Are you about to apply for a mortgage or loan and want to know if your profile qualifies? This debt-to-income ratio (DTI) calculator tells you immediately. It is the indicator every bank and lender uses to decide whether to grant you credit: it measures how much of your monthly income is already committed to repaying debts. By entering income, housing payment, other debts and any new payment, it calculates the front-end and back-end DTI, the DTI with the new loan, total debt and your remaining borrowing capacity. It is the right tool to understand your real chances before applying.

What the debt-to-income ratio is

The debt-to-income ratio (DTI) is the percentage of gross monthly income that goes to debt payments. It is calculated by dividing monthly debt payments by monthly income and multiplying by one hundred. A 40% DTI means that 40 cents of every euro earned are already committed. It is the most immediate measure of your financial health and the first number a lender looks at: the lower it is, the more reliable you are considered and the more able to sustain a new payment.

Why it matters for credit

Banks and lenders use DTI to estimate the risk of a loan. A high DTI signals you are already very exposed and that a new payment could strain you; a low DTI indicates room and repayment ability. For mortgages, many markets have precise thresholds: exceeding the lender's limit can mean a rejected application or worse terms. Knowing your DTI in advance lets you present yourself prepared and know how much you can realistically request.

How the calculator works

Enter five values: monthly income, the housing payment (mortgage or rent), other monthly debts, any new payment you are considering and the lender's DTI limit. The calculator returns the front-end DTI (housing only) and back-end (all debts), the DTI considering the new loan, total monthly debt and how much room you have left before hitting the limit. Change the values to simulate different debt scenarios.

The values you need

Monthly income is your gross monthly earnings (lenders generally use gross). The housing payment is the monthly mortgage or rent. Other debts are personal loans, car loans, instalments, minimum credit card payments. The new payment is that of the loan you would like to obtain, to see the impact. The DTI limit is the lender's maximum threshold (often 43% for mortgages); leave it at the default if you do not know it.

Front-end and back-end DTI

There are two versions of DTI. The front-end (or housing ratio) considers only the housing cost relative to income: it indicates how much the home weighs on your budget. The back-end includes all debts (housing plus loans, cards, instalments): it is the most important figure for lenders, because it captures the entire debt burden. Generally a front-end under 28% and a back-end under 36% are recommended, though many mortgages are granted up to 43%.

What counts as monthly debt

Not all expenses count in DTI: only debt payments count, not running costs. Here is what to include and what not:

Enter into the calculator only recurring debt payments: including living expenses would inflate the DTI and distort the lender's assessment.

DTI thresholds

Lenders interpret the back-end DTI according to fairly standard bands:

43% is a very common reference threshold for mortgage eligibility. Staying under 36% gives you the most room and the best terms.

DTI with a new loan

The calculator also shows the DTI you would have adding the new payment you are considering. It is the decisive number when you request a loan: the lender does not look only at your current situation, but at the one resulting after granting the new credit. If the DTI with the new loan exceeds the limit, the application risks rejection. Simulating different payments helps you understand the maximum sustainable amount even before approaching the bank.

Remaining borrowing capacity

The remaining capacity indicates how much additional monthly debt you can sustain before reaching the lender's DTI limit. It is obtained by multiplying income by the limit and subtracting the debts already present (and the new payment, if entered). It is a practical and powerful figure: it tells you in euros how much new monthly payment you can still afford. If it is zero, you have already saturated your capacity and a new loan is unlikely without first reducing existing debts.

DTI and mortgage approval

For mortgages, DTI is often the decisive factor, together with the credit score and the down payment. Many institutions apply the 43% limit on the back-end, but the most conservative mortgages require 36% or less. A low DTI can also get you a better rate, because you reduce the risk for the bank. If your DTI is high, consider reducing debts or increasing the down payment before applying: even a few percentage points can make the difference between approval and rejection.

Front-end and back-end compared

The two indicators answer different questions:

Lenders assess both, but the back-end carries the most weight in the final decision, because it considers the entire exposure.

Gross or net DTI

Most lenders calculate DTI on gross income, before taxes, and that is the value to enter here to compare with their thresholds. However, for your personal budget, it can be useful to calculate it on net income too: it gives a more realistic picture of what actually remains. If you want a prudent assessment of your sustainability, try entering the net: the DTI will be higher, but closer to the reality of your bank account.

