative comparison, use a return assumption that reflects where you would genuinely keep the money rather than selecting an optimistic investment return simply to make financing look attractive.
Pay Cash
Paying cash becomes more attractive when the financing premium is large.
Link copiedThere is a meaningful cash discount
A substantial price difference can outweigh the earnings available from retaining the money during the promotional period.
You would not earn much on the retained cash
When the money would otherwise sit in a low-yield account, there may be little opportunity value from keeping it.
The payment obligation would strain your budget
Even an economically attractive promotion may not fit your household cash flow. The required payment should be sustainable throughout the promotional period.
The promotion is complicated
Complex terms, deferred interest, or a high risk of missing the payoff deadline deserve additional scrutiny.
Use Financing
0% financing becomes more attractive when the terms are genuinely favorable.
Link copiedThe cash and financed prices are identical
With no fees and no price premium, the financing option can let you retain cash without an explicit financing charge during the promotional period.
Your retained cash earns a meaningful return
The higher the realistic after-tax return on the declining cash balance, the greater the potential economic benefit from delaying payment.
You have the cash available
A 0% offer is most useful when the purchase is already financially supported by available cash rather than being used to stretch beyond what you can afford.
The payoff schedule is manageable
You can make the required payments throughout the promotional period without depending on an uncertain future source of income.
Real-World Scenarios
Small changes in the assumptions can change the result.
Link copiedSame price, no return
A $5,000 cash price and $5,000 true-0% financed price with no earnings on retained cash are approximately equal economically, assuming the promotional balance is fully paid on time.
Same price, positive return
If the financed price and cash price are identical and the retained cash earns a positive after-tax return, financing can produce an economic advantage because the payments occur over time.
Cash price is $200 lower
A $4,800 cash price versus a $5,000 financed price creates a $200 financing premium. The retained cash must generate enough value during the promotional period to overcome that difference.
Deferred-interest promotion
Even when the basic price comparison looks attractive, the consequences of failing to satisfy the promotional terms can be materially different from a true 0% APR offer.
A Practical Rule of Thumb
Take these steps before making your decision.
- Confirm whether the offer is true 0% APR or deferred interest.
- Compare the actual cash price with the actual financed price.
- Include financing fees, lost rebates, and other costs.
- Use a realistic after-tax return for the cash you would retain.
- Model the retained cash declining as you make the required payments.
- Make sure the required monthly payment fits comfortably within your cash flow.
- Know the exact date the promotional period ends.
- Do not rely on a promotional minimum payment without confirming that it will satisfy the offer.
- Treat investment returns as uncertain rather than guaranteed financing savings.
- Keep enough liquid cash for your other financial obligations and emergencies.
Questions to Ask Before Choosing 0% Financing
Have a better conversation.
The answers should come from the actual financing offer and your own financial situation.
Is this a true 0% APR promotion or a deferred-interest offer?
What is the cash price?
What is the financed purchase price?
Are there financing, origination, account, or other fees?
Do I lose a cash discount, rebate, or other incentive by financing?
How long does the promotional period last?
What monthly payment will fully eliminate the balance before the deadline?
What happens if a balance remains when the promotion ends?
Where would the retained cash realistically be kept?
What after-tax return should I reasonably expect from that cash?
Could I make every required payment even if my income or expenses changed?
Would using the retained cash for this purpose interfere with my emergency reserve or another financial goal?
Key Takeaways
- A 0% APR offer is not automatically cheaper than paying cash.
- Compare the actual cash price with the actual financed price.
- Financing fees and lost cash discounts can make a nominally interest-free offer expensive.
- The value of retained cash is an opportunity-cost calculation, not free money.
- The calculator models retained cash month by month rather than assuming the entire amount earns a return for the full promotional period.
- Use a realistic after-tax return assumption and recognize that investment returns are uncertain.
- A true 0% APR promotion and a deferred-interest promotion are different structures.
- The promotional payoff deadline matters just as much as the advertised interest rate.
- A financing strategy only works when the required payments fit your actual cash flow.
- Read the specific financing agreement before relying on the calculator's result.
Sources
Consumer Financial Protection Bureau
I got a credit card promising no interest for a purchase if I pay in full within 12 months. How does this work?
Consumer Financial Protection Bureau
How to understand special promotional financing offers on credit cards
Consumer Financial Protection Bureau
Appendix M1 to Part 1026 — Repayment Disclosures
Consumer Financial Protection Bureau
§ 1026.16 Advertising