Loan To Income Calculator

Calculator inputs

Currency

Used for display only.

Primary income

Gross income before deductions.

Primary income frequency

Choose how the amount is entered.

Other recurring income

Bonuses, rent, side work, etc.

Other income frequency

Use annual for yearly bonuses.

Co-borrower income (optional)

Only include stable, verifiable income.

Co-borrower income frequency

Match the co-borrower amount type.

Existing monthly debts

Cards, loans, support, leases, etc.

Requested loan amount

Purchase price financed portion (approx).

Down payment

Cash paid upfront, reducing principal.

Interest rate (APR %)

Used for amortized payment estimate.

Term (years)

Longer terms reduce payment, increase total interest.

Origination fee type

Fee charged by some lenders.

Origination fee value

Example: 1.0 for 1% or a fixed amount.

Other closing costs

Appraisal, processing, legal, etc.

Include fees in loan?

If yes, principal increases and payment rises.

Annual property tax (optional)

Used for monthly housing payment estimate.

Annual home insurance (optional)

Include hazard insurance if applicable.

Monthly HOA (optional)

Common in apartments and gated communities.

Estimated income tax rate (%)

For net income estimate only.

Target total DTI (%)

Used to estimate an affordable max loan size.

Target LTI (multiple)

Example: 4.0 means 4× annual income.

After submitting, results appear above this form.

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Example data table

These sample scenarios show how income, debts, and rates can shift key ratios.

Scenario	Gross Monthly Income	Existing Debts	Financed Principal	APR	Term	Approx LTI	Approx DTI
Starter buyer	$5,200	$450	$165,000	7.00%	30y	2.64	31%
Move-up home	$8,750	$1,150	$360,000	6.50%	30y	3.43	38%
Higher leverage	$6,100	$900	$420,000	8.00%	25y	5.74	47%

Tip: keep inputs consistent (gross vs net). Ratios are usually based on gross income.

Formula used

Loan-to-Income (LTI) = Financed Loan Principal ÷ Annual Gross Income.
Total Debt-to-Income (DTI) = (Housing Payment + Existing Debts) ÷ Gross Monthly Income.
Housing DTI = Housing Payment ÷ Gross Monthly Income.
Monthly P&I payment uses amortization: P = r·L / (1 − (1+r)⁻ⁿ).
Affordable principal estimate solves PV from a target payment using the same rate and term.

Where L is principal, r is monthly rate (APR/12), and n is number of months.

How to use this calculator

Enter your gross income amounts and their frequencies.
Add all existing monthly debts you must pay reliably.
Provide loan amount, down payment, rate, and term.
Optionally include taxes, insurance, HOA, and fees.
Press Calculate to view results above the form.
Use Download CSV or Download PDF to save outputs.

Planning note: if your DTI looks high, reduce the loan amount, extend the term, increase down payment, or pay down existing debts.

Why Loan-to-Income Matters

Loan-to-income (LTI) compares financed principal to annual gross income. Many planners flag 3.0× as comfortable, 4.5× as stretched, and 6.0× as high leverage. If annual income is 72,000 and principal is 288,000, LTI equals 4.0, meaning the loan is four years of gross earnings.

Interpreting Debt-to-Income Bands

Debt-to-income (DTI) measures monthly obligations against gross monthly income. If gross income is 6,500 and total debt payments are 2,145, DTI is 33.0%. A conservative planning band is below 28%, a common mid band is 28–36%, and a caution band is 43% and above. Housing-only DTI is also useful: many budgets aim for 25%–31% of gross. Track the same payment against your net income estimate to see breathing room for savings, repairs, and rate resets. And keep emergency fund of three months.

Rate Sensitivity and Term Tradeoffs

Small rate moves change payments quickly. On a 240,000 principal over 360 months, payment is about 1,439 at 6.0% APR and about 1,597 at 7.0% APR, a difference near 158 monthly. Shortening term from 30 to 20 years raises payment but reduces total interest, which can lower long-run cost.

Fees and Housing Costs Influence

Origination fees, closing costs, property tax, insurance, and HOA can materially change affordability. A 1% origination fee adds 2,400 on a 240,000 principal. If financed, it increases principal and interest. Add annual taxes of 2,400 and insurance of 1,200, and housing costs rise by 300 monthly before HOA.

Using Targets to Stress-Test Scenarios

Targets convert ratios into a maximum payment and an estimated maximum principal. With gross income of 6,500 and a 36% target DTI, total debt budget is 2,340 monthly. After 650 existing debts, housing budget is 1,690. Subtract 300 for taxes and insurance, leaving 1,390 for principal and interest, which can be translated into an estimated principal at your chosen rate and term.

FAQs

How do I calculate loan-to-income?

Divide your financed principal by annual gross income. For example, 240,000 ÷ 60,000 = 4.0. Lower values generally indicate more borrowing room.

What payments should be included in DTI?

Include required monthly obligations: loan payment, taxes, insurance, HOA, and all recurring debts such as cards, student loans, car loans, and support payments.

Should I include co-borrower income?

Only include stable and verifiable co-borrower income. If it can’t be documented consistently, exclude it and run a conservative scenario.

Do fees change the ratios?

Yes. If fees are financed, principal rises and so does payment, which can increase both LTI and DTI. Paying fees upfront reduces financed principal.

How does an interest rate change affect affordability?

Higher rates increase the principal-and-interest payment. Even a 1% change can move payments noticeably, which can shift DTI bands and reduce your estimated maximum principal.

Which metric matters more: LTI or DTI?

Both matter. LTI caps the loan size relative to earnings, while DTI tests monthly cash flow. When they disagree, the tighter limit usually drives a safer borrowing level.