How to improve your DTI

You have two levers: reduce debts or increase income. Paying off the smaller debts, consolidating loans to lower the monthly payment, avoiding new financing before applying for a mortgage and increasing earnings (even with documentable side income) improve the ratio. Note: closing a credit card does not reduce DTI if you had no payments in progress. Focus on actual monthly payments: that is what the lender measures.

Common mistakes

• Including running expenses (food, utilities) in DTI that are not debts.
• Using net income when the lender requires gross.
• Forgetting minimum credit card payments.
• Looking only at the front-end and ignoring the back-end, which is more decisive.
• Requesting a new loan without simulating the resulting DTI.

How to use the calculator

Enter income, housing payment and other debts to immediately get your front-end and back-end DTI. Add the payment of the loan you are considering to see the resulting DTI and the remaining capacity. Try different scenarios: what happens if you pay off a loan? If you increase income? By comparing the results you understand where to act to stay within the limits and maximise your chances of obtaining credit on good terms.

Practical example

You have a monthly income of €3,000, a housing payment of €800, other debts of €400 a month, no new payment, and a 43% limit. The result: a front-end DTI of 26.7%, a back-end DTI of 40%, a total debt of €1,200 and a remaining capacity of €90 a month, with a "good: eligible for credit" verdict. If you considered a new €300-a-month loan, the DTI would rise to 50% and the remaining capacity would drop to zero. Enter your numbers for your real situation.

Frequently asked questions

What is the debt-to-income ratio (DTI)?

It is the percentage of gross monthly income that goes to debt payments. It is calculated by dividing monthly debt payments by income and multiplying by one hundred. It is the key indicator lenders use to assess credit.

What is the difference between front-end and back-end DTI?

The front-end considers only the housing payment relative to income; the back-end includes all debts (housing plus loans, cards, instalments). Lenders look mostly at the back-end, because it captures the entire debt burden.

What is a good DTI?

Generally a back-end under 36% is excellent, up to 43% is still eligible for most mortgages. Above 43% credit becomes difficult, above 50% it is over-indebtedness.

What counts as debt in the DTI?

Debt payments count: mortgage or rent, personal and car loans, instalments, minimum card payments. Running costs like food, utilities, insurance and savings do not count.

Is DTI calculated on gross or net income?

Lenders almost always use gross income, before taxes: enter that to compare with their thresholds. For your personal budget you can also try net, getting a more prudent DTI.

What is the DTI limit for a mortgage?

A very common threshold is 43% on the back-end, but the most conservative mortgages require 36% or less. The exact limit depends on the lender, the product and the market: enter it in the dedicated field.

What is remaining borrowing capacity?

It is how much additional monthly debt you can sustain before reaching the DTI limit. It is obtained by multiplying income by the limit and subtracting existing debts. It tells you in euros how much new payment you can still afford.

How does paying off a debt improve DTI?

By eliminating a monthly payment you reduce total debts and therefore the back-end DTI. It is one of the most effective strategies before applying for a mortgage: even a few percentage points can change the outcome.

Does DTI consider the new loan I want?

Yes, the calculator also shows the DTI with the new payment: it is the number the lender really assesses, because what counts is your situation after obtaining the credit, not only the current one.

Does closing a credit card reduce DTI?

Not necessarily: DTI considers monthly payments, not available credit. If you had no payments in progress on that card, closing it does not change the DTI. What counts is reducing actual payments.

Is DTI the only criterion for a mortgage?

No: lenders also assess the credit score, the down payment, income stability and the property value. DTI is, however, one of the most important factors and often the first filter.

Does it also apply to renters rather than mortgage holders?

Yes, rent is included in the calculation as the housing cost, exactly like a mortgage payment. Enter it in the housing payment field to get your front-end and back-end DTI.

Does the calculator replace the bank's assessment?

No, it is an estimation and planning tool. The bank applies its own criteria and considers other factors. Use it to understand your position in advance and how much you can realistically request.

Does it work for any currency?

Yes, the calculation is universal and uses the values in your currency. DTI is a percentage, independent of currency; only the currency symbol of the amounts changes.

Updated July 2026