Car Affordability Calculator – How Much Car Can You Honestly Afford?
A car is not affordable because a loan fits this month. It is affordable when the payment, the insurance and the down payment all sit comfortably inside your budget — with room left for fuel and repairs. Enter what you can genuinely spend each month, and this calculator works backwards to the sticker price your budget can carry.
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The car you can carry
Where the money goes
Read this before you shop
That price already spends your whole $600 budget on payment and insurance alone. Fuel, servicing, tires and the odd repair still have to come from somewhere — most owners find they run to another $150 to $300 a month on an everyday car. If that money is not in the rest of your budget, shop below this number, not at it.
- Affordable price comes from the payment you can carry: the default budget gives a $27,193.30 price on a $22,193.30 loan.
- The 20/4/10 rule is applied to the default numbers in the guide — down payment, term and income share all bound the answer.
- Term sensitivity matters: the same payment buys four different loans at four terms, and the calculator leaves some costs out on purpose.
- What makes up the price
- Pairs well with this calculation
- Car affordability in three steps
- How the car affordability calculator works
- Going deeper
- The 20/4/10 rule, applied to the default numbers
- Term sensitivity: the same payment, four different loans
- Down payment leverage, and the rate you actually get
- What the calculator leaves out, on purpose
- Frequently asked questions
What makes up the price
Every car price is two piles of money: the part the bank lends you and the part you bring yourself. The bigger your pile, the less interest you feed the bank.
Interest is charged on the loan pile only. Shifting money from the loan pile into the down-payment pile — a cheaper car, or a few more months of saving — cuts the interest bill on every remaining payment.
The honest part: a payment is not the cost of a car
This calculator answers one question well — what price fits the monthly budget you set. It cannot make the car cheap to run. Budget separately for fuel, routine servicing, tires and brakes, and a repair fund, because an older or larger car can double those bills. And remember the sticker price is not the checkout price either: sales tax, title and registration fees ride on top at purchase time, unless you roll them into the loan — which means paying interest on the tax too.
Pairs well with this calculation
Once you know your price ceiling, these work out the loan itself.
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Car affordability in three steps
Set the monthly budget first
Decide what the car may cost you each month in total — either a figure you already know, or a sane share of your income. Deciding this before you visit a single listing is what keeps the budget in charge of the shopping, not the other way round.
Take insurance off the top
Insurance is not optional and it is not small, especially on a financed car that must carry full cover. Subtract a realistic monthly insurance cost from the budget. Only what remains is allowed to become a loan payment.
Turn the payment into a price
A monthly payment, an interest rate and a term together fix exactly how much a lender is effectively handing you. Add your down payment to that loan amount and you have the highest sticker price your budget can honestly carry.
How the car affordability calculator works
loan = monthly payment × [ 1 − (1 + r)−n ] ÷ r · price = loan + down payment
The example on this page. A $600 monthly budget, minus $150 of insurance, leaves $450 for the payment. At 8% APR over 60 months the bracket above is worth 49.3184, so the loan is $450 × 49.3184 = $22,193.30. Add the $5,000 down payment and the ceiling is $27,193.30. The 60 payments total $27,000, of which $4,806.70 is interest — the price of borrowing the $22,193.30.
Why the bracket? Each monthly payment is worth a little less than the one before it, because money paid later has had less time working against the interest. The bracket adds up the present value of all n payments at once — it is the standard annuity factor, the same one lenders use in reverse to set your payment from a loan amount. This page simply runs it the other way: payment in, loan out.
A 0% APR deal. When the rate is zero there is no interest to discount, so the factor is just the number of months. $360 a month for 48 months at 0% is a loan of exactly $17,280 — every cent of every payment goes to the car itself. Zero-percent offers are the one time a longer term costs nothing extra in interest, though the price of the car itself may be less negotiable.
The income mode. Picking a percentage simply sets the budget for you: 15% of a $5,000 monthly income is a $750 all-in car budget. From there the maths is identical — insurance comes off first, and the rest becomes the payment. The percentage is doing the budgeting; the calculator is only doing the arithmetic.
