Florida mortgage qualifying ratios calculator, 2026 exam math.
Practice loan amount, PITI, front-end ratio, back-end ratio, max housing payment, and qualifying income. The goal is not lender approval. The goal is clean Florida exam setup.
Mortgage qualifying math usually asks you to compare housing payment to income or housing plus debt to income. Keep monthly numbers with monthly numbers, and do not leave taxes or insurance out of the housing payment when the question includes them. Use the qualifying limits the stem gives you.
Subtract the down payment from purchase price before calculating payment.
Build the monthly housing payment from principal, interest, taxes, insurance, and HOA only if the stem includes it.
The front-end ratio compares housing payment to gross monthly income.
The back-end ratio includes housing plus recurring monthly debt.
Treat 28/36 as a practice default only. Actual loan products and lenders use different limits.
Residential Mortgages includes Types of Mortgage Loans, Qualifying the Buyer, and Math-Finance.
DBPR also lists Real Estate Related Computations and Closing of Transactions as an exam area.
CFPB defines debt-to-income as monthly debt payments divided by gross monthly income.
CFPB notes that different loan products and lenders can use different DTI limits.
Solve qualifying ratios in the same order every time.
Mortgage math gets easier when you keep the setup separate from the arithmetic: find the loan amount, build housing payment, then compare front-end and back-end ratios against the stem.
Find the loan amount. Subtract the down payment from purchase price. If the exam stem gives the loan amount, use the stem's number.
Build monthly housing payment. Add principal and interest, monthly taxes, insurance, and HOA only when the stem includes those items as housing expense.
Calculate the front-end ratio. Divide monthly housing payment by gross monthly income. Keep other monthly debts out of this ratio.
Calculate the back-end ratio. Add housing payment plus recurring monthly debt, then divide by gross monthly income.
Compare against the stem. Use the ratio limits the question gives. Do not treat the calculator's 28/36 defaults as a Florida rule or an approval promise.
Estimate payment, LTV, and qualifying ratios.
Exam note: Florida exam stems usually give principal and interest or a payment factor. This calculator estimates P&I from rate and term so you can practice the ratio setup.
Qualifying ratios use the housing payment, not just principal and interest. Taxes, insurance, and HOA matter when the stem includes them.
The back-end ratio includes housing plus other monthly debt. The front-end ratio uses housing only.
A 28 percent ratio is 0.28 in the calculation. Use the ratio limits given in the stem.
A buyer can pass the front-end ratio and still fail the back-end ratio if car payments, credit cards, student loans, or other debt push the total too high.
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What this mortgage calculator is built to answer
Use it for Florida exam questions involving purchase price, down payment, loan amount, monthly housing payment, qualifying ratios, and gross monthly income. It shows each layer so the ratio setup does not get lost.
Why qualifying ratio questions get missed
Students often mix annual and monthly numbers, or they use principal and interest when the question is asking for the full monthly housing payment. The arithmetic is manageable. The category choice is the test.
Three mortgage patterns to know.
$400,000 price with 20 percent down
Do not use the purchase price as the loan amount after a down payment is given.
$2,576 housing payment and $9,200 gross monthly income
Front-end uses housing payment only.
$2,576 housing payment, $625 debt, $9,200 income
Back-end includes other recurring monthly debt.
Four mortgage qualifying questions to solve by setup.
These original Florida-style questions test front-end ratio, back-end ratio, PITI setup, and the lower-number-controls trap.
A buyer has a $2,520 monthly housing payment and $9,000 gross monthly income. What is the front-end qualifying ratio?
Front-end ratio uses housing only. $2,520 divided by $9,000 equals 0.28, or 28 percent.
A buyer has a $2,520 monthly housing payment, $720 in other monthly debt, and $9,000 gross monthly income. What is the back-end ratio?
Back-end ratio uses housing plus other debt. ($2,520 + $720) divided by $9,000 equals 36 percent.
Principal and interest is $1,950. Annual taxes are $4,800, monthly insurance is $170, and monthly HOA is $80. What monthly housing payment should be used if HOA is included?
Convert taxes to monthly: $4,800 divided by 12 is $400. Then add $1,950 + $400 + $170 + $80.
A buyer earns $8,500 gross monthly income. The front-end limit is 28 percent, the back-end limit is 36 percent, and the buyer has $900 in other monthly debt. What maximum housing payment qualifies under both limits?
Front-end allows $8,500 x 0.28, or $2,380. Back-end allows total debt of $8,500 x 0.36, or $3,060. Subtract $900 other debt, leaving $2,160 for housing. The lower number controls.
The math is usually simple. The category is the trap.
Using principal and interest only
Mortgage qualifying questions often want the full housing payment. Taxes, insurance, and HOA dues can change the ratio.
Using annual income with monthly debt
Keep the time period consistent. Monthly payment belongs with monthly income.
Forgetting the back-end ratio
A buyer can look fine on housing alone and still be over the total-debt ratio.
What to review next.
Mortgage qualifying math sits beside LTV, lending vocabulary, mixed closing math, and the larger Florida math formula set.
What is official, and what is practice setup.
This page keeps public-source exam scope separate from editable practice assumptions. That makes the calculator useful for Florida exam prep without implying real-world loan approval.
Florida exam scope was checked against the current DBPR Sales Associate Candidate Information Booklet and DBPR Examination Information page.
DBPR lists Residential Mortgages at 9 percent and includes Qualifying the Buyer plus Math-Finance in that outline.
Debt-to-income wording was checked against CFPB consumer guidance, which defines DTI as monthly debt payments divided by gross monthly income.
The calculator uses 28/36 only as editable practice defaults. Real loan products and lenders can use different limits.
Principal-and-interest payment is estimated for practice. When an exam stem gives P&I or a payment factor, use the stem's number.
Practice questions are original Pass Florida examples written to test PITI setup, front-end ratio, back-end ratio, and max housing logic. They are not copied exam questions.
Frequently asked questions about mortgage qualifying ratios.
Short answers for Florida exam candidates studying PITI, front-end ratio, back-end ratio, required income, and debt-to-income traps.
How do you calculate a mortgage payment for exam math?+
The exam may give a payment factor, a table, or enough information to estimate payment. For qualifying questions, remember that the housing payment can include principal, interest, taxes, insurance, and HOA dues.
What is the front-end qualifying ratio?+
The front-end ratio is the housing payment divided by gross monthly income. It measures how much income goes to housing before other debts are included.
What is the back-end qualifying ratio?+
The back-end ratio is housing payment plus recurring monthly debt divided by gross monthly income. It is usually the stricter number when the buyer has other debt.
Are 28/36 ratios a Florida rule?+
No. The 28/36 pair is a common practice default for learning the math pattern. Florida's exam can give the qualifying limits inside the question, and real loan programs or lenders can use different debt-to-income limits.
Does PITI include HOA dues?+
Only include HOA dues when the question treats HOA as part of monthly housing expense. PITI strictly means principal, interest, taxes, and insurance, but qualifying-payment stems may add HOA or other housing charges.
How do you find required monthly income from a ratio?+
Work backward. For a front-end test, divide the housing payment by the front-end limit. For a back-end test, divide housing plus other debt by the back-end limit. If both ratios are tested, the higher required income controls.
Is this calculator a lender approval tool?+
No. It is a study calculator for Florida real estate exam math. Actual mortgage approvals depend on lender guidelines, credit, assets, loan type, underwriting, and current rules.