Your Debt-to-Income (DTI) ratio is the percentage of your gross monthly income that goes toward paying debts. Lenders use it to determine if you can afford a mortgage payment on top of your existing obligations. If your DTI is too high (typically over 43-50%), you will be denied, regardless of your credit score. This guide provides a 90-day plan to slash your DTI.
Understanding the Math: Front-End vs. Back-End
Lenders look at two DTI numbers. The 'Front-End' ratio is your projected housing payment (PITI: Principal, Interest, Taxes, Insurance) divided by your gross income. The 'Back-End' ratio is your projected housing payment PLUS all other monthly debt payments (car loans, student loans, minimum credit card payments) divided by your gross income. The Back-End ratio is the critical hurdle.
Back-End DTI Formula
(Proposed Housing Payment + Total Monthly Debt Payments) / Gross Monthly Income = DTI %Where:
Proposed Housing Payment=Estimated Principal, Interest, Taxes, Insurance, and HOATotal Monthly Debt Payments=Minimum payments on credit cards, auto loans, student loans, personal loansGross Monthly Income=Your income before taxes and deductionsExample
($2,000 housing + $500 car + $200 student loans) / $6,000 gross income = 45% DTI
The 90-Day Sprint: Strategies to Lower DTI
You have two levers to pull: decrease debt or increase income. In a 90-day window, decreasing debt is usually the faster, more controllable lever.
90-Day DTI Reduction Checklist
- ○Pay off small balance credit cards entirely to eliminate the minimum payment from the calculation.
- ○Do not close the credit cards after paying them off (this hurts your credit score).
- ○Refinance an auto loan to a longer term to lower the monthly payment (only if necessary to qualify).
- ○Consolidate high-interest debt into a lower-payment personal loan (consult a loan officer first).
- ○Document any consistent side-hustle or overtime income (requires a 2-year history to count).