Going deeper
The 20/4/10 rule is the best-known guardrail for car buying, and each number guards against a different failure. The 20 says put at least 20% down. A new car loses value fastest in its first years; a small down payment can leave you owing more than the car is worth, which traps you if you need to sell or the car is written off.
The 4 says borrow for no more than four years — 48 months. Long terms are how expensive cars get made to look affordable: stretch a loan to 72 or 84 months and the payment shrinks, but the total interest balloons and you can end up paying for a car long after you are tired of it. The 10 says keep total car costs — payment plus insurance — at or under 10% of your gross monthly income. It is the strictest of the three, and the one most people bend. This page lets you test yourself against it directly: income mode, the 10% option, a 48-month term, and a down payment near 20% of the price it gives you.
Stretching the term is the easiest way to make this calculator print a bigger number, and the most expensive. Take the example on this page: $450 a month at 8% APR supports a loan of $22,193.30 over 60 months, with $4,806.70 of interest. Run the same $450 over 84 months and the loan grows to about $28,900 — but the interest bill grows to about $8,900. The extra car you “afforded” cost roughly $4,100 in additional interest, and for the last two years of the loan you are paying for a car that is seven years old.
There is a second, quieter risk: owing more than the car is worth. Cars lose value on their own schedule, not your loan’s schedule, and long loans pay down slowly at first because most of each early payment is interest. If the car is stolen or written off mid-loan, the insurer pays what it was worth — and the gap between that and your remaining balance is yours to find. A shorter term and a real down payment are the two defences, which is exactly why the 20/4/10 rule insists on both.
The 20/4/10 rule, applied to the default numbers
The FAQ above names the 20/4/10 rule: put at least 20 percent down, finance for no more than four years, and keep total car costs within 10 percent of gross income. The rule is a discipline, not a law of nature, and applying it to the defaults on this page shows both its value and its strictness. The defaults use a $600 monthly budget against $5,000 of monthly take-home income, with $150 of insurance, leaving $450 for the loan payment, a $5,000 down payment, 8 percent APR and a 60-month term. Against the rule, the defaults fail two of the three tests: the term is five years, not four, and the budget is 12 percent of income, not 10 percent. Only the down payment passes, and only just: $5,000 against a $27,193.30 price is 18.4 percent, close to but below the 20 percent guideline.
Run the rule-compliant version and the price falls sharply, which is the point of the rule. Cap the budget at 10 percent of $5,000, which is $500, take off the same $150 of insurance, and $350 remains for the payment. At 8 percent over 48 months the annuity factor is 40.9619, so the loan is $350 times 40.9619, which is $14,336.67. With a 20 percent down payment the price is the loan divided by 0.8, which is $17,920.84, with $3,584.17 down. The rule-compliant car costs $9,272 less than the default’s $27,193.30, and its 48 payments total $16,800, of which $2,463.33 is interest, against the default’s $27,000 of payments and $4,806.70 of interest. The difference is not a rounding effect; it is the compound effect of all three rules working together, shorter term, smaller payment and larger down payment share, each pulling the same direction.
Whether to follow the rule strictly is a judgment, and the honest case against strictness is that reliable cars at rule-compliant prices are not available in every market, and that a buyer with stable income and low other debts can carry a longer term safely. The honest case for it is that the rule protects against the two risks the calculator cannot see: being upside down, owing more than the car is worth, which long terms and small down payments make likely, and being unable to absorb the running costs the FAQ above names, fuel, servicing, tires and repairs at $150 to $300 a month on an everyday car, which sit outside the budget this page computes. A buyer who breaks the term rule should do so knowing the interest cost and the upside-down risk, and a buyer who breaks the income-share rule should do so knowing the running costs still have to come from somewhere. The calculator prices the loan; the rule prices the risk.
Term sensitivity: the same payment, four different loans
The term is the lever most buyers negotiate without understanding, because a longer term lowers the payment while raising the total cost, and the payment is what the showroom talks about. The table below holds the payment fixed at the default’s $450 a month and the rate fixed at 8 percent, and varies only the term. The loan amounts and interest totals are computed by this calculator’s own annuity formula, loan equals payment times the bracket factor, and the 60-month row reproduces the default exactly, which is the check that the table and the calculator agree.
| Term | Annuity factor | Loan amount | Total of payments | Total interest |
|---|---|---|---|---|
| 36 months | 31.9118 | $14,360.31 | $16,200.00 | $1,839.69 |
| 48 months | 40.9619 | $18,432.86 | $21,600.00 | $3,167.14 |
| 60 months | 49.3184 | $22,193.30 | $27,000.00 | $4,806.70 |
| 72 months | 57.0345 | $25,665.53 | $32,400.00 | $6,734.47 |
Stretching from 36 to 72 months nearly doubles the interest, from $1,839.69 to $6,734.47, while raising the loan the payment can carry by less than 80 percent, from $14,360.31 to $25,665.53. The reason is that later payments are worth less in present-value terms, because they have had longer to accumulate interest, so each additional year of term buys less loan than the year before it, at a higher interest cost. The practical consequence is the upside-down trap: cars depreciate fastest in their first years, while a long loan pays down slowest in its first years, so a 72-month loan on a new car can leave the buyer owing more than the car is worth for most of the loan’s life. A buyer who must sell or replace the car during that period pays the difference out of pocket. Shorter terms cost more per month and less in total, and they build equity faster; longer terms do the reverse, and the table prices exactly how much reverse they do.
Down payment leverage, and the rate you actually get
The down payment is the only input that raises the price you can afford without raising the interest bill by a cent, because interest is charged on the loan pile only, as the results panel explains. Hold the default loan fixed at $22,193.30, from a $450 payment at 8 percent over 60 months, and vary only the down payment: with no down payment the price is $22,193.30 itself; with the default $5,000 down it is $27,193.30; with $10,000 down it is $32,193.30. In every case the 60 payments total $27,000 and the interest totals $4,806.70, because the loan never changed. Shifting money from the loan pile into the down-payment pile, by saving longer or by buying cheaper, cuts the interest bill on every remaining payment, and it is the cheapest money in the whole transaction, because it is the only money that costs nothing to borrow.
The rate is the input buyers control least and should check most, because it is set by credit history and by the lender, not by the buyer, and a higher rate shrinks the affordable price even when the payment stays the same. At the default’s $450 payment over 60 months, 8 percent gives a loan of $22,193.30, while 12 percent gives an annuity factor of 44.9550 and a loan of $20,229.77, which is $1,963.53 less car for the same monthly payment, with interest rising from $4,806.70 to $6,770.23. The difference between those two rates is the difference a credit score can make, and it is worth more than most negotiations over the sticker price: $1,963 of price and $1,963 of interest, in opposite directions, from a rate change the buyer may be able to improve by waiting, by paying down other debts, or by shopping the loan among lenders before shopping the car. Enter the rate you were actually offered, not the advertised rate, and if you hold pre-approval from more than one lender, run the calculator once per offer; the cheapest loan is the one with the lowest total cost for the same car, not the lowest payment.
What the calculator leaves out, on purpose
The price this page produces is the highest sticker price the budget can carry, and it is not the whole cost of owning the car. The results panel already warns that fuel, servicing, tires and the odd repair run to another $150 to $300 a month on an everyday car, and those costs come from the rest of the budget, not from the car budget this page computes. Registration, annual taxes where they apply, and any dealer fees beyond the sticker price are also outside the calculation, as is the cost of the insurance increase that a financed car requires, since a lender will require full cover where an owned car might carry less. A buyer who spends the whole computed price and then discovers the running costs has bought a car they cannot afford to run, which is a different failure from buying a car they cannot afford to pay for, and no less real.
Depreciation is the other omission, and it is the largest cost of all for a new car, even though it never appears in a monthly payment. A car that loses a large share of its value in its first years costs its owner that loss whether it is sold or not, and the loss is steepest exactly where long loans leave the buyer upside down. The calculator does not model depreciation because it varies by make, model, mileage and market in ways no single figure can capture, but a buyer comparing a new car against a nearly new one should compare the computed price against the expected resale value at the end of the loan, not just against the monthly payment. The discipline the page enforces is narrow: given a budget, an insurance figure, a down payment, a rate and a term, it tells you the price. Everything else about the purchase, the running costs, the resale value and the risk of the term, is a judgment the buyer must make with the price in hand, not instead of it.
Salary to car budget: three worked salaries
The income mode on this page works from a share of income, and the share is easier to judge with salaries attached. The 10 percent line in the 20/4/10 rule is a share of gross monthly income, covering the whole car budget: payment plus insurance together. The table below works that line through four salaries, then subtracts an example insurance figure of $150 a month to show what is left for the loan payment itself. The insurance figure is an example input, not an average: your own figure replaces it, and the payment column moves dollar for dollar with it.
| Annual gross salary | Monthly gross | 10% all-in budget | Payment left after $150 insurance |
|---|---|---|---|
| $60,000 | $5,000 | $500 | $350 |
| $80,000 | $6,667 | $667 | $517 |
| $100,000 | $8,333 | $833 | $683 |
| $120,000 | $10,000 | $1,000 | $850 |
Two cautions belong with the table. First, gross income overstates the money available in the month, which is why this page also offers a take-home mode and a 15 percent line for take-home pay: on $5,000 a month of take-home pay the 15 percent line is $750 all-in, more generous than the $500 gross line at the same salary, because the two percentages are measured on different incomes. Second, a salary-based budget is a ceiling, not a target. A household with heavy rent, childcare or debt payments can find even the strict line uncomfortable, and the right response is to lower the share, not to argue with the rule. The calculator enforces whichever share you choose; choosing the share is the judgment it cannot make for you.
How much car does a monthly payment buy? The $200 to $500 ladder
Most buyers shop from the payment, not from the salary: they know what the month can carry and want the price that goes with it. The ladder below answers that question at one stated set of example terms, an APR of 6 percent over 60 months with no down payment, so that the relationship between payment and price is visible without pretending the terms are yours. At those terms each dollar of monthly payment buys about $51.73 of car, and a down payment adds to the price dollar for dollar at the same payment.
| Monthly payment | Car price at the example terms |
|---|---|
| $200 | $10,345 |
| $300 | $15,518 |
| $400 | $20,690 |
| $500 | $25,863 |
The ladder moves when the terms move, and the direction is worth knowing before negotiating. A longer term raises the price the same payment buys, but the extra years are paid for in interest, and the car spends more of its life worth less than the balance owed on it. A higher APR lowers the price the same payment buys, which is why a payment quoted without a rate and a term is not a price at all. At the same example terms, a $30,000 car costs about $580 a month. Run your own rate, your own term and your own down payment through the calculator above, and treat any ladder built on someone else’s terms as an illustration of the method, not as a quote.
Frequently asked questions
How much car can I afford on my income?
A widely used ceiling is 15% of your monthly take-home pay for the whole car budget — payment and insurance together. The stricter 20/4/10 rule uses 10% of gross income for those same costs. On $5,000 a month take-home, the 15% line is $750 all-in, which is roughly a $450 to $550 payment once insurance takes its share. Use the income mode above and try both percentages; if the 10% answer feels painfully small, that is the rule telling you something worth hearing.
What is the 20/4/10 rule for buying a car?
Three guardrails in one: put at least 20% down, borrow for no more than 4 years (48 months), and keep your total monthly car costs — loan payment plus insurance — at or under 10% of your gross monthly income. The down payment stops you owing more than the car is worth, the short term keeps the interest bill honest, and the 10% cap keeps the car from crowding out everything else in your budget.
Why does the calculator subtract insurance before working out the loan?
Because insurance is a real, non-negotiable monthly cost of the same car, and on a financed vehicle you will usually be required to carry comprehensive cover, which costs more than basic liability alone. If the loan payment alone eats your whole car budget, the insurance still has to be paid — out of money you had planned for something else. Taking it off the top means the price you get already lives inside a budget that includes it.
Does a longer loan term make a car more affordable?
It makes the monthly payment smaller, which is not the same thing. At 8% APR, $450 a month borrows $22,193.30 over 60 months and about $28,871 over 84 months — but the interest grows from $4,806.70 to about $8,928. The car also ages while you pay, and long loans pay down slowly, so you can owe more than the car is worth for years. A longer term buys a bigger car with money that mostly goes to the bank.
How much should I put down on a car?
The 20/4/10 rule says at least 20% of the price, and the arithmetic backs it up: every dollar of down payment is a dollar you do not borrow, do not pay interest on, and do not owe against a car that is losing value. On the example on this page, raising the down payment from $5,000 to $7,000 does not change the monthly payment at all — it drops the price ceiling by nothing and the loan by the full $2,000, saving about $433 in interest over 60 months at 8% APR. If 20% is out of reach, a smaller car plus a few more months of saving usually beats a bigger car bought today.
What does this calculator leave out?
Everything the car costs after you buy it: fuel, servicing, tires, brakes, repairs and parking, plus the one-off sales tax, title and registration fees at purchase. Allow roughly another $150 to $300 a month for running costs on an everyday car, more for larger or older ones. This page deliberately keeps those out of the loan maths — they are not borrowed — but they belong in your real budget, which is why the honest answer is usually to shop a little below the number it gives you.
Is a longer loan ever the right choice?
Sometimes, but the price is stated in the term table in the guide above, and it should be paid knowingly. A longer term lowers the monthly payment, which can be the difference between affording reliable transport and not, and a buyer with stable income, a large down payment and a car that holds its value may carry a longer term without ever going upside down. What a longer term always does is raise the total interest, slow the build-up of equity, and extend the period during which the car may be worth less than the loan. The right question is not whether the payment fits, but whether the total cost and the upside-down risk are worth the lower payment, and whether the running costs of $150 to $300 a month still fit alongside it.
What counts in the 10 percent of the 20/4/10 rule?
Total car costs, not just the loan payment. The 10 percent in the rule covers the payment, the insurance, and the running costs, fuel, servicing, tires and repairs, together, against gross income. This page’s budget field is the payment plus insurance only, so a budget that looks rule-compliant here can still break the rule once running costs are added: the default $600 budget is already 12 percent of $5,000 of take-home income before a dollar of fuel. Apply the rule by adding your realistic running costs to the budget this page computes, and comparing that total with 10 percent of your income, rather than by comparing the page’s budget alone.
Should I use gross or take-home income?
The 20/4/10 rule is traditionally stated against gross income, but this page’s income field is labelled take-home income, and the distinction matters for the answer. Take-home pay is smaller than gross pay, so a budget that is 10 percent of take-home pay is stricter, and safer, than 10 percent of gross pay. The consistent approach is to enter the income figure you actually receive each month, as the field asks, and to judge the result against your real monthly cash flow, including the running costs the page does not compute. A budget built on gross income that never reaches your bank account is a budget built on money you cannot spend.
What if my credit means a higher APR?
Enter the rate you were actually offered and let the price fall where it falls. At the default’s $450 payment over 60 months, 8 percent gives a loan of $22,193.30, while 12 percent gives $20,229.77, which is $1,963.53 less car for the same monthly payment, with total interest rising from $4,806.70 to $6,770.23. That gap is often worth more than negotiating the sticker price, and it is sometimes worth waiting for: paying down other debts, correcting credit report errors, or shopping the loan among lenders before shopping the car can move the rate by more than any haggling over the car itself. Never enter an advertised rate you have not been offered; the calculator is only as honest as its inputs.
How much car can I afford on a $60,000 salary?
On the strict 20/4/10 rule, 10 percent of gross monthly income covers the whole car budget, payment plus insurance. At $60,000 a year that is $500 a month all-in, which leaves about $350 a month for the loan payment after an example $150 of insurance. Your own insurance figure replaces the example, and the payment moves dollar for dollar with it. Households with heavy rent or debt should treat the strict line as a ceiling and consider a lower share.
What monthly payment buys a $30,000 car?
It depends on the rate and the term, not on the price alone. At an example APR of 6 percent over 60 months with no down payment, a $30,000 car costs about $580 a month. A longer term lowers the payment and raises the total interest, a higher APR raises the payment, and a down payment lowers it. Enter your own rate, term and down payment above for the figure that applies to you.
Does a bigger down payment change the car I can afford, or just the loan?
Both, in the same direction. At a fixed monthly payment, every extra dollar of down payment raises the price you can carry by a dollar, because the loan only has to cover the price minus the down payment. The down payment also shortens the time the balance exceeds the car’s value. It does not change the monthly budget itself, which is set by income and the share you choose.